Experimental Investigation of GTN model parameters of 6061 Al alloy

Yildiz, Rasid Ahmed; Yılmaz, Şafak

doi:10.1016/j.euromechsol.2020.104040

Cited by 50 publications

(25 citation statements)

References 52 publications

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“…Wcislik 27 and Kossakowshi 28 evaluated f F through a measurement of the void volume fraction from the tensile fracture surface using scanning electron microscope (SEM). This method was used by Yildiz et al 29 to investigate the void nucleation of aluminum alloy 6061. The SEM observations provide an experimental methodology for parameter determination, but the judgment, for example, the grayscale threshold, which was used to determine whether a region is a void or matrix, remains largely subjective.…”

Section: Previous Parameter Determination Methodsmentioning

confidence: 99%

A novel method to uniquely determine the parameters in Gurson–Tvergaard–Needleman model

Zhang

Lü

Mano

et al. 2021

Fatigue Fract Eng Mat Struct

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Section: Previous Parameter Determination Methodsmentioning

confidence: 99%

A novel method to uniquely determine the parameters in Gurson–Tvergaard–Needleman model

Zhang

Lü

Mano

et al. 2021

Fatigue Fract Eng Mat Struct

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“…Another framework to deal with the problem of impact fracture could be a damage approach such as that developed by Gurson–Tvergaard 48,49 for ductile materials. Such approach allows computing the local mechanical quantities more accurately and thus better controlling the fracture process under impact.…”

Section: Discussionmentioning

confidence: 99%

Impact test behavior of aluminum alloys welded joints: Experimental and numerical analysis

Martínez

Ambriz

Naït-Abdelaziz

et al. 2021

Fatigue Fract Eng Mat Struct

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The Charpy impact test behavior of base metal, weld metal, and heat‐affected zone for 6061‐T6 and 7075‐T651 aluminum alloy welds was analyzed. Force versus time curves of welded joints were obtained by means of an instrumented Charpy pendulum. An explicit finite element model was implemented to evaluate the performance of the Cowper–Symonds constitutive model. Parameters were obtained through a strain‐rate‐sensitivity analysis of base metals at high strain rates. Experimental results were compared with those computed by finite element method (FEM) by assuming the same physical and geometrical conditions of the dynamic‐experimental tests. ANSYS‐LS DYNA was used to achieve the FEM simulations. The comparison between experimental and FEM results in terms of force versus time data was evaluated. Higher accuracies were observed in Al 7075‐T651 alloy (roughly 98%). The 6061‐T6 alloy has shown an approximation of about 90%. Discrepancies are explained in terms of the effective plastic strain at fracture.

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“…41 This work results in the SC11-TN extended damage model, where the total porosity ratio D is considered to be the result of growth, nucleation and coalescence of voids. The mathematical formulation for modeling the nucleation of voids is given in equation ( 6), following a macroscopic statistical approach acknowledging a normal distribution in the onset of voids, 4 where F N , S N and N are the material parameters.…”

Section: Formulation Of Sc11-tn Damage Lawmentioning

confidence: 99%

“…41 Hence resulting in the SC11-TN extended damage model, where the total porosity ratio D is considered to be the result of growth, nucleation and coalescence of voids. The mathematical formulation for modeling the nucleation of voids is given in Equation 6, following a macroscopic statistical approach acknowledging a normal distribution in the onset of voids, 4 where FN, SN and ϵN are the material parameters. The coalescence of cavities is modeled as an increment in the slope of the porosity ratio curve ruled by Equation 7, where fU is the ultimate porosity ratio, fF is the fracture porosity ratio and fcr is the critical porosity ratio defining the threshold to start coalescence.…”

Section: Formulation Of Sc11-tn Damage Lawmentioning

confidence: 99%

“…Ductile fracture is known to be the result of the growth, nucleation and ultimate coalescence of microcavities driven by plastic deformation. [1][2][3][4] Furthermore, the continuous increment of damage along large and near-fracture deformation states affects the overall mechanical response of the material, causing a reduction of the supported load in comparison with a non-porous material. The consideration of damage during certain metal forming processes, such as bending, single point incremental forming (SPIF) or deep drawing, [5][6][7][8][9] is essential for correctly predicting the mechanical behavior and failure of the material.…”

Section: Introductionmentioning

confidence: 99%

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Identification and validation of an extended Stewart-Cazacu micromechanics damage model applied to Ti–6Al–4V specimens exhibiting positive stress triaxialities

Rojas-Ulloa

Valenzuela

Tuninetti

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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In this research, the Stewart-Cazacu micromechanics coupled damage model is extended and validated adding nucleation and coalescence models as new damage mechanisms. The Ti–6Al–4V titanium alloy is chosen as a suitable hcp ductile material to be modeled using this extended damage law. The characterization of the damage evolution in this alloy is addressed throughout a quasi-static experimental campaign. Damage characterization relies on in situ X-ray tomography data and scanning electron microscopy imaging technique. The validation procedure consists in the implementation into the finite element research software Lagamine of ULiège and in the comparison of numerical predictions and experimental results. Load–displacement curves and damage-related state variables at fracture configuration from smooth and notched bar specimens submitted to tensile tests are analyzed. The nucleation and coalescence model extensions as well as an accurate elastoplastic and damage material parameter identification for Ti–6Al–4V samples are essential features to reach a validated model. The prediction capabilities exhibited for large strains are in good agreement with experimental results, while the near-fracture strains can still be improved.

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Experimental