Ultrasonic detection and sizing of compressed cracks in glass- and carbon-fibre reinforced plastic composites
Ultrasonic detection and sizing of compressed cracks in glass- and carbon-fibre reinforced plastic composites
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DOI：
10.1016/j.ndteint.2017.08.004
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发表时间：
2017-12-01
影响因子：
4.2
通讯作者：
Wang, C. H.
中科院分区：
文献类型：
--
作者：
Ibrahim, M. E.;Smith, R. A.;Wang, C. H.
压缩裂纹的无损评估是一个重大挑战。定量研究了裂纹尖端闭合对脉冲回波超声对纤维增强聚合物基复合材料分层的影响。特别地，本研究侧重于超声与闭合裂纹或接吻脱粘的相互作用，以及它们对由碳层和玻璃层组成的玻璃钢层合板的超声可探伤性的影响。通过脉冲回波和透透射超声测量可以清楚地检测到这两种不同层压板类型的层压板裂纹的压缩，但两种材料类型的反射超声脉冲表现出明显不同的行为。玻璃纤维层压板在裂纹打开时反射信号下降到裂纹扩展载荷的大约一半，而相应的碳纤维层压板在裂纹打开时显示出预期的反射信号增加。本文详细分析了裂纹闭合对超声波反射和透射影响的来源，以确定造成这些影响的可能机制。
Nondestructive evaluation of compressed cracks is a major challenge. A quantitative study of the effect of crack tip closure on the pulse-echo ultrasonic sizing of delaminations in fibre-reinforced polymer-matrix composites (FRP) is presented. In particular, this study focuses on the interaction of ultrasound with a closed crack or kissing disbond, and their effect on the ultrasonic inspectability of FRP laminates consisting of carbon and glass plies. The compression of laminar cracks in these two different laminate types is clearly detectable via both pulse-echo and through-transmission ultrasonic measurements, but the reflected ultrasonic pulses in the two material types exhibit markedly different behaviour. The glass-fibre laminates show a drop in the reflected signal for crack openings up to approximately half the crack growth load, whereas the corresponding carbon-fibre laminates show the expected increase in the reflected signal as the crack opens. The origins of the observed effect of crack closure on the reflection and transmission of ultrasound are analysed in detail to ascertain possible mechanisms responsible for these effects.