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김우곤(Woo Gon Kim),류우석(Woo Seog Ryu),김현희(Hyun Hie Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
In order to predict stress intensity limit of high-temperature creep structures, creep work-time equation, defined as Wct^p=B, was used, and the results of the equation were compared with isochronous stress-strain curve(ISSC) ones of ASME BPV NH Code. For this purpose, the creep strain tests with time variations for commercial type 316 stainless steel were conducted with different stresses; 160 MPa150 MPa, 145 MPa, 140 MPa and 135 MPa at 593℃. The results of log Wc and log t plots showed a good linear relation up to 10^5 hr. The constants p, B and stress intensity limit values showed comparatively good agreement to those of ASME NH ISSC. It is believed that the relation can be simply obtained with only several short-term 1% strain data without ISSC which can be obtained by long-term creep data.