Prediction of spring-back in anisotropic sheet metals

Nguyen, Vu; Chen, Zhiping; Thomson, Peter Frederic

doi:10.1243/095440604774202295

Cited by 6 publications

(8 citation statements)

References 19 publications

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“…Nguyen et al. 1,25,26 reported the results for specimens oriented in the rolling direction. It was found that the modified YLD96, when combined with the mixed hardening (MH) model using two nonlinear components and one linear component of back stress, i.e.…”

Section: Resultsmentioning

confidence: 99%

“…Details of the draw-bend test and simulation of these tests using the explicit finite element code DYNA3D have previously been described by Nguyen et al. 1,25,26…”

Section: Methodsmentioning

confidence: 99%

“…Material models or constitutive equations in numerical models can be formulated at the microscopic level (using internal state variables) or at the macroscopic level (using yield surface plasticity) to account for material characteristics. 1…”

Section: Introductionmentioning

confidence: 99%

“…The above constitutive equations when combined with the modified YLD96 are capable of accounting for IH and KH, simultaneously or separately, depending on the nature of the material properties. 1,25,26…”

Section: Introductionmentioning

confidence: 99%

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Prediction of springback in anisotropic sheet metals: The effect of orientation and friction

Nguyen

Thomson

Chen

2014

Proceedings of the Institution of Mechanical Engineers, Part L:

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In this paper, springback of anisotropic sheet based on the modified form of the asymmetric non-quadratic yield function (YLD96) for plane stress conditions due to Barlat et al. (Yield function development for aluminium alloy sheets. J Mech Phys Solids 1997; 45: 1727–1763), suitable for describing mixed (isotropic and kinematic) hardening in aluminium alloy sheets under the Bauschinger Effect was compared with the results of tests. Simulation of uniaxial tensile and cyclic tests including both nonlinear isotropic and nonlinear kinematic hardening showed the necessity of including the Bauschinger effect in the constitutive equations at both small and large strains. Following the application to prediction of springback in draw bending of these alloys oriented in the rolling direction, draw-bending tests on AA2024-O and AA7075-O alloy sheets are described. The springback parameters of specimens with axes oriented at 45° and 90° to the rolling direction were measured and compared with prediction based on the modified form of the YLD96, which captured the hardening response at small and large strains when combined with the mixed hardening model, predicting springback in very good agreement with experimental results. The number of components of back stress used in this model depends on the nature of the nonlinear behaviour of the material. For alloys AA2024-O and AA7075-O, excellent agreement with experiments required the use of up to three nonlinear components of back stress. Prediction suggested values of friction consistent with published values and showed that friction inversely affected the radius of sidewall curl, but was not sensitive to lower and upper opening angle. This was consistent with the findings of Carden et al. (Measurement of springback. Int J Mech Sci 2002; 44: 79–101), although those authors also reported that very low friction may increase springback in their proposed draw-bending test. The results confirmed the efficacy of the yield surface model based on YLD96, modified to include nonlinear isotropic and nonlinear kinematic hardening, for predicting deformation subject to the Bauschinger effect.

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Section: Resultsmentioning

confidence: 99%

“…Details of the draw-bend test and simulation of these tests using the explicit finite element code DYNA3D have previously been described by Nguyen et al. 1,25,26…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Prediction of springback in anisotropic sheet metals: The effect of orientation and friction

Nguyen

Thomson

Chen

2014

Proceedings of the Institution of Mechanical Engineers, Part L:

Self Cite

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show abstract

“…Some reports go further, with specific recommendations for small N IP : 7 IP for minimizing sensitivity (Yao et al, 2002), 9 IP for accuracy (Nguyen et al, 2004), and 7 IP for more accurate answers than 3, 5 or 11 (Xu et al, 2004). A default value for N IP of 5 appears in shell elements for some commercial software: Abaqus (Abaqus, 2005) and Pam-Stamp (Zhang, 2005), whereas N IP of 9 is recommended for accuracy with LS-Dyna (Nguyen et al, 2004). These references, taken together, imply that N IP is not a critical numerical parameter in springback simulation, at least for N IP greater than about 5.…”

Section: Introductionmentioning

confidence: 99%