RRC 試験の限界拘束応力とインプラント試験の限界応力の関係

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Implant test has following merits : Data on cold cracking susceptibility are easily obtained from small size specimens as compared with self-restrained weld cracking test like Lehigh test, RRC test etc.. Implant test is valuable in economical sense. However, implant test has its inherent disadvantage; several experiments have suggested that it has been apparently difficult to apply directly the critical stress and/or the critical cooling time obtained from implant test to welding procedure in RRC test which is considered as welded joint of real structures. In the present report, attention is forcussed to determine correlation between RRC test and implant test. Firstly implant- and RRC-test are carried out under various conditions of materials and preheat temperatures. Secondly two dimensional finite element method based on elasto-plastic theory is carried out to find out the parameter determing initiation of cold cracking from the standpoint of engineering. The conclusions obtained in this report are summarized as follows : 1. It is concluded from comparison of implant-test results with RRC-test results that the local stress in loading direction at region where cold cracking starts becomes engineering parameter of cold cracking. 2. Correlation between the critical net stress of implant test (σ_<Ipm>)_<cr> and the critical net stress of RRC test (σ_<RRC>)_<cr> is given in following equation from engineering sense stand point [numerical formula] where, (K_t)_<Imp> is stress concentration factor of implant specimen and (K_t)_<RRC> is stress concentration factor of RRC specimen.
社団法人溶接学会の論文
1979-07-05

RRC 試験の限界拘束応力とインプラント試験の限界応力の関係

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