The contact interactions include a pair of interactions that define the weld interface between the pipes, which is identified in.

Stress data when the strain rate equals zero are also defined to be the same as the stress data at strain rate 1.0 10 5 s 1.Īs a result of large deformation, thermal expansion is not considered in the material model. In the material model definition an extreme case of stress data is defined when the strain rate is 1.0 10 6 s 1. A special adjustment in the flow stress at high strain rates is necessary to avoid divergence during the iteration procedure of the nonlinear solution. Above this temperature the Mises flow stress is highly sensitive to variations in temperature and strain rate.

For the loading in this model, these material parameters result in the onset of local plastic flow only after the interface temperature has exceeded roughly 1200C, near the material solidus temperature of 1250C. A similar model is defined in Abaqus as a rate-dependent perfectly plastic material model. The material model defined for this example approximates the high-temperature behavior of Astroloy, where it is reported by Soucail et al. (1992) using a Norton-Hoff constitutive law to describe the temperature and strain-rate viscoplastic behavior.

Abaqus welding interface cracker