The development of a multiaxial stress rupture criterion for bolting steels using new and service aged materials

Creep rupture tests on uniaxial and notched bar specimens of a variety of g eometries have been performed at 550 degrees C, in order to understand the creep rupture behaviour of new and ex-service Durehete 1055 under multiaxia l stress states. Existing finite element solutions for skeletal point stead y state stresses in the notched bars were used to identify a representative rupture stress. A criterion for governing multiaxial rupture stress was es tablished using the creep rupture data obtained. A good correlation between representative stresses evaluated using the Cane representative stress mod el and uniaxial stresses was produced. In all cases notch strengthening was observed. (C) 2000 Elsevier Science Ltd. All rights reserved.