The effect of specimen thickness on fracture toughness J//I//c has been investigated with compact tension specimens using the multispecimen R-curve method. HT-9 and A533B-1 steel specimens with thicknesses of 25(1TCT), 10(0. 4TCT), 3, and 0. 5(0. 2TCT) mm were tested. The through-thickness distribution of the plastic energy dissipation or work done within the intense strain region at the crack tip was measured by using a recrystallization-etch technique. Fractographic examinations of the variation of stretch zone width and fracture modes along the specimen thickness were performed. A new J//I//c evaluation procedure for invalid specimen size is proposed using rigid plastic analysis and shear fracture measurements with recrystallizaton-etch or fractographic observations.
|Number of pages||13|
|Journal||Journal of Testing and Evaluation|
|Publication status||Published - 1988 Mar 1|
ASJC Scopus subject areas
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering