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    Elastic-Plastic Fracture at Surface Flaws in HSLA Steel Weldments

    Source: Journal of Offshore Mechanics and Arctic Engineering:;1992:;volume( 114 ):;issue: 004::page 264
    Author:
    D. T. Read
    ,
    B. I. Petrovski
    DOI: 10.1115/1.2919979
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: The combined effects of weld-strength-mismatch and crack size on strength and ductility were studied experimentally using tensile panels. Two high-strength, low-alloy steel base metals were welded with two different electrodes to produce a specimen matrix which contained one each of undermatched, normal-matched, and overmatched welds and one base metal. Two nominal crack sizes were used in two different locations, the weld center and the heat-affected-zone. The basic observable quantities were the strength and ductility of the tensile panels. Measurements of the applied J -integral were performed by instrumenting a contour on the specimen surface with strain gages. It was demonstrated that cracks reduce weld strength in proportion to their area, but that their effect on ductility can be much larger, far out of proportion to the crack area. Overmatched welds were observed to shield cracks from plastic strains when the cracks had a relative area of about 2.5 percent of the cross section; but this effect was lost for cracks with a relative area of 12.6 percent. The J -integral measurements indicated that the differences in behavior among the various weld-strength-mismatch conditions could be explained by the applied J -integral, without the need to invoke differences in fracture resistance. The measured values of fracture resistance, in units of J -integral and crack-mouth-opening-displacement, were comparable for three-point-bend specimens of all the specimen types.
    keyword(s): Steel , Fracture (Process) , Ductility , Welded joints , Measurement , Electrical resistance , Base metals , Electrodes , Heat , Alloys , Displacement AND Strain gages ,
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      Elastic-Plastic Fracture at Surface Flaws in HSLA Steel Weldments

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/110683
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    • Journal of Offshore Mechanics and Arctic Engineering

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    contributor authorD. T. Read
    contributor authorB. I. Petrovski
    date accessioned2017-05-08T23:39:15Z
    date available2017-05-08T23:39:15Z
    date copyrightNovember, 1992
    date issued1992
    identifier issn0892-7219
    identifier otherJMOEEX-28084#264_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/110683
    description abstractThe combined effects of weld-strength-mismatch and crack size on strength and ductility were studied experimentally using tensile panels. Two high-strength, low-alloy steel base metals were welded with two different electrodes to produce a specimen matrix which contained one each of undermatched, normal-matched, and overmatched welds and one base metal. Two nominal crack sizes were used in two different locations, the weld center and the heat-affected-zone. The basic observable quantities were the strength and ductility of the tensile panels. Measurements of the applied J -integral were performed by instrumenting a contour on the specimen surface with strain gages. It was demonstrated that cracks reduce weld strength in proportion to their area, but that their effect on ductility can be much larger, far out of proportion to the crack area. Overmatched welds were observed to shield cracks from plastic strains when the cracks had a relative area of about 2.5 percent of the cross section; but this effect was lost for cracks with a relative area of 12.6 percent. The J -integral measurements indicated that the differences in behavior among the various weld-strength-mismatch conditions could be explained by the applied J -integral, without the need to invoke differences in fracture resistance. The measured values of fracture resistance, in units of J -integral and crack-mouth-opening-displacement, were comparable for three-point-bend specimens of all the specimen types.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleElastic-Plastic Fracture at Surface Flaws in HSLA Steel Weldments
    typeJournal Paper
    journal volume114
    journal issue4
    journal titleJournal of Offshore Mechanics and Arctic Engineering
    identifier doi10.1115/1.2919979
    journal fristpage264
    journal lastpage271
    identifier eissn1528-896X
    keywordsSteel
    keywordsFracture (Process)
    keywordsDuctility
    keywordsWelded joints
    keywordsMeasurement
    keywordsElectrical resistance
    keywordsBase metals
    keywordsElectrodes
    keywordsHeat
    keywordsAlloys
    keywordsDisplacement AND Strain gages
    treeJournal of Offshore Mechanics and Arctic Engineering:;1992:;volume( 114 ):;issue: 004
    contenttypeFulltext
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