Wyniki wyszukiwania - BazTech

1

Dynamic numerical stress analysis of a crankshaft of internal combustion engine

Cieślar Kacper, Nowakowski Jacek, Knefel Tomasz

Zeszyty Naukowe. Transport / Politechnika Śląska

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2025

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z. 127

23--37

EN

Dynamic numerical stress analysis of a crankshaft subjected to load at selected operational points of a diesel engine is presented in this paper. The calculations and the analyses were carried out for six values of engine rotational speed and for two temperature values of engine structural elements. At each operating point of the engine, the piston-crank system was loaded with maximal gas pressure force, and additionally, inertia forces resulting from rotational speed of the crankshaft were taken into consideration. The analysis was carried out to obtain the distribution of the stress and to indicate critical areas where concentration of the stress may occur. In addition, the analysis was extended to other operational factors, such as the determination of the natural frequency of vibrations and effects of maximal torque on torsion of the crankshaft.

2

Torsional mode shapes of FGM shafts with various cross section

Kumor Mateusz

Technical Transactions

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2025

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Vol. 122, iss. 1

art. no. e2025003

EN

In this study, the torsional mode shapes of circular and non-circular functionally graded material shafts, focusing on triangular, rectangular, circular cross-sections are investigated. The shafts are composed of an aluminum-titanium (AlTi) alloy and various functionally graded materials, utilizing different mixing rules to create a gradient surface. The modal analysis is conducted using ANSYS Mechanical leading finite element analysis software to assess and visualize the vibrational characteristics of these shafts under torsional loading. Then, the same shafts made of isotropic material (pure Al) is prepared, and compared with respect to results. The objective is to understand the influence of FGMs compared to homogeneous and isotropic materials on the torsional behavior of shafts with non-circular geometries. By comparing the torsional mode shapes and frequencies, one can identify the distinct vibrational properties introduced by the gradient material composition. This comparison is highlight the potential advantages of FGM shafts in applications requiring tailored mechanical properties that traditional homogeneous materials cannot provide. The study also explores how the different cross-sectional shapes affect the torsional response, which is crucial for designing components subjected to twisting loads in aerospace, automotive, and construction industries. The results from ANSYS Mechanical are analyzed to extract the mode shapes and frequencies of torsional modes, providing a comprehensive understanding of how FG materials behave relative to isotropic counterparts under similar conditions. The study aims to show how the natural frequency and torsional mode shapes differ for a functionally graded material compared to isotropic material, may be useful for researchers working with applications where vibration behavior is crucial.

3

Numerical investigation for bending behavior of hybrid core composite sandwich structure

Abdulimam Marwah, Hamzah Ahmed, Hasan Ali

System Safety : Human - Technical Facility - Environment

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2025

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Vol. 7, iss. 1

396--405

EN

This study provides a numerical study of the bending behaviour of hybrid-core composite sandwich panels being modeled using finite element method (FEM) using the software ANSYS Workbench 17 R1. This work emphasizes the use of core materials with well-defined mechanical response mechanisms to achieve optimum structural behavior as a way to advance the stiffness-to-weight efficiency and potency of the material for various high-performance engineering applications. The four sandwich core configurations that were modeled and analyzed under the same three-point bending condition were: (i) a conventional PVC foam core, (ii) a carbon/epoxy corrugated core, (iii) a hybrid corrugated core filled with polyurethane (PU) foam, and (iv) a hybrid corrugated core filled with PVC foam. Numerical findings showcased that the hybrid design with PVC foam gave the best mechanical behavior characterized by moderate equivalent stress (≈258 MPa), balanced elastic strain (≈0.022 mm/mm) and least total deformation (≈0.485 mm). Higher mechanical compatibility between the PVC foam and the corrugated composite structure was apparent, therefore, enabling effective stress transfer and stabilizing deformation behaviors. In contrast, the mismatched stiffness of the components in the PU-filled hybrid core resulted in significant strain and base instability, while the carbon-corrugated and neat PVC foam designs exhibited either localized high stresses or an undesirable brittle failure behavior. As viewed from a materials engineering perspective, the results presented here demonstrate that performance in terms of structural stability and durability of sandwich composites is critically dependent on core/textile morphology and material characteristics. The corrugated + PVC foam hybrid provides a good balance between rigidity, toughness, and lightweight properties and is ideal for aerospace, marine, and structural pieces where strength-to-weight is critical, and flexural energy absorption is required.

