Analysis of the HRR Stress Field at the Three-Dimensional Crack TIP : Analysis of CT and CCT Specimens

Abstract

CT specimens with different thicknesses 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 thickness of them are greater 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 less than the recommended value, the HRR field exists only at the center of the specimen. It is shown that there exist no HRR fields in the CCT specimen though the thickness is not small.