Effect of friction factor on numerical simulation of hot stamping of ultra-thin 316L stainless steel bipolar plate
A high-temperature friction experimental apparatus was constructed to measure the nominal friction factor of ultra-thin 316L stainless steel bipolar plate with thickness of 0.1 mm at five different temperatures.The experimental results indicate that at 200℃,the nominal friction factor of the ultra-thin stainless steel plate is 1.05,which is significantly higher than the friction factor at room tempera-ture(0.29).Based on the experimental results of the friction factor variation with temperature,a finite element model of hot stamping process for the bipolar plate was established.This model incorporated the temperature-dependent friction factor was used to simulate the thickness distribution of microchannels formed after hot stamping of 316L stainless steel bipolar plate with thickness of 0.1 mm.The results show that compared with using the model with constant friction factor,finite element model whose friction factor varies with temperature can more accurately predict the thickness distribution of the microchannel cross-section,and the prediction accuracy is increased by 192%.
hot stamping processfriction factornumerical simulationbipolar plate
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