Study of Unipolar and Bipolar Hip Prostheses Using Finite Element Simulation: Contact Stress Analysis

2017 ◽  
Vol 739 ◽  
pp. 96-102 ◽  
Author(s):  
Eko Saputra ◽  
Iwan Budiwan Anwar ◽  
Rifky Ismail ◽  
J. Jamari ◽  
Emile van der Heide
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Contact Interaction ◽  
Contact Stress ◽  
Analytical Method ◽  
Hip Prosthesis ◽  
Hip Prostheses ◽  
Element Simulation ◽  
Liner Surface ◽  
Maximum Contact

One of phenomena which cannot be avoided in the hip prosthesis due to sliding contact as a product of human activity is wear on the surface of contact interaction Wear in the bipolar model is more complicated than the unipolar model. There are two contact interaction in the bipolar model, while the unipolar model has only one contact interaction. Wear on the liner and cup surfaces of the bipolar model itself can be early estimated by investigation the contact stresses due to their contact interactions. The contact stress on the liner surface of unipolar model can be estimated using analytical method. However, the estimation of contact stress on the liner and cup surface of the bipolar model using analytical method still need to consider. The aiming of this paper is to study the contact stresses on the liner and cup surfaces in the bipolar model of hip prosthesis using the finite element simulation. There are three model of hip prostheses which are simulated in this research, i.e. the unipolar, bipolar and big head unipolar models. The result showed that the maximum contact stress on the liner surface of bipolar model is higher than the unipolar model. The maximum contact stress on the cup surface of the bipolar model is lower than the big head unipolar model. Based on this results, it can be concluded that the contact stress on the liner and cup surfaces of the bipolar model cannot be estimated using analytical method.

scholarly journals Two-dimensional finite element simulation of fracture and fatigue behaviours of alumina microstructures for hip prosthesis

2011 ◽  
Vol 225 (12) ◽  
pp. 1158-1168 ◽  
Author(s):  
K Kim ◽  
B Forest ◽  
J Geringer
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Contact Stress ◽  
Hip Prosthesis ◽  
Scale Effects ◽  
Crack Density ◽  
Contact Stresses ◽  
Two Dimensional ◽  
Acetabular Cup ◽  
Element Simulation

This paper describes a two-dimensional (2D) finite element simulation for fracture and fatigue behaviours of pure alumina microstructures such as those found at hip prostheses. Finite element models are developed using actual Al2O3 microstructures and a bilinear cohesive zone law. Simulation conditions are similar to those found at a slip zone in a dry contact between a femoral head and an acetabular cup of hip prosthesis. Contact stresses are imposed to generate cracks in the models. Magnitudes of imposed stresses are higher than those found at the microscopic scale. Effects of microstructures and contact stresses are investigated in terms of crack formation. In addition, fatigue behaviour of the microstructure is determined by performing simulations under cyclic loading conditions. It is shown that crack density observed in a microstructure increases with increasing magnitude of applied contact stress. Moreover, crack density increases linearly with respect to the number of fatigue cycles within a given contact stress range. Meanwhile, as applied contact stress increases, number of cycles to failure decreases gradually. Finally, this proposed finite element simulation offers an effective method for identifying fracture and fatigue behaviours of a microstructure provided that microstructure images are available.

P-67: An Analytical Method of Small-Sized Module Waving Based on the Finite-Element Simulation

2017 ◽  
Vol 48 (1) ◽  
pp. 1494-1497 ◽  
Author(s):  
Bingchuan Zhang ◽  
Yingbo Zheng ◽  
Yanfeng Lin ◽  
Gege Zhou ◽  
Chengling Lv
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Analytical Method ◽  
Element Simulation

P‐59: An Analytical Method of Small Size Module Waving based on the Finite Element Simulation

2020 ◽  
Vol 51 (1) ◽  
pp. 1562-1564
Author(s):  
Xiaohua Li ◽  
Bingchuan Zhang ◽  
Lei Zhu ◽  
Qing Guo ◽  
Wei Zhou
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Analytical Method ◽  
Element Simulation

scholarly journals Analysis of Tooth Surface Contact Stress of Involute Spur Gear

2021 ◽  
Vol 2133 (1) ◽  
pp. 012037
Author(s):  
Yusheng Zhai ◽  
Jie Mu ◽  
Ruiguang Yun ◽  
Siran Jia ◽  
Jianfeng En ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Contact Stress ◽  
Simulation Analysis ◽  
Spur Gear ◽  
Tooth Surface ◽  
Analysis Model ◽  
Element Analysis ◽  
Element Simulation ◽  
Surface Contact

Abstract Through the establishment of a pair of spur gear contact models, based on Hertz contact theory, the tooth surface contact stress is calculated; then the Ansys finite element analysis software is used to simulate and analyse the stress distribution. Through the analysis and comparison of the two results, it is proved that the contact stress calculated by Hertz theory is relatively small, which is close to the results of the finite element simulation analysis. Theoretical calculation can verify the accuracy of the finite element simulation analysis model, and the finite element simulation analysis provides an effective way to accurately calculate the contact stress of the tooth surface.

scholarly journals Reducing Contact Stress of the Surface by Modifying Different Hardness of Femoral Head and Cup in Hip Prosthesis

2021 ◽  
Vol 7 ◽  
Author(s):  
Eko Saputra ◽  
Iwan Budiwan Anwar ◽  
J. Jamari ◽  
Emile van der Heide
Keyword(s):  
Femoral Head ◽  
Contact Stress ◽  
Hip Prosthesis ◽  
Hip Prostheses ◽  
Wear Process ◽  
Element Simulation ◽  
Static Contact ◽  
Surface Contact ◽  
The Difference ◽  
Wear Law

The wear of hip prosthesis due to applied load and sliding distance during the patient's daily activity cannot be avoided. Wear causes osteolysis or metallosis due to the wear debris produced by the wear process. Several methods were used to reduce wear in metal-on-metal hip prostheses. One of the efforts performed to reduce wear was the differential-hardness concept. Based on the literature, the fine surface roughness of the femoral head are the reason why the hip prosthesis with differential-hardness reduces wear. Besides, the differential-hardness will contribute to the difference of modulus elasticity then influenced the contact stress on the surface contact. According to Archard's wear law, wear on the material pair is affected by contact stress. Therefore, the analysis of contact stress on the hip prosthesis with differential-hardness is important to investigate. The investigation performed by the static contact of two-dimensional axisymmetric with frictionless by using finite element simulation. The simulated models are the alumina vs. alumina, alumina vs. SS316L, CoCr vs. CoCr, CoCr vs. SS316L, and SS316L vs. UHMWPE. The purpose of this study is to determine the contact stress on the surface contact due to differential-hardness of the femoral head and cup. The results of simulations show that the differential-hardness marked by differences in the modulus of elasticity can reduce the contact stress on the surface contact if compare with the similar hardness.

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