Elasto-Plasticity Behavior of High Strength Steel Sheet in Biaxial Stress Path Change

Uemori, Takeshi; Kuramitsu, Tohru; Mito, Yuji; Hino, Ryutaro; Naka, Tetsuo; Yoshida, Fusahito

doi:10.2320/matertrans.p-m2010817

Cited by 4 publications

(4 citation statements)

References 12 publications

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“…It is found the experimental data of cross effect show very complicated stress–strain responses . While the stress–strain responses in both 45° and 90° direction with 5% plastic pre‐strain do not show the yield plateau after re‐yielding, the stress–strain responses in the two directions with 10% plastic pre‐strain shows the yield plateau after stress‐reversal.…”

Section: Resultsmentioning

confidence: 93%

Modeling of Bauschinger Effect During Stress Reversal

Uemori

Sumikawa

Yoshida

2013

steel research int.

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It is widely known that the constitutive model of Bauschinger effect is one of key points to conduct the accurate sheet metal stamping. In the present research, the elasto‐plasticity behaviors of thin sheet metals were investigated by conducting in‐plane cyclic tension–compression tests in the different angle from the pre‐strained direction. In order to evaluate the accuracy of constitutive models for describing the above mentioned elasto‐plasticity behaviors, including the Bauschinger effect, some numerical experiments were conducted for the corresponding stress paths calculations by using three kinds of constitutive models: the isotropic hardening model (hereafter IH model), Yoshida–Uemori model (hereafter Y–U model), and the modified Yoshida–Uemori kinematic hardening model (hereafter modified Y–U model). From the comparisons, it is found that the author's present constitutive model shows a good agreement with the experimental stress–strain responses.

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Section: Resultsmentioning

confidence: 93%

Modeling of Bauschinger Effect During Stress Reversal

Uemori

Sumikawa

Yoshida

2013

steel research int.

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“…Yield Loci. Generally yield locus (equi-plastic work surface) of sheet metal is determined by performing biaxial tension test using a cruciform specimen [5]. However, biaxial tension test of perforated sheet is not easy because of non-uniform stress/strain distribution in a gauge section.…”

Section: Plastic Deformation In Uniaxial/biaxial Tensionmentioning

confidence: 99%

Deformation Behavior and Formability of Sheet Metal Laminate Consisting of Perforated Core Sheet and Thin Skin Sheets

Hino

Nakamura

Ishida

et al. 2013

KEM

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This study presents a new type of sheet metal laminate for lightweight products, and investigates its plastic behavior and formability. The sheet metal laminate consists of three layers, i.e. two thin skin sheets and a perforated core sheet with round holes, which are bonded together by diffusion bonding. Pure copper sheets are used for both of the core and the skins. Plastic deformations of the laminate and its component layers under uniaxial and biaxial tension are examined experimentally and analytically. Results of uniaxial stress-strain responses and yield loci (contours of plastic work) show that the perforated core sheet exhibits anisotropic behavior induced by the hole array but the laminated sheet becomes rather isotropic. Forming limit diagrams of the laminate and its component layers are also obtained by performing stretch forming test. Forming limit of the perforated core sheet is markedly lower than that of the monolithic sheet, and that of the thin skin is in between. It is found that forming limit of the laminate is comparable to that of the thin skin.

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“…An appropriate choice of the combination of constitutive model is of vital important for an accurate sheet-metal stamping simulation [1][2][3] For that purpose, "Yoshida-Uemori model" has been proposed and its high capability in simulating cyclic behavior. The model has been already verified by comparing the numerical simulations with several evidences [4][5][6][7]. However, it was found that the verification of this model, especially the details of the non-proportional deformation behaviors, is not guaranteed for low yield point materials.…”

Section: Introductionmentioning

confidence: 99%

Springback of Aluminum Alloy Sheet Metal and its Modeling

Uemori

Sumikawa²,

Tamura³

et al. 2014

AMR

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Aluminum alloy sheet metals have been widely utilized for a light weight construction of automobile. However, Aluminum sheet metals still remain one of the difficult materials to predict the accurate final shapes after press forming processes, because of several mechanical weak features such as lower Youngs modulus, strong plastic anisotropy of yield stress, Lankford values, and so on. In order to solve the problems, the present author has developed a new constitutive model called Modified Yoshida-Uemori model. The present model can describe accurate non-proportional hardening behaviors of Aluminum alloy sheet metals. In the present research, several experimental procedures were carried out to reveal the mechanical properties of Aluminum alloy sheet metals. From the comparison between experimental data and the corresponding calculated results by our constitutive model, the performance of our model was evaluated. In addition to the above mentioned research, the evaluation of some springback analyses were also carried out. The calculated results show good agreements with the corresponding experimental data.

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Elasto-Plasticity Behavior of High Strength Steel Sheet in Biaxial Stress Path Change

Cited by 4 publications

References 12 publications

Modeling of Bauschinger Effect During Stress Reversal

Modeling of Bauschinger Effect During Stress Reversal

Deformation Behavior and Formability of Sheet Metal Laminate Consisting of Perforated Core Sheet and Thin Skin Sheets

Springback of Aluminum Alloy Sheet Metal and its Modeling

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