Data underlying the article: Early fatigue damage accumulation of CFRP Cross-Ply laminates considering size and stress level effects

Ply-block size and stress level effect on accumulation of transverse cracks and delamination are investigated during early fatigue life of CFRP laminates. Tension-tension fatigue tests under different stress levels were performed for two cross-ply configurations. Edge observation with digital cameras, digital image correlation and acoustic emission were employed for in-situ damage monitoring. Transverse cracks were dominant for [0/90₂]_s laminates with almost non-existent delamination, while different interactive levels between both damage mechanisms occurred for [0₂/90₄]_s laminates. Poisson’s ratio identifies whether early fatigue damage is dominant by transverse cracks or involves delamination. Cumulative AE energy is a helpful indicator of crack density.

本研究针对碳纤维增强聚合物层合板（Carbon Fiber Reinforced Polymer laminates, CFRP）疲劳早期阶段的横向裂纹与分层累积效应，探究铺层块尺寸及应力水平的影响规律。针对两种正交铺层构型，开展了不同应力水平下的拉-拉疲劳试验。采用数码相机进行边缘观测、结合数字图像相关法（Digital Image Correlation）与声发射（Acoustic Emission）技术完成原位损伤监测。结果显示，[0/90₂]ₛ层合板以横向裂纹为主要损伤形式，分层现象几乎不存在；而[0₂/90₄]ₛ层合板中，两种损伤机制呈现出不同程度的交互作用。泊松比可用于判别疲劳早期损伤是以横向裂纹为主，还是伴随分层产生。累积声发射能量可作为裂纹密度的有效表征指标。