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    The Effect of Crack Depth on Elastic-Plastic Fracture Toughness in Blend-Bar Specimens

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    Issue Date
    1989-10
    Author
    Sorem, William A.
    Dodds, Robert H., Jr
    Rolfe, Stanley T.
    Publisher
    University of Kansas Center for Research, Inc.
    Type
    Technical Report
    Is part of series
    SL Report;89-1
    Published Version
    https://iri.ku.edu/reports
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    Abstract
    Short crack test specimens (a/W < < 0.50) are frequently employed when conventional deep crack specimens are either inappropriate or impossible to obtain, for example, in testing of particular microstructures in weldments and in-service structures containing shallow surface flaws. Values of elastic-plastic fracture toughness, here characterized by the crack tip opening displacement (CTOD), are presented for square (cross-section) three-point bend specimens with a/W ratios of 0.15 and 0.50 throughout the lower-shelf and lower-transition regions. Three-dimensional, finite-element analyses are employed to correlate the measured load and crack mouth opening displacement (CMOD) values to the corresponding CTOD values, thus eliminating a major source of experimental difficulty in previous studies of shallow crack specimens. In the lower-transition region, where extensive plasticity (but no ductile crack growth) precedes brittle fracture, critical CTOD values for short crack specimens are significantly larger (factor of 2-3) than the CTOD values for deep crack specimens at identical temperatures. Short crack specimens are shown to exhibit increased toughness at the initiation of ductile tearing and decreased brittle-to-ductile transition temperatures. Numerical analyses for the two a/W ratios reveal large differences in stress fields ahead of the crack tip at identical CTOD levels which verify the experimentally observed differences in critical CTOD values. Correlations of the predicted stresses with measured critical CTOD values demonstrate the limitations of single-parameter fracture mechanics (as currently developed) to characterize the response.
    URI
    http://hdl.handle.net/1808/20403
    Collections
    • Infrastructure Research Institute Scholarly Works [332]
    Citation
    Sorem, W.A., Dodds, R.H., Jr.,​ Rolfe, S., "The Effect of Crack Depth on Elastic-Plastic Fracture Toughness in Bend-Bar Specimens," SL Report 89-1, The University of Kansas Center for Research, Inc., Lawrence, KS, October, 1989, 40 pp.

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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