Determination of design allowable stress intensity of high-temperature structures using 1% creep strain

In order to determine design allowable stress intensity, the creep work(Wc) and time(t) equation defined as Wc tp=B was verified using experimental results. For this purpose, the creep tests for generating 1% strain in 105h for commercial type 316 stainless steel were conducted with different stresses; 160 MPa, 150 MPa, 145 MPa, and 140 MPa at 593 .deg. C. Results between log Wc and log t showed a linear relation well, and the allowable stress intensity value of the Wc - t equation showed good agreement to that of Isochronous Stress-Strain Curves(ISSC) presented on ASME-NH code. The equation can be simply obtained with only several short-term 1% strain data without ISSC