Jorgen
2007-08-28, 04:09
http://polymerfem.com/polymer_files/topics/hmodel.gif
The Hybrid model (HM) is a newly developed model for predicting the behavior of UHMWPE under arbitrary deformation states. The model is shown in this file (http://www.polymerfem.com/polymer_files/Hybrid_Model1.pdf) to be superior to the many other currently available models.
Constitutive Modeling of UHMWPE Under Large-Deformation and Cyclic Loading Conditions
Abstract: When subjected to a monotonically increasing deformation state, the mechanical behavior of UHMWPE is characterized by a linear elastic response followed by distributed yielding and strain hardening at large deformations. During the unloading phases of an applied cyclic deformation process, the response is characterized by nonlinear recover driven by the release of stored internal energy. A number of constitutitive theories can be used to model these experimentally observed events. We compare the ability of the J2-plasticity theory, the Arruda-Boyce model, the Bergstrom-Boyce model, and the Hasan-Boyce model to reproduce the observed mechanical behavior of UHMWPE. In addition a new Hybrid model is proposed, which incorporates many features of the previous theories. This hybrid model is shown to most effectively predict the experimentally observed mechanical behavior of UHMWPE.
The Hybrid model (HM) is a newly developed model for predicting the behavior of UHMWPE under arbitrary deformation states. The model is shown in this file (http://www.polymerfem.com/polymer_files/Hybrid_Model1.pdf) to be superior to the many other currently available models.
Constitutive Modeling of UHMWPE Under Large-Deformation and Cyclic Loading Conditions
Abstract: When subjected to a monotonically increasing deformation state, the mechanical behavior of UHMWPE is characterized by a linear elastic response followed by distributed yielding and strain hardening at large deformations. During the unloading phases of an applied cyclic deformation process, the response is characterized by nonlinear recover driven by the release of stored internal energy. A number of constitutitive theories can be used to model these experimentally observed events. We compare the ability of the J2-plasticity theory, the Arruda-Boyce model, the Bergstrom-Boyce model, and the Hasan-Boyce model to reproduce the observed mechanical behavior of UHMWPE. In addition a new Hybrid model is proposed, which incorporates many features of the previous theories. This hybrid model is shown to most effectively predict the experimentally observed mechanical behavior of UHMWPE.