4

Analiza MES właściwości kabla nadprzewodnikowego

Przybylski Karol, Głogowski Marek

Przegląd Elektrotechniczny

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2025

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R. 101, nr 12

33--41

PL

W pracy przeanalizowano właściwości elektromagnetyczne kabla nadprzewodnikowego wykonanego z materiału YBCO, wykorzystując symulacje numeryczne metodą elementów skończonych prowadzone w programach ANSYS Maxwell i COMSOL Multiphysics. Opisane badania obejmowały wpływ zewnętrznego pola magnetycznego oraz natężenia prądu na stabilność warunków pracy kabla nadprzewodnikowego. Przeprowadzono porównanie wyników badań uzyskanych w obu środowiskach obliczeniowych, wskazując na wysoką zgodność metodologii prowadzonych analiz oraz otrzymanych rezultatów.

EN

In this study the electromagnetic properties of a YBCO-based superconducting cable were analyzed using numerical finite element method simulations in ANSYS Maxwell and COMSOL Multiphysics. The research examined the influence of external magnetic field and electric current on the stability of the operating conditions of the superconducting cable. A comparative analysis of the results obtained from both simulation programs was carried out, revealing a high degree of consistency in the methodologies used and in the received outcomes.

5

Obliczenia nośności spawanego węzła rurowego z wykorzystaniem formuł analitycznych i MES

Zwoliński Tadeusz

Przegląd Budowlany

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2025

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R. 96, nr 5

179--182

PL

Celem pracy jest analiza nośności węzła z kształtowników zamkniętych w złożonym stanie obciążenia. Projektowanie takich węzłów z cienkościennych prętów klasy czwartej utrudnia brak zweryfikowanych eksperymentalnie formuł analitycznych, dostępnych jedynie dla profili krępych. Problem ten można obejść, stosując metodę zredukowanej granicy plastyczności (MZGP), polegającą na obniżeniu granicy plastyczności tak, by spełnić kryteria profilu klasy drugiej. Obliczenia wykonano dla węzła z profili SHS 300×200 i RHS 200×200 ze stali S355, zmieniając grubość ścianek. Wyniki analityczne porównano z analizą numeryczną MES (GMNIA) w programie ANSYS Workbench. Stwierdzono, że metoda MZGP daje bezpieczne, choć często zbyt konserwatywne oszacowania nośności. Wykazano również, że węzły z profili krępych mają większą zdolność do odkształceń.

EN

The aim of this study is to analyze the load-bearing capacity of a joint made of hollow sections under a complex loading condition. The design of such joints using thin-walled class four members is challenging due to the lack of experimentally verified analytical formulas, which are available only for stocky profiles. This problem can be addressed by applying the Reduced Yield Strength Method (RYSM), which involves lowering the yield strength to meet the criteria for a class two cross-section. Calculations were carried out for a joint made of SHS 300×200 and RHS 200×200 sections fabricated from S355 steel, with wall thickness as a variable parameter. Analytical results were compared with a numerical analysis based on the finite element method (FEM) using a full GMNIA (geometrically and materially nonlinear analysis with imperfections) in ANSYS Workbench. It was found that the RYSM provides safe, though often overly conservative, estimates of the joint’s load-bearing capacity. It was also demonstrated that joints made of stocky profiles exhibit a significantly higher deformation capacity.

6

Optimization analysis on the support performance of composed anchor rod components in gob-side roadway

