Biaxial Cyclic Hardening of Annealed Copper Cylinders Evaluated by Deformation Plasticity Theories.
Final rept. 1 Nov 73-31 Oct 74,
ILLINOIS UNIV AT URBANA-CHAMPAIGN DEPT OF THEORETICAL AND APPLIED MECHANICS
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Hollow and solid circular cylinders of annealed OFHC copper were subjected to cyclic proportional strain histories. The stress-strain histories for different strain paths were correlated on the basis of Tresca and Mises effective stresses and strains, and the correlations using Tresca definitions were shown to be more representative than those of Mises. However, a deformation plasticity theory corresponding to the Tresca yield condition and Tresca effective stresses and strains did not lead to accurate predictions of the stress histories. The predictive capability of a simplified plasticity theory, which assumed that proportional straining leads to proportional stressing, was evaluated. Although this simplifying assumption was not in qualitative agreement with experimental results, its accurate characterization of the load-torque histories of solid cylinders suggests that the greater computational effort required by the constitutive equations of incremental plasticity might not be justifiable for some cyclic proportional straining situations. Author
- Metallurgy and Metallography