Analysis of carrying capacity for hydroformed corrugated tubes

Numerical simulation and experiments are carried out to analyze the thickness distribution, forming precision and distribution of residual stress of hydroformed corrugated tubes, and then after different loading experiments and simulation for hydroformed corrugated tubes, to obtain the deformation characteristics, the stress and strain distribution during typical region are analyzed. The results show that there will be a better forming precision with the calibration pressure 290 MPa, and the biggest thinning is 21.63% located at the transition region where there is also the biggest residual stress. When pressure is applied on the inner surface of hydroformed corrugated tubes, the weakest region is at the transition region where there is the biggest equivalent stress. When compressive and tensile load are applied on the end of the hydroformed corrugated tubes, corresponding tensile strain and compressive strain occurred at crest region and nearby, which shows that the hydroformed corrugated tubes have better axial displacement compensation capacity.