scholarly journals The Effect of a Cementless Stem Cross-Sectional Shape on Mechanical Stability: A Finite Element Analysis approach

IARJSET ◽  
2015 ◽  
pp. 9-14
Author(s):  
Rahul Ribeiro ◽  
Beni Ram Rawal ◽  
Naresh Bhatnagar
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Mechanical Stability ◽  
Analysis Approach ◽  
Cementless Stem ◽  
Element Analysis ◽  
Cross Sectional ◽  
Sectional Shape

scholarly journals Buckling of Arteries With Noncircular Cross Sections: Theory and Finite Element Simulations

2021 ◽  
Vol 12 ◽  
Author(s):  
Yasamin Seddighi ◽  
Hai-Chao Han
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Blood Vessel ◽  
Cross Sections ◽  
Mechanical Stability ◽  
Theoretical Models ◽  
Homogeneous Material ◽  
Element Analysis ◽  
Cross Sectional ◽  
Buckling Behavior

The stability of blood vessels is essential for maintaining the normal arterial function, and loss of stability may result in blood vessel tortuosity. The previous theoretical models of artery buckling were developed for circular vessel models, but arteries often demonstrate geometric variations such as elliptic and eccentric cross-sections. The objective of this study was to establish the theoretical foundation for noncircular blood vessel bent (i.e., lateral) buckling and simulate the buckling behavior of arteries with elliptic and eccentric cross-sections using finite element analysis. A generalized buckling equation for noncircular vessels was derived and finite element analysis was conducted to simulate the artery buckling behavior under lumen pressure and axial tension. The arterial wall was modeled as a thick-walled cylinder with hyper-elastic anisotropic and homogeneous material. The results demonstrated that oval or eccentric cross-section increases the critical buckling pressure of arteries and having both ovalness and eccentricity would further enhance the effect. We conclude that variations of the cross-sectional shape affect the critical pressure of arteries. These results improve the understanding of the mechanical stability of arteries.

Mechanical Design, Additive Manufacturing, and Performance of Equal Volume Metamaterials

2021 ◽  
Author(s):  
Richárd Horváth ◽  
Vendel Barth ◽  
Viktor Gonda ◽  
Mihály Réger ◽  
Imre Felde
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Energy Absorption ◽  
Mechanical Design ◽  
Area Under The Curve ◽  
Cell Number ◽  
Element Analysis ◽  
Cross Sectional ◽  
Unit Cells ◽  
And Performance

Abstract In this paper, we study the energy absorption of metamaterials composed of unit cells whose special geometry makes the cross-sectional area and the volume of the bodies generated from them constant (for the same enclosing box dimensions). After a parametric description of such special geometries, we analyzed by finite element analysis the deformation of the metamaterials we have designed during compression. We 3D printed the designed metamaterials from plastic to subject them to real compression. The results of the finite element analysis were compared with the real compaction results. Then, for each test specimen, we plotted its compaction curve. By fitting a polynomial to the compaction curves and integrating it (area under the curve), the energy absorption of the samples can be obtained. As a result of these investigations, we drew a conclusion about the relationship between energy absorption and cell number.

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