Yu Jiang, Jin Linlin, Ma Hongfa, Zhang Jun, Wang Feng, He Xin, Yin Dawei

Mining Science

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2025

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Vol. 32

65--85

EN

In response to the failure problem of the roadway support structure for the deep buried mine, the mechanical calculation model was established based on the stress state and the boundary conditions of the composed anchor rod under the large surrounding rock deformation, and the failure discrimination criterion was obtained. Then a structural analysis unit for rock-composed anchor was established using ANSYS simulation software, which intensively researched the single-point and local failure characteristics of anchor rods in gob-side entries, and the optimization measures of the com-posed anchor rods were proposed. The findings reveal that the higher preload could restrain the axial displacement of the anchor rod, leading to stress concentration, fracture, or loosening of anchor bolts or nuts by the insufficient rock deformation. In addition, the stress concentration and plastic deformation of pallet orifice are significant as the main pressure-bearing part. The increase in the surrounding rock deformation leads to an enhanced combined action of pressure and shear force between the steel strip and the pallet edge, which makes the steel strip prone to failure. Consequently, the optimization measures of reducing prestress and increasing the size of pallet and strip are proposed, which can effectively control the deformation of surrounding rock and reduce the stress concentration, plastic deformation and failure rate of composed anchor rod.

7

Application of Geometrical and Material Nonlinear Analysis (GMNA) for evaluating the load-carrying capacity of compressed thin-walled steel members of class 4

Domżał Tomasz, Jeleniewicz Katarzyna

Inżynieria Bezpieczeństwa Obiektów Antropogenicznych

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2025

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Nr 2

39--54

EN

This article compares numerical and experimental results obtained for axially compressed class 4 cold formed steel sections. Simulations in ANSYS Workbench 2024 R2 were conducted as part of this study, using GMNA non-linear analysis and Multilinear Isotropic Hardening (MIH) material model. The sections under analysis were steel channels made of grade S350GD+Z steel, ranging in length from 0.4 m to 1.2 m at 0.2 m increments. The objective was to represent the actual behavior of compressed cold formed sections, including local buckling and distortion. The conclusions show the adequacy of the ANSYS workbench as an effective tool for studying class 4 cold formed members. Despite the limitations due to modelling simplifications, besides identification of deformation modes, FEM analysis also allows estimating the critical load values. The need for numerical model calibration based on the experimental results has been confirmed in this study. It is particularly important for more slender members, in which the effect of geometrical imperfections becomes particularly strong. The approach proposed in this article may be used both at the design stage and in subsequent experimental verification of designed steel structures.

8

Investigation of stress concentration factors in countersunk holes of biaxially loaded isotropic plates

Jabri Abdullach A., Gharaibeh Mohammad A.

International Journal of Applied Mechanics and Engineering

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2025

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Vol. 30, no. 1

79--88

EN

This study employs finite element analysis (FEA) and response surface methodology (RSM) to analyze the stress concentration factor (SCF) in a biaxially loaded isotropic plate with a central countersunk hole. A finite element model is built using ANSY and employed to generate stress concentration factor values. The finite element model was optimized in terms of mesh density and properties based on data from past literature. Five dimensionless parameters are studied: radius to width ratio, thickness to radius ratio, countersink to thickness ratio, σ_y to σ_x ratio and countersink angle. The effect of the different configurations was studied using RSM. Finally, a precise second order equation was produced to estimate the value of SCF with dimensionless parameters.

9

Integrating numerical simulation and experimental data for enhanced structural health monitoring of bridges

Singh Om Narayan, Dey Kaushik

Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska

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2025

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T. 15, nr 1

22--26

EN

The research described in this paper aims to enhance the structural health monitoring (SHM) of highway bridges by integrating numerical simulations with experimental data. A simply supported highway bridge is studied under traffic loads, and both numerical and experimental approaches were employed. The numerical model of the bridge was developed using ANSYS, while high-resolution experimental data were collected from velocity transducers placed at key points on the bridge. The experimental data were compared with the results from the numerical model for validation. The results showed that the natural frequencies obtained from both the experimental and numerical analyses were closely aligned, demonstrating the reliability of the model. The validated model was further used to predict long-term structural behaviours under different operational conditions, contributing to better maintenance planning and the sustainability of infrastructure. The study concludes that combining numerical simulations with experimental data improves the accuracy of SHM, enabling early detection of potential structural issues and extending the lifespan of bridges. Key findings emphasize the significant role of vehicle speed in influencing the dynamic response of the bridge, as well as the importance of considering material properties and vehicle loads in predicting structural health.

