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Influence of drilling and abrasive water jet induced damage on the performance of carbon fabric/epoxy plates with holes

机译：钻孔和水射流引起的损伤对带孔碳纤维/环氧树脂板性能的影响

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摘要

The influence of conventional drilling (CD) and abrasive water jet (AWJ) cutting on the fatigue performance of carbon fabric/epoxy plates was investigated. Observations of machined hole regions revealed more severe damage on the CD hole surfaces with larger damage regions penetrating into the material. For both material systems investigated, the surface roughness for AWJ holes was in fact higher in comparison to CD holes. Nonetheless, static properties, short-term fatigue properties and endurance limits of the plates were not affected by the machining technique. Observed damage, stiffness and temperature evolutions during short-duration cyclic tests showed no significant changes in fatigue response for CD and AWJ plates, suggesting that surface roughness is not a good indicator of hole quality. However, long-duration cyclic tests revealed that CD plates exhibited greater stiffness degradation and advanced damage after a cyclic threshold, beyond which machining-induced delamination cracks began to propagate. This was not observed for the AWJ plates, where instead cyclic loading-induced delamination cracks initiated and propagated much later. These key findings are critical for assessing the unique performance characteristics of fabric/epoxy plates with holes. Since these materials are increasingly used for primary fatigue-critical structures, the presented outcomes are vital for designing corresponding structure joining methods. (C) 2016 Elsevier Ltd. All rights reserved.
机译：研究了常规钻孔（CD）和磨料水射流（AWJ）切割对碳纤维织物/环氧树脂板疲劳性能的影响。加工孔区域的观察结果显示，CD孔表面受到的破坏更为严重，较大的破坏区域会渗透到材料中。对于所研究的两种材料系统，AWJ孔的表面粗糙度实际上都比CD孔高。尽管如此，板的静态性能，短期疲劳性能和耐久极限不受加工技术的影响。在短期循环测试中观察到的损伤，刚度和温度变化表明，CD和AWJ板的疲劳响应没有显着变化，这表明表面粗糙度不是孔质量的良好指标。但是，长期的循环测试表明，CD板在循环阈值后表现出更大的刚度退化和进一步的损坏，超过此阈值，加工引起的分层裂纹开始蔓延。对于AWJ板则没有观察到这种情况，相反，循环加载引起的分层裂纹在很长时间后就开始并传播了。这些关键发现对于评估带孔织物/环氧树脂板的独特性能至关重要。由于这些材料越来越多地用于主要的疲劳关键结构，因此提出的结果对于设计相应的结构连接方法至关重要。 （C）2016 Elsevier Ltd.保留所有权利。

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