Journal
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
Volume 98, Issue -, Pages 52-61Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijimpeng.2016.08.004
Keywords
HDPE constitutive modelling; Falling weight impact; Finite element analysis; Failure
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Funding
- Ministry of Science, Technology and Productive Innovation, Argentina (MINCyT) [AU/12/08]
- Austrian Federal Ministry of Science, Research and Economy (BMWF) [AR 13/2013]
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We propose a constitutive model to aid in the engineering design of semicrystalline polymer components that may be subjected to biaxial impact loading. To this end, we investigate the thermomechanical and failure behaviour of high density polyethylene (HDPE) under dynamic loading, both experimentally and analytically. We have carried out dynamic tensile tests at 101, 102 and 103 minis displacement rates. Digital image correlation (DIC) and infrared thermography were used to measure full 2D true strain fields and determine specimen temperature rise during tensile testing. The results were used to calibrate the constitutive parameters. To analyse the biaxial impact response, we have carried out falling weight impact (FWI) tests at a 4 m/s impact velocity. We assessed the model prediction capabilities by comparing numerical predictions with experimental results and good agreement was observed. The proposed model, which aims to achieve a compromise between prediction accuracy and formulation simplicity, shows that initial linear elastic response coupled with a temperature-dependent power-law viscoplastic flow element and a non-linear strain-hardening element are sufficient to model biaxial stress scenarios. (C) 2016 Elsevier Ltd. All rights reserved.
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