Wyniki wyszukiwania - BazTech

1

Inżynieria balustrad szklanych mocowanych punktowo w Australii: studium przypadku dotyczące projektowania i skuteczności konstrukcji. Część II

Malabanan Paul John

Świat Szkła

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2025

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R. 30, nr 7-8

8--14

2

Engineering of Point-Fixed Glass Balustrades in Australia: A Case Study on Design and Structural Performance

Malabanan Paul John

Świat Szkła

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2025

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R. 30, nr 5

3--14

3

Parametry techniczno‑użytkowe stolarki okienno‑drzwiowej w budynkach mieszkalnych

Kopyłow Ołeksij

Materiały Budowlane

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2025

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nr 8

236--237

4

Elewacje wentylowane z okładzinami ceramicznymi

Kopyłow Ołeksij

Materiały Budowlane

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2025

|

nr 9

228--231

5

Effect of study of composite materials under high-velocity impact

Hasan I.S., Ali M., Hussein E.Q.

Archives of Materials Science and Engineering

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2025

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Vol. 132, nr 2

49--58

EN

Purpose: The research investigates the design, fabrication, and experimental and theoretical testing of a hybrid composite material. The purpose of the research is to find the design and precise calibration of a custom-made projectile launcher, which ensures consistency in the impact tests. Design/methodology/approach: It can achieve these aims by calibration according to air pressure variation, checking the consistency in the velocity of the projectile, hence proving the reliability of the device for impact resistance measurements. Findings: Test results indicated that an increase in glass fibre percentage significantly improved the values of tensile strength and shock resistance for the tested samples, with the best performance attained for specimens containing a 60% fibre content. The addition of aluminium powder exhibited a moderate improvement in the material characteristics at impact absorption. This study proposed that the addition of carbon fibres or replacing aluminium powder with copper powder could further increase the resistance to impact. Research limitations/implications: It is suggested to carry out the study, which provides useful input into the development and optimisation of the hybrid composite materials, plus forms an extremely solid basis for studies that could be dedicated later to further improvement of the material performance in view of commercial applications. By combining practical testing with theoretical research using SolidWorks and ANSYS, it has been proven that hybrid materials work well in any application requiring high tensile strength and impact resistance. Originality/value: The effect of aluminium powder exhibited a moderate improvement of the material characteristics at impact absorption. It has again been proposed that the addition of carbon fibres or replacing aluminium powder with copper powder will further increase the resistance to impact. The results showed a significant increase in tensile strength and shock resistance, especially for samples affected by the glass fibre content, which improved the shock resistance grade of the material.

6

Evaluation of mechanical performance in polymer composites reinforced with particles and fibers

Ali Aenas Laith, Habeeb Diyar

Archives of Engineering Knowledge

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2025

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T. 11, Nr 1

13--19

EN

In this study, polymer-based hybrid composites were fabricated using the hand-casting technique, with unsaturated polyester resin serving as the core material. The composites were reinforced with a fixed volume fraction (15%) of glass fiber mat (GLASS-E). Two sets of samples were prepared: the first set was reinforced with graphite particles, while the second set used Kevlar mat fibers (50) as reinforcement instead of glass fibers. The effects of varying volume fractions (2%, 8%, 14%, 20%, and 26%) of graphite particles, with particle sizes ranging from 100 μm to 20 μm, on the mechanical properties of the composites were thoroughly investigated. Comprehensive mechanical tests including tensile, compression, impact, flexural, shear, and hardness tests - were conducted at room temperature to evaluate the material’s performance. The results revealed that increasing the volume fraction of graphite particles led to enhancements in tensile strength, compressive strength, tensile modulus, fracture toughness, and overall hardness. Additionally, flexural stiffness and shear stress values improved as the graphite content increased. Conversely, the compressive modulus showed an increase at lower graphite volume fractions but decreased at higher fractions in both groups. The impact resistance tests indicated that the hybrid composites reinforced with graphite particles and Kevlar fibers exhibited higher values of tensile strength, tensile modulus, compressive modulus, impact strength, and fracture toughness than those reinforced with glass fibers. However, the composites with glass fibers demonstrated superior compressive strength, stiffness, flexural strength, and shear stress compared to the Kevlar-reinforced composites.

