Experimental investigation and characterisation techniques of compressive fatigue failure of composites with fibre waviness at ply drops
Experimental investigation and characterisation techniques of compressive fatigue failure of composites with fibre waviness at ply drops
复制标题
DOI：
10.1016/j.compstruct.2013.01.010
复制
发表时间：
2013-06-01
影响因子：
6.3
通讯作者：
Etches, J.
中科院分区：
文献类型：
--
作者：
Wang, J.;Potter, K. D.;Etches, J.
内部特征，如纤维波纹度和铺层下降，对复合材料结构的疲劳性能有影响。在这项研究中，通过将不连续层块反对称地放置在连续波浪层的两侧，将波浪层夹在直层之间来制造样本。这些样本代表了在铺层下降和树脂富集区域的部件中可能发生的纤维错位类型。还开发了使用应变计软件的实验表征技术，通过测量层间横向位移来检测分层的开始及其传播。具有纵向不连续层片的试样在压缩中没有失败，而是在层片下降处开始分层而失败。具有横向不连续铺层的样本都没有由于波浪铺层的错位而直接在压缩中失效。疲劳失效机制是相同的静态载荷下观察到在以前的工作，这有利于疲劳模型的发展。(C)2013爱思唯尔有限公司保留所有权利。
Internal features, such as fibre waviness and ply drops, have an impact on fatigue performance of composite structures. In this investigation, specimens were manufactured with wavy plies sandwiched between straight plies by placing blocks of discontinuous plies anti-symmetrically on either side of the continuous wavy plies. The specimens were representative of the kind of fibre misalignment that can occur in components at ply drops and resin rich areas. Experimental characterisation techniques using strain gauge software were also developed for detecting the initiation of delamination and its propagation, by measuring interlaminar transverse displacements. Specimens with longitudinal discontinuous plies did not fail in compression but rather failed by delamination initiating at the ply drops. None of specimens with transverse discontinuous plies failed directly in compression due to misalignment in the wavy plies. The fatigue failure mechanisms are the same as those observed under static loading in previous work, which facilitates development of a fatigue model. (C) 2013 Elsevier Ltd. All rights reserved.