基于接触算法的复合材料层板脱层损伤分析

针对长纤维增强树脂基复合材料层合板的脱层损伤破坏,提出了基于接触算法的脱层预测模型.在潜在产生脱层区域模拟为粘结接触,并将脱层模型作为界面的接触行为,引入一个损伤变量来表征在达到宏观裂纹之前的微裂纹和微缺陷区域面积,从而获得产生损伤时界面的有效刚度.通过结合传统的应力失效准则和断裂力学中的能量释放率准则定义了损伤发展过程中的损伤面,分析了脱层产生和扩展的整个过程.并将该模型通过ABAQUS/Explicit的用户子程序VUINTER实现.对控制双悬臂梁张开位移率方式下裂纹扩展的数值仿真结果与实验结果进行了比较,取得了满意的结果,验证了该模型的正确性.

Delamination Analysis of Laminated Composites Based on Contact

An approach to predict the initiation and propagation of the delamination in fiber reinforced composite laminated structures was brought forward.The potential delamination area is considered as a bonded contact and the delamination process as contact behavior between the interfaces.A scalar damage variable is introduced and the degradation of the interface stiffness is established.A damage surface which combines stress-based and fracture-mechanics-based failure criteria is set up to derive the damage evolution law.The model is implemented into a commercial finite element code,ABAQUS/Explicit,via its user subroutine VUINTER.Numerical simulations were carried out for problems involving a DCB specimen under different high rate loading.The simulation results agree well with the test results.