复合材料层合板低速冲击损伤的预测模型

在低速冲击载荷作用下,建立了一种适用于铺层总数较多的复合材料层合板的损伤预测模型。采用三维Puck失效准则预测层内纤维与基体的破坏,并获得基体失效时的断裂面角度。根据低速冲击下复合材料层合板的层间分层损伤机理,同时考虑面内横向正应力、厚度方向正应力、层间剪应力和相邻铺层的损伤状态等因素对界面分层的影响,发展了一种新的冲击分层失效准则。为快速有效地预测铺层总数较多的复合材料层合板的冲击损伤,通过对单元积分点处的应变进行线性插值,提出了在单个实体单元内预测多个铺层损伤的数值计算方法。模型成功预测了受冲击层合板具体的失效模式,预测的分层形状和尺寸与试验值吻合较好,并显著减少了有限元模型的规模,表明本文所发展的数值方法对预测复合材料层合板低速冲击损伤的有效性。

Damage Prediction Model for Composite Laminates Subjected to Low Velocity Impact

A method is developed to pred ict numerically the damage of composite laminates with more plies under low velo city impact loading. The Puck criterion for 3D stress states is adopted to mode l the intralaminar damage including matrix cracking and fiber breakage, and to o btain the orientation of the fracture plane due to matrix failure. According to interlaminar delamination mechanism, a new delamination criterion is proposed. The influence of transverse and through-thickness normal stress, interlaminar sh ear stress and damage conditions of adjacent plies on delamination is considere d. In order to quickly and efficiently predict the impact-induced damage of composite laminates with mor e plies, an approach, which can predict the specific dam age of several plies in a single solid element, is proposed by interpolation on the strains of element integration points. Moreover, the proposed model can pre dict specific failure modes. A good agreement between the predicted delamination shapes and sizes and the experimental results shows correctness of the develope d numerical method for predicting low velocity impact damage on composite laminates.