过渡层特性对金刚石涂层残余应力影响的有限元模拟

nite element simulation of the effects of interlayer properties on residual stresses of diamond coatings-cemented carbide substrate

采用热．力耦合有限元方法对包含过渡层的金刚石涂层一硬质合金基体内的残余应力进行了数值模拟，重点研究了过渡层的特性（弹性模量和热膨胀系数）对金刚石涂层的各应力分量沿界面的最大值的影响。结果表明，随着过渡层弹性模量的增加，径向应力和轴向应力在界面处的最大值均减小，而剪应力的最大值则增大；随着过渡层热膨胀系数的增加，上述各应力分量在界面处的最大值均增大；受过渡层特性影响最敏感的是剪应力。

Based on the thermal-mechanical coupling finite element method, the residual stresses in diamond coatings-cemented carbide substrate with interlayer were simulated. The investigation was put emphasis on the effect of interlayer properties （elastic modulus and thermal expansion coefficient） on every maximum stress component of diamond coatings along the interface. The results show that the maximum radial stress and the maximum axial stress reduce with increasing of elastic modulus of interlayer, while the maximum shear stress increases; the maximum of each stress component increases with increasing of thermal expansion coefficient of interlayer; the most sensitive stress component influenced by interlayer properties is shear stress.