Computational comparison study of virtual compression and shear test for estimation of apparent elastic moduli under various boundary conditions

Jisun Kim; Jung Jin Kim

doi:10.1002/cnm.3845

journal article Jul 09, 2024

Computational comparison study of virtual compression and shear test for estimation of apparent elastic moduli under various boundary conditions

Jisun Kim

Jung Jin Kim

International Journal for Numerical Methods in Biomedical Engineering Vol. 40 No. 9 · Wiley

View at Publisher Save 10.1002/cnm.3845

Abstract

AbstractVirtual compression tests based on finite element analysis are representative noninvasive methods to evaluate bone strength. However, owing to the characteristic porous structure of bones, the material obtained from micro‐computed tomography images in the finite‐element model is not uniformly distributed. These characteristics cause differences in the apparent elastic moduli depending on the boundary conditions and affect the accuracy of bone‐strength evaluation. Therefore, this study aimed to evaluate and compare the apparent elastic moduli under various, virtual‐compression and shear‐test boundary conditions. Four, nonuniform models were constructed with increasing model complexity. For representative boundary conditions, two, different, testing directions, and constrained surfaces were applied. As a result, the apparent elastic moduli of the nonuniform model varied up to 55.2% based on where the constrained surface was located in the single‐end‐cemented condition. Additionally, when connectivity in the test direction was lost, the accuracy of the apparent elastic moduli was low. A graphical comparison showed that the equivalent‐stress distribution was more advantageous for analyzing load transferability and physical behavior than the strain‐energy distribution. These results clearly show that the prediction accuracy of the apparent elastic moduli can be guaranteed if the boundary condition on the constraint and loading surfaces of the nonuniform model are applied symmetrically and the connectivity of the elements in the testing direction is well maintained. This study will aid in precision improvement of bone‐strength‐indicator determination for osteoporosis prevention.

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Details

Published: Jul 09, 2024
Vol/Issue: 40(9)
License: View

Authors

J

Jisun Kim

Department of Mechanical Engineering Keimyung University Daegu Republic of Korea

J

Jung Jin Kim

Department of Mechanical Engineering Keimyung University Daegu Republic of Korea

Cite This Article

Jisun Kim, Jung Jin Kim (2024). Computational comparison study of virtual compression and shear test for estimation of apparent elastic moduli under various boundary conditions. International Journal for Numerical Methods in Biomedical Engineering, 40(9). https://doi.org/10.1002/cnm.3845

Computational comparison study of virtual compression and shear test for estimation of apparent elastic moduli under various boundary conditions

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