Journal Published Online: 16 July 2014
Volume 42, Issue 6

Biaxial Ratcheting of Ultra High Molecular Weight Polyethylene: Experiments and Constitutive Modeling



Responses of ultra-high molecular weight polyethylene (UHMWPE) under biaxial cyclic loading were investigated through systematically conducting experiments. Biaxial experiments on UHMWPE tubular specimens were conducted first by prescribing a steady internal pressure followed by a symmetric axial-strain controlled cycle. The steady internal pressure induced a steady nominal circumferential stress, which under the application of the axial strain-controlled cycle, induced circumferential strain ratcheting in the UHMWPE tubular specimens. Experimentally observed ratcheting responses of UHMWPE under biaxial cyclic loading was simulated using one of the unified state variable theories, the viscoplasticity theory based on overstress for polymers (VBOP). To improve the circumferential strain ratcheting simulation of the VBOP model, the Chaboche kinematic hardening rule was implemented in the model. The simulation of the VBOP model with the classical kinematic hardening model was also carried out to demonstrate the current state of the modeling for UHMWPE. Improvement of the circumferential strain ratcheting simulation by the modified VBOP model is demonstrated; however, simulations also indicate that further model modification will be needed.

Author Information

Asmaz, Kerem
Yıldız Technical Univ., Department of Mechanical Engineering, Istanbul, TR
Çolak, Özgen Ü
Yıldız Technical Univ., Department of Mechanical Engineering, Istanbul, TR
Hassan, Tasnim
North Carolina State Univ., Civil, Construction and Environmental Engineering Department, US
Pages: 8
Price: $25.00
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Stock #: JTE20130131
ISSN: 0090-3973
DOI: 10.1520/JTE20130131