7

Mechanical characterization and impact resistance of a novel hybrid composite based on salvadora persica roots and glass fibers

Chetouh S., Ameur T., Bouakba M., Gaagaia D. E., Khalfi M., Safi B.

International Journal of Applied Mechanics and Engineering

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2024

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Vol. 29, no. 2

39--51

EN

The observation of fibers in salvadora persica roots inspired us to consider the idea of using them as reinforcement to create an innovative composite. The current work focuses on the volumetric mass density, extraction, molding, and mechanical testing of composites and hybrid composites made from salvadora persica roots and glass fibers reinforced with two types of polyester matrix, chosen due their characteristics suitable for use in different orientations. Various extraction and combination methods have been used to identify an optimal approach for obtaining fibers from salvadora persica roots, considering its chemical composition (hemicellulose, pectin, and lignin). In this investigation, the hand lay-up method was used to mold specimens with different geometries. The composite and hybrid composite were combined with a polyester matrix and subjected to various mechanical tests namely; tensile, impact resistance, and water absorption. The results indicate that reinforcing polyester resins with SP fibers, whether long or short, enhances the overall mechanical properties of the composite. Additionally, improved adhesion between salvadora persica roots fibers and resin was observed.

8

Experimental study on SHPB cyclic impact of rubber-cement composite with different confine modes

Yang Rongzhou, Xu Ying, Chen Peiyuan, Cheng Lin, Ding Jinfu, Fu Hongxin

Archives of Civil Engineering

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2023

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Vol. 69, nr 2

517--534

EN

To promote the application of rubber-cement composites as the main bearing structure and key components in practical engineering under frequent dynamic disturbances, in this work, the split Hopkinson pressure bar (SHPB) cyclic impact tests of rubber-cement composite specimens with four different confine modes were carried out in which the impact load increased sequentially. The relationship between average strain rate, ultimate strain and impact times and the relationship between peak stress, damage energy, ultimate strain and incident energy were analyzed. The results showed that the appropriate confine reinforcement treatment can make rubber-cement composite give full play to its deformation ability when it was completely damaged. Carbon fiber-reinforced polymer (CFRP) sheet and steel cylinder can work together with the rubber-cement composite matrix to resist impact load, which effectively improves the structural strength, damage fracture energy, and cyclic impact resistance of the rubber-cement composite. Finally, based on the effect difference of confine modes, the simplified plane force models of rubber-cement composite specimens with four different confine modes were established, which clearly revealed the completely different impact resistance mechanism of the rubber-cement composites with different constraints under cyclic impact loading.

9

Static properties and impact resistance performance of U-shaped PU-modified concrete under repeated drop-weight impact load

Laqsum Saleh Ahmad, Zhu Han, Bo Zhao, Haruna S. I., Al-shawafi Ali, Borito Said Mirgan

Archives of Civil and Mechanical Engineering

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2023

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Vol. 23, no. 4

art. e227, s. 1-20

EN

This study investigated the impact strength of U-shaped polyurethane (PU)-modified concrete using repeated drop-weight impact tests. A U-shaped specimen was introduced in this study to modify the testing procedure of the ACI 544-2R committee for the drop-weight impact test aiming to minimize the scatter result of this testing method. The static characteristics and impact resistance of U-shaped PU-modified concrete were subjected to repeated weight drops of 0.877 kg. The effects of PU binder on the mechanical and impact strength performance were evaluated in four groups of PU-modified concrete containing 0%, 10%, 20%, and 30% prepared to produce normal concrete-polyurethane (NC-PU) specimens. Machine learning (ML) techniques, which include artificial neural network (ANN) and support vector regression (SVR), were employed to train and test the experimental dataset. The result showed that PU binders significantly decrease mechanical behavior and improve concrete impact strength. At the optimal content, flexural strength was increased by 3.6%, and the compressive strength of the control specimen (NC-PU0) was 49.17% higher than the concrete containing 20% PU (NC-PU2) specimen. The U-shaped specimens reduce the scatter result of repeated drop-weight impact test results suggested by the ACI 544-2R testing method. Adding 10% PU and 20% PU binder improved the first crack strength of NC-PU1, NC-PU2, and NC-PU3 by 685.71%, 1528.6%, and 157% compared to the NC-PU0 specimen. The machine learning techniques accurately predict the N2. ANN and SVR demonstrate a strong relationship between the experimental N2 and predicted N2 with determination correlation (R2) values of 0.9944 and 0.9981 at the training and testing phase, respectively.

