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    A Model for the Determination of Residual Fatigue Life of a Nickel-Based Superalloy

    Source: Journal of Engineering Materials and Technology:;2008:;volume( 130 ):;issue: 003::page 31010
    Author:
    Duyi Ye
    ,
    Jinyang Zheng
    DOI: 10.1115/1.2931148
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: In this paper, both the dissipation of the plastic-strain energy and the exhaustion of the static toughness during high-temperature low-cycle fatigue of GH4145/SQ superalloy were investigated. Together with the analysis of the microscopic aspects of the material, an energy-based damage mechanics model was developed for the prediction of the residual fatigue life of the high-temperature fastened parts in power plant. Experimental results show that the static toughness is a parameter that is highly sensitive to the fatigue damage process. The deterioration of the static toughness during fatigue process reveals the exhaustion of the materials’s ability to absorb energy, which is essentially associated with the irreversible energy dissipation process of the fatigue failure. Based on the dissipation of the plastic-strain energy and the exhaustion of the static toughness during fatigue, a damage variable is defined that is consistent with the fatigue damage mechanism. The variable is sensitive to the fatigue process and can be measured with a simple experimental procedure. A fatigue damage evolution equation is derived on the basis of Lemaitre’s potential of dissipation in the framework of continuum damage mechanics. Furthermore, an equation for the determination of the residual fatigue life is deduced. The fatigue damage mechanics model is verified by comparing the predicted results with the experimental observations. The fatigue damage mechanics model developed may provide a feasible approach to determining the residual fatigue life of the high-temperature fastened parts in power plant.
    keyword(s): Superalloys , Energy dissipation , Cycles , Equations , Fatigue damage , Fatigue life , Toughness , Fatigue failure , Fatigue AND High temperature ,
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      A Model for the Determination of Residual Fatigue Life of a Nickel-Based Superalloy

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    http://yetl.yabesh.ir/yetl1/handle/yetl/138072
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    contributor authorDuyi Ye
    contributor authorJinyang Zheng
    date accessioned2017-05-09T00:28:11Z
    date available2017-05-09T00:28:11Z
    date copyrightJuly, 2008
    date issued2008
    identifier issn0094-4289
    identifier otherJEMTA8-27109#031010_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/138072
    description abstractIn this paper, both the dissipation of the plastic-strain energy and the exhaustion of the static toughness during high-temperature low-cycle fatigue of GH4145/SQ superalloy were investigated. Together with the analysis of the microscopic aspects of the material, an energy-based damage mechanics model was developed for the prediction of the residual fatigue life of the high-temperature fastened parts in power plant. Experimental results show that the static toughness is a parameter that is highly sensitive to the fatigue damage process. The deterioration of the static toughness during fatigue process reveals the exhaustion of the materials’s ability to absorb energy, which is essentially associated with the irreversible energy dissipation process of the fatigue failure. Based on the dissipation of the plastic-strain energy and the exhaustion of the static toughness during fatigue, a damage variable is defined that is consistent with the fatigue damage mechanism. The variable is sensitive to the fatigue process and can be measured with a simple experimental procedure. A fatigue damage evolution equation is derived on the basis of Lemaitre’s potential of dissipation in the framework of continuum damage mechanics. Furthermore, an equation for the determination of the residual fatigue life is deduced. The fatigue damage mechanics model is verified by comparing the predicted results with the experimental observations. The fatigue damage mechanics model developed may provide a feasible approach to determining the residual fatigue life of the high-temperature fastened parts in power plant.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleA Model for the Determination of Residual Fatigue Life of a Nickel-Based Superalloy
    typeJournal Paper
    journal volume130
    journal issue3
    journal titleJournal of Engineering Materials and Technology
    identifier doi10.1115/1.2931148
    journal fristpage31010
    identifier eissn1528-8889
    keywordsSuperalloys
    keywordsEnergy dissipation
    keywordsCycles
    keywordsEquations
    keywordsFatigue damage
    keywordsFatigue life
    keywordsToughness
    keywordsFatigue failure
    keywordsFatigue AND High temperature
    treeJournal of Engineering Materials and Technology:;2008:;volume( 130 ):;issue: 003
    contenttypeFulltext
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