Research on Loading Path Applied in T-tube Compound Bulging

Finite element mould of T-tube compound bulging was built.Five loading paths were designed according to the law of internal pressure and counter-pressure applied to the tube.The simulated results of the five schemes were separately compared and analyzed,including the variation of stress,strain and thickness at the risk cross-sections.It was found that,a T-tube part with high quality and big branch height will be obtained by increasing the rising velocity of initial internal pressure,delaying and slowing up the counter-pressure's loading.