1. What have the authors contributed in "Modelling, identification and application of phenomenological constitutive laws over a large strain rate and temperature range" ?
A review of the different phenomenological thermo-viscoplastic constitutive models often applied to forging and machining processes is presented.. Three models in this class have also been studied.. Coupling between the effects of strain rate and temperature is introduced.
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2. What are the three categories of stress–strain models?
Stress–strain constitutive models fall into three categories: empirical models, semi-empirical models and models incorporating physical phenomena.
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3. What is the effect of the strain rate on the deformation of the steel?
The investigation of the material behaviour of the 42CrMo4-BA steel over a large range of strain rates and temperatures, for two loading modes (i.e. compression and shear), highlighted the existence of three deformation domains (cold, semi-hot and hot deformation) that can be defined by certain temperature ranges.
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4. What is the common reason why the number of tests needed for the identification is so high?
In the literature, the ‘‘cost’’ of a model is often related to the number of parameters which increases the number of tests needed for the identification.
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