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    A Finite Element Analysis of the Stress Intensity Resulting from Single-Edge Pre-Cracked Beam Loading Conditions

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    Authors
    Kibble, Kevin A.
    Turner, D.
    Issue Date
    2001
    
    Metadata
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    Abstract
    The single-edge precracked-beam (SEPB) fracture toughness method has been investigated using finite element methods to analyze the stress intensity (K1) resulting from variations in bridge span, punch length, and virtual crack length. A two-dimensional half-plane, semi-infinite model was used to approximate the stress intensity from a fit of the nodal displacements of a crack face under SEPB loading conditions. The finite element method models the crack in situ, using six-node triangular elements specified around a singular point that simulates the crack tip. The analysis reveals that for increasing virtual crack length (), the stress intensity increases to a maximum where / = 0. With further increasing virtual crack length, the stress intensity decreases. The inflection point differs for varying span and fixed punch length, and for varying punch lengths with fixed span. The resulting stress intensities per new ton force loading are presented in tabular and graphical form. The presented series of graphs can be used to explore variations in precracking parameters. This finite element analysis provides useful data for those developing or adopting the SEPB fracture toughness measurement technique.
    Citation
    Journal of Testing and Evaluation, 29(3): 285-292
    Publisher
    ASTM International
    Journal
    Journal of Testing and Evaluation
    URI
    http://hdl.handle.net/2436/29606
    DOI
    10.1520/JTE12257J
    Additional Links
    http://www.astm.org/DIGITAL_LIBRARY/JOURNALS/TESTEVAL/PAGES/1766.htm
    Type
    Journal article
    Language
    en
    Description
    Presented is a finite element analysis (FEA) that provides data for those developing or adopting the single-edge pre-cracked beam (SEPB) fracture toughness technique. The analysis gives the stress intensity (K1) resulting from variations in bridge span, punch length, and virtual crack length. The resulting stress intensities per Newton force loading are presented in tabular and graphical form, which can be used to explore variations in pre-cracking parameters and thus arrive at the optimum test geometry and the manufacture of the correct test tooling.
    ISSN
    0090-3973
    ae974a485f413a2113503eed53cd6c53
    10.1520/JTE12257J
    Scopus Count
    Collections
    Faculty of Science and Engineering

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