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    A continuing investigation into the stress field around two parallet-edge cracks in a finite body

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    etd-tamu-2004C-MEEN-Gilman.pdf (1.099Mb)
    Date
    2005-02-17
    Author
    Gilman, Justin Patrick
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    Abstract
    The goal of this research was to extend the investigation into a method to represent and analyze the stress field around two parallel edge cracks in a finite body. The Westergaard-Schwarz method combined with the local collocation method was used to analyze different cases of two parallel edge cracks in a finite body. Using this method a determination of when two parallel edge cracks could be analyzed as isolated single edge cracks was determined Numerical experimentation was conducted using ABAQUS. It was used to obtain the coordinate and stress information required in the local collocation method. The numerical models were created by maintaining one crack at a fixed length while varying the length of the second crack as well as the separation distance of the two cracks. The results obtained through the local collocation method were compared with the finite element obtained J-Integrals to verify the accuracy of the results. The results obtained in the analysis showed that the major factor in determining when the second crack’s stress field has to be considered was the crack separation distance. It was found that a reduction in the second crack’s length did not have a significant effect on overall stress intensity factors of the fixed crack. A larger change in the opening mode stress intensity factor can be seen by varying the crack separation distance. As well as seeing a steady reduction in shear mode stress intensity factors as the crack separation was increased. The results showed that after a certain crack separation distance the two cracks could be analyzed separately without introducing significant error into the stress field calculations.
    URI
    http://hdl.handle.net/1969.1/1516
    Subject
    Stress Intensity Factors
    J-Integrals
    Parallel
    Cracks
    Collections
    • Electronic Theses, Dissertations, and Records of Study (2002– )
    Citation
    Gilman, Justin Patrick (2004). A continuing investigation into the stress field around two parallet-edge cracks in a finite body. Master's thesis, Texas A&M University. Texas A&M University. Available electronically from http : / /hdl .handle .net /1969 .1 /1516.

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