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- Title
Ağır Silah Namlusunun Mekanik Otofretaj İşleminde Gerilme Dağılımının Sayısal Olarak İncelenmesi.
- Authors
Baran, Doğan; Bican, Osman; Doğu, Yahya
- Abstract
Autofrettage process is used to form residual stresses in order to increase the pressure carrying capacity and fatigue life of thickwalled cylinders. These residual stresses counteract some of the stresses during service pressure application and increase the pressure carrying capacity of pressure vessels. Although there are many techniques in practice, swage and hydraulic autofrettage processes have been mostly used in heavy gun barrel production process. In this study, the stresses developed at the end of the swage autofretage process on a heavy gun barrel are numerically calculated by using an FEM (Finite Element Method) program. In FEM analysis, a two-dimensional (2D) axisymmetric model has been used. The FEM model is validated with data from the literature. The Von Mises stress under working pressure for non-autofrettaged barrel is calculated as 1350.3 MPa. The Von Mises equivalent stress for the autofrettaged barrel is 1122.3 MPa at 63% barrel thickness. It is seen that this stress is below the barrel yield strength of 1195 MPa. As a result, there is 16.88% reduction of Von Mises stress for autofrettaged barrel under the working pressure. Thus, the application of autofrettage process on heavy weapon barrels and the calculation of the resulting stresses are critical for barrel life and pressure carrying capacity.
- Subjects
RESIDUAL stresses; PRESSURE; ALTERNATIVE treatment for fatigue; ENGINE cylinders; WEAPON laws
- Publication
International Journal of Engineering Research & Development (IJERAD), 2023, Vol 15, Issue 3, p194
- ISSN
1308-5514
- Publication type
Article
- DOI
10.29137/umagd.1364476