Autofrettage—Stress distribution under load and retained stresses after depressurization

Theoretical and finite-element modeling of autofrettage process in strain-hardening thick-walled cylinders

“…Eqs. (8) and (9) present these two limit pressures in plane strain while Eqs. (10) and (11) give the limit pressures in plane stress: Table 3 The results of theoretical analysis (PV1, PV2, PV3 and PV4 models) …”

“…Radial and hoop components of stress in plane strain and plane stress for elastic response can be calculated from the following equations also, known as Lame's equations [8]:…”

“…Gao [7] obtained the elasto-plastic solution of a strain-hardening cylinder subjected to internal pressure in plane stress by assuming an isotropic hardening material model (with no Bauschinger effect). Avitzur [8] studied the stress distribution after depressurization of a thick-walled cylinder made of elastic-perfectly plastic material based on the von-Mises and Tresca yield criteria in plane stress and plane strain. Zhu and Yang [9] determined the optimum radius of the elastic-plastic boundary and the optimum autofrettage pressure of a cylinder made of elastic-perfectly plastic material in plane strain.…”

A comparative study of thermal and hydraulic autofrettage

“…The elastic thermal stresses under steady state radial thermal gradient when the entire wall of the cylinder is elastic are given by [27] ( ) ( ) 2 …”

“…As a technology for increasing the pressure carrying capacity and enhancing fatigue life of cylinders, the conventional hydraulic and swage autofrettage have received significant attention of the researchers. Detailed analytical, numerical and experimental analysis of the hydraulic autofrettage has been carried out by many researchers, e.g., [1][2][3][4][5][6]. The analytical solution of the swage autofrettage is difficult due to its transient and localized nature; however, many researchers have investigated the process experimentally and computationally using commercially available finite element packages [7][8][9][10][11].…”