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Fatigue crack retardation and closure in polymethylmethacrylate

✍ Scribed by F.J. Pitoniak; A.F. Grandt; L.T. Montulli; P.F. Packman

Publisher: Elsevier Science
Year: 1974
Tongue: English
Weight: 535 KB
Volume: 6
Category: Article
ISSN: 0013-7944
DOI: 10.1016/0013-7944(74)90065-4

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✦ Synopsis

Abstraet-The presented results are from an investigation of crack surface profiles and the influence of intermittent overloads on fatigue crack growth in polymethylmethacrylate, a transparent polymer. Fatigue cracks were grown in compact tension specimens under conditions of constant range in stress intensity factor. Tensile overloads were found to perturb subsequent crack growth in polymethylmethacrylate under certain conditions. Examination of monochromatic light interference fringe patterns emanating from the fatigue cracks indicates that the crack perimeter was closed at zero load. The crack surfaces were displaced, however, in the interior of the specimen at zero load. Measurements of the crack opening displacements during loading revealed that a significant tensile load was required to displace the portions of the crack surfaces which Were initially closed. These observations are discussed in light of the Elber concept of crack closure.

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