Machining Analysis of the Autofrettaged Compound Cylinder

Park, Jae-Hyun; Kim, J.H.; Cha, Ki-Up; Hong, Suk-Kyun; Lee, Young-Shin

doi:10.3795/ksme-a.2007.31.7.800

Cited by 7 publications

(6 citation statements)

References 4 publications

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“…The objective of this project is to design, build, and implement a residual stress-calculating GUI that is based on the study of Lee and Park [3][4][5]. Normally, a GUI has two functions: (1) A basic function and (2) an additional function.…”

Section: Gui Development and Program Overviewmentioning

confidence: 99%

“…The analytical formulation on the autofrettaged compound cylinder was adopted from the authors' results from previous studies [3][4][5]. …”

Section: Analysis Procedures [3-5]mentioning

confidence: 99%

“…The Material menu is divided into three parts: (1) geometry shape, (2) material property, and (3) stress ducted using stress equations proposed by Park et al [3][4][5].…”

Section: Materials Menumentioning

confidence: 99%

“…In 1977, Kim and Lee [2] investigated an autofrettage elastic-plastic analysis. In 2007, Lee and Park [3][4][5] studied and analyzed the Bauschinger effect about a compound cylinder. Swardt and Andrews [6] studied the stress analysis of autofrettaged midwall-cooled compound gun tubes in 2006.…”

Section: Introductionmentioning

confidence: 99%

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A residual stress analysis program using a Matlab GUI on an autofrettaged compound cylinder

Yang

Lee

et al. 2009

J Mech Sci Technol

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A program for the residual stress analysis of an autofrettaged compound cylinder is designed using a Matlab graphical user interface (GUI) and program design technique. The high-pressure vessels are autofrettaged in order to increase their operating pressure and fatigue life. An autofrettage process causes plastic expansion of the inner section of the cylinder, adding residual compressive stress to the bore after relaxation. Such a compound cylinder is produced via a shrink-fit procedure that incorporates a monobloc tube that has previously undergone autofrettage. This paper presents a simple and visual tool to calculate the residual stress and describe the distribution of residual stress for both the elastic-perfectly plastic model and the strain-hardening model.

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Section: Gui Development and Program Overviewmentioning

confidence: 99%

“…The analytical formulation on the autofrettaged compound cylinder was adopted from the authors' results from previous studies [3][4][5]. …”

Section: Analysis Procedures [3-5]mentioning

confidence: 99%

“…The Material menu is divided into three parts: (1) geometry shape, (2) material property, and (3) stress ducted using stress equations proposed by Park et al [3][4][5].…”

Section: Materials Menumentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A residual stress analysis program using a Matlab GUI on an autofrettaged compound cylinder

Yang

Lee

et al. 2009

J Mech Sci Technol

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“…Thick-walled cylinders which are subjected to cyclic external or internal high pressure are used in many fields of industry and need to be safe and reliable [1]. These pressure vessels can undergo tensile tangential residual stress which is largest at the bore, therefore crack initiation and propagation could happen.…”

Section: Introductionmentioning

confidence: 99%

A Study on Hydraulic Autofrettage of Thick-Walled Cylinders Incorporating Bauschinger Effect

et al. 2009

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Pressure vessels which are subjected to cyclic external or internal high pressure are used in many fields of industry and need to be sure of reliability and safety. To ensure of reliability and safety, thick-walled cylinder, such as a cannon or nuclear reactor, is autofrettaged to induce advantageous residual stresses. The compressive residual stress which was introduced by autofrettage process acts to offset the tensile residual stress induced by internal pressure. It increases operating pressure and restrains crack initiation and crack propagation. As the autofrettage level increases, the magnitude of compressive residual stress at the bore also increases. However, the Bauschinger effect reduces the compressive residual stresses with prior tensile plastic strain, and decreases the beneficial autofrettage effect. There are some differences between theoretical solution considering elastic-perfectly material behavior and real autofrettage process results. The purpose of the present paper is to predict the accurate residual stress of SNCM 8 high strength steel using the Kendall model which was adopted by ASME Code. The tensile and uniaxial Bauschinger effect tests of SNCM 8 were performed to evaluate Bauschinger effect factor(BEF), thereafter this constant was used in calculating the residual stress. The residual stress distribution which is considering the Bauschinger effect was profiled using Kendall model, and the results were compared with the analytical and Finite Element analysis. The results were found that residual stress incorporating the Bauschinger effect at bore was smaller than ideal calculation. These results should be considered in designing pressure vessels.

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Autofrettage process analysis of a compound cylinder based on the elastic-perfectly plastic and strain hardening stress-strain curve

Lee

Yang

et al. 2009

J Mech Sci Technol

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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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Machining Analysis of the Autofrettaged Compound Cylinder

Cited by 7 publications

References 4 publications

A residual stress analysis program using a Matlab GUI on an autofrettaged compound cylinder

A residual stress analysis program using a Matlab GUI on an autofrettaged compound cylinder

A Study on Hydraulic Autofrettage of Thick-Walled Cylinders Incorporating Bauschinger Effect

Autofrettage process analysis of a compound cylinder based on the elastic-perfectly plastic and strain hardening stress-strain curve

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