On acquiring true stress–strain curves for sheet specimens using tensile test and FE analysis based on a local necking criterion

Hyun, Hong Chul; Kim, Minsoo; Bang, Sungsik; Lee, Hyungyil

doi:10.1557/jmr.2014.24

Cited by 25 publications

(9 citation statements)

References 20 publications

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“…A standard procedure for the determination of trues stress and the true strain was used: = (1 + ), = (1 + ), where and are true stress and true strain, respectively, and are engineering stress and engineering strain, respectively. This approach is correct if the specimen deforms uniformly without neck formation [30,31]. In situ observations of the specimens during high-temperature tensile deformation showed that at elongations lower than 300% (~1.4), specimens deformed uniformly.…”

Section: Resultsmentioning

confidence: 99%

On the Superplastic Deformation in Vanadium-Alloyed High-Nitrogen Steel

Астафурова¹,

Moskvina²,

Panchenko³

et al. 2019

Metals

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The experimental evidence for the realization of a superplastic behavior with 900% elongation in V-alloyed high-nitrogen austenitic Fe-19Cr-22Mn-1.5V-0.3C-0.6N steel was proposed. Using thermomechanical processing, a misoriented grain/subgrain austenitic microstructure with a high density of deformation-assisted defects and precipitates was developed in the steel. During high-temperature tensile deformation in a temperature interval from 850 to 1000 • C and strain-rate range from 4 × 10 −4 s −1 to 6 × 10 −3 s −1 , this microstructure demonstrated the characteristics of superplastic flow: elongation in the interval 400-900%, strain-rate sensitivity exponent m = 0.40-0.49, grain boundary sliding mechanism. The maximum elongation to failure (900%) was reached at deformation temperature 950 • C and strain rate 4 × 10 −4 s −1 .precipitation hardening [24][25][26][27]. Despite the visible advantages of the high-nitrogen austenitic steels as a construction material, there is limited data related to the possibility of realization of superplastic flow in them. Padmanabhan [1] mentioned a result of N. Narkevich, who reported 239% elongation in Fe-20Cr-20Mn-4.7V-1.14N (mass.%) steel tested at temperature 950 • C and strain-rate 4.6 × 10 −4 s −1 . Such relatively high elongation was obtained for the steel after a solid-solution treatment followed by 50% cold-rolling and age-hardening at 700 • C for 1 h. The microstructure of the steel during high-temperature tests, probably, was not strictly single-phase austenitic but also contained Cr-based and V-based nitrides. This result lied in line with those for single-phase austenitic stainless steels, in which the superplastic-assisted elongation does not exceed 280% [1,28]. Mineura [29] reported much higher elongation (527%) for Fe-20Cr-10Ni-0.7N (mass.%) steel at temperature 800 • C and strain rate 8 × 10 −4 s −1 . They used two-step cold rolling with intermediate anneal at 1000 • C for obtaining fine-grained austenitic structure stabilized by fine chromium nitrides. Vanadium-alloying promotes a homogeneous (continuous) reaction of precipitate hardening in austenitic CrMn steels [24], and this fact could provide higher stability of the fine-grained structure during high-temperature tests as compared to chromium nitrides. Therefore, there is a potential for improvement of the values for the superplastic elongation obtained by Mineura [29].This paper aimed to find out the superplastic characteristics in high-nitrogen V-alloyed austenitic steel Fe-19Cr-22Mn-1.5V-0.3C-0.6N (mass.%).

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Section: Resultsmentioning

confidence: 99%

On the Superplastic Deformation in Vanadium-Alloyed High-Nitrogen Steel

Астафурова¹,

Moskvina²,

Panchenko³

et al. 2019

Metals

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“…Prior to necking, the specimen is in a uniaxial stress state, whereas after necking, it is in a tri‐axial stress state. Since the flow stress associated with a tri‐axial stress state is larger than that associated with a uniaxial stress state, an appropriate correction is required .…”

Section: Mechanical Behavior Of Mppomentioning

confidence: 99%

Viscoplastic parameter identification of temperature‐dependent mechanical behavior of modified polyphenylene oxide polymers

Doh

Hur

Lee

2018

Polymer Engineering & Sci

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Modified polyphenylene oxide (MPPO) is a widely known thermoplastic polymer and is extensively utilized for weight reduction of automobiles since it possesses outstanding mechanical properties, such as resistance and toughness. In this study, the viscoplastic behaviors of MPPO with respect to changes in temperature were identified through an approximate optimization method. For this work, parameter studies were conducted with a tensile simulation of the MPPO polymer, in accordance with the modified two‐layer viscoplastic material parameters and the suggested shift parameter. The sensitivity tendency of the force‐displacement curves was captured in accordance with the material parameters. Computational experiments for obtaining calibration error data were performed using the material parameters based on interior central composite design. Surrogate models of root mean square error relative to force and displacement were generated using the response surface method. The accuracy of the surrogate models was evaluated with R‐square. Optimization for obtaining the material parameters was performed using the non‐dominant sorting genetic algorithm‐II. The results showed that the calibration error from the finite element analysis was minimized and agreed with experimental data. POLYM. ENG. SCI., 59:E200–E211, 2019. © 2018 Society of Plastics Engineers

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“…Y 11 ). Anisotropy ratios and coefficients for zircaloy-4 and zirlo were previously determined from tensile tests ( Table 2) [20]. Chemical composition of zircaloy-4, which the paper is mainly concerned with and for which combined hardening coefficients are obtained eventually, is in accordance with ASTM: B350/B350M-11; main alloying elements are Sn (1.30 wt.%), Fe (0.22 wt.%), Cr (0.12 wt.%) and O (0.12 wt.%).…”

Section: Finite Element Model For Simple Shear Test and Materials Propmentioning

confidence: 99%

“…Anisotropy ratios and coefficients for Hill 48 yield criterion for zircaloy-4 and zirlo from tensile tests, as in[20].Fig. 4.…”

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Evaluation of combined hardening coefficients of zircaloy-4 sheets by simple shear test

Rickhey

Kim

Lee

et al. 2015

Materials & Design (1980-2015)

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On acquiring true stress–strain curves for sheet specimens using tensile test and FE analysis based on a local necking criterion

Cited by 25 publications

References 20 publications

On the Superplastic Deformation in Vanadium-Alloyed High-Nitrogen Steel

On the Superplastic Deformation in Vanadium-Alloyed High-Nitrogen Steel

Viscoplastic parameter identification of temperature‐dependent mechanical behavior of modified polyphenylene oxide polymers

Evaluation of combined hardening coefficients of zircaloy-4 sheets by simple shear test

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