Autofrettage process analysis of a compound cylinder based on the elastic-perfectly plastic and strain hardening stress-strain curve |
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Authors: | Eun-Yup Lee Young-Shin Lee Qui-Ming Yang Jae-Hoon Kim Ki-Up Cha Suk-Kyun Hong |
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Affiliation: | (1) BK21 Mechatronics Groups, Dept. of Mechanical Design Engineering, Chungnam National University, 220 Kung-dong Yuseong-gu, Daejeon, 305-764, Korea;(2) Propulsive Group, Agency of Defense Development, Yuseong, P.O. Box 35, Daejeon, 305-301, Korea |
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Abstract: | The autofrettage process enhances the carrying capacity and fatigue lifetime of pressure vessels by increasing their residual
stress. A compound cylinder was introduced in order to increase residual stress. An autofrettaged compound cylinder can resist
a higher pressure than a single cylinder having the same dimension. This residual stress can be measured through experimental
or calculation processes. In this study, residual stress analysis of an autofrettaged compound cylinder was conducted. The
elastic-perfectly plastic and strain hardening models were investigated. The residual stress distribution of the autofrettaged
compound cylinder with shrink fit tolerance was predicted. Shrink fit is a very efficient way to extend compressive residual
stress. The compressive residual stress of the strain-hardening model is smaller than that of the elastic-perfectly plastic
model because of the Bauschinger effect. The compressive residual stress of the strain hardening model decreased by up to
80% overstrain level. |
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