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A scaled boundary finite element method model for interlaminar failure in composite laminates

机译：复合材料层合板层间破坏的比例边界有限元模型

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Triggered by highly localized stress concentrations, failure of layered fibre-reinforced composites may occur in the form of an interface crack emanating from the laminate's free edges. In the present work, this so-called free-edge effect is examined using a scaled boundary finite element method (SBFEM) combined with a coupled stress and energy failure criterion. Focusing on symmetric angle-ply laminates, the SBFEM is formulated for a generalised plane strain state. This allows for a computationally efficient calculation of interface stresses as well as energy dissipation due to delamination of individual plies. For validation purposes, the SBFEM results are compared to analytical reference solutions based on the method of complex potentials. The effective longitudinal stress at failure is determined by means of the coupled stress and energy criterion. The effect of interface strength and toughness as well as the ply-thickness on the laminate's failure stress are discussed in detail. Predictions are validated against experimental findings from literature for different laminate types and layups.
机译：由高度局部的应力集中触发，层状纤维增强复合材料的破坏可能以层压板自由边缘发出的界面裂纹的形式发生。在当前的工作中，使用结合了应力和能量破坏准则的比例边界有限元方法（SBFEM）来检查这种所谓的自由边缘效应。着眼于对称的角铺层层压板，将SBFEM公式化为广义的平面应变状态。这允许计算有效地计算界面应力以及由于各个层的分层而导致的能量耗散。为了进行验证，将SBFEM结果与基于复势方法的分析参考溶液进行比较。失效时的有效纵向应力通过耦合的应力和能量准则确定。详细讨论了界面强度和韧性以及层厚对层压板破坏应力的影响。可以根据文献针对不同层压板类型和铺层的实验结果对预测进行验证。

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