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    A Study of Early Stage Self-Loosening of Bolted Joints

    Source: Journal of Mechanical Design:;2003:;volume( 125 ):;issue: 003::page 518
    Author:
    Yanyao Jiang
    ,
    Chu-Hwa Lee
    ,
    Ming Zhang
    DOI: 10.1115/1.1586936
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Both experimental investigation and finite element analysis were conducted to explore the mechanisms for the early stage self-loosening of bolted joints under transverse cyclic loading. The nuts were glued to the bolts using a strong thread locker in the self-loosening experiments to ensure that no backing-off of the nut occurred. Depending on the loading magnitude, the clamping force reduction ranged from 10% to more than 40% of the initial preload after 200 loading cycles. Three-dimensional elastic-plastic finite element analysis was conducted with the implementation of an advanced cyclic plasticity model. The finite element results revealed that the local cyclic plasticity occurring near the roots of the engaged threads resulted in cyclic strain ratcheting. The localized cyclic plastic deformation caused the stresses to redistribute in the bolt, and the result was the gradual loss of clamping force with loading cycles. The finite element results agreed with the experimental observations quantitatively. When the two clamped plates started to slip and the slip displacement was controlled, both experiments and finite element simulations suggested that the friction between the clamped plates has an insignificant influence on the early stage self-loosening.
    keyword(s): Friction , Stress , Thread , Bolted joints , Engineering simulation , Finite element analysis , Plates (structures) , Cycles , Displacement , Force , Plasticity AND Deformation ,
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      A Study of Early Stage Self-Loosening of Bolted Joints

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    http://yetl.yabesh.ir/yetl1/handle/yetl/128809
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    • Journal of Mechanical Design

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    contributor authorYanyao Jiang
    contributor authorChu-Hwa Lee
    contributor authorMing Zhang
    date accessioned2017-05-09T00:10:57Z
    date available2017-05-09T00:10:57Z
    date copyrightSeptember, 2003
    date issued2003
    identifier issn1050-0472
    identifier otherJMDEDB-27757#518_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/128809
    description abstractBoth experimental investigation and finite element analysis were conducted to explore the mechanisms for the early stage self-loosening of bolted joints under transverse cyclic loading. The nuts were glued to the bolts using a strong thread locker in the self-loosening experiments to ensure that no backing-off of the nut occurred. Depending on the loading magnitude, the clamping force reduction ranged from 10% to more than 40% of the initial preload after 200 loading cycles. Three-dimensional elastic-plastic finite element analysis was conducted with the implementation of an advanced cyclic plasticity model. The finite element results revealed that the local cyclic plasticity occurring near the roots of the engaged threads resulted in cyclic strain ratcheting. The localized cyclic plastic deformation caused the stresses to redistribute in the bolt, and the result was the gradual loss of clamping force with loading cycles. The finite element results agreed with the experimental observations quantitatively. When the two clamped plates started to slip and the slip displacement was controlled, both experiments and finite element simulations suggested that the friction between the clamped plates has an insignificant influence on the early stage self-loosening.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleA Study of Early Stage Self-Loosening of Bolted Joints
    typeJournal Paper
    journal volume125
    journal issue3
    journal titleJournal of Mechanical Design
    identifier doi10.1115/1.1586936
    journal fristpage518
    journal lastpage526
    identifier eissn1528-9001
    keywordsFriction
    keywordsStress
    keywordsThread
    keywordsBolted joints
    keywordsEngineering simulation
    keywordsFinite element analysis
    keywordsPlates (structures)
    keywordsCycles
    keywordsDisplacement
    keywordsForce
    keywordsPlasticity AND Deformation
    treeJournal of Mechanical Design:;2003:;volume( 125 ):;issue: 003
    contenttypeFulltext
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