SEDL / STP / STP1060-EB / STP23433S

Measurements of CTOD and CTOA Around Surface-Crack Perimeters and Relationships Between Elastic and Elastic-Plastic CTOD Values

Reuter, WG
Principal engineer and senior engineer, Idaho National Engineering Laboratory, EG&G Idaho, Inc., Idaho Falls, ID

Lloyd, WR
Principal engineer and senior engineer, Idaho National Engineering Laboratory, EG&G Idaho, Inc., Idaho Falls, ID

Pages: 25    Published: Jan 1990

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Abstract

A difficulty associated with predicting structural integrity is that the surface cracks found in structural components are three-dimensional whereas the crack-tip opening displacement (CTOD) and J-integral analytical techniques were derived from two-dimensional theory. This paper provides data from specimens containing surface cracks (aspect ratio either 0.1 or 0.5 and crack depth-to-thickness ratio 0.6); presents measured values of CTOD, crack-tip opening angle (CTOA), and Δa; provides experimental results relative to the center of rotation and the use of the Newman-Raju solutions for predicting the variation in CTOD around the crack perimeter; and evaluates possible correlations between CTOD, CTOA, and Δa.