Scale Effect on the Shrinkage Characteristics of a Spherical Cavity in Stressed Grain

摘要

An analytical method is presented to investigate the scale effect on the shrinkage rate and the healing history of a spherical cavity in a stressed grain. The results show that the scale effect on the shrinkage rate of a spherical cavity in a stressed grain gradually increases as the spherical cavity shrinks. Because of the influence of a small-scale parameter from the nonlocal elastic theory, a spherical cavity in stressed grain does not eliminate completely through only lattice diffusion. The result may give a reference to reveal the healing mechanism of the damage defects in grains under hydrostatic pressures.