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本工作对[±θ/90_2]_s 和[0_n/90_2)_S 两系列碳/环氧层板在拉仲载荷下的横向裂缝与分层损伤,进行了实验研究和有限元分析。采用声发射技术跟踪配合显微观测多向层板损伤过程,分析了θ角变化与力学性能、初始损伤、累积等的关系.表明实测横向开裂与分层结果和采用能量判据有限元计算预测比较,符合良好。同时在扫描电镜内进行各类层板压缩试验,动态观测破坏形貌,讨论了不同θ铺层角的微观破坏机理。
In this work, the transverse cracks and delamination damage of [± θ / 90_2] _s and [0_n / 90_2) _S two series of carbon / epoxy laminates under tensile load were investigated experimentally and analyzed by finite element method. The relationship between θ angle variation and mechanical properties, initial damage, accumulation and so on was analyzed by using acoustic emission technology to track the damage process of multidirectional laminates with microscopic observation. It was shown that the actual results of transverse cracking and stratification and the finite element calculation of energy criterion Comparison, in line with good. At the same time, various kinds of laminate compression tests were carried out in a scanning electron microscope to observe the failure morphology dynamically and discuss the microscopic failure mechanism at different θ layers angles.