STUDY ON THE TENSILE DAMAGE EVOLUTION BEHAVIOR OF THREE DIMENSIONAL FIVE DIRECTIONAL CARBON FIBER BRAIDED COMPOSITES

Abstract

Abstract: In order to reveal the damage evolution rule and the effect of the damage mode on the properties of the composites under different fiber volume fraction, combined with the Acoustic Emission (AE), Digital Image Correlation (DIC) and Infrared Thermography (IT) complementary monitoring technology, the tensile mechanical properties of the composites were tested and the AE signals under tensile load and the surface strain field and temperature field information during the damage process were obtained dynamically. The results show that, with the increase of fiber volume fraction, the failure load and fracture strength of carbon fiber three-dimensional five-direction composite material increase, the relative energy increase, and the AE signal grows faster per unit time. Obvious strain concentration occurs in the interlaced area of yarn, forming a serrated strain concentration belt. With the continuous increase of tensile load, the surface temperature of the composite specimen increases continuously, and the specimen has obvious temperature characterization at the moment of failure, which is consistent with the failure characterization of strain field instability. Therefore, the combination of AE, DIC and IT complementary detection technology can effectively monitor the damage evolution process of fiber three-dimensional five-directional braid composite materials, providing reference for the structural health detection.

Key words: three-dimensional five-directional braided composite, acoustic emission, digital image correlation, infrared thermography, tensile deformation damage

CLC Number:

TB332

HAN Kang-ning, LI Xiao-tong, QIN Reng, ZHOU Wei. STUDY ON THE TENSILE DAMAGE EVOLUTION BEHAVIOR OF THREE DIMENSIONAL FIVE DIRECTIONAL CARBON FIBER BRAIDED COMPOSITES[J]. Fiber Reinforced Plastics/Composites, 2019, 0(7): 21-27.

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