Creep of bent oval tube loaded by internal pressure and a bending moment

Assessing the remaining life of bends of live steam conduits from steel 15Kh1M1F

“…1a in the form of dependences of the load factor n (with respect to the stress causing failure of the bend in the specified time) on the wall thickness in the tension region S t.r . In accordance with [2,4] reliable operation of bends in the specified service time is ensured at n ³ 1.25.…”

“…We determined the rated life using software implementing the method of [2]. With allowance for the results of measurements of the out-of-roundness of bends in operation and after recomputation of these data for the initial state according to [3] it was determined that a o = 6%.…”