Forming Limit Prediction in Bore Expansion by Combination of Finite Element Simulation and Ductile Fracture Criterion

Takuda, Hirohiko; Ozawa, Katsuya; Hama, Takayuki; Yoshida, Tohru; Nitta, Jun

doi:10.2320/matertrans.p-m2009817

Cited by 13 publications

(6 citation statements)

References 5 publications

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“…The material model used in the simulation is assumed to obey the J 2 flow theory, and its hardening law is defined as σ = 410ε 0.24 MPa. The material constants are assumed to be a = −0.043 and b = 0.22 from the research work of Takuda et al [9]. Blank thickness is defined as 0.25 mm.…”

Section: Evaluation Methods For the Effect On Drawabilitymentioning

confidence: 99%

Effect of alternating blank holder motion of drawing and wrinkle elimination on deep-drawability

Yagami

Manabe

Yamauchi

2007

Journal of Materials Processing Technology

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Section: Evaluation Methods For the Effect On Drawabilitymentioning

confidence: 99%

Effect of alternating blank holder motion of drawing and wrinkle elimination on deep-drawability

Yagami

Manabe

Yamauchi

2007

Journal of Materials Processing Technology

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“…Therefore, in order to accurately predict the timing and location of an occurrence of stretch-flanging fracture in finite element simulations, it is essential to use an anisotropic yield function that is capable of reproducing the plastic deformation behavior of the given material. There have been many studies on of stretch-flanging [3]- [6]. However, no experimental validation of the material model used in the numerical analyses was reported in these studies.…”

Section: Introductionmentioning

confidence: 91%

Hole expansion simulation of high strength steel sheet

et al. 2010

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The deformation behavior of high-strength steel sheet during hole expansion is investigated both experimentally and analytically to clarify the effects of the material model (anisotropic yield function) on the finite element simulation of a hole expansion. The test material used in the hole expansion test is a dual-phase steel alloy with a tensile strength of 780 MPa. The elastic-plastic deformation behavior of the test material is precisely measured using biaxial tensile tests with cruciform specimens to determine the appropriate anisotropic yield function for the test material. Moreover, forming simulations of the hole expansion using selected yield functions are carried out. The Yld2000-2d function [.] with an exponent of 4 has given the closest agreement with the experimentally measured contours of plastic work and the directions of the plastic strain rates. It was also found that the Yld2000-2d function with an exponent of 4 has given the closest agreement with the observed thickness distribution along the expanded hole edge. Consequently, anisotropic yield functions significantly affect the predictive accuracy of the deformation behavior of a sheet during a hole expansion

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“…45,46 The apparent major and minor strains (equation (7)) at fracture are plotted for different perforation patterns in Figure 15.…”

Section: Appendixmentioning

confidence: 99%

“…The constants were determined to be a = 0.35 and b = 0.50 from the fracture strains in uniaxial and plane-strain tensile tests of imperforate AA5052 sheets annealed at 300°C for 1 h (for the detailed procedure, see Takuda et al 45 ). Using the analytical models shown in Figure 2, s m , s, and d e are obtained in a finite-element simulation, and the following integral I is calculated for each element and each deformation step…”

Section: Appendixmentioning

confidence: 99%

Forming-limit prediction of perforated aluminium sheets with square holes

Chiba

Takeuchi

Nakamura

2015

The Journal of Strain Analysis for Engineering Design

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The forming-limit strains of perforated aluminium alloy (AA5052-O) sheets with square holes were theoretically and experimentally estimated for two types of hole arrangements: square and triangular patterns. The theoretical forminglimit curves were obtained by finite-element analyses on a unit module of the perforated sheets using two different approaches: the phenomenological theory and crystal plasticity theory. Hill's quadratic anisotropic and von Mises yield functions were used for the phenomenological analysis, and the one-element-per-grain model was adopted for the crystal plasticity analysis. To determine the forming limits, two different types of plastic instability criteria were applied. The experimental forming-limit strains were also obtained through a Nakazima stretching test. The theoretical predictability of the forming-limit curves was assessed by comparing the theoretical and experimental results. The comparison demonstrated that (1) the plastic instability criterion based on the external force power predicted qualitatively the same forming-limit curves as the criterion based on the equivalent plastic strain of the ligament for both hole arrangement patterns and (2) although the shapes of the predicted forming-limit curves were in reasonable agreement with the experimental results, the level of the predicted limit strains was considerably higher than that of the experimental limit strains. Thus, it was found that neither of the plastic instability criteria previously proposed for perforated sheets is appropriate to characterise the formability of perforated aluminium sheets with square holes.

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Forming Limit Prediction in Bore Expansion by Combination of Finite Element Simulation and Ductile Fracture Criterion

Cited by 13 publications

References 5 publications

Effect of alternating blank holder motion of drawing and wrinkle elimination on deep-drawability

Effect of alternating blank holder motion of drawing and wrinkle elimination on deep-drawability

Hole expansion simulation of high strength steel sheet

Forming-limit prediction of perforated aluminium sheets with square holes

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