Title: COMPARISON OF VISCOELASTIC/VISCOPLASTIC MODELS FOR DESCRIBING THE CREEP AND RATCHETING BEHAVIORS OF ADHESIVES
Authors: Yi Chen, Lloyd V. Smith
Abstract: Predicting the time-dependent and plastic deformation of adhesives using finite elements is challenging. The accuracy is dependent on the constitutive models while time dependence often leads to complicated mathematic algorithms for finite element coding. This study proposed a nonlinear viscoelastic-viscoplastic constitutive model considering the effect of hydrostatic stress on both yielding and viscoelasticity and damage variables under reversed cyclic load. The model was compared with the linear and nonlinear viscoelastic, and viscoplastic models available in ABAQUS. While the viscoelastic-viscoplastic model is more complicated than other models, only it showed good agreement with the experiment of scarf joints subjected to creep, tensile cyclic, and reversed cyclic loads. Viscoplasticity was recommended when describing the plastic deformation under varying frequencies and long-term load. The effect of hydrostatic stress on yielding and viscoelasticity was essential for predicting the compressive response.
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Conference: SAMPE 2023
Publication Date: 2023/04/17
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