An Inverse Analysis Method Applied to Optimization of Specimen’s Shape for Performing Hot Rapid Crushing Tests from Homogeneous Initial Temperature Field

Résumé

Specific experimental tests with loadings conditions close to those of industrial fast forming
processes as rapid forging, rapid stamping or high speed machining, characterized by large plastic
strains, localized deformations and important gradients of strain rates, strain and temperature, requires to
analyses material flow behavior at different initial temperatures. One of the more important conditions to
obtain intrinsic rheological constitutive equations is to have a quasi-homogenous initial temperature
distribution and especially to keep constant the material microstructure during the specimens heating.
The rapid induction heating seems to be one of the most reliable processes. This scientific study proposes
an inverse analysis technique based on numerical finite element modelling to define on the thermal point
of view, optimal specimen shapes for performing hot rapid crushing tests from homogenous initial
temperature field.