材料科学
声发射
复合材料
极限抗拉强度
振幅
残余强度
纤维增强塑料
降级(电信)
常量(计算机编程)
剪切(地质)
结构工程
计算机科学
电信
物理
量子力学
程序设计语言
工程类
作者
T.P. Philippidis,Theoni T. Assimakopoulou
标识
DOI:10.1016/j.compscitech.2007.08.012
摘要
Acoustic emission was used to assess static shear strength degradation, due to fatigue, in unidirectional fibre-reinforced composites. According to standard specifications, [±45]S specimens were used. Coupons, made of Gl/Ep material, were subjected to tensile constant or variable amplitude loading, at several stress level and life fraction combinations, to investigate influence of various loading configurations on damage accumulation. Two acoustic emission descriptors were introduced and respective engineering models, estimating residual strength, were developed. The performance of the former scheme was excellent, although knowledge of the maximum loading stress value was required in the implementation. In the second scheme, on the other hand, no additional information on the specimen load history was needed. The potential of both models was also validated on two independent verification sets: one consisting of specimens loaded under a variable amplitude spectrum and another of an alternative matrix system, subjected to constant amplitude fatigue.
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