SEDL / STP / STP803V1-EB / STP37311S

Evaluation of Plate Specimens Containing Surface Flaws Using J-Integral Methods

Reuter, WG
Senior engineering specialist, and engineer, Materials Technology Division, EG&G Idaho, Inc., Idaho Falls, Idaho

Chung, DT
Senior engineering specialist, and engineer, Materials Technology Division, EG&G Idaho, Inc., Idaho Falls, Idaho

Eiholzer, CR
engineer, Materials Technology Division, EG&G Idaho, Inc., Idaho Falls, Idaho

Pages: 23    Published: Jan 1983

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Abstract

Using annealed Type 304 stainless steel plate specimens containing ellipsoidal, rectangular, or triangular-shaped surface flaws, critical values of J are calculated for three separate situations: (1) the assumption that the specimen consists of a single-edge notch (SEN) and two unflawed specimens, (2) the prediction of an equivalent-length through-thickness defect for the surface flaw, and (3) the use of an equation developed by Paris. It was concluded that J^init (Charpy specimen) and J^Ic cannot be used to successfully predict structural integrity using any of the three approaches for the 6.4-mm-thick (0.25-in.) annealed Type 304 stainless steel.

Since it was not possible to develop a comparison between the absolute values of J^init (from the surface-flawed specimen) and J^Ic, an attempt was made to evaluate a possible relative agreement. Values of J^init and J^pen from only those specimens containing rectangular-shaped defects were used to calculate ΔJ/Δα. The average values agree reasonably well with those obtained in the open literature.