Allowable Stress in Creep Condition
Allowable Stress in Creep Condition
(OP)
Dear All
Can you please help me understand what the difference is between average and minimum stresses in cases 2 and 3 above?
Quote (ASME BPVC II-D MANDATORY APPENDIX 1 1-100)
(b) At temperatures in the range where creep and stress rupture strength govern the selection of stresses, the maximum allowable stress value for all materials is
established by the Committee not to exceed the lowest
of the following:
(1) 100% of the average stress to produce a creep rate of 0.01%/1 000 h
(2) 100Favg% of the average stress to cause rupture at the end of 100 000 h
(3) 80% of the minimum stress to cause rupture at the end of 100 000 h
Can you please help me understand what the difference is between average and minimum stresses in cases 2 and 3 above?





RE: Allowable Stress in Creep Condition
RE: Allowable Stress in Creep Condition
how many tests has to be done and based on which standard or spec those tests are performed?
Do they use extrapolation methods like Larson-Miller?
RE: Allowable Stress in Creep Condition
"Everyone is entitled to their own opinions, but they are not entitled to their own facts."
RE: Allowable Stress in Creep Condition