Experimental investigation of PC-films using optical measurements / Christian Dammann in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 2 (05/2014)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIX, N° 2 (05/2014) . - p. 260-271 Titre : Experimental investigation of PC-films using optical measurements Type de document : texte imprimé Auteurs : Christian Dammann, Auteur ; I. Caylak, Auteur ; Rolf Mahnken, Auteur Année de publication : 2014 Article en page(s) : p. 260-271 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anisotropie Contraintes (mécanique) Films plastiques Matériaux -- Déformations géométriques et dimensionnelles Mesures dimensionnelles sans contact Mesures optiques Polycarbonates Index. décimale : 668.9 Polymères Résumé : The alignment of polymer chains is a well known microstructural evolution effect due to straining of polymers. This has a drastic influence on the macroscopic properties of the initially isotropic material. In this work, cold forming is performed at room temperature on a tensile testing machine. Polycarbonate films are examined in two loading phases. In the first phase, the specimen is loaded to induce anisotropy, and in the second, it is re-loaded, while the material direction is varied. The investigations are supported by an optical measurement system to gain knowledge about the inhomogeneous material behavior in the initial loading phase and about the anisotropic homogeneous behavior during the re-loading phase. Two dimensional strain contours are obtained from the test data. Additionally, we propose a method for approximation of the macroscopic true stress and compare the results with a common approach based on volume consistency. In the future, the test data will set a basis for parameter identification of constitutive equations taking into account a combination of inhomogenous and homogenous material behavior, exhibiting strain induced anisotropy. Note de contenu : - SPECIMENS AND TESTING EQUIPMENT : Material and specimen preparation for initial loading - Cut-out specimens for re-loading - Experimental equipment - FUNDAMENTALS FOR EXPERIMENTS ON INDUCED ANISOTROPY WITH OPTICAL MEASUREMENTS : Definitions of kinematics and stresses - Cauchy stress using area approximations with optical measurements - Approximation of Cauchy stress using volume consistency - EFFECT OF VARYING STRAIN-RATES AND MOLAR MASSES - INVESTIGATIONS OF INDUCED ANISOTROPY FOR POLYCARBONATE FILMS : INITIAL AND RE-LOADING : Initial loading - Re-loading - ON DETERMINATION OF THE CAUCHY STRESS : Initial loading - Reloading DOI : 10.3139/217.2848 En ligne : https://drive.google.com/file/d/1_N7bOckKeNiIH_YMh2s-x5jS3xELNmCj/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21321 [article]

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