限界COD値の安定性およびρ^+_c値決定法について

概要

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The three-point bending COD test with clip gauge technique is a promising method of determining the toughness of structural steels in terms of the modern concept of fracture mechanics. The consistency of the critical COD value has been demonstrated by many investigators. The present authors supplement here some information in this aspect of problem, viz. the effect of notch acuity, the thickness insensitivity, comparison between small sized bending test and deeply notched wide plate tension test, and so on. A simple method of converting the critical COD to the value of ρ_c^+ is experimentally established. It is supported by the fact that the critical COD divided by the yield strength is proportional to the fifth power of the absolute temperature. As an example or practical application, the welded-and-notched wide plate tension test is successfully analysed by the ρ_c^+ concept. The ρ_c^+ value used in the analysis is one converted from the critical COD value measured by simple testing.
社団法人日本船舶海洋工学会の論文