INVESTIGADORES
FRONTINI patricia Maria
artículos
Título:
Deformation and failure of semicrystalline polymers under dynamic tensile and biaxial impact loading
Autor/es:
JUAN P TORRES; PM FRONTINI; MARTÍN MACHADO; ZOLTAN MAJOR
Revista:
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Lugar: Amsterdam; Año: 2016
ISSN:
0734-743X
Resumen:
We propose a constitutive model to aid in the engineering design of semicrystalline polymer componentsthat may be subjected to biaxial impact loading. To this end, we investigate the thermomechanicaland failure behaviour of high density polyethylene (HDPE) under dynamic loading, both experimentallyand analytically.We have carried out dynamic tensile tests at 101, 102 and 103 mm/s displacement rates.Digital image correlation (DIC) and infrared thermography were used to measure full 2D true strain fieldsand determine specimen temperature rise during tensile testing. The results were used to calibrate theconstitutive 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 numericalpredictions with experimental results and good agreement was observed. The proposed model,which aims to achieve a compromise between prediction accuracy and formulation simplicity, showsthat initial linear elastic response coupled with a temperature-dependent power-law viscoplastic flowelement and a non-linear strain-hardening element are sufficient to model biaxial stress scenarios.