Data underlying the article: Unfolding the early fatigue damage process for CFRP cross-ply laminates

This study investigates the early fatigue damage of cross-ply carbon/epoxy laminates. The aim is to unfold the damage accumulation process, understand the interaction between different damage mechanisms, and quantify their contribution to stiffness degradation. Tension-tension fatigue tests were performed, while edge observation and DIC technique monitored the damage evolution. It was found that different accumulation process and interactive levels between transverse matrix cracks and delamination exist for specimens with similar stiffness degradation. A linear increase of stiffness degradation was observed with the increase of matrix crack density, while the growing trend of stiffness degradation converged with the increase of delamination.

本研究针对交叉铺层碳/环氧层合板的早期疲劳损伤开展探究，旨在阐明损伤累积过程、厘清不同损伤机制间的交互作用，并量化其对刚度退化的贡献程度。试验采用拉-拉疲劳加载方案，辅以边缘观测与数字图像相关（Digital Image Correlation, DIC）技术对损伤演化过程进行实时监测。研究发现，在刚度退化程度相近的试样中，横向基体裂纹与分层脱层的损伤累积过程及交互作用水平存在显著差异；随着基体裂纹密度提升，刚度退化呈线性增长趋势，而随着分层脱层程度增加，刚度退化的增长趋势逐渐趋于收敛。