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Journal Articles (Review Article) Mechanics of Time-Dependent Materials Year : 2021

Certifying the intrinsic character of a constitutive law for semicrystalline polymers: a probation test

Certifier du caractère intrinsèque d'une loi constitutive pour les polymères semi-cristallins : un test de probation

Abstract

A study of methodological nature demonstrates the efficiency of a probation test allowing for the intrinsic character of a rheological constitutive law to be assessed. Such a law is considered here for Semi-Crystalline Polymers exhibiting necking and for large deformation. In the framework of a (, ,,) behavior's law, tensile experiments conducted at an imposed constant strain rate 0 bring true stress responses from which constitutive (material) parameters can be identified from Model-Based Metrology concepts. The same experiment repeated at various strain rates gives then access to the dependence of the non-elastic parameters on the strain rate. Then the intrinsic law is tested severely by considering a new set of experiments carried out for constant displacement rates of the grips. In that case, the specimens show local strain rates which evolve strongly during the test (by a factor of 5-10 here). The parameter identification process requires then the introduction of the exact realized input strain and strain-rate command into the model. Accounting for strain rate dependency requires additionally the knowledge of the preliminary identified strain rate dependence of the non-elastic constitutive parameters for good predictions of the experimental response directly. This is what is proven here. The conclusion speaks in favor of a possible upgrade of international standards for the mechanical characterization of polymers based on constant strain-rate tensile tests and properly applied model-based metrology.
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Dates and versions

hal-04314145 , version 1 (29-11-2023)

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Stéphane André, Simon Becker, Laurent Farge, Alain Delconte. Certifying the intrinsic character of a constitutive law for semicrystalline polymers: a probation test. Mechanics of Time-Dependent Materials, 2021, 25 (4), pp.645-661. ⟨10.1007/s11043-020-09466-w⟩. ⟨hal-04314145⟩
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