SEDL / STP / STP743-EB / STP28817S

Relationship Between Critical Stretch Zone Width, Crack-Tip Opening Displacement, and Fracture-Energy Criterion: Application to SA-516-70 Steel Plates

Nguyen-Duy, P
Scientist, Materials Sciences Directorate, Institut de Recherche d'Hydro-Québec (IREQ), Varennes, Québec

Pages: 10    Published: Jan 1981

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Abstract

Relationships are developed between the crack-tip opening displacement (CTOD), fracture-energy criterion (J^Ic), and critical stretch zone width (W^SZc) using a simple geometrical model of the crack tip. Stretch zone width is directly measured from micrographs of fracture surfaces.

For three-point-bend specimens of SA-516-70 steel, J^Ic evaluated from measured values of W^SZc is equal to 0.173 MJ-m⁻² compared with 0.200 MJ-m⁻² determined from the single-specimen method in which the crack onset point is detected by the electrical potential method.