Numerical investigation of evolution of earing, anisotropic yield and plastic potentials in cold rolled FCC aluminium alloy based on the crystallographic texture measurements

Liu, Wencheng; Chen, Bernard; Pang, Yong

doi:10.1016/j.euromechsol.2018.12.005

Cited by 28 publications

(6 citation statements)

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“…Also, the average value of the normalized uniaxial flow stress values as well as the r-values were used to assess the anisotropy parameters of Yld2004-18p. The assess method can be referred to Liu's work 24 and the 18 anisotropy coefficients of Yld2004-18p are presented in Table 3.…”

Section: Constitutive Equationmentioning

confidence: 99%

Springback prediction and compensation method for anisotropy sheet in multi-point forming

Liu

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Multi-point forming (MPF) is widely used for three-dimensional (3D) curved surfaces, and the multi-point die (MPD) is reconstructed with the desired curvature and the compensated curvature which is caused by springback. Springback is affected by mechanical anisotropy of material in MPF. To predict the springback of anisotropy sheet in MPF process, the finite element models were established based on the three different yield criteria namely; von Mises, Hill's 48 and Yld2004-18p. To compensate the springback of anisotropy sheet, an algorithm with consideration of anisotropy for doubly curved sheet was proposed based on the results of the finite element simulation and the elastic perfect plastic biaxial bending model. The direct curvature adjustment (DCA) method and the Non-Uniform Rational B-Splines (NURBS) method are used to generate the die surface after springback compensation. The final shape of the workpiece is obtained by the execution of iterative compensation. The forming experiments were carried out and the results show that the anisotropic model is closer to the experiment than the isotropic model. Finally, the influences of blank thickness, part shape and forming radius on compensation accuracy were discussed to verify the applicability of the algorithm.

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Section: Constitutive Equationmentioning

confidence: 99%

Springback prediction and compensation method for anisotropy sheet in multi-point forming

Liu

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…EBSD provided granular insights, but its representativeness could vary. The Voronoi tessellation algorithm addressed this, creating EBSD-based grainscale models revealing grain dimensions and texture effects [33][34][35][36]. However, for LPBFed Ti6Al4V alloys, where mechanical traits involve granular components, columnar crystals, and lamellar structures, existing grain-scale RVEs have limited coverage.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Crystal Plasticity Finite Element Investigations of Plastic Anisotropy in Additively Manufactured Ti6Al4V Alloy

Wang,

Xu,

Liu

et al. 2024

Metals

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Additive manufacturing, particularly the laser powder bed fusion (LPBF) technique, has ushered in a new era of intricate metallic component fabrication, leveraging the exceptional performance of the Ti6Al4V alloy. However, the intricate mechanical behavior of additively manufactured Ti6Al4V, particularly its anisotropic attributes stemming from non-equilibrium microstructures, presents a formidable challenge. In this study, we embark on a comprehensive exploration of the anisotropic mechanical properties exhibited by LPBFed Ti6Al4V alloy. The interplay between microstructure and tensile response is unraveled by integrating experimental investigations with crystal plasticity finite element (CPFE) simulations. The acquired empirical data with CPFE model predictions are harmonized through systematic tensile tests along distinct processing orientations. The results unveil the genesis of plastic anisotropy within the LPBFed Ti6Al4V alloy, ascribed to the emergence of columnar grains meticulously aligned along the building direction, despite the intricate material microstructure inherent to additive manufacturing. These findings collectively furnish a holistic comprehension of the intricate nexus between material attributes and the mechanical manifestations intrinsic to metal components realized through additive manufacturing modalities.

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“…21,23,24 Since the full-field CPFEM showed a good capability in the description of micromechanics of polycrystal under external loads, this advanced method can successfully reproduce the crystallographic texture induced mechanical anisotropy of as-rolled sheet metal observed by experimental uniaxial tensile tests in various material directions. 7,8,[25][26][27][28][29] Furthermore, CPFEM can be used to predict the out-of-plane anisotropy due to no constraint on deformation mode. This property was difficult to be obtained by physical tests due to the thin wall structure of sheet metal.…”

Section: Introductionmentioning

confidence: 99%

Multi-level deep drawing simulations of AA3104 aluminium alloy using crystal plasticity finite element modelling and phenomenological yield function

Sun

Liu

2021

Advances in Mechanical Engineering

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This paper proposed a hierarchical multi-level model to study the crystallographic texture induced mechanical anisotropy of AA3104-H19 aluminium sheet from mesoscale to continuum scale. In the mesoscale, full-field crystal plasticity finite element method (CPFEM) was used to provide both in-plane and out-of-plane yield stresses and plastic potential points in various deformation modes. In the continuum scale, these materials sampling points were used to determine the parameters of two phenomenological yield functions (Yld2000-2d in plane stress space and Yld2004-18p in 3D stress space) using associated flow rule (AFR) and non-associated flow rule (non-AFR). The results indicate that higher accuracy obtained by Yld2000-2d and Yld2004-18p yield functions associated with non-AFR in comparison with AFR. These phenomenological models were successfully implemented into finite element (FE) code using an explicit integration scheme to simulate sheet metal forming. It is found that the 3D Yld2004-18p model involved with both in-plane and out-of-plane anisotropies is superior to 2D Yld2000-2d model which only accounts for in-plane anisotropy.

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Numerical investigation of evolution of earing, anisotropic yield and plastic potentials in cold rolled FCC aluminium alloy based on the crystallographic texture measurements

Cited by 28 publications

References 50 publications

Springback prediction and compensation method for anisotropy sheet in multi-point forming

Springback prediction and compensation method for anisotropy sheet in multi-point forming

Experimental and Crystal Plasticity Finite Element Investigations of Plastic Anisotropy in Additively Manufactured Ti6Al4V Alloy

Multi-level deep drawing simulations of AA3104 aluminium alloy using crystal plasticity finite element modelling and phenomenological yield function

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