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    Development of a Multiaxial Fatigue Damage Model for High Strength Alloys Using a Critical Plane Methodology

    Source: Journal of Engineering Materials and Technology:;2008:;volume( 130 ):;issue: 004::page 41008
    Author:
    Matthew Erickson
    ,
    Robert H. Van Stone
    ,
    Peter Kurath
    ,
    Alan R. Kallmeyer
    DOI: 10.1115/1.2969255
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: The prediction of fatigue life for metallic components subjected to complex multiaxial stress states is a challenging aspect in design. Equivalent-stress approaches often work reasonably well for uniaxial and proportional load paths; however, the analysis of nonproportional load paths brings forth complexities, such as the identification of cycles, definition of mean stresses, and phase shifts, that the equivalent-stress approaches have difficulties in modeling. Shear-stress based critical-plane approaches, which consider the orientation of the plane on which the crack is assumed to nucleate, have shown better success in correlating experimental results for a broader variety of load paths than equivalent-stress models. However, while the interpretation of the ancillary stress terms in a critical-plane parameter is generally straightforward within proportional loadings, there is often ambiguity in the definition when the loading is nonproportional. In this study, a thorough examination of the variables responsible for crack nucleation is presented in the context of the critical-plane methodology. Uniaxial and multiaxial fatigue data from Ti–6Al–4V and three other alloys, namely, Rene’104, Rene’88DT, and Direct Age 718, are used as the basis for the evaluation. The experimental fatigue data include axial, torsional, proportional, and a variety of nonproportional tension/torsion load paths. Specific attention is given to the effects of torsional mean stresses, the definition of the critical plane, and the interpretation of normal stress terms on the critical plane within nonproportional load paths. A new modification to a critical-plane parameter is presented, which provides a good correlation of experimental fatigue data.
    keyword(s): Stress , Shear (Mechanics) , Cycles , Fatigue , Alloys , Fatigue damage AND Torsion ,
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      Development of a Multiaxial Fatigue Damage Model for High Strength Alloys Using a Critical Plane Methodology

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    http://yetl.yabesh.ir/yetl1/handle/yetl/138058
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    contributor authorMatthew Erickson
    contributor authorRobert H. Van Stone
    contributor authorPeter Kurath
    contributor authorAlan R. Kallmeyer
    date accessioned2017-05-09T00:28:10Z
    date available2017-05-09T00:28:10Z
    date copyrightOctober, 2008
    date issued2008
    identifier issn0094-4289
    identifier otherJEMTA8-27111#041008_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/138058
    description abstractThe prediction of fatigue life for metallic components subjected to complex multiaxial stress states is a challenging aspect in design. Equivalent-stress approaches often work reasonably well for uniaxial and proportional load paths; however, the analysis of nonproportional load paths brings forth complexities, such as the identification of cycles, definition of mean stresses, and phase shifts, that the equivalent-stress approaches have difficulties in modeling. Shear-stress based critical-plane approaches, which consider the orientation of the plane on which the crack is assumed to nucleate, have shown better success in correlating experimental results for a broader variety of load paths than equivalent-stress models. However, while the interpretation of the ancillary stress terms in a critical-plane parameter is generally straightforward within proportional loadings, there is often ambiguity in the definition when the loading is nonproportional. In this study, a thorough examination of the variables responsible for crack nucleation is presented in the context of the critical-plane methodology. Uniaxial and multiaxial fatigue data from Ti–6Al–4V and three other alloys, namely, Rene’104, Rene’88DT, and Direct Age 718, are used as the basis for the evaluation. The experimental fatigue data include axial, torsional, proportional, and a variety of nonproportional tension/torsion load paths. Specific attention is given to the effects of torsional mean stresses, the definition of the critical plane, and the interpretation of normal stress terms on the critical plane within nonproportional load paths. A new modification to a critical-plane parameter is presented, which provides a good correlation of experimental fatigue data.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleDevelopment of a Multiaxial Fatigue Damage Model for High Strength Alloys Using a Critical Plane Methodology
    typeJournal Paper
    journal volume130
    journal issue4
    journal titleJournal of Engineering Materials and Technology
    identifier doi10.1115/1.2969255
    journal fristpage41008
    identifier eissn1528-8889
    keywordsStress
    keywordsShear (Mechanics)
    keywordsCycles
    keywordsFatigue
    keywordsAlloys
    keywordsFatigue damage AND Torsion
    treeJournal of Engineering Materials and Technology:;2008:;volume( 130 ):;issue: 004
    contenttypeFulltext
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