Failure Analysis of the Tube Hydroforming Process Based on Anisotropic Damage Coupling Model

doi:10.3901/JME.2019.18.070

Abstract

Abstract: Hydroforming of Magnesium tubes presents challenges due to its more complex constitutive behavior. Compared to steel, its low thermoplasticity formability brings more issues in experimental and simulation work. Cracking often limits the quality of product during the hydroforming process. Tube hydrofroming experiments along with the finite element analysis, microstructure and mechanical properties of magnesium alloy AZ31B tube hydroforming are investigated to demonstrate the damage evolution during the process. The dangerous area with high risk of failure is predicted. It is found that formability of magnesium alloy AZ31 can be enhanced with elevated temperature range from room temperature to 300℃. Low initial axial feed and then increased simultaneously with the internal pressure can avoid possible overall buckling and wrinkling. To improve the dimension accuracy of the specimens, internal pressure is further increased when the axial feed is eventually exhausted. Based on continuum damage mechanics, a ductile damage model which takes account of anisotropic behavior of magnesium alloy AZ31B is integrated into an explicit finite element frame work and also be validated with experimental work. Insights are provided for the variation of different process parameters related to formed specimens.

Key words: magnesium alloy AZ31B, hydroforming, anisotropic damage, finite element analysis, process parameter

CLC Number:

TG386

WEN Yue, CHEN Zhanghua. Failure Analysis of the Tube Hydroforming Process Based on Anisotropic Damage Coupling Model[J]. Journal of Mechanical Engineering, 2019, 55(18): 70-77.

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