PL

Badania opisane w niniejszym artykule mają na celu poprawę monitorowania stanu konstrukcji (structural health monitoring – SHM) mostów na autostradach poprzez integrację symulacji numerycznych z danymi eksperymentalnymi. Prosto podparty most na autostradzie jest badany pod obciążeniem ruchem drogowym i zastosowano zarówno podejście numeryczne, jak i eksperymentalne. Model numeryczny mostu został opracowany przy użyciu programu ANSYS, podczas gdy dane eksperymentalne o wysokiej rozdzielczości zostały zebrane z przetworników prędkości umieszczonych w kluczowych punktach mostu. Dane eksperymentalne zostały porównane z wynikami modelu numerycznego w celu walidacji. Wyniki pokazały, że częstotliwości drgań własnych uzyskane zarówno z analiz eksperymentalnych, jak i numerycznych były ściśle dopasowane, co świadczy o niezawodności modelu. Zweryfikowany model został następnie wykorzystany do przewidywania długoterminowych zachowań strukturalnych w różnych warunkach operacyjnych, przyczyniając się do lepszego planowania konserwacji i zrównoważonego rozwoju infrastruktury. W badaniu stwierdzono, że połączenie symulacji numerycznych z danymi eksperymentalnymi poprawia dokładność SHM, umożliwiając wczesne wykrywanie potencjalnych problemów strukturalnych i wydłużając żywotność mostów. Kluczowe wyniki badań podkreślają istotną rolę prędkości pojazdu we wpływie na dynamiczną reakcję mostu, a także znaczenie uwzględnienia właściwości materiału i obciążeń pojazdu w przewidywaniu stanu konstrukcji.

10

Digital twin of Bystřička dam

Vymlátil Petr, Ekr Jan, Hodák Jiří, Mrózek Michal

Gospodarka Wodna

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2025

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Nr 9

28-32

EN

This paper presents a digital twin of the Bystřička dam, a major hydraulic structure. A digital twin is a virtual model of a real object, providing accurate information from measured and simulated data. The Bystřička dam twin combines real-time safety monitoring data with predictions from a finite element model created in ANSYS. Accessible via a web app, the digital twin enables real-time monitoring and remote control. This pioneering tool supports safety management and advances water engineering in the Czech Republic.

PL

Artykuł opisuje digital twin, tj. cyfrowego bliźniaka zapory Bystřička, jednej z większych budowli hydrotechnicznych. Cyfrowy bliźniak to wirtualny model rzeczywistego obiektu, dostarczający dokładnych informacji na podstawie danych zmierzonych i symulowanych. Cyfrowy bliźniak zapory Bystřička łączy w sobie monitorowanie danych bezpieczeństwa w czasie rzeczywistym oraz przewidywanie na podstawie modelu elementów skończonych utworzonego w ANSYS. Dostępny przez aplikację webową cyfrowy bliźniak umożliwia monitorowanie w czasie rzeczywistym i zdalne sterowanie. To pionierskie narzędzie wspiera zarządzanie bezpieczeństwem i stanowi istotny krok w rozwoju inżynierii wodnej w Republice Czeskiej.

11

Influences of Hardened Aluminium HMMC on Tribological, Flexural and Impact Strength of Wheel Rim Element with Prognostications

Kamatchisankaran S., Bovas Herbert Bejaxhin Alphonse, Ramkumar Kathalingam, Ramanan Nandagopan

Archives of Metallurgy and Materials

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2024

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Vol. 69, iss. 3

1015--1025

EN

The primary goal of this research is to develop hybrid non-ferrous material composites with high flexural and impact strengths by testing the mechanical, thermal, and corrosion properties of AA 6061 wheel rims with various silicon carbide (SiC) and zirconium sulphide (ZrSO4) compositions. This produces an alloy with high strength and perceptible hardenability that is used in a variety of marine space industries. Because of its exceptional strength-to-density ratio, it is a highly sought-after metal matrix composite in the automobile industry. This innovative composite material offers lower weight and higher impact strength when compared to the current wheel rim alloy. Designs of experiments based recommendations and results of simulations in order to prolong the life of the wheel rim.

