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.
1 Liu Jinsong, Liu Zhiquan. Application of modern polymer materials in the area of prosthetics and orthotics[J]. Chinese J Rehabilitation Theory Practice, 2004,10(10):634(in Chinese). 刘劲松, 刘志泉. 现代高分子材料在假肢矫形技术领域中的应用[J]. 中国康复理论与实践, 2004,10(10):634. 2 Rikard B, Nilsson L, Simonsson K, et al. Simulation of low velocity impact on fiber laminates using a cohesive zone based delamination model[J]. Compos Sci Technol, 2011,64(2):279. 3 Schmidt F, Rheinfurth M, Protz R, et al. Monitoring of multiaxial fatigue damage evolution in impacted composite tubes using non-destructive evaluation[J]. Composites: Part A, 2012,43:537. 4 Shi W J, Hu W P, Zhang M, et al. A damage mechanics model for fatigue life prediction of fiber reinforced polymer composite lamina[J]. Acta Mechanica Solida Sinica, 2011,5(24):399. 5 Zhu Weiyao, Xu Xiwu. Experiment research on residual compressive strength and fatigue performance of composite laminates with low velocity impact damage[J]. Acta Materiae Compositae Sinica, 2012,29(5):171(in Chinese). 朱炜垚, 许希武. 含低速冲击损伤复合材料层合板剩余压缩强度及疲劳性能试验研究[J]. 复合材料学报, 2012,29(5):171. 6 Koo J M, Choi J H, Seok C S. Evaluation for residual strength and fatigue characteristics after impact in CFRP composites[J]. Compo-site Structures, 2013,105:58. 7 Koo J M, Choi J H, Seok C S. Prediction of post-impact residual strength and fatigue characteristics after impact of CFRP composite structures[J]. Composites: Part B, 2014,61:300. 8 Uyaner M, Kara M, Sahin A. Fatigue behavior of filament wound E-glass/epoxy composite tubes damaged by low velocity impact[J]. Composites: Part B, 2014,61:358. 9 Tarpani J R, Canto R B, Saracura R G M, et al. Compression after impact and fatigue of reconsolidated fiber-reinforced thermoplastic matrix solid composite laminate[J]. Procedia Mater Sci, 2014,3:485. 10崔海坡, 赵改平, 黄晶晶, 等. 碳纤维双弹全地形假脚脚板. 中国, 200810200227.5[P]. 2011-11-09. 11Hou J P, Petrinic N, Ruiz C, et al. Prediction of impact damage in composite plates[J]. Compos Sci Technol, 2000,60:273. 12Tserpes K I, Labeas G, Papanikos P, et al. Stength prediction of bolted joints in graphite/epoxy composite laminates[J]. Compo-sites: Part B, 2002,33:521. 13Shokrieh M M, Lessard L B. Multiaxial fatigue behaviour of unidirectional plies based on uniaxial fatigue experiments—Ⅰ: Modelling[J]. Int J Fatigue, 1997,19(3):201. 14Shokrieh M M, Lessard L B. Progressive fatigue damage modeling of composite materials, Part Ⅰ: Modeling[J]. J Compos Mater,2000,34(13):1056.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2017, Vol. 31 
