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On the fatigue response of a bonded repaired aerospace composite using thermography

机译：热成像法研究粘结修复航空复合材料的疲劳响应

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摘要

Lock-in thermography was employed to investigate the repair efficiency of a bonded repaired aerospace composite subjected to step-wise cycling mechanical loading. The studied component (substrate) was artificially damaged with a 5mm circular notch and subsequently repaired with a tapered bonded patch. Critical and subcritical damage of the repaired component was monitored via thermography during 5 Hz tension-tension fatigue. The examination of the acquired thermographs enabled the identification of the patch debonding propagation as well as the quantification of the stress magnification at the patch ends and the locus of the circular notch. It was found that fatigue mechanical loading yields both thermoelastic and hysterestic phenomena with the latter being more prominent prior to the failure of the studied repaired component.
机译：锁定热成像技术用于研究粘结的航空航天复合材料在逐步循环机械载荷下的修复效率。所研究的组件（基板）被5mm的圆形槽口人为损坏，随后用锥形粘结补丁修复。在5 Hz张力-张力疲劳期间，通过热像仪监测修复部件的严重和亚临界损坏。对所获取的热像图的检查可以识别斑块的脱粘传播，并可以量化斑块末端和圆形凹口位置的应力放大率。已经发现，疲劳机械载荷会同时产生热弹性和磁滞现象，后者在所研究的维修部件失效之前更为突出。

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