Fast Plastic Integration Algorithm for Damage Prediction in Forming Process Simulations

Abstract:

The iterative Return Mapping Algorithm (RMA) is widely used for the plastic integration owing to its accuracy and efficiency, but it is CPU time consuming and may cause divergence problems in case of large strain increments. This paper presents a fast plastic integration method called Direct Scalar Algorithm (DSA) for the damage prediction in forming process simulations. A simplified three-dimensional (3D) strain-based damage model is coupled with the plasticity and implemented into the DSA which does not need iterative solution to make the plastic integration very fast and robust even for very large strain increments. The basic idea is to transform the constitutive equations in terms of the unknown stress vectors into a scalar equation in terms of the equivalent stresses which can be determined by using the experimental tensile curve; thus, the plastic multiplier ∆λ can be directly calculated. The DSA is as accurate as RMA but much faster for the plastic integration.

• Periodical: Applied Mechanics and Materials (Volume 784)
• Pages: 342-349
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.784.342
• Online since: August 2015
• Authors: Ali Halouani*, Yu Ming Li, Boussad Abbès, Ying Qiao Guo
• Keywords: Coupled Damage, Coupled Plasticity, Direct Scalar Algorithm of Plasticity, Large Strain Increments, Strain Based Damage Model

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