SYMPOSIA PAPER Published: 01 January 1974

Stress Analysis of the Compact Specimen Including the Effects of Pin Loading


An improved method of boundary collocation was applied to the two-dimensional stress analysis of the compact specimen. The effects of the pin-loaded holes on stress-intensity factors and crack-opening displacements were investigated for various crack-length-to-specimen-width ratios, hole locations, and internal loadings.

The stress-intensity factors for the “standard” compact specimen under plane-stress or plane-strain conditions were found to be within 1 percent of the stress-intensity factors reported in the ASTM Test for Plane-Strain Fracture Toughness of Metallic Materials (E 399-72) over a range of crack-length-to-specimen-width ratios of 0.4 to 0.7. However, for crack-length-to-specimen-width ratios less than 0.4, the pin-loaded holes (which were not previously accounted for) had a significant effect on stress intensity and crack-opening displacements.

Author Information

Newman, JC
NASA Langley Research Center, Hampton, Va.
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Developed by Committee: E08
Pages: 105–121
DOI: 10.1520/STP33136S
ISBN-EB: 978-0-8031-4645-7
ISBN-13: 978-0-8031-0361-0