A model for anisotropic viscoelastic damage in composites

• DOI: 10.1016/j.compstruct.2009.10.020
• Publication Date: 2009-10-18T08:08:20Z
• Authors: R.C. Pavan; B.F. Oliveira; S. Maghous; G.J. Creus
• Keywords: Elasticity; Hardening (computing)

A model for continuous damage combined with viscoelasticity is proposed. The starting point is the formulation connecting the elastic properties to the tensor of damage variables. A hardening law associated with the damage process is identified from available experimental information and the rate-type constitutive equations are derived. This elastic damage formulation is used to formulate an internal variable approximation to viscoelastic damage in the form of a non-linear Kelvin chain. Elastic and viscoelastic equations are implemented into a finite element procedure. The code is verified by comparison with closed-form solutions in simplified configurations, and validated by fitting results of experimental creep tests.