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| Influencing Factors Analysis for Fatigue Property of Carbon Fiber Composites Prosthetic Foot after Impact |
| CUI Haipo, ZHANG Mengxue, ZHANG Along
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| Shanghai Institute for Minimally Invasive Therapy, University of Shanghai for Science and Technology, Shanghai 200093 |
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Abstract The damage process of carbon fiber composites prosthetic foot under the impact loading and fatigue loading after impact were analyzed based on the 3D progressive damage theory and finite element method. The influence of impact energy, impact tup material and stress level on the impact damage and fatigue property of prosthetic foot were researched. The results showed that the main damage modes of carbon fiber composites prosthetic foot under the impact loading were matrix cracking, fiber crushing and delamination. The damage area of these damage modes increased with the increasing impact energy. Although the fatigue life cycle gradually decreased with the increasing impact energy, there was no linear relationship between them, which meant that there was a impact energy threshold. For carbon fiber composites prosthetic foot, the threshold was 7 J. With the enhancement of the hardness of impact tup, the impact damage area increased and fatigue property decreased wildly. The fatigue life cycle of carbon fiber compo-sites prosthetic foot decreased rapidly with the increasing stress level.
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Published: 08 May 2018
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2017, Vol. 31 
