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A constitutive model for large multiaxial deformations of solid polypropylene at high temperature
Author(s) -
Sweeney John,
Spares Robert,
Woodhead Mike
Publication year - 2009
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.21426
Subject(s) - materials science , polypropylene , constitutive equation , composite material , finite element method , molding (decorative) , process (computing) , stress (linguistics) , structural engineering , computer science , engineering , linguistics , philosophy , operating system
Experiments on a blow‐molding grade of polypropylene have been performed at 135°C using a biaxial testing machine. Both simultaneous and sequential equibiaxial tests were performed at strain rates relevant to solid phase processing regimes. A constitutive model has been developed that includes a single Eyring process and two Edwards‐Vilgis networks. The effectiveness of this model for predicting the observed stress‐strain behavior is explored. Predictions of simultaneous stretching and the first stretch in sequential experiments are excellent. The second stretch in sequential experiments is less well predicted, but the model's performance is useful overall. The model is incorporated into a commercial finite element code and its practicality is demonstrated. POLYM. ENG. SCI., 2009. © 2009 Society of Plastics Engineers