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- W1974446357 abstract "Abstract. This paper presents quasi-static and dynamic tests on circular clamped plates made of aPEHD thermoplastic. A brief review of the main results from a material test programme, involvingtension and compression tests at different rates, is also provided. The results from the material testsare used to identify the coefficients of a recently proposed hyperelastic-viscoplastic constitutivemodel for thermoplastics, also outlined here. Finally, the model is employed in numerical simula-tions of the impact tests. It is shown that the model represents the force-displacement response ofthe experimental tests fairly well. Also, considering the quasi-static tests, a localized failure mechan-ism around the impactor is captured. 1. INTRODUCTIONAmong the different classes of materials, i.e. metals, concrete, wood, polymers etc., few materialsfacethesameworld-wideincreaseindemandanduseaspolymersdo.Animportantreasonforthecurrent growth is that polymers have several attractive properties: they are cheap, easy to form,have low density, and some of them are very ductile. In particular, such materials may haveexcellent energy absorption characteristics. Therefore, polymers are promising for use in severalapplications where other materials, e.g. metals, have been the common choice so far.The experience in using polymers in impact protection systems, however, is limited, and thereare several challenges which call for an in-depth investigation. One of the most obvious is thelack of robust material models in commercial finite element codes, which are essential tools intoday’s engineering design. Material models for polymers should be capable of handling largetemperature and strain-rate effects, deformation-induced anisotropy, viscosity, and other featurescommonly observed for polymers.Development of new material models involves experimental efforts, including material testsand well-defined component tests. Material tests are required for two purposes. Firstly, theyprovide necessary information whose physical features a model should be able to represent.Moreover, material tests are required for calibration of the coefficients in a model. It is quitecommon to validate a proposed material model by doing numerical simulations of the materialtests. A better choice, however, is to perform component tests, applying the calibrated material.These tests serve as an independent check of the capabilities of the model.This paper gives a brief presentation of material tests on a high-density polyethylene (PEHD),see Moura et al. [1] for further details. The results are used to calibrate the constitutive modeldescribed in details by Polanco-Loria et al. [2]. Subsequently, applying the FEM programmeDYMAT 2009 (2009) 1537–1543 EDP Sciences, 2009DOI: 10.1051/dymat/2009217" @default.
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- W1974446357 date "2009-01-01" @default.
- W1974446357 modified "2023-09-22" @default.
- W1974446357 title "Polymer plates subjected to impact: Experimental tests and numerical simulations" @default.
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- W1974446357 doi "https://doi.org/10.1051/dymat/2009217" @default.
- W1974446357 hasPublicationYear "2009" @default.
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