Thermal fatigue simulation and optimization of composite crucible for melting magnesium alloy

LIN Xu-qiang， SHI Wei-jie， PAN Bai-song
（College of Mechanical Engineering， Zhejiang University of Technology， Hangzhou 310014， China）

Abstract： In order to increase fatigue life of composite crucible，the crucible thermal fatigue，based on finite element methood（FEM） and Halford-Marrow equation，was simulated and analyzed. On this basis，the influence on thermal fatigue by the chamfer around the geometrical mutation，inner and outer layer material thickness were studied by extreme difference analysis. At last， the design optimization of thermal fatigue life for composite crucible  was realized. The result shows that fatigue risk areas are located at the corner of the outer crucible，and that crucible flange chamfer has great effect on the crucible fatigue life，the fatigue life can be increased by increasing inner layer thickness or reducing the outer layer thickness.
Key words： composite crucible； finite element methood（FEM）； Halford-Marrow； fatigue life of thermal