低速冲击作用下碳纤维复合材料铺层板的损伤分析

Low-velocity impact damage analysis in carbon fiber reinforced composite laminated plates

建立了一个有效计算模型,以分析碳纤维复合材料层合板在低速冲击作用下的层内和层间失效行为。针对铺层板的层内损伤,在基于应变描述的Hashin失效准则的基础上,建立了单层板的逐渐累积损伤分析模型;针对铺层板的脱层损伤,建立了各向同性脱层损伤模型,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界面损伤演化规律,并在潜在产生脱层的区域模拟为粘结接触,并将脱层损伤模型作为界面的接触行为。该计算模型通过商用有限元软件ABAQUS/Explicit的用户子程序实现。使用该计算模型对碳纤维增强环氧树脂复合材料层合板在横向低速冲击作用下的损伤和变形行为进行预测分析。数值仿真的结果与试验结果进行了比较,取得了满意的结果,验证了该模型的正确性。

A reliable computational procedure was established for simulating the laminate failure. Employing a strain-based failure criterion, it was modified from Hashin failure criterion as well as the concept of progressive stiffness degradation to model the intralaminar failure. An approach to predict the initiation and propagation of interlaminar damage （delamination） is brought forward based on the contact constraint introduced by the penalty function method： a scalar damage variable is introduced and the degradation of the interface stiffness is established and a damage surface which combines stress-based and fracture-mechanics-based failure criteria is set up to derive the damage evolution law. Both the intralaminar and interlaminar models are implemented into a commercial finite element code, ABAQUS/Explicit, via its user subroutines respectively. Numerical prediction is carried out on carbon-epoxy laminate plates due to transversely low velocity impact. Good agreement between experimental results and numerical results is obtained.