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    Thermomechanical Cracking in the Vicinity of a Near-Surface Void Due to High-Speed Friction Load

    Source: Journal of Tribology:;1988:;volume( 110 ):;issue: 002::page 306
    Author:
    T. Y. Chen
    ,
    F. D. Ju
    DOI: 10.1115/1.3261608
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: This paper discusses the temperature distribution and the stress state in the vicinity of a near-surface rectangular cavity. They occur when the solid is subjected to the Coulomb frictional loading of an asperity moving at moderately high speed. The finite difference method is employed to calculate both the temperature and stress fields. The energy balance method is applied at the corners of the rectangular cavity to resolve the problem of singularities in the temperature field there. The stress singularity at each corner is represented by a special element that is introduced representing the behavior of the known stress singularity at the corner and its surrounding vicinity. Results show that the thermal stress effect dominates the stress field and eventually leads to failure. When a defect, such as a cavity, exists, the stress state that determines the failure phenomenon is more severe and can be quantified depending on the location of the cavity. These results were determined through a numerical computation based on the material properties of Stellite III. However, the parametric effect of material variations including changes in both thermal and mechanical properties were also considered. The study of the cavity location also established the existence of a critical cavity location. This location is defined by the critical ligament thickness (thickness between the wear surface and the top edge of the cavity), at which the cavity-influenced thermal tensile stress reaches a maximum. This thickness is important to designers when cavities at coating/substrate interface are either unavoidable or are too expensive to control in fabrication.
    keyword(s): Stress , Friction , Fracture (Process) , Cavities , Thickness , Corners (Structural elements) , Stress singularity , Failure , Temperature , Coating processes , Coatings , Coulombs , Manufacturing , Energy budget (Physics) , Thermal stresses , Materials properties , Mechanical properties , Finite difference methods , Temperature distribution , Tension , Computation AND Wear ,
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      Thermomechanical Cracking in the Vicinity of a Near-Surface Void Due to High-Speed Friction Load

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    http://yetl.yabesh.ir/yetl1/handle/yetl/104558
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    • Journal of Tribology

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    contributor authorT. Y. Chen
    contributor authorF. D. Ju
    date accessioned2017-05-08T23:28:24Z
    date available2017-05-08T23:28:24Z
    date copyrightApril, 1988
    date issued1988
    identifier issn0742-4787
    identifier otherJOTRE9-28469#306_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/104558
    description abstractThis paper discusses the temperature distribution and the stress state in the vicinity of a near-surface rectangular cavity. They occur when the solid is subjected to the Coulomb frictional loading of an asperity moving at moderately high speed. The finite difference method is employed to calculate both the temperature and stress fields. The energy balance method is applied at the corners of the rectangular cavity to resolve the problem of singularities in the temperature field there. The stress singularity at each corner is represented by a special element that is introduced representing the behavior of the known stress singularity at the corner and its surrounding vicinity. Results show that the thermal stress effect dominates the stress field and eventually leads to failure. When a defect, such as a cavity, exists, the stress state that determines the failure phenomenon is more severe and can be quantified depending on the location of the cavity. These results were determined through a numerical computation based on the material properties of Stellite III. However, the parametric effect of material variations including changes in both thermal and mechanical properties were also considered. The study of the cavity location also established the existence of a critical cavity location. This location is defined by the critical ligament thickness (thickness between the wear surface and the top edge of the cavity), at which the cavity-influenced thermal tensile stress reaches a maximum. This thickness is important to designers when cavities at coating/substrate interface are either unavoidable or are too expensive to control in fabrication.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleThermomechanical Cracking in the Vicinity of a Near-Surface Void Due to High-Speed Friction Load
    typeJournal Paper
    journal volume110
    journal issue2
    journal titleJournal of Tribology
    identifier doi10.1115/1.3261608
    journal fristpage306
    journal lastpage311
    identifier eissn1528-8897
    keywordsStress
    keywordsFriction
    keywordsFracture (Process)
    keywordsCavities
    keywordsThickness
    keywordsCorners (Structural elements)
    keywordsStress singularity
    keywordsFailure
    keywordsTemperature
    keywordsCoating processes
    keywordsCoatings
    keywordsCoulombs
    keywordsManufacturing
    keywordsEnergy budget (Physics)
    keywordsThermal stresses
    keywordsMaterials properties
    keywordsMechanical properties
    keywordsFinite difference methods
    keywordsTemperature distribution
    keywordsTension
    keywordsComputation AND Wear
    treeJournal of Tribology:;1988:;volume( 110 ):;issue: 002
    contenttypeFulltext
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