Effect of fracture surface interference on shear crack growth

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A joint analytical-experiment program to investigate the effect of fracture surface interference on shear modes of crack growth is progressing satisfactorily. A general two-dimensional, boundary element model has been formulated by the group at Ohio State University that is capable of calculating the effective Mode I and Mode II stress intensity factors for flat or curved cracks with small scale yielding. The model can calculate K{sub I} and K{sub II} for an arbitrary constitutive law for displacement of the crack faces. The constitutive law proposed in our earlier work is being used in the new boundary element model. The experimental ... continued below

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Pages: (9 p)

Creation Information

Gross, T.S.; Watt, D.W. (New Hampshire Univ., Durham, NH (United States). Dept. of Mechanical Engineerng) & Mendelsohn, D.A. (Ohio State Univ., Columbus, OH (United States). Dept. of Engineering Mechanics) February 1, 1992.

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Description

A joint analytical-experiment program to investigate the effect of fracture surface interference on shear modes of crack growth is progressing satisfactorily. A general two-dimensional, boundary element model has been formulated by the group at Ohio State University that is capable of calculating the effective Mode I and Mode II stress intensity factors for flat or curved cracks with small scale yielding. The model can calculate K{sub I} and K{sub II} for an arbitrary constitutive law for displacement of the crack faces. The constitutive law proposed in our earlier work is being used in the new boundary element model. The experimental portion of the effort at UNH was to use an as-yet undeveloped electro-optic holographic interferometry (EOH) system to measure the crack face displacement field while the crack is loaded in shear. The algorithms for obtaining the interferograms have been developed, the testing machine modifications necessary for interferometric measurements are complete, and interferograms of specimens under load have been obtained. Techniques for digitizing the fracture surface profile have been developed and preliminary numerical experiments have been conducted to determine the {Delta}K dependence of fracture asperity interference on an actual crack.

Physical Description

Pages: (9 p)

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  • Other: DE92011431
  • Report No.: DOE/ER/45433-1
  • Grant Number: FG02-90ER45433
  • DOI: 10.2172/5477506 | External Link
  • Office of Scientific & Technical Information Report Number: 5477506
  • Archival Resource Key: ark:/67531/metadc1093499

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  • February 1, 1992

Added to The UNT Digital Library

  • Feb. 10, 2018, 10:06 p.m.

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  • Feb. 26, 2018, 1:41 p.m.

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Gross, T.S.; Watt, D.W. (New Hampshire Univ., Durham, NH (United States). Dept. of Mechanical Engineerng) & Mendelsohn, D.A. (Ohio State Univ., Columbus, OH (United States). Dept. of Engineering Mechanics). Effect of fracture surface interference on shear crack growth, report, February 1, 1992; United States. (digital.library.unt.edu/ark:/67531/metadc1093499/: accessed April 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.