Journal
POLYMER TESTING
Volume 68, Issue -, Pages 433-445Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymertesting.2018.02.024
Keywords
Viscoelasticity; Viscoplasticity; Damage model; Stress relaxation; Impact polypropylene
Funding
- SABIC
- King Abdullah University of Science and Technology (KAUST)
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Polymers in general exhibit pressure- and rate-dependent behavior. Modeling such behavior requires extensive, costly and time-consuming experimental work. Common simplifications may lead to severe inaccuracy when using the model for predicting the failure of structures. Here, we propose a viscoelastic-viscoplastic damage model for polypropylene-based polymers. Such a set of constitutive equations can be used to describe the response of polypropylene under various strain-rates and stress-triaxiality conditions. The model can also be applied to a broad range of thermoplastic polymers. The experimental campaign that is needed to identify every parameter of the model accurately is detailed. The proposed model was validated by performing 3-point bending tests at different loading speeds, where the load-displacement response of polypropylene beam up to failure was accurately predicted.
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