10

Research on low-velocity impact resistance and damage characteristics of M-type GFRP foldcore sandwich structure

Yunfei Deng, Yuetong Wang

Archives of Civil and Mechanical Engineering

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2023

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Vol. 23, no. 3

art. no. e193, 2023

EN

The M-type GFRP foldcore was prepared by thermal pressing method and was bonded with the panel to obtain the complete foldcore sandwich structure. The influence of impact energy and impact position on the damage mode and impact dynamic response under the low-velocity impact of GFRP M-type foldcore sandwich structure is studied through experiment and numerical simulation. The results show that the impact position has a significant influence on the damage mode and impact resistance of the foldcore sandwich structure, mainly fracture damage at Base-impact while mainly tensile damage at Node-impact. The impact resistance of Node-impact is better than the Base-impact. The numerical simulation model can also predict the damage mode and the impact dynamic response well.

11

Uderzenie w taflę szkła i równowaga energetyczna pękania

Vanapalli Sagar, Reich Stefan

Świat Szkła

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2022

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R. 27, nr 12

40--45

12

Statistical Method to Evaluate the Process Capability Index of Laminated Glass Regarding Impact Resistance

Piroird Keyvan, Taccoen Nicolas, Villey Richard

Świat Szkła

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2022

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R. 27, nr 6

6--9

13

Włókna celulozowe w systemach ociepleń

Cholewa Grzegorz, Matysiak Marek

Materiały Budowlane

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2022

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nr 3

38--39

14

Influence of the resistance to concentrated mechanical loads on maintaining the water tightness of flexible sheets for roof waterproofing

Francke Barbara, Runkiewicz Leonard

Materiały Budowlane

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2022

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nr 9

50--52

EN

The article analyses the influence of concentrated mechanical loads on the durability of roofing materials as a function of roof waterproofing. The authors compared the influence of concentrated static, dynamic and hail loads on water tightness of coverings made of flexible roofing materials, i.e. bitumen sheet with reinforcement, PVC sheet and EPDM sheet. Mentioned materials were tested on concrete substrates and on the surface of mineral wool.

PL

W artykule przeanalizowano wpływ skupionych obciążeń mechanicznych na trwałość pokryć dachowych, określoną w funkcji wodoszczelności. Autorzy porównali wpływ skupionych obciążeń statycznych, dynamicznych i działanie gradu na wodoszczelność pokryć dachowych wykonywanych z wyrobów rolowych, tj. z papy, folii PVC i folii EPDM. Wspomniane wyroby badano na podłożach betonowych i z wełny mineralnej.

15

Na co zwracać uwagę przy wyborze okien i drzwi

Kopyłow Ołeksij

Inżynier Budownictwa

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2022

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nr 9

44--48

16

Influence of metallic grid and fiber reinforced concrete strengthening on the shielding and impact resistance of concrete walls

