CFRP弧面结构件钻削工艺参数对材料损伤的影响研究

Research on Influence of Drilling Process Parameters on Material Damage of CFRP Arc Parts

由于CFRP层合板层间剪切强度低,制孔过程中轴向力较大,导致钻入口和钻出口处纤维层容易出现分层现象。为研究CFRP雷达设备舱口盖在钻削制孔过程中的损伤失效情况,利用ABAQUS有限元分析软件建立CFRP弧面板模型,在CFRP层间插入Cohesive单元模拟CFRP分层损伤。基于用户材料定义VUMAT子程序接口,使用FORTRAN语言定义CFRP实体单元的本构模型及失效准则,对小曲率CFRP弧面件的分层损伤和层内基体损伤进行模拟,分析钻头转速及进给量对分层损伤和基体损伤的影响。研究结果表明:钻削制孔时进给量和转速越大,轴向力和扭矩越大,分层损伤和基体损伤越严重。

Due to the low interlaminar shear strength of CFRP laminates and the large axial force during the drilling process,delamination is prone to occur at the fiber layer at the drilling inlet and the fiber layer at the drilling outlet.In order to study the damage and failure of CFRP radar equipment hatch cover during drilling and drilling,ABAQUS finite element analysis software is selected to establish a CFRP arc panel model.Cohesive elements are inserted between CFRP layers to model CFRP delamination damage.Based on the VUMAT subroutine interface defining user materials,the constitutive model and failure criterion of CFRP solid element are defined by FORTRAN language.The delamination damage and matrix damage of small curvature CFRP arc surface parts are simulated,and the effects of bit speed and feed rate on delamination damage and matrix damage are studied.The results show that the larger the feed rate and rotation speed,the greater the axial force and torque,and the more serious the delamination damage and matrix damage.