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
In: ISSN: 1385-2000, 2021
Online
academicJournal
Zugriff:
International audience ; 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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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
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Autor/in / Beteiligte Person: | André, Stéphane ; Becker, Simon ; Farge, Laurent ; Delconte, Alain ; Laboratoire Énergies et Mécanique Théorique et Appliquée (LEMTA ) ; Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS) ; Centre de Recherche en Automatique de Nancy (CRAN) |
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Zeitschrift: | ISSN: 1385-2000, 2021 |
Veröffentlichung: | HAL CCSD ; Society for Experimental Mechanics, 2021 |
Medientyp: | academicJournal |
DOI: | 10.1007/s11043-020-09466-w |
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