碳纤维复合材料单向板钻孔分层损伤的数值模拟

Numerical Simulation of Delamination Damage during Drilling Carbon Fiber Reinforced Plastic Unidirectional Plate

基于三维Hashin失效准则,以及双线性Cohesive损伤模型中的二次名义应力准则和BK失效准则,采用ABAQUS/Explicit模块中的VUMAT子程序对碳纤维复合材料单向板钻孔过程中的分层损伤进行模拟,并通过钻孔后的超声C扫结果对模拟结果进行了验证;研究了麻花钻的半径和顶角对分层损伤的影响。结果表明:试验得到钻孔后单向板损伤区域的最大破坏直径为25.6mm,分层因子为2.56,有限元模拟得到的最大破坏直径为25mm,层因子为2.50,试验结果与模拟结果的相对误差仅为2.4%,证明了有限元模型的准确性;与上表面铺层界面和中间界面相比,单向板下表面铺层界面的分层因子最大,分层损伤最严重;分层因子随麻花钻的直径和顶角的增大而增大,分层损伤程度也增大。

Based on three-dimensional Hashin failure criterion,and quadratic nominal stress criterion and BK failure criterion of the bilinear Cohesive damage model,the delamination damage of carbon fiber reinforced plastic unidirectional plate during drilling was simulated by VUMAT subroutine in ABAQUS/Explicit module,and the simulation results were verified by the ultrasonic C scan results after drilling.The effect of diameter and vertex angle of twist drill on delamination damage was studied.The results show that the tested maximum damage diameter of damage area of unitirectional plate after drilling was 25.6 mm,and the delamination factor was 2.56;the maximum damage diameter was 25 mm,and the delamination factor was 2.50 by finite element simulation.The relative error between experimental results and simulation results was only 2.4%,proving the accuracy of the finite element model.Compared with the top surface layer interface and intermediate interface,the delamination factor of the lower surface layer interface of unidirectional plate was the largest,and the delamination damage was the severest.The delamination factor increased with the increase of diameter and vertex angle of twist drill,and the delamination damage degree also increased.