Material Model Development of Magnesium Alloy and Its Strength Evaluation
Wenjia Huang1,2, Ninshu Ma1, Yunwu Ma1
1Joining and Welding Research Institute, Osaka University, Osaka 567-0047, Japan.
Materials (Basel, Switzerland)
|January 22, 2021
Summary
A novel material model for magnesium alloys accurately predicts crash box deformation. This model integrates slip and twinning phenomena, enhancing simulations for automotive safety applications.
Area of Science:
- Materials Science
- Mechanical Engineering
- Computational Mechanics
Background:
- Magnesium alloys are increasingly used in automotive applications due to their lightweight properties.
- Accurate material modeling is crucial for simulating the behavior of magnesium alloy components under impact loading.
- Existing models may not fully capture the complex hardening mechanisms (slip and twinning/untwinning) in magnesium alloys.
Purpose of the Study:
- To develop and validate a new material model for magnesium alloys that incorporates both slip and twinning/untwinning dominant hardening phenomena.
- To investigate the deformation behavior of magnesium alloy crash boxes under compressive impact loading using the developed model.
- To analyze the influence of various simulation parameters on the predicted deformation characteristics.
Main Methods:
- Development of a new material model combining Hill'48 and Cazacu'06 yield functions.
- Implementation of the material model into LS-DYNA via user subroutine.
- Experimental validation using cyclic load tests and finite element analysis.
- Simulation of magnesium alloy crash box impact using the validated model.
Main Results:
- The new material model accurately predicted the deformation characteristics of magnesium alloy parts when compared to experimental results.
- The model successfully captured both slip-dominant and twinning/untwinning-dominant hardening phenomena.
- Simulations revealed the significant effects of thickness distribution, initial deflection, and contact friction on crash box deformation.
Conclusions:
- The developed material model provides a reliable tool for simulating magnesium alloy behavior under impact.
- The model's ability to include complex hardening mechanisms enhances the accuracy of crashworthiness simulations.
- Further investigations using this model can optimize the design of magnesium alloy automotive components for improved safety.
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