Abstract:
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Based on the rigid visco plastic FEM technique, this paper numerically simulate the superplastic bulging process of void sensitive materials using pressure controlling strategy of maintaining maximum effective strain rate constant and void damage evolution model of superplastic forming. By examples of free bulging of hemisphere and die bulging of cylinder parts, the optimum pressure cycles are calculated respectively, and the thickness distribution and void volume damage status are also demonstrated. The analysis results are helpful to the process planning in actual superplatic bulging processes.
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