碳纤维增强环氧复合材料微可见冲击损伤的超声实验评估

Materials Open Research Pub Date : 2023-02-27 DOI:10.12688/materialsopenres.17525.1

Yee Vien Tan, W. L. Lai, H. Saeedipour, Mohd Shukry Adul Majid, K. Goh

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引用次数: 0

摘要

背景:碳纤维增强环氧树脂(CFRP)容易受到冲击损伤，从而导致机械性能下降。本文研究了几乎不可见冲击损伤(BVID)的结构，以了解不同厚度的准各向同性CFRP复合材料(分别为3,4,5 mm的16、24和32层复合材料)的损伤程度。方法:选择准静态压痕在CFRP层压板上产生BVID，然后采用非破坏性评价方法，即传统的接触型超声检测(UT)和c模扫描声学显微镜(C-SAM)方法。结果:研究结果揭示了(1)碳纤维复合材料层合板的BVID的大小和形状;(2)在损伤点未发现损伤;(3)由于碳纤维条取向不同，撞击点与外损伤直径之间存在桥接，在结构破坏前表现出优异的力学性能。结论:UT和C-SAM方法可以识别CFRP复合材料的原始区域和内部损伤结构。

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Experimental assessment of barely visible impact damage carbon fibre reinforced epoxy composite using ultrasound method

Background: Carbon fibre reinforced epoxy (CFRP) is susceptible to impact damage which could resulted in reduction of the mechanical properties. This paper studies the architecture of barely visible impact damage (BVID) to comprehend the extent of damage on quasi-isotropic CFRP laminates of varying thickness (i.e. 16, 24 and 32-ply laminates of 3, 4 and 5 mm respectively). Methods: Quasi-static indentation is chosen to produce BVID on CFRP laminates, followed by using non-destruction evaluation method, namely conventional contact-type ultrasonic testing (UT) and C-mode scanning acoustic microscopy (C-SAM) method. Results: The findings revealed (1) the size and shapes of the BVID on CFRP laminates, (2) no damage found at the point of damage, and (3) the bridging between the point of impact to the outer damaged diameter due to the consequence of diverse orientation of carbon fibre strips which exhibit excellent mechanical properties before structural failure. Conclusions: The results concluded that the UT and C-SAM method can identify both the pristine region and the internal damaged structures in CFRP laminates.

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Materials Open Research materials science-

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