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1
Content available Analysis of Mechanical Properties of External Unilateral Fixation Device in the Case of Torque Load
Pervan Nedim, Muminović Adis J., Delić Muamer, Muratović Enis
Advances in Science and Technology. Research Journal
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2023
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Vol. 17, no 3
31--39
EN
Analysis of mechanical properties of external unilateral fixation device „Ultra X“, in the case of torque load, is presented in this paper. Fixation device is applied on lower leg in the case of unstable fracture. Computer aided design (CAD) model and finite element model (FEM) are developed according to the dimensions and material properties of real fixation device. In the next step principal stress and deformation analysis is performed in CATIA V5 software. During numerical analysis values of stresses at critical places are monitored and analyzed. In addition, values of displacements are measured on important places on fixation device and bone fracture. Using values of displacements at the place of bone fracture, stiffness of the fracture is calculated. The same methodology is used to calculate stiffness of the fixation device. Using obtained results, several conclusions about the mechanical properties of the fixation device “Ultra X” are formulated at the end of the paper.
2
Content available Stiffness Analysis of the External Fixation System at Axial Pressure Load
Pervan Nedim, Mešić Elmedin, Muminović Adis J., Delić Muamer, Muratović Enis
Advances in Science and Technology. Research Journal
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2022
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Vol. 16, no 3
226--233
EN
The paper analyzes the stiffness of the Orthofix external fixation system at axial pressure load, applied to the lower leg in case of an unstable fracture. Based on the actual construction of the Orthofix fixator, its 3D model was formed, and then a structural analysis was performed in the CATIA V5 software system. The aim of this paper is to investigate the mechanical properties of Orthofix fixator. FEM analysis of the fixator revealed displacements at characteristic points of the structure and fractures. During the FEM analysis, it is possible to change the load values, all with the aim of obtaining the best possible information about the behavior of the fixator during installation and use by the patient. Based on the results obtained from the FEM analysis, it can be concluded that the Orthofix fixative shows very good stiffness, but also that it can be improved by using newer materials, such as composite or some alloys of titanium and aluminum.
3
Content available remote Analysis of Mechanical Stability for External Fixation Device in the Case of Anterior-Posterior Bending
Pervan Nedim, Muminović Adis J., Mešić Elmedin, Delić Muamer, Muratović Enis
Advances in Science and Technology. Research Journal
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2022
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Vol. 16, no 3
136--142
EN
Analysis of mechanical stability for external fixation device Orthofix in the case of anterior-posterior bending is carried out in this paper. Device is applied to the lower leg for the case of unstable fracture. Real device is measured and 3D CAD model is developed. CAD model is used for numerical structural stress analysis which is carried out using CATIA V5 software. Results for displacements are obtained for selected critical places on the device and for the place of fracture. In addition, values of principal and von Misses stresses are obtained and analyzed. Using obtained results, conclusions about mechanical stability of device are formulated.
4
Content available Modelling of bolts in multi-bolted connections using Midas NFX
Grzejda R.
Technical Sciences / University of Warmia and Mazury in Olsztyn
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2015
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nr 18(1)
61--68
EN
In the paper a fragment of research on development of modelling methods of asymmetrical multi-bolted flange connections is presented. The effect of the bolt modelling method in a single bolted joint on both the stiffness characteristics of elements joined in the multi-bolted flange connection and bold forces have been examined. An analysis of the multi-bolted flange connection is carried out for selected models created using the finite element method (FEM). Guidelines for the selection of the bolt modelling method in the case of both the stiffness analysis and the load analysis of multi-bolted flange connections have been pointed out.
5
Analiza sztywności modelu klatki piersiowej kurzej
Gzik-Zroska B., Wolański W.
Modelowanie Inżynierskie
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2015
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T. 25, nr 56
34--39
PL
W artykule przedstawiono metodykę modelowania klatki piersiowej kurzej. W procesie modelowania zastosowano metodę elementów skończonych (MES). Model MES klatki piersiowej kurzej umożliwił wyznaczenie sztywności układu oraz symulację procesu pośredniego masażu serca. Przeprowadzone symulacje numeryczne dostarczyły informacji o stanie obciążenia klatki podczas zabiegu resuscytacji krążeniowo-oddechowej. Uzyskane informacje wskazują, że sztywność modelu klatki piersiowej kurzej jest zbliżona do sztywności klatki piersiowej prawidłowej.
EN
The article presents the methodology for funnel chest modelling. In the process the finite element method (FEM) was used. The FEM model of funnel chest enabled determination of the system stiffness and the simulation of indirect heart massage. Conducted numerical simulations provided information about the state of load of the chest during frame during cardio-respiratory resuscitation treatment. Obtained information shows that the stiffness of funnel chest model is similar to the stiffness of correct chest.
6
Content available Stiffness analysis of multi-chain parallel robotic systems with loading
Pashkevich A., Klimchik A., Chablat D., Wenger P.
Journal of Automation Mobile Robotics and Intelligent Systems
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2009
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Vol. 3, No. 3
75-82
EN
The paper presents a new stiffness modelling method for multi-chain parallel robotic manipulators with flexible links and compliant actuating joints. In contrast to other works, the method involves a FEA-based link stiffness evaluation and employs a new solution strategy of the kinetostatic equations, which allows computing the stiffness matrix for singular postures and to take into account influence of the external forces. The advantages of the developed technique are confirmed by application examples, which deal with stiffness analysis of a parallel manipulator of the Orthoglide family.
7
Content available remote Wspomagane komputerowo projektowanie elementów maszyn z materiałów hiperelastycznych
Osiński J., Żach P.
Górnictwo Odkrywkowe
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2008
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R. 49/2, nr 4-5
102-103
PL
Przedstawiono sposoby wykorzystania systemów obliczeń Metodą Elementów Skończonych do oceny sztywnościowo-wytrzymałościowej elementów maszyn wykonanych z materiałów o właściwościach hiperelastycznych. Najlepiej teoria tego rodzaju materiałów jest wprowadzona do systemów: ANSYS i ABAQUS.
EN
The reports presents methods of using FINITE ELEMNT METHOD to strength and stiffness analysis of machine's elements made from hiperelastic materials - theory of hiperelastic materials is the best used in systems: ANSYS and ABAQUS.
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