压电材料平面裂纹启裂的能量释放率及电效应

针对压电材料的电弹性断裂问题，考虑到电量对断裂的影响，用裂纹尖端场和裂纹围道积分计算了裂纹沿任意方向启裂的能量释放率。以最大能量释放率为启裂准则，结合PZT-5H压电陶瓷材料。分析了电位移载荷对裂纹启裂的作用效果。研究表明，电位移载荷能促进或抑制裂纹的启裂，并使裂纹产生偏折或分叉，其作用效果与施加的电位移载荷的大小和方向有关。

Energy release rate and electric effects for piezoelectric media with plane crack

Considering rome effects of electric loads on the linear electro-elastic fracture of piezoelectric materials, the energy release rate of the crack during kink initiation process was studied using crack tip fields and the integral around the crack tip. The effects of the electric displacement loading on the crack initiation in a PZT-SH piezoelectric ceramic media were investigated by the theory of maximum energy release rate. According to several numerical examples, the results show that the electric displacement loading Can promote or retard the initiation of crack, and take the form of kink or bifurcation, which will be controlled by the magnitude, direction of the applied electric field.