CCT試験片のJ積分評価式の解析的検討 : 第1報, Riceらおよび大路らの評価式の検討

概要

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Rice has shown a simplified method for estimating the J-integral for several specimens. Rice formulas have been derived based on the assumption of a deep crack. Ohji has also shown a simplified method for estimating the J-integral from the same assumption. For a CCT specimen, the J-value of the Ohji formula is equal to zero for a linear elastic material. In this study, the necessity of a deep crack for these J estimation formulas and the cause of the above-mentioned irrationality of the Ohji formula for a CCT specimen are analytically studied for two materials; rigid perfectly-plastic and strain hardening plastic. Results show that the assumption of a deep crack is not required necessarily for a rigid perfectly-plastic material and for a strain hardening plastic material when L/W=3 in case of using a load-point displacement and is required for n<3 when a mouth opening displacement is used. Results also show that the Ohji formula is equal to the plastic part of the Rice formula. Based on the results, the Ohji formula for a CCT specimen should be used when the strain hardening exponent is known.
1989-01-25