碳纤维复合材料假脚冲击后的疲劳试验

发布时间：2018-01-21 10:46

  本文关键词： 假脚 冲击损伤 疲劳寿命 碳纤维复合材料　出处：《材料科学与工程学报》2017年02期 　论文类型：期刊论文

【摘要】：针对一种新型结构的碳纤维复合材料假脚,开展了自由落体冲击试验及冲击后疲劳寿命试验,分析了不同铺层参数、不同冲击能量等因素对其冲击损伤及疲劳寿命的影响规律。结果表明,不同铺层参数对碳纤维复合材料假脚U形结构件的冲击损伤具有显著影响,且随着0°铺层含量的降低,试件的冲击损伤面积增加,外观损伤越来越严重;碳纤维复合材料结构件的疲劳性能对冲击能量比较敏感,随着冲击能量的增加,碳纤维结构件的冲击损伤面积明显增大,其疲劳寿命逐渐降低。在冲击能量从4J增加到10J的情况下,碳纤维复合材料假脚的疲劳寿命大幅度降低了66.8%;尽管随着冲击能量的增加,试件的疲劳寿命逐渐降低,但二者之间并不符合线性关系,即冲击能量存在一门槛值,当冲击能量超过该门槛值后,其对碳纤维结构件疲劳寿命的影响将减弱;仅当碳纤维复合材料假脚的后龙骨厚度为2.7mm,且冲击能量≤4J的情况下,其疲劳寿命才可较好地满足相关安全标准的要求。
[Abstract]:For a new type of carbon fiber composite artificial foot, the free-fall impact test and post-impact fatigue life test were carried out, and the different layer parameters were analyzed. The effects of different impact energy on the impact damage and fatigue life of carbon fiber composite are studied. The results show that the impact damage of carbon fiber composite with U-shaped artificial foot is significantly affected by different layer parameters. With the decrease of 0 掳layer content, the impact damage area increases and the appearance damage becomes more and more serious. The fatigue properties of CFRP structures are sensitive to impact energy. With the increase of impact energy, the impact damage area of CFRP structures increases obviously. When the impact energy increased from 4 J to 10 J, the fatigue life of carbon fiber composite foot decreased by 66.8%. Although the fatigue life of the specimen decreases gradually with the increase of impact energy, the relationship between the two does not accord with the linear relationship, that is, there is a threshold value of impact energy, when the impact energy exceeds this threshold. Its influence on fatigue life of carbon fiber structure will be weakened. Only when the thickness of the rear keel of carbon fiber composite prosthetic foot is 2.7 mm and the impact energy is 鈮，

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