Abstract
Combo-viscoplastic models are phenomological representations of materials exhibiting viscoelastic and elastoplastic behavior. As the name suggests, combo models are formed by using viscoelastic and elastoplastic models as “building blocks” and combining them in a mechanical fashion. A variety of models are possible depending on the arrangement of the building blocks. No new material parameters are introduced. Some attributes of combo models are; (1) flexibility to simulate observed material behavior over a wide range of loading, (2) satisfaction of energy requirements (isothermal assumed), (3) feasible techniques of parameter identification, (4) readily adaptable to general numerical analysis programs. Incremental formulations are developed separately for linear viscoelasticity and elastoplacity and then used to synthesize two basic combo models: viscoelastic/elastoplastic and viscoelastic-plastic. In addition, a finite algorithm is presented to demonstrate how to incorporate the combo-models in a step-by-step solution strategy. Simple results are presented comparing combo-models with experimental creep data for acrylic plastic and sea ice.
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