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2 Journal of Theoretical and Applied Mechanics

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Mechanical analysis of autofrettaged high pressure apparatus

Zhu R., Zhu G., Mao A.

Journal of Theoretical and Applied Mechanics

2017

Vol. 55 nr 1

17--27

High pressure apparatus is widely used in industries, the design of them depends on stress distributions in their walls. Most of high pressure apparatuses are made in form of cylinders. To raise load-bearing capacity and extend operation life for high pressure apparatus, the autofrettage technology is often used. To design autofrettaged high pressure apparatus, it is necessary to study characteristics of stresses in the wall of thick-wall cylinders, including residual stresses and total stresses, etc. In this study, through investigating the characteristics of stresses of cylinders subjected to internal pressure according to the maximum distortion strain energy theory, a set of simplified equations for residual stresses and total stresses are obtained, the safe and optimum load-bearing conditions for autofrettaged cylinders are found out, which are the basis for design of autofrettaged high pressure apparatus.

Inquire into the marvellousness of autofrettage for mono-layered cylinders

Zhu R., Li Q

Journal of Theoretical and Applied Mechanics

2014

Vol. 52 nr 2

359--372

With the help of the equation of optimum overstrain or depth of the plastic zone, a set of concise and accurate equations for residual stresses and their equivalent stress as well as the total stress and their equivalent stresses are obtained, and features of these stresses are discussed, thereupon the law of distribution and the varying tendency of these stresses become clearer. Safe and optimum load-bearing conditions for a cylinder are presented.