Yuan Tian‑Feng, Choi Jin‑Seok, Kim Young‑Hwi, Yoon Young‑Soo

Archives of Civil and Mechanical Engineering

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2022

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Vol. 22, no. 3

art. no. e109

EN

In modern society, an ever-increasing emphasis is placed on structural safety design that not only considers external loading but extends to reduced electromagnetic interference. Generally, studies only consider shielding effectiveness of strengthening method or materials, and few studies have considered the relationship between damaged areas and shielding effectiveness. Therefore, the influence of metallic grid parameters and fiber reinforced concrete (HSDC) on shielding effectiveness with and without impact loading are studied in this research. Concrete wall strengthening with four types of metallic grid and three thickness types of HSDC were considered. Moreover, the relationship between damaged area ratio and shielding effectiveness was evaluated utilizing the low-velocity drop-weight impact test. In specimens with metallic grid or HSDC, shielding effectiveness with strengthening layer (13.4-64.1%) or thickness (35.6-46.2%) increase and grid size (> 7.8%) decreased. Specimen strengthened by smaller than 55.1% and 101% of the free space area ratio of single and double layer, respectively, exhibit more than 40 dB shielding effectiveness. For the specimen strengthened with HSDC, shielding effectiveness increased with strengthening area, except smaller than 6%. The smallest metallic grid and the thickest HSDC strengthening specimen exhibited improved impact resistance and great shielding effectiveness after impact loading.

17

Jonoplast nowej generacji do ulepszonej laminacji

Schneider Jennifer

Świat Szkła

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2021

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R. 26, nr 11

48--50

18

Zestawy wyrobów do mocowania modułów fotowoltaicznych i kolektorów słonecznych w aspekcie wytrzymałości i bezpieczeństwa użytkowania

Frąckiewicz Piotr, Jakimowicz Marzena

Materiały Budowlane

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2021

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nr 7

41--44

19

Odporność na uderzenie ETICS z wełną mineralną i okładziną nieciągłą

Sudoł Ewa, Zamorowska Renata

Materiały Budowlane

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2021

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nr 9

12--14

PL

W artykule zaprezentowano wyniki badania odporności na uderzenie systemu ociepleń ETICS z wełną mineralną lamelową (TR80) oraz zwykłą (TR10). Okładzinę stanowiły płytki klinkierowe oraz płytki cięte z cegieł ceramicznych. Badania przeprowadzono po cyklach hydrotermicznych oraz zamrażania-rozmrażania. Zastosowano nowe podejście do badania odporności na uderzenie z użyciem ciał twardych i miękkich. Na podstawie uzyskanych wyników testowane rozwiązania sklasyfikowano w najwyższej I kategorii użytkowania. Nie zaobserwowano wpływu rodzaju materiału termoizolacyjnego ani rodzaju płytek okładzinowych na rozpatrywaną właściwość.

EN

The paper presents the results of the impact resistance tests of ETICS made with the use of lamella (TR80) and regular (TR10) mineral wool. The cladding was made of clinker tiles and tiles cut from ceramic bricks. The tests were carried out after hydro-thermal and freeze-thaw cycles. A new approach was used to test the impact resistance with the use of hard and soft bodies. Based on the results, the tested solutions were classified in the highest category I of use. No influence of the type of thermal insulation material or the type of cladding tiles on the considered property was observed.

20

Effect of rubber particles on impact resistance of concrete at a temperature of - 20 ℃

Yu Yong, Jin Zuquan, Zhu Han, Song Huamiao

Archives of Civil and Mechanical Engineering

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2021

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Vol. 21, no. 3

383--396

EN

Studies have shown that rubberised concrete is a potential pavement material. Pavement materials are generally expected to possess concrete with high impact resistance, especially in regions where winter temperatures remain lower than the freezing point for long periods. However, knowledge about the performance of rubberised concrete on impact under low temperatures is still limited. In this study, experiments were conducted to evaluate the compressive strength, elasticity modulus, bending strength, and impact resistance of rubberised concrete at room temperature (20 °C) and at a sub-zero temperature (− 20 °C). Meanwhile, a new U-shaped specimen drop-weight test was performed as an impact test. The results indicated that although the impact toughness of both rubberised and plain concrete types decreased at low temperatures, rubber particles also had positive effects on concrete impact resistance at − 20 °C. In addition to macroscopic tests, mercury injection and molecular dynamics simulations were performed to understand the mechanism through which rubber particles improve the impact resistance of concrete at low temperatures. The pores that could not freeze accounted for 1.55% of the total pores in plain concrete; this value was 2.36% in concrete with a rubber particle density of 50 kg/m3. From the results of this study, we can conclude that the addition of rubber can change the distribution of water or ice in concrete pores, which leads to an improvement in the toughness of concrete at a low temperature (- 20 °C).