Theoretical Analysis And Numerical Simulation On Tube Hydroforming

Hydroforming technology is more and more wildly used for the forming of tubular components in automobile, aeronautics& astronautics field with being characteristic of lighter, stiffer and cheaper,The loading path namely relationship between internal pressure vs. time and axial feeding vs. time has vital influence on the result of tube hydroforming. The simulation on tube hydroforming can be used to simulate the forming result of different loading path and reduces the cost of die-testing mostly.This paper investigates the basic theory,technics parameter and finite element method of hydroforming entirely,analyzes the force characteristics of each phase in tube hydroforming,conducts theory analysis by use of yield condition,flow rule and hardening rule,combining with geometry parameter and material parameter of this paper,acquires analytical result of yield limit,loading path respectively, points out the scope of loading route,and establishes the base of theory for subsequent numerical result.Based on the theoretical analysis done hereinbefore,by using explicit finite element software ANSYS/LS-DYNA, analyzes the whole process of tube dydroforming dynamically,obtains flow graph of tube matiral, distributing graph, and issues on the common failure mode such as wrinkling and puckering.Finally,selects some representative loading path.by adjusting the relationship between internal pressure and axial feeding, analyzes numerical result, and gives optimization lodading path.Comprehensive analytical result indicates that as to tube hydroforming, the yield limit,plasticity deformation and loading path obtained from this paper is reasonable,the finite element result is reasonable too,can presents base of theoretical and simulation to hydroforming technics and presents some reference for the industry application of tube hydroforming.