High Temperature Creep Damage Under Biaxial Loading—Part I: Experiments

[+] Author and Article Information
F. Trivaudey, P. Delobelle

Laboratoire de Mécanique Appliquée - URA 279 CNRS, Faculté des Sciences et des Techniques, 25030 Besancon, Cedex, France

J. Eng. Mater. Technol 112(4), 442-449 (Oct 01, 1990) (8 pages) doi:10.1115/1.2903355 History: Received April 18, 1989; Revised December 28, 1989; Online April 29, 2008


The respective influences of the Von-Mises equivalent stress and of the maximum principal stress on the high temperature creep damage of two industrial alloys (INCO 718 and 17–21 SPH stainless steel) are pointed out in a quantitative way through tensile-torsion biaxial tests. Through inversions of the shear component, the important part taken by the principal direction corresponding to the maximum principal stress is also shown. Opposite results are observed according to whether the alloy suffers cyclic hardening as 17-12 SPH does or cyclic softening which is the case of INCO 718. These results are supported by metallographic observations. They demand an anisotropic form for the damage variable D, while besides a time dependence kinetics equation must include the part taken by the strain. The bases of the formulation are described in Part II.

Copyright © 1990 by The American Society of Mechanical Engineers
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