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Residual stiffness in cross-ply laminates subjected to cyclic loading

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Title: Residual stiffness in cross-ply laminates subjected to cyclic loading
Authors: Taheri-Behrooz, Fathollah1, Shokrieh, Mahmood M.1 shokrieh@iust.ac.ir, Lessard, Larry B.2
Source: Composite Structures. Oct2008, Vol. 85 Issue 3, p205-212. 8p.
Subjects: Material fatigue, Strains & stresses (Mechanics), Shear (Mechanics), Laminated materials
Abstract: Abstract: A new approach has been developed to evaluate the residual stiffness of cross-ply laminates under tensile fatigue loading. In the present research, a stiffness degradation model is generalized by using a new fatigue life measure and shear-lag analyses to improve correlation at low fatigue cycles and high stress states. The developed model is integrated into a progressive approach to predict the transverse stiffness degradation of 30° unidirectional plies made of AS4/3501-6 carbon/epoxy under both constant and variable amplitude cyclic tensile loading. Also, the stress history in 0° and 90° plies and transverse stiffness degradation in 90° plies of a cross-ply laminate are predicted by using the developed model. The generalized model, in contrast to original one, is capable of simulating stiffness reduction under high stress states where failure occurs in transverse plies of a cross-ply laminate during the first cycles of the fatigue loading. Predicted results by the model show a good correlation with the experimental data. [Copyright &y& Elsevier]
Copyright of Composite Structures is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 32504065
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Residual stiffness in cross-ply laminates subjected to cyclic loading
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  Data: <searchLink fieldCode="AR" term="%22Taheri-Behrooz%2C+Fathollah%22">Taheri-Behrooz, Fathollah</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Shokrieh%2C+Mahmood+M%2E%22">Shokrieh, Mahmood M.</searchLink><relatesTo>1</relatesTo><i> shokrieh@iust.ac.ir</i><br /><searchLink fieldCode="AR" term="%22Lessard%2C+Larry+B%2E%22">Lessard, Larry B.</searchLink><relatesTo>2</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Composite+Structures%22">Composite Structures</searchLink>. Oct2008, Vol. 85 Issue 3, p205-212. 8p.
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  Data: <searchLink fieldCode="DE" term="%22Material+fatigue%22">Material fatigue</searchLink><br /><searchLink fieldCode="DE" term="%22Strains+%26+stresses+%28Mechanics%29%22">Strains & stresses (Mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Shear+%28Mechanics%29%22">Shear (Mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Laminated+materials%22">Laminated materials</searchLink>
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  Label: Abstract
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  Data: Abstract: A new approach has been developed to evaluate the residual stiffness of cross-ply laminates under tensile fatigue loading. In the present research, a stiffness degradation model is generalized by using a new fatigue life measure and shear-lag analyses to improve correlation at low fatigue cycles and high stress states. The developed model is integrated into a progressive approach to predict the transverse stiffness degradation of 30° unidirectional plies made of AS4/3501-6 carbon/epoxy under both constant and variable amplitude cyclic tensile loading. Also, the stress history in 0° and 90° plies and transverse stiffness degradation in 90° plies of a cross-ply laminate are predicted by using the developed model. The generalized model, in contrast to original one, is capable of simulating stiffness reduction under high stress states where failure occurs in transverse plies of a cross-ply laminate during the first cycles of the fatigue loading. Predicted results by the model show a good correlation with the experimental data. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
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  Group: Ab
  Data: <i>Copyright of Composite Structures is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.compstruct.2007.10.025
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      – Code: eng
        Text: English
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        PageCount: 8
        StartPage: 205
    Subjects:
      – SubjectFull: Material fatigue
        Type: general
      – SubjectFull: Strains & stresses (Mechanics)
        Type: general
      – SubjectFull: Shear (Mechanics)
        Type: general
      – SubjectFull: Laminated materials
        Type: general
    Titles:
      – TitleFull: Residual stiffness in cross-ply laminates subjected to cyclic loading
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            NameFull: Taheri-Behrooz, Fathollah
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            NameFull: Shokrieh, Mahmood M.
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            NameFull: Lessard, Larry B.
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              M: 10
              Text: Oct2008
              Type: published
              Y: 2008
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