Abstract
The 25% side-grooved CCT (center-cracked tension) specimens were analyzed elastic-plastically by using the three-dimensional finite element method. The models used in analyses were CCT specimens which were of two thicknesses (B0=18, 4 mm) and 50mm width. The material was the general rolled steel (for structure ). In the case of an 18mm-thick CCT specimen employing [numerical formula]as the effective thickness, the load vs displacement curve of specimen with side-grooves is higher by about 6% than that of a specimen without side-grooves. In the case of a 4mm-thick specimen, the former is higher by about 11% than the latter. The effective of the side-groove is greater on a 4mm-thick specimen than on an 18mm-thick specimen. The J value estimated by Rice's formula using [numerical formula]as the effective thickness nearly coincides with the J value at the central part of the specimen with in about 6% error. It is possible to obtain valid JIC by using the 25% side-grooved 4mm-thick specimen which dose not satisfy the HRR singularity.
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