中文摘要：

Based on the thermal kinetic and mass conservation,a series ofcontrolling equations for the finite element are derived and related programs aredeveloped to simulate the damage microcrack healing process controlled by surfacediffusion.Two kinds of typical models for microcrack splitting are proposed,i.e.,thegrain boundary energy existing on the crack surface and residual stresses applying onthe crack surface.And the conditions of microcrack splitting in the two models aregiven as a function of the microcrack aspect ratio.The microcrack with traction-freesurfaces will directly evolve into a spheroid.

英文摘要：

Based on the thermal kinetic and mass conservation, a series of controlling equations for the finite element are derived and related programs are developed to simulate the damage microcrack healing process controlled by surface diffusion. Two kinds of typical models for microcrack splitting are proposed, i.e., the grain boundary energy existing on the crack surface and residual stresses applying on the crack surface. And the conditions of microcrack splitting in the two models are given as a function of the microcrack aspect ratio. The microcrack with traction-free surfaces will directly evolve into a spheroid.