A procedure for determining the true stress–strain curve over a large range of strains using digital image correlation and finite element analysis

Strain-based modeling of fatigue crack growth – An experimental approach for stainless steel

“…The strain at the crack tip became larger than that corresponding to the tensile strength defined in the nominal stress. The stress-strain relation above the nominal tensile strength was obtained using hourglass shaped specimens and a sophisticated testing procedure [34]. In this procedure, the digital image correlation technique was applied to monitor the change in strain at the minimum section of the curved surface and the stress during the test was estimated by iterative finite element analyses.…”

“…In this procedure, the digital image correlation technique was applied to monitor the change in strain at the minimum section of the curved surface and the stress during the test was estimated by iterative finite element analyses. The detailed testing procedure was described elsewhere [34]. Fig.…”

Elastic-plastic failure assessment of cold worked stainless steel pipes

“…(2) was almost constant regardless of the degree of cold working [13,22]. Therefore, the stressestrain curve of hardened stainless steel could be identical to that of non-cold worked material by changing the constant ε o [13,22]. It was deduced that this characteristic of the stressestrain curves led to the identical FACs of Fig.…”

“…In order to simulate a large deformation in the vicinity of the crack tip for deriving the J-integral, it is necessary to obtain the true stressestrain curve after necking. Then, the curve after necking was obtained by the specified procedure using the digital image correlation (DIC) technique, which is referred to as the IFD (Iteration FEA procedure based on DIC measurement) method [13]. The strain and stress at the root of the necking portion were identified by strain measurement using the DIC technique and by iteration of the FEA, respectively.…”

Strain localization during tensile Hopkinson bar testing of commercially pure titanium and Ti6Al4V titanium alloy

“…Strain rate effect on modulus, yield, ultimate strength, strain to failure and on the in-plane shear properties was studied. Results of tensile tests obtained using digital image correlation method may be used to determine stressstrain curve including post-necking strain [8]. Hourglass type specimens were used for tensile tests, and the stressstrain curves were identified through an iteration process using finite element analysis.…”