Abstract

A constitutive damage model is proposed in order to investigate the crushing response of crossply and $0^{°}$ plies composite laminates, using a VUMAT subroutine implemented in ABAQUS/Explicit. This damage model predicts five failure modes commonly observed in unidirectional (UD) carbon fibres reinforced composite structures: fibre failure in tension, fibre failure in compression, matrix cracking in tension, matrix cracking in compression and in-plane shear failure. Its formulation is based on an energy framework which combines stress-based fracture mechanics and damage mechanics approaches within a unified way, enabling the prediction of the five failure modes aforementioned in terms of damage initiation and damage propagation. In this work a new fibre kink formulation is proposed taking into account the stresses degradation on the matrix fracture plane inside the kinking band. An experimental test campaing is proposed for verification of the numerical models. Additional comparisons between predictions obtained using the proposed model and experimental results taken from the open literature are also presented and discussed. An overall good correlation between numerical predictions and experimental data, taken from literature and in-house experimental results for wedge-shaped tip composite, was obtained.

摘要

提出了一种本构损伤模型，以研究交叉层的破碎响应和$0^{°}$plies 复合层压板，使用在 ABAQUS/Explicit 中实现的 VUMAT 子程序。该损伤模型预测了在单向 (UD) 碳纤维增强复合材料结构中常见的五种失效模式：纤维受拉失效、纤维受压失效、基体受拉开裂、基体受压开裂和面内剪切失效。其公式基于一个能量框架，该框架将基于应力的断裂力学和损伤力学方法以一种统一的方式结合起来，从而能够预测上述五种失效模式的损伤起始和损伤扩展。在这项工作中，考虑到扭结带内基体断裂平面上的应力退化，提出了一种新的纤维扭结公式。为了验证数值模型，提出了一个实验测试campaing。还介绍并讨论了使用所提出的模型获得的预测与来自公开文献的实验结果之间的其他比较。获得了数值预测和实验数据之间的总体良好相关性，这些数据取自文献和楔形尖端复合材料的内部实验结果。