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A study of methodological nature demonstrates the efficiency of a probationtest allowing for the intrinsic character of a rheological constitutive law tobe assessed. Such a law is considered here for Semi-Crystalline Polymersexhibiting necking and for large deformation. In the framework of a$(\dot\sigma, \sigma, \dot\varepsilon, \varepsilon)$ behavior's law, tensileexperiments conducted at an imposed constant strain rate $\dot\varepsilon_0$bring true stress responses from which constitutive (material) parameters canbe identified from Model-Based Metrology concepts. The same experiment repeatedat various strain rates gives then access to the dependence of the non-elasticparameters on the strain rate. Then the intrinsic law is tested severely byconsidering a new set of experiments carried out for constant displacementrates of the grips. In that case, the specimens show local strain rates whichevolve strongly during the test (by a factor of 5-10 here). The parameteridentification process requires then the introduction of the exact realizedinput strain and strain-rate command into the model. Accounting for strain ratedependency requires additionally the knowledge of the preliminary identifiedstrain rate dependence of the non-elastic constitutive parameters for goodpredictions of the experimental response directly. This is what is proven here.The conclusion speaks in favor of a possible upgrade of international standardsfor the mechanical characterization of polymers based on constant strain-ratetensile tests and properly applied model-based metrology.

Certifying the intrinsic character of a constitutive law for semi-crystalline polymers: a probation test