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    Feasibility Study of Thermal Autofrettage of Thick Walled Cylinders

    Source: Journal of Pressure Vessel Technology:;2015:;volume( 137 ):;issue: 006::page 61207
    Author:
    Kamal, S. M.
    ,
    Dixit, U. S.
    DOI: 10.1115/1.4030025
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Thickwalled cylinders such as gun barrels, high pressure containers, and rocket shells are designed to withstand high pressure. The cylinder material may crack if the induced pressure exceeds the material yield strength. Therefore, the thickwalled cylinders are autofrettaged in order to withstand very high pressure in service condition. The most commonly practiced autofrettage processes are hydraulic autofrettage and swage autofrettage. Hydraulic autofrettage involves very high internal pressure at the bore of the cylinder, and in swage autofrettage an oversized mandrel is pushed through the cylinder bore to cause the plastic deformation of the inner wall of the cylinder leaving the outer wall at the elastic state. This results in compressive residual stresses at and around the inner wall of the cylinder, which reduces the maximum stress in the cylinder during next stage of loading by pressurization. Both the processes are well established, but still there are certain disadvantages associated with the processes. The present work proposes a novel method of autofrettage for increasing the pressure carrying capacity of thickwalled cylinders. The method involves only radial temperature gradient in the cylinder for achieving autofrettage. The proposed process is analyzed theoretically for thickwalled cylinders with free ends. The numerical simulations of the process for typical cases and preliminary experiments show encouraging results for the feasibility of the proposed autofrettage process.
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      Feasibility Study of Thermal Autofrettage of Thick Walled Cylinders

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    contributor authorKamal, S. M.
    contributor authorDixit, U. S.
    date accessioned2017-05-09T01:23:15Z
    date available2017-05-09T01:23:15Z
    date issued2015
    identifier issn0094-9930
    identifier otherpvt_137_06_061207.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/159533
    description abstractThickwalled cylinders such as gun barrels, high pressure containers, and rocket shells are designed to withstand high pressure. The cylinder material may crack if the induced pressure exceeds the material yield strength. Therefore, the thickwalled cylinders are autofrettaged in order to withstand very high pressure in service condition. The most commonly practiced autofrettage processes are hydraulic autofrettage and swage autofrettage. Hydraulic autofrettage involves very high internal pressure at the bore of the cylinder, and in swage autofrettage an oversized mandrel is pushed through the cylinder bore to cause the plastic deformation of the inner wall of the cylinder leaving the outer wall at the elastic state. This results in compressive residual stresses at and around the inner wall of the cylinder, which reduces the maximum stress in the cylinder during next stage of loading by pressurization. Both the processes are well established, but still there are certain disadvantages associated with the processes. The present work proposes a novel method of autofrettage for increasing the pressure carrying capacity of thickwalled cylinders. The method involves only radial temperature gradient in the cylinder for achieving autofrettage. The proposed process is analyzed theoretically for thickwalled cylinders with free ends. The numerical simulations of the process for typical cases and preliminary experiments show encouraging results for the feasibility of the proposed autofrettage process.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleFeasibility Study of Thermal Autofrettage of Thick Walled Cylinders
    typeJournal Paper
    journal volume137
    journal issue6
    journal titleJournal of Pressure Vessel Technology
    identifier doi10.1115/1.4030025
    journal fristpage61207
    journal lastpage61207
    identifier eissn1528-8978
    treeJournal of Pressure Vessel Technology:;2015:;volume( 137 ):;issue: 006
    contenttypeFulltext
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