Determination of material property by hydraulic bulging test

In this paper, finite element method was adopted to establish the sus304 hydraulic bulging test model. A comparison of pressure-displacement curve between the simulation and the test has been done to ensure validity of the FE parameters. Based on the hunch-up of upper holder during the process of bolt clamping, the hypothesis of upper holder geometry that composes of an inclined straight line and an arc was proved to be reasonable. A combination of hydraulic bulging test and finite element analysis to determine the material properties of miniature-specimen has also been proposed. 316L material plastic property is simplified as linear hardening model. The pressure-displacement curves generated by finite element simulations approximate the curves of the test, thus the parameters of yield strength and linear hardening model are inversely resolved. The golden section optimization is used during the optimization process. The material property generated by tensile test was compared with the optimization results.