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This paper describes a numerical inverse method to extract material strength  parameters from the experimental data obtained via mechanical tests at different  strainrates and temperatures. It will be shown that this procedure is  particularly useful to analyse experimental results when the stress-strain  fields in the specimen cannot be correctly described via analytical models. This  commonly happens in specimens with no regular shape, in specimens with a regular  shape when some instability phenomena occur (for example the necking phenomena  in tensile tests that create a strongly heterogeneous stress-strain fields) or  in dynamic tests (where the strain-rate field is not constant due to wave  propagation phenomena). Furthermore the developed procedure is useful to take  into account thermal phenomena generally affecting high strain-rate tests due to  the adiabatic overheating related to the conversion of plastic work. The method  presented requires strong effort both from experimental and numerical point of  view, anyway it allows to precisely identify the parameters of different  material models. This could provide great advantages when high reliability of  the material behaviour is necessary. Applicability of this method is  particularly indicated for special applications in the field of aerospace  engineering, ballistic, crashworthiness studies or particle accelerator  technologies, where materials could be submitted to strong plastic deformations  at high-strain rate in a wide range of temperature. Thermal softening effect has  been investigated in a temperature range between 20°C and 1000°C

Identification of strain-rate and thermal sensitive material model with an inverse method