PDF(Pubmed)
Abstract：
This paper presents a mesoscale damage model for composite materials and its validation at the coupon level by predicting scaling effects in un-notched carbon-fiber reinforced polymer (CFRP) laminates. The proposed material model presents a revised longitudinal damage law that accounts for the effect of complex 3D stress states in the prediction of onset and broadening of longitudinal compressive failure mechanisms. To predict transverse failure mechanisms of unidirectional CFRPs, this model was then combined with a 3D frictional smeared crack model. The complete mesoscale damage model was implemented in ABAQUS®/Explicit. Intralaminar damage onset and propagation were predicted using solid elements, and in-situ properties were included using different material cards according to the position and effective thickness of the plies. Delamination was captured using cohesive elements. To validate the implemented damage model, the analysis of size effects in quasi-isotropic un-notched coupons under tensile and compressive loading was compared with the test data available in the literature. Two types of scaling were addressed: sublaminate-level scaling, obtained by the repetition of the sublaminate stacking sequence, and ply-level scaling, realized by changing the effective thickness of each ply block. Validation was successfully completed as the obtained results were in agreement with the experimental findings, having an acceptable deviation from the mean experimental values.
摘要：
本文通过预测无缺口碳纤维增强聚合物（CFRP）层压板的缩放效应，提出了复合材料的中尺度损伤模型及其在试片级别的验证。拟议的材料模型提出了修订的纵向损伤定律，该定律考虑了复杂的3D应力状态在预测纵向压缩破坏机制的开始和扩展中的影响。为了预测单向CFRP的横向破坏机制，然后将该模型与3D摩擦涂抹裂纹模型相结合。完整的中尺度损伤模型在ABAQUS®/Explicit中实现。使用固体元素预测了层内损伤的发生和传播，根据层板的位置和有效厚度，使用不同的材料卡包括原位性能。使用内聚元素捕获分层。要验证已实现的损伤模型，在拉伸和压缩载荷下准各向同性无缺口试样的尺寸效应分析与文献中可用的测试数据进行了比较。解决了两种类型的缩放：子层压板级缩放，通过重复次层压板堆叠序列获得，和帘布层缩放，通过改变每个层块的有效厚度来实现。由于获得的结果与实验结果一致，因此成功完成了验证。与实验平均值有可接受的偏差。
