Forming Prediction of Magnesium Alloy Sheets using a Continuum Damage Mechanics Multistep Inverse Approach
This paper applies multistep inverse approach using a new method to generate the intermediate configurations to analyze the press forming of magnesium alloys. The developed approach considers a final configuration to be formed from a flat blank sheet. It accounts for a series of intermediate configurations that are estimated based on the initial and final configurations as well as tooling conditions using optimization techniques. The approach is based on the concept of minimization of the surface area of the sheet metal subject to the constraints that the punch and die surfaces are not penetrated. Due to the limited formability of magnesium alloys, it is important to realistically estimate the intermediate configurations so that a damage mechanics approach can be explored to predict damage accumulations that can cause rupture of the sheet during forming. Elastic-plastic constitutive laws are used with the modified Hill’s criterion and deformation theory of plasticity to describe the behavior of AZ31 magnesium alloys. Damage is captured by a damage variable that governs the equivalent stress. A damage-plasticity coupled approach is employed for the integration of the constitutive equations. The computed strain increment from two consecutive intermediate configurations is used to predict the resulting damage accumulations during forming. The continuum damage mechanics multistep inverse approach is applied to predict forming of AZ31 magnesium alloys.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 963212
- Report Number(s):
- PNNL-SA-60747; TRN: US0903128
- Resource Relation:
- Conference: Proceedings of ASME 2008 International Mechanical Engineering Congress and Exposition, 14:27-34
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
CONFIGURATION
DEFORMATION
FORECASTING
MAGNESIUM ALLOYS
MECHANICAL ENGINEERING
MINIMIZATION
OPTIMIZATION
PLASTICITY
RUPTURES
STRAINS
SURFACE AREA
Inverse analysis
finite element
press forming
deep drawing
magnesium