12

Microstructure, Mechanical Properties, and Heat Distribution ANSYS model of CP Copper and 316 Stainless Steel Torch Brazing

Abtan Auday Awad, Mohammed Mohammed S., Alshalal Iqbal

Advances in Science and Technology. Research Journal

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2024

|

Vol. 18, no. 1

167--183

EN

Using torch brazing techniques, 316 stainless steel was brazed to CP copper using flux-coated low silver content filler with 20% Ag. The brazing torch utilized a fuel mixture of propane gas with oxygen to produce the required heating amount due to the possibility of economic interest in employing low-silver-content filler. The brazing filler's braze ability with SUS304 and copper was scrutinized and deeply analyzed. A ferrite barrier layer was made on the stainless-steel side, and an excellent brazed joint was produced. Metallurgical studies using an optical microscope and a scanning electron microscope (SEM) confirmed the production of a ferrite layer. This layer's advantages were carefully examined with metallurgical testing, electron diffraction scanning (EDS), EDS mapping, and EDS line analyses, including preventing copper intergranular penetration into the stainless-steel grain boundary. The mechanical properties of the brazed joint and its usability were assessed through Vickers microhardness and tensile tests on the brazing seam and both base metals. The results of the brazing process showed that using flux-coated low-silver brazing techniques produced strong joints with satisfactory mechanical properties. These techniques are a cost-effective alternative to high-priced brazing fillers with high silver content. Geometrical models simulated the heat distribution using ANSYS and SOLIDWORKS software to analyze penetration depth, joint quality, surface cracks, and the relation between molten filler density variation and the wetting process.

13

Numerical analysis of propagation of femur crack due to osteoporotic changes

Kuryło Piotr, Zaborowska K., Czarnecki P., Pruszyński P.

Journal of Achievements in Materials and Manufacturing Engineering

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2023

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Vol. 121, nr 2

320--326

EN

The aim of the research was to analyse the possibilities of a model description of the type of bone fracture, the state of stress and strain, the method of fix and load, and the physical properties of bone tissue in relation to the method of loading the hip joint in individual phases of physical activity. Design/methodology/approach Analysis of the phenomenon of bone fracture with the use of the finite element method (FEM), which allows to observe the phenomenon of bone fracture affected by osteoporosis, taking into consideration bone disease foci. Modelling of femoral fracture propagation at different periosteal densities was performed. Findings Differences in the method of fracture of the femoral neck are presented, showing different boundaries of bone discontinuity depending on the point of fracture initiation and the force required for its propagation. Research limitations/implications Reproduction of the diseased bone may be limited by the accuracy of its digital model and the physically limited density of the FEM mesh. Using model tests allows us to understand the phenomenon of osteoporotic bone fracture and predict the effects of fracture, which will allow for faster implementation of an effective treatment method. Practical implications The use of the FEM method for analysis allows obtaining knowledge about the formation of bone discontinuities after fracture. It also allows for predicting the place of its occurrence and selecting the appropriate treatment method. Originality/value There was a significant difference in the shape of the femoral neck fracture depending on the place of its initiation. The effectiveness of the FEM analysis in predicting the location, shape and type of fracture is presented.

14

Numerical investigation on the vibration reduction of rotating shaft using different groove shapes of tilt bearing

Abbood Ahmed Imad, Abdulla Fadhel Abbas

Diagnostyka

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2023

|

Vol. 24, No. 3

art. no. 2023304

EN

Vibration control is very important for high-speed rotors. Oil film damping is considered an effective vibration-damping method, especially for long shafts in gas turbines, ships, and other high-speed rotating equipment. The existing groove in the internal surface of the tilt bearing increases the amount of oil that flows through the bearing; this is more effective in suppressing the vibration of the rotor system carried by the plain bearing. In order to suppress the vibration of the rotor system, which is supported by sliding bearings, a different groove-shaped oil flow (GSOF) is studied and analysed in this paper. A different shape of grooves in bearings was set up and measured to study the vibration-damping effect of the flow oil shape with GSOF. ANSYS software presents significant benefits to engage Fluent for oil flow with Transient structural for vibration measurements. This paper uses these terms to perform the simulation numerically to explore the groove-shaped damper's damping effect under the rotor system. The study identified three enhancements of vibration and settling time. First, the circular groove showed a 35.71% reduction in amplitude and 10% increase in stilling time; the next one is the circular groove which reduced the amplitude by 42.85% and the settling time by 0%. The third modification was the inclined groove which reduced the amplitude by 42.85% and the settling time by 12%. The last one was the triple-inclined groove, which reduced the amplitude and settling time by 57.14% and 20%, respectively.

15

Impact of TIG Welding Parameters on the Mechanical Properties of 6061-T6 Aluminum Alloy Joints

Kareem Salah Sabeeh Abed Al, Mahdi Basma Luay, Hussein Hiba K.

Advances in Science and Technology. Research Journal

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2023

|

Vol. 17, no. 5

114--129

EN

The most common gas-shielded arc welding method is tungsten inert gas welding, which uses shielding gas to isolate the welded area. Such technique is mostly used in the industrial domain, including steel framework fabrication and installation, plumbing systems, and other building jobs. The welding method and the implementation of a suitable welding joint based on some factors that contribute to the fusion process were studied in the present research. The research investigated the specifications and efficiency of the area to be welded in terms of the thermal effect on the welding joint shape and some significant mechanical property-related factors which that were determined during the welding process. In this paper, aluminum alloy sheets, AA 6061-T6, with a thickness of 3 mm, were used with a 60mm width and 80mm length. These sheets were prepared to be welded using welding currents of 90A, 95A, and 100A, welding speeds of 60mm/min, 80 mm/min, and100 mm/min, and gas flow rates of 8 l/min, 9 l/min, and 10 l/min. The experiments were designed at three distinct levels. These levels were selected to create the L9 orthogonal array. Regression analysis, signal-to-noise ratio evaluation, and analysis of variance were carried out. The created model has enhanced accuracy by predicting the reinforced hardness found in the weld specimens, according to the regression study, which showed R2= 90.09%. In addition, it was discovered that the ideal welding parameters for a welded specimen were 100 A for welding current, 80 mm/min for welding speed, and 9 l/min for gas flow. The present research examined the shape of the thermal distribution of welded parts using the engineering computer program ANSYS. The experimental results clarified the proposed approach, as they showed that the welding current is the most influential factor in the hardness of the weld using the fusion process of 90.95%, followed by the welding speed of 7.48%, while the gas flow rate of 1.52% has the least effect. The authors recommend using qualified welders to ensure optimal performance. It is anticipated that these findings will serve as a foundation for analysis to optimize welding processes and reduce welding defects.

16

Problemy dotyczące modelowania obciążenia wiatrem obiektów budowlanych

Skotniczny Krystyna, Kopernik Magdalena, Rawska-Skotniczny Anna

Materiały Budowlane

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2022

|

nr 6

63--65

PL

Im bardziej skomplikowany kształt obiektu budowlanego, tym trudniej prognozować, jak będą na niego oddziaływały masy powietrza podczas przepływu. Problem jest istotny z uwagi na niezawodność obiektów budowlanych. Analizy numeryczne oraz badania doświadczalne pozwolą w przyszłości zmodyfikować wytyczne normowe, przyczyniając się do poprawy bezpieczeństwa obiektów budowlanych.

EN

The more complex the shape of a building object, the more difficult it is to predict how air masses will affect it during flow. The problem is important for the reliability of buildings. Numerical analyses and experimental studies will allow future modification of the standard guidelines, contributing to the improvement of the safety of buildings.

17

Diagnostics of stress and strained state of leaf springs of special purpose off-road vehicles

Bazhanova Anastasiia, Nemchuk Oleksii, Lymarenko Oleksandr, Piterska Varvara, Sherstiuk Olha, Khamrai Vadym

Diagnostyka

|

2022

|

Vol. 23, No. 1

art. no. 2022111

EN

The work is devoted to the diagnostics of the stress state of systems that soften the shock load on the vehicle body, the elastic element of the car suspension such as a multi-leaf spring. The construction of a mathematical model taking into account the geometric nonlinearity according to the finite element method theory is considered. Mathematical modelling was carried out to take into account the change in the stiffness matrix of the system when changing its shape. For research, a symmetrical semi-elliptical spring consisting of five leaves is used. All numerous numerical experiments were performed in two computer-aided design (CAD) systems: ANSYS, a heavy multipurpose package and SolidWorks, a middle-level multipurpose package. Computeraided design algorithms have been developed to expand the capabilities of CAD. The analysis of the results obtained allows to conclude that the traditional models of nonlinearity in ANSYS and SolidWorks give approximately the same results, which at the maximum point differ by 20.6% from the data of a full-scale experiment. When using the proposed model, this difference is reduced to 7.95%.

18

Investigation of glass fiber influence on mechanical characteristics of natural fiber reinforced poliester composites : an experimental and numerical approach

Mohapatra Deepak Kumar, Deo Chitta Ranjan, Mishra Punyapriya

Composites Theory and Practice

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2022

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R. 22, nr 3

123--129

EN

In the past few decades, natural fiber reinforced polymeric composites have gained significant importance for various structural applications in different sectors like the automotive, aerospace, sports and building construction industries. However, hybridizations make the composite more versatile in term of strength, weight and its processing for many engineering applications. In the current study, a polyester resin matrix was reinforced with two different natural fibers, namely kenaf and palmyra palm leaf stalk (PPLS) and hybridized with glass fiber. Four layers of two different fiber mats, kenaf/glass and PPLS/glass with different stacking sequences were employed to fabricated laminates by the hand lay-up technique. In this case, an attempt was made using the numerical approach to investigate the influence of glass fiber on the mechanical characteristics of the laminates. To substantiate the results of the numerical approach, experiments were conducted. Enhancement of both the tensile and flexural strength was observed due to hybridization of both the kenaf and PPLS fiber with glass fiber. The tensile and flexural strength improved by 68.91 and 37.63% respectively when the kenaf fiber was hybridized with glass fiber. Similarly, enhancement of 54.42% of the tensile strength and 15.92% of the flexural strength were noticed when the PPLS fiber was hybridized with glass fiber. Through the use of ANSYS software, finite element analysis (FEA) was employed as a simulation method to examine the tensile and flexural strength. The numerical findings were found to be quite close to the experimental results, with a variation of less than 3%.

19

Study the internal cracks effect on vibration of laminated composite square plates

Hassan M.S., Rashid Z.H., Sarhan R.A.

Archives of Materials Science and Engineering

|

2022

|

Vol. 116, nr 1

28--33

EN

Purpose: The study of cracks behaviour in a composite plate is of significant importance in the dynamics of the Mechanical parts in order to avoid design failures due to resonance or high amplitude vibrations. Design/methodology/approach: In this paper, a square glass-epoxy composite plate is adopted. The plate has four layers with symmetric and asymmetric lamination. Assuming the cracks are profound as defects. The results were obtained by using a numerical solution of mechanical APDL from ANSYS. Findings: It has been found for different boundary conditions that the rank of natural frequencies is decreased by increasing the crack ratio due to the reduction of the plate’s stiffness, whereas the crack direction has no mentioned effect for a small angle of rotation. Research limitations/implications: The accuracy of results is verified by comparing a single case of the current work with other previous investigations. value: Evaluate the influence of the crack length ratio, angle of the crack rotation, boundary conditions and lamination angles on the natural frequencies of the square composite plate with glass-epoxy materials.

20

Electrode Mass Loading Effects on Different Piezoelectric Substrates for Saw Delay Lines: A Comparative FEM Analysis

George Sheeja P., Isaac Johney, Philip Jakob

Archives of Acoustics

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2022

|

Vol. 47, No. 1

89--95

EN

Several modelling techniques are currently available to analyse the efficiency of inter-digital transducers (IDTs) fabricated on piezoelectric substrates for producing surface acoustic wave (SAW) devices. Impulse response method, equivalent circuit method, coupling of modes, transmission matrix method, and numerical techniques are some of the popular ones for this. Numerical techniques permit modelling to be carried out with any number of finger electrode pairs with required boundary conditions on any material of interest. In this work, we describe numerical modelling of SAW devices using ANSYS to analyse the effect of mass loading, a major secondary effect of IDTs on the performance of SAW devices. The electrode thickness of the IDT influences the resonance frequency of the SAW delay line. The analysis has been carried out for different electrode materials, aluminium, copper, and gold, for different substrate materials, barium titanate (BaTiO3), X-Y lithium niobate (LiNbO3), lithium tantalate (LiTaO3), and the naturally available quartz. The results are presented and discussed.