Assessment of Pressure Vessels Safety

Conditions of pressure vessels breach are investigated in the present paper. Safety of the modified criteria application of Leak Before Break when a residual stress is found in the vessel material is analysed. Design criterion is based on a critical crack length which must be less than the thickness of the vessel wall. Superposition of residual stress, which occurs in the production of a vessel by impact extrusion, and the hoop stress caused by the internal pressure significantly affects the life and conditions of technical use. Size and character of the distribution of residual stresses were determined experimentally by use of the hole-drilling method. The numerical simulation and mathematical calculations have been carried out applying ANSYS and MATLAB software. The main attention was focused on the application of residual stress in the numerical analysis based on values obtained by the experimental measurements by hole–drilling method