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    Strain Field Measurement in Fracture Process Zone

    Source: Journal of Engineering Mechanics:;1990:;Volume ( 116 ):;issue: 011
    Author:
    A. Castro‐Montero
    ,
    S. P. Shah
    ,
    R. A. Miller
    DOI: 10.1061/(ASCE)0733-9399(1990)116:11(2463)
    Publisher: American Society of Civil Engineers
    Abstract: Center‐notched mortar plate specimens are loaded in tension. A multiple sensitivity vector holographic setup is developed to record several deformation stages during the stable crack propagation range. The three‐sensitivity vector setup enables the calculation of both crack opening displacements and strain fields around the crack trajectories. An image analysis system is used to isolate the interferometric effect from the sandwich holograms, resulting in fringe patterns with perfect contrast. Image analysis is also used as a faster, more accurate, and more consistent method for fringe count. After evaluation of the holograms, the existence of tensile forces transmitted through the crack faces is associated with the presence of tensile strain behind the crack tip. A definition of the fracture process zone (FPZ) is proposed based on the difference between experimentally observed and linear elastic fracture mechanics (LEFM) strain fields. Deviations from the linear elastic solution show a relatively small zone of nonlinearity in front of the crack tip and a wake fracture process zone (WFPZ) behind the crack tip. A cohesive crack type of model with a bilinear closing process zone is used to predict the experimental observations.
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      Strain Field Measurement in Fracture Process Zone

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/81486
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    • Journal of Engineering Mechanics

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    contributor authorA. Castro‐Montero
    contributor authorS. P. Shah
    contributor authorR. A. Miller
    date accessioned2017-05-08T22:29:33Z
    date available2017-05-08T22:29:33Z
    date copyrightNovember 1990
    date issued1990
    identifier other%28asce%290733-9399%281990%29116%3A11%282463%29.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/81486
    description abstractCenter‐notched mortar plate specimens are loaded in tension. A multiple sensitivity vector holographic setup is developed to record several deformation stages during the stable crack propagation range. The three‐sensitivity vector setup enables the calculation of both crack opening displacements and strain fields around the crack trajectories. An image analysis system is used to isolate the interferometric effect from the sandwich holograms, resulting in fringe patterns with perfect contrast. Image analysis is also used as a faster, more accurate, and more consistent method for fringe count. After evaluation of the holograms, the existence of tensile forces transmitted through the crack faces is associated with the presence of tensile strain behind the crack tip. A definition of the fracture process zone (FPZ) is proposed based on the difference between experimentally observed and linear elastic fracture mechanics (LEFM) strain fields. Deviations from the linear elastic solution show a relatively small zone of nonlinearity in front of the crack tip and a wake fracture process zone (WFPZ) behind the crack tip. A cohesive crack type of model with a bilinear closing process zone is used to predict the experimental observations.
    publisherAmerican Society of Civil Engineers
    titleStrain Field Measurement in Fracture Process Zone
    typeJournal Paper
    journal volume116
    journal issue11
    journal titleJournal of Engineering Mechanics
    identifier doi10.1061/(ASCE)0733-9399(1990)116:11(2463)
    treeJournal of Engineering Mechanics:;1990:;Volume ( 116 ):;issue: 011
    contenttypeFulltext
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