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基于聚焦粒子束技术的碳纤维单丝断裂韧性实验研究

, PP. 228-232

Keywords: 碳纤维,单丝,断裂韧性,聚焦粒子束,强度-镜像方法

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Abstract:

以商用碳纤维T300和T800为研究对象,采用聚焦粒子束(FIB)技术精确刻蚀了碳纤维单丝的缺陷,分析了碳纤维单丝的断裂性能。通过单丝拉伸试验获得碳纤维拉伸强度,并利用扫描电镜观察试件的断裂截面,基于镜像方法和Griffith断裂理论获得拉伸强度与镜像半径之间的关系,进而对碳纤维单丝的断裂韧性KIC进行了估算。结果表明:采用FIB刻蚀缺陷的方法估算得到的T300碳纤维单丝的KIC为1.32MPa·m1/2,与采用试剂溶解方法得到的数据(1.25MPa·m1/2)相比较,两者相差小于10%。

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