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建立了复合材料加筋板在横向低速冲击载荷作用下的渐进损伤有限元模型。该模型考虑了复合材料加筋板受低速冲击时的纤维断裂、基体开裂及分层脱粘等五种典型的损伤形式,在层内采用应变描述的失效判据,结合相应的材料性能退化方案,通过编写VUMAT用户自定义子程序以实现相应损伤类型的判断和演化。在层间以及筋条与层板间加入界面元,模拟层间区域的情况,结合传统的应力失效判据和断裂力学中的能量释放率准则来判断分层损伤的起始和演化规律。通过对数值模拟结果与实验数据的比较,验证了模型的合理性和有效性。同时探讨了不同位置、不同冲击能量以及含初始损伤(脱粘)等因素对复合材料加筋板低速冲击性能的影响。
A progressive damage finite element model of composite stiffened plate under transverse low speed impact load is established. The model takes into account five typical forms of damage such as fiber fracture, matrix cracking and delamination delamination when the composite stiffened plate is subjected to low velocity impact. The failure criterion of strain description is adopted in the layer. Combined with the corresponding material property degeneration scheme , Through the preparation of VUMAT user-defined subroutine in order to achieve the appropriate damage type judgment and evolution. The interfacial elements are added between the layers and between the ribs and the laminates to simulate the interlayer region. The onset and evolution of delamination damage are judged by combining the traditional stress failure criteria and the energy release rate criterion in fracture mechanics. By comparing the numerical simulation results with the experimental data, the rationality and validity of the model are verified. The effects of different locations, different impact energies and initial damage (debonding) on the low-speed impact properties of composite stiffened plates were also discussed.