Numerical and experimental analysis of superplastic-like uniaxial tensile necking of coarse-grained LY-12

摘要

In this work, numerical and experimental studies of superplastic-like uniaxial tensile behavior of coarse-grained LY-12 have been performed. Larger tensile elongation to fracture is observed and several necks are exhibited at 10~(-1) and 10~(-4) s~(-1) respectively although not very clearly. Chaboche viscoplastic constitutive equations are used and implemented in a finite element code to simulate the process of necks formation and development before fracture during uniaxial tension. The simulated characteristics of more than one necks along the specimens help to obtain large elongation, which is in agreement with experimental observations. Local strain rate distribution as the function of strain can explain how and when microscopic necks take place.