The results show that the stress intensity factor depends only on the mechanical loading, while the electric displacement intensity factor depends only on the electric loading for impermeable cracks.

• 无论平片裂纹的形状如何，结果都表明：对不可导通裂纹，应力强度因子只与机械载荷有关，电位移强度因子只与电载荷有关；