Micromechanics-based damage model for failure prediction in cold forming

The purpose of this study was to develop a micromechanics-based damage (micro-damage) model that was concerned with the evolution of micro-voids for failure prediction in cold forming. Typical stainless steel SS316L was selected as the specimen material, and the nonlinear isotropic hardening rule wa...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2017-04, Vol.690, p.120-131
Main Authors: Lu, X.Z., Chan, L.C.
Format: Article
Language:English
Subjects:
Cold forming
Cold rolling
Cold working
Compressive properties
Computed tomography
Computer simulation
Concentration (composition)
Damage
Damage assessment
Deformation
Failure
Failure prediction
Finite element method
Image reconstruction
Large deformation
Mathematical models
Micromechanics
Micromechanics-based damage model
Predictions
Representative volume element
Stainless steel
Statistical analysis
Strain rate
Studies
Three dimensional models
Voids
X-ray computed tomography
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Summary:The purpose of this study was to develop a micromechanics-based damage (micro-damage) model that was concerned with the evolution of micro-voids for failure prediction in cold forming. Typical stainless steel SS316L was selected as the specimen material, and the nonlinear isotropic hardening rule was extended to describe the large deformation of the specimen undergoing cold forming. A micro-focus high-resolution X-ray computed tomography (CT) system was employed to trace and measure the micro-voids inside the specimen directly. Three-dimensional (3D) representative volume element (RVE) models with different sizes and spatial locations were reconstructed from the processed CT images of the specimen, and the average size and volume fraction of micro-voids (VFMV) for the specimen were determined via statistical analysis. Subsequently, the micro-damage model was compiled as a user-defined material subroutine into the finite element (FE) package ABAQUS. The stress-strain responses and damage evolutions of SS316L specimens under tensile and compressive deformations at different strain rates were predicted and further verified experimentally. It was concluded that the proposed micro-damage model is convincing for failure prediction in cold forming of the SS316L material.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2017.02.069