Abstract
CT specimens with different thickness and a CCT specimen are analyzed precisely using the three-dimensional finite element method in the elastic-plastic stress states. The stress and displacement fields at the crack tip are compared with the HRR singular stress field and discussed. It is found that in the CT specimens, the thicknesses are larger than those recommended by the standard of fracture toughness testing ; the stress and displacement fields agree very well with those of HRR fields. For the CT specimen, the thickness of which is a little smaller than the mecommednded value, the HRR field exists only on the inside of the specimen. It is shown that there are no HRR fields in the CCT specimen although its thickness is not small.
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