A nonproportional strain-controlled load path consisting of two segments was applied to the cobalt-based alloy Haynes 188 at 650°C. The first segment was purely axial; the axial strain was then held constant while the shear strain was increased during the second segment. The alloy exhibited about a 95-percent reduction in axial stress (298 to 15 MPa) during shear straining. This reduction was due primarily to plastic coupling, but time-dependent stress relaxation also occurred. A rate-independent plasticity model approximated the stress reduction due to plastic coupling reasonably well, but as expected was unable to account for time-dependent stress relaxation. A viscoplasticity model capable of predicting the interaction between stress relaxation and plastic coupling also predicted the plastic coupling reasonably well. The accuracy of the viscoplastic model is shown to depend greatly upon the set of nonunique material parameters, which must be characterized from a sufficiently large range of load histories.
Plastic Coupling and Stress Relaxation During Nonproportional Axial-Shear Strain-Controlled Loading
Contributed by the Pressure Vessels and Piping Division and presented at the Pressure Vessels and Piping Conference, Seattle, Washington, July 23–27, 2000, of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS. Manuscript received by the PVP Division, January 2000; revised manuscript received October 23, 2000. Editor: S. Y. Zamrik.
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Lissenden, C. J., Arnold, S. M., and Saleeb, A. F. (October 23, 2000). "Plastic Coupling and Stress Relaxation During Nonproportional Axial-Shear Strain-Controlled Loading ." ASME. J. Pressure Vessel Technol. February 2001; 123(1): 81–87. https://doi.org/10.1115/1.1344883
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