학술논문
Consideration of damage in the analysis of autofrettage of thick-walled pressure vessels
Document Type
Article
Author
Source
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science; December 2016, Vol. 230 Issue: 20 p3585-3593, 9p
Subject
Language
ISSN
09544062
Abstract
In this study, the influence of material damage and the Bauschinger effect on the autofrettage of thick-walled pressure vessels is investigated. Constitutive equations for the elasto-plastic deformation and damage processes are presented. Boundary value problems for a thick-walled cylinder and for a thick-walled sphere of constant thickness are formulated. Computations are preformed to find the optimum autofrettage pressure, for which the equivalent stresses in the vessel take the minimum value under process conditions. Furthermore, residual stress fields after the autofrettage are analyzed. The results show that the Bauschinger effect and damage lead to essential reduction of favorable residual stresses.