Effects of local fibre waviness on damage mechanisms and fatigue behaviour of biaxially loaded tube specimens

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• 作者：F. Schmidt^a ; ^{frank.schmidt@tu-braunschweig.de} ; M. Rheinfurth^b ; P. Horst^a ; G. Busse^b
• 关键词：A. Polymer-matrix composites ; B. Fatigue ; B. Mechanical properties ; D. Non-destructive testing ; D. Ultrasonics
• 刊名：Composites Science and Technology
• 出版年：2012
• 期刊代码：19_02663538
• 类别：ms
• 出版时间：8 June, 2012
• 卷：72
• 期：10
• 页码：1075-1082
• 文件大小：1290 K

摘要

Damage development in and final failure process of glass fibre winding specimens during biaxial fatigue loading are investigated. The phenomena in nominally defect-free tubes and specimens exhibiting local fibre waviness in one layer are compared. A subset of wound tubes is analysed using non-destructive testing methods, i.e. air-coupled guided waves, thermography, optical fracture analysis by a high-speed camera, and discrete damage monitoring. Air-coupled guided waves are employed for detection of fibre waviness and for monitoring the failure progress initiated by this waviness. Stiffness degradation due to fatigue damage corresponds to a decline in guided wave velocity. Using infrared inspection, the fibre waviness can be detected in an early stage of fatigue life. Non-destructive evaluation reveals that initiation of final failure in the specimens is caused by local fibre waviness. Finally, the effect of local fibre waviness on the S-N curves of the specimens is illustrated.