(to be submitted for journal publication)
G.H. Paulino
Department of Civil and Environmental Engineering, University of Illinois
at Urbana-Champaign, Newmark
Laboratory, 205 North Mathews Avenue,
IL, 61801, USA
Y. Liu
Department of Mechanical Engineering, Aeronautical Engineering & Mechanics,
Rensselaer Polytechnic Institute, Troy, NY 12180
Abstract
This paper presents a non-linear boundary element formulation and corresponding
implementation for elasto-viscoplasticity using the consistent tangent operator (CTO)
concept, and considering both kinematic and isotropic hardening. When viscoplastic
deformation occurs, the effective stresses in the non-linear region is allowed to exceed
the loading surface, and the purely plastic theory is not suitable for this situation.
Therefore, this paper investigates the viscoplastic problem, and presents a novel
implicit viscoplastic algorithm using the CTO concept within a boundary element framework.
Relevant numerical examples are provided, which validate the present model. Conclusions are inferred and potential extensions of this work are discussed.
Key words: elasto-viscoplastic material, plasticity, consistent tangent operator, boundary element method (BEM)