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Forming limit diagram (FLD) is a tool which is widely used to measure the material formability of hydroforming process. It is well known that strain based FLD is dependent on strain path which the material undergoes during the course of deformation. This work is based on understanding the deformation and fracture behaviour of as-received (AR) tube and annealed tube during hydroforming process. The strain path is being measured at different locations of the AR tube as well as annealed tube and is co-related with the microhardness value to understand the localization and fracture behaviour. The annealed tube tends to fracture suddenly from the weld line and fracture surface study reveals sudden dominant brittle mode of fracture indicating the impact of weld notch on the fracture process and thus giving lower limiting strains and hardness value.

Study of Fracture Behaviour and Strain Path During Tube Hydrforming Process