EXPERIMENTAL STUDY ON DEFORMATION AND FAILURE OF CARBON FIBER BRAIDED COMPOSITE

Abstract

Abstract: The damage evolution of carbon fiber braided composites was studied by using the acoustic emission (AE) and digital image correlation (DIC) method. The relationship between mechanical loading, deformation and strain field and acoustic emission characteristic parameters of carbon fiber braided composites was analyzed by collecting acoustic emission signals and damage deformation field information during tensile test. The results show that the displacement, strain field and the AE signal characteristic parameters of the composites can describe the damage accumulation and failure process of the composites during tensile test. The tensile process is divided into two stages: damage accumulation stage and damage stage. In the early stage of loading, low amplitude signals with the amplitude from 40 to 60 dB are generated. As the load increases, the number of cumulative hits increases dramatically, and high-amplitude, high-duration-time signal means that a variety of damages occur at the same time in damage stage. In addition, it is found that the displacement and the maximum tensile strain increase and then decrease in the same load increment measured by DIC.

Key words: carbon fiber braided composite, acoustic emission, digital image correlation, damage evolution

CLC Number:

TB332

LU Bo-yuan, ZHAO Jing, WEI Zi-hui, ZHOU Wei. EXPERIMENTAL STUDY ON DEFORMATION AND FAILURE OF CARBON FIBER BRAIDED COMPOSITE[J]. Fiber Reinforced Plastics/Composites, 2017, 0(5): 22-27.

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