The main objective of the present paper is to provide a simple analytical solution for describing expansion two-layer tube under plane-strain conditions its subsequent use in preliminary design hydroforming processes. Each layer’s constitutive equations are an arbitrary pressure-independent yield criterion, associated plastic flow rule, and hardening law. elastic portion strain neglected. metho...

In this study, an extended stress-based forming limit diagram (FLD) for prediction of necking based on the Marciniak and Kucznski (M-K) model is represented and applied in tube hydroforming. The bulge forming of a straight tube is simulated by finite element method and verified with published experimental data. This adaptive simulation technique is based on the ability to detect the onset an...

.hot metal gas forming of tubes can be used in various industries such as automotive and aerospace industries. in this process tube is formed at elevated temperatures, by using gas instead of fluid pressure. lower required pressure and low power are its advantages in comparison to hydroforming process. in this paper, a hot metal gas bulging process of an aluminum alloy tube has been investigate...

The different branch diameters of five-way tube affect the design loading internal pressure in hydroforming process, where large-diameter is broken more easily than small-diameter one due to same ultimate stress material one-step forming method. Therefore, first four-way and then multi-step (FFTF) method three-way (FTTF) were proposed fabricate 5A02 aluminum alloy with two kinds avoid burst tub...

 Nowadays, light weight and high strength metals are being used in various industries such as automotive and aerospace. Using aluminum-magnesium alloys is an efficient way to reduce the weight of a specific part. These alloys have poor formability in room temperature thus they should be formed at elevated temperature. Warm hydroforming and hot metal gas forming are conventional methods to form ...