Dominant creep failure process in tensile components
Abstract
Two groups of materials, including ductile alloys obeying C*-controlled crack growth and brittle superalloys obeying K-controlled crack growth, were investigated in order to determine the dominant creep failure process under various constant load service conditions. The study is based entirely on experimental information characterizing both the homogeneous creep rupture behavior and the creep crack growth behavior without employing any micromechanical damage models. It is shown that in the case of materials with C*-controlled crack growth, eventual failure is governed by quasi-homogeneous damage accumulation, whereas in the case of materials with K-controlled crack growth, the final failure of structures is likely to be governed by creep crack growth.
- Publication:
-
ASME Journal Engineering Materials and Technology
- Pub Date:
- July 1992
- Bibcode:
- 1992ATJEM.114..255H
- Keywords:
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- Crack Propagation;
- Creep Properties;
- Ductility;
- Failure Analysis;
- Heat Resistant Alloys;
- Brittle Materials;
- Crack Tips;
- Grain Boundaries;
- Micromechanics;
- Structural Mechanics