Corrosion fatigue behavior of additively manufactured biodegradable porous iron
Y. Li (TU Delft - Biomaterials & Tissue Biomechanics)
Karel Lietaert (Katholieke Universiteit Leuven, 3D Systems – LayerWise NV)
W. Li (TU Delft - (OLD) MSE-3)
X. Y. Zhang (Tsinghua University)
Sander Leeflang (TU Delft - Biomaterials & Tissue Biomechanics)
Jie Zhou (TU Delft - Biomaterials & Tissue Biomechanics)
Amir Abbas Zadpoor (TU Delft - Biomaterials & Tissue Biomechanics)
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Abstract
The corrosion fatigue behavior of additively manufactured topologically ordered porous iron based on diamond unit cells was studied for the first time to understand its response to cyclic loading in a simulated physiological environment. The material exhibited high fatigue resistance with fatigue strengths being 70% and 65% of yield stress in air and revised simulated body fluid, respectively, mainly due to its slow degradation and excellent ductility. However, cyclic loading significantly increased biodegradation rate, especially at higher stress levels. The observed extraordinary fatigue strength, slow biodegradation and high ductility underline the importance of porous iron as a promising bone-substituting material.
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