碳纤维复合材料超声扫描分层检测及评价方法

doi:10.7527/S1000-6893.2015.0324

Abstract

Abstract:

Because of the anisotropy, carbon fiber reinforced plastics (CFRP) materials are prone to form machining defects in drilling processes, such as delamination, tearing and burr, among which delamination has the most important influence on composites properties. Therefore, it is essential to establish a set of methods to detect and evaluate delamination clearly. Based on the mechanism of delamination and analysis of current detection and evaluation methods, a kind of 3-D delamination factor evaluation method is proposed by high frequency scanning acoustic microscope (SAM), and delamination characteristics of T800/X850 are identified based on SAM. Finally, the results were also compared between 3-D delamination factor method and traditional methods. The results show that delamination defects are caused by mechanical-thermal coupling which may induce interlayer bonding failure and the exit is more serious. What's more, delamination of no less than 8 layers in CFRP could be detected by SAM and internal layered characteristics of at least five layers could be obviously detected. Delamination could be transferred to other layers and interfacial bonding strength shows the best when the adjacent layers are in the same orientation. Moreover, 3-D delamination factor could evaluate the internal defects of composite laminates more accurately.

Key words: CFRP, drilling defects, delamination mechanism, SAM, delamination factor

CLC Number:

WEI Yingying, AN Qinglong, CAI Xiaojiang, CHEN Ming. CFRP ultrasonic scan delamination detection and evaluation method[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016, 37(11): 3512-3519.

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CFRP ultrasonic scan delamination detection and evaluation method

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