Corrado Giuseppe, Arteiro Albertino, Marques António Torres, Daoud Fernass, Glock Florian
DEMec, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, s/n, 4200-465 Porto, Portugal.
Stress Methods and Optimisation, Airbus Defence and Space GmbH, 85077 Manching, Germany.
Polymers (Basel). 2024 Jun 11;16(12):1659. doi: 10.3390/polym16121659.
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.
本文提出了一种复合材料的细观损伤模型，并通过预测无缺口碳纤维增强聚合物（CFRP）层合板的尺度效应，在试件层面进行了验证。所提出的材料模型提出了一种修正的纵向损伤定律，该定律在预测纵向压缩破坏机制的起始和扩展时考虑了复杂三维应力状态的影响。为了预测单向CFRP的横向破坏机制，该模型随后与三维摩擦弥散裂纹模型相结合。完整的细观损伤模型在ABAQUS/Explicit中实现。使用实体单元预测层内损伤的起始和扩展，并根据铺层的位置和有效厚度使用不同的材料卡片包含原位特性。使用粘结单元捕捉分层。为了验证所实现的损伤模型，将准各向同性无缺口试件在拉伸和压缩载荷下的尺寸效应分析与文献中可用的试验数据进行了比较。研究了两种类型的尺度效应：通过重复子层合板堆叠顺序获得的子层合板级尺度效应，以及通过改变每个铺层块的有效厚度实现的铺层级尺度效应。由于获得的结果与实验结果一致，且与平均实验值的偏差可接受，因此成功完成了验证。
