Material and structural behaviour of PMMA from low temperatures to over the glass transition: Quasi-static and dynamic loading. (January 2020)

• Record Type: Journal Article
• Authors: Garcia-Gonzalez, D.; Rusinek, A.; Bendarma, A.; Bernier, R.; Klosak, M.; Bahi, S.
• Is Part Of: Polymer testing. Volume 81(2020)
• Publication Date: 2020-01
• Subjects: PMMA -- Impact behaviour -- Polymer -- Constitutive modelling -- Glass transition; Polymers -- Testing -- Periodicals; Polymères -- Tests -- Périodiques; 620.1920287
• DOI: 10.1016/j.polymertesting.2019.106263
• Languages: English
• ISSNs: 0142-9418

Abstract

Abstract: This work aims at characterizing the mechanical behaviour of polymethyl-methacrylate (PMMA) under high velocity impact conditions over a wide range of testing temperatures. To this end, the mechanical response at uniaxial compression is studied for both quasi-static and dynamic conditions covering testing temperatures below, at and above glass transition. A pseudo-brittle to ductile transition in the failure of PMMA is observed at a threshold that depends on testing temperature and strain rate. This analysis allows for the interpretation of the perforation impact tests and to explain the principal deformation and failure mechanisms. To complete the study, the Richeton model to predict yielding is revisited. Finally, we provide a new constitutive model for finite deformations to further identify the deformation mechanisms governing the mechanical behaviour of PMMA and the influence of temperature and strain rate on them. Highlights: Polymer behavior from low to high temperatures at high strain rate. Impact tests and perforation for different initial temperatures. Polymer behavior above the glass transition temperature. Constitutive relation for polymer.