Thick-walled cylinders play a unique role in military, automobiles, aircraft and oil fields. The autofrettage method is used to increase the fatigue life of thick-walled components like gun barrel, titanium alloy tubes, nuclear reactor vessels, high pressure oil field pipes and LDPE. There are three types of autofrettage processes and hydraulic is the one applied mostly. The autofrettage process uses a pressure that is high enough to plastically deform the bore of the part but not so high that it bursts the component, is applied to the inside of tube. The result is that after the pressure is removed, the elastic recovery of the outer wall put the inner wall into compression, providing a residual compressive stress. In this research paper a study has been carried out to investigate the progress made in different fields by the hydraulic technique and proposals are sought for future work.

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