碳纤维复合材料假脚冲击后疲劳性能影响因素分析

发布时间：2019-05-15 05:10

【摘要】：基于三维逐渐损伤理论和有限元法,对碳纤维复合材料假脚在冲击载荷及冲击后疲劳载荷作用下的破坏过程进行分析,研究了不同冲击能量、不同冲头材料、不同应力水平等因素对碳纤维假脚的冲击损伤及疲劳性能的影响规律。结果表明,在冲击载荷作用下,碳纤维复合材料假脚的损伤模式主要为基体开裂、纤维压缩和分层。随着冲击能量的增加,上述3种破坏模式的损伤单元数逐渐增大;尽管随着冲击能量的增加,碳纤维复合材料假脚的疲劳循环次数逐渐降低,但二者之间并不满足线性关系,即存在冲击能门槛值。对于碳纤维复合材料假脚而言,其冲击能门槛值为7J;冲头材料越硬,碳纤维复合材料结构件的冲击损伤面积越大,疲劳性能下降越剧烈;碳纤维复合材料假脚的疲劳循环次数随着加载应力的增加而显著降低。
[Abstract]:Based on the three-dimensional gradual damage theory and finite element method, the failure process of carbon fiber composite feet under impact load and fatigue load after impact is analyzed, and different impact energy and different punch materials are studied. Effects of different stress levels on impact damage and fatigue properties of carbon fiber feet. The results show that the damage modes of carbon fiber composite feet under impact load are mainly matrix cracking, fiber compression and delamination. With the increase of impact energy, the number of damage elements in the above three failure modes increases gradually. Although the number of fatigue cycles of carbon fiber composite feet decreases gradually with the increase of impact energy, the relationship between them does not satisfy the linear relationship, that is, there is a threshold value of impact energy. For the carbon fiber composite false foot, the impact energy threshold is 7J, the harder the punch material is, the larger the impact damage area of the carbon fiber composite structure is, and the more severe the fatigue performance decreases. The fatigue cycle times of carbon fiber composite feet decreased significantly with the increase of loading stress.
【作者单位】：上海理工大学教育部微创医疗器械工程中心;
【基金】：国家自然科学基金(51305268) 上海工程技术研究中心资助项目(15DZ2251700)
【分类号】：TB33

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