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ABSTRACT: Conventional methods for constructing yield loci rely on the assumption that nonlinear strains are permanent strains, which
is not always the case. A nickel-base alloy, SiC fiber-reinforced titanium, an aluminum alloy, and particlereinforced aluminum
have been observed to violate this assumption. We present a method for constructing yield loci using a proof strain criterion
for the permanent strain that relies on cyclic, proportional, probes of the yield surface. Two criteria are implemented: one
for stress reversal and one for yielding. The method is demonstrated by the construction of initial and subsequent yield loci
in the axial-shear stress plane using thin-walled tubular specimens. Results are presented for 6061-T6 aluminum as well as
for 6092/SiC/17.5p-T6, which is 6092 aluminum reinforced with 17.5 volume percent silicon carbide particulate. The centers
of the initial yield loci for the composite are eccentric to the origin of the stress plane most likely because of the residual
stresses induced during processing. Material hardening due to multiaxial stress states can be described by tracking evolution
of the subsequent yield surfaces and here hardening of the particulate composite was primarily kinematic
Experimental Mechanics 04/2012; 44(1):10-20. · 1.52 Impact Factor
