Student Conference Proceedings
Vol. 1 No. 1 (2025): Stud Conf Proc
https://doi.org/10.18416/SCP.2025.1931

Biomedical Engineering, ID 1931

Determination of the yield strength through bending tests and finite element analysis

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Swantje Richter (Study program Biomedical Engineering, Luebeck University of Applied Sciences, Lübeck, Germany), Robert Wendlandt  (Biomechanics Laboratory of the Clinic for Orthopedics and Trauma Surgery, University Medical Center Schleswig- Holstein, Campus Lübeck, Germany)

Copyright (c) 2025 Swantje Richter; Robert Wendlandt

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This work is licensed under a Creative Commons Attribution 4.0 International License.

Abstract

The yield strength is typically determined by performing tensile tests, as material non-linearities preclude accurate estimation in other load cases. Conversely, the objective of this project is to obtain these material parameters from the force-deformation curve of a four-point bending test. To this end, an iterative optimization process was implemented using the finite element method and the programming language R. The SDAR-algorithm is used to determine the Young’s modulus. The estimation of the yield strength and the constant n is achieved through the Ramberg-Osgood-Equation, a model that successfully delineates the stress-strain curve with a mere three parameters. Synthetic test data was used to determine the accuracy of yield strength determination, yielding a relative error of 0.2 %.

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