A Gradient-Enhanced Damage Model for Viscoplastic Thin-shell Structures
A finite element model of non-local damage viscoplasticity for dynamic analysis of thin-walled shell structures is presented. To take void nucleation and growth into account, a non-local implicit gradient formulation is employed. The free energy function includes both a non-local damage variable on the mid-surface of shell structures and a local one in shell space.Local constitutive laws considering viscoplastic behavior,isotropic hardening and isotropic ductile damage leading tosoftening are used. The performance of the proposed approach is demonstrated through the numerical simulation of shock-wave loaded structures
KeywordsNon-local damage Viscoplasticity Non-linear shells Finite element
Unable to display preview. Download preview PDF.
- 1.FEAP-8.2.k Finite Element Analysis Program. University of CaliforniaGoogle Scholar
- 2.Stoffel, M. An experimental method for validating mechanical models. Habilitation thesis RWTH-Aachen. (2007)Google Scholar
- 4.Dimitrijevic, B.J., Hackl, K.: A method for gradient enhancement of continuum damage models. Tech. Mech. 28(1), 43–52 (2008)Google Scholar
- 17.Nguyen, Q.S., Andrieux, S.: The non-local generalzed standard approach: a consistent gradient theory. Compt. Rend. Meca. 333, 139–145 (2005)Google Scholar