CONSTRAINED GRAIN BOUNDARY CAVITATION IN A CREEPING BODY CONTAINING A MACROSCOPIC CRACK

摘要: ABSTRACT This paper extends previous models of constrained diffusive grain boundary cavitation under creep conditions to multiaxial states stress. Constitutive equations for cavitating materials are given. In the limiting case where stress on facets is completely relaxed, macroscopic behavior material still nonlinear viscous (but compressible) allowing use C*-integral in crack growth testing. An approximate method determine C* proposed. The transition unconstrained cavity at higher stresses, principle, offsets description but effect strain rate expected be small this range. Therefore departure from and can applied. At very high voids grow primarily by flow matrix. range, a purely becomes increasingly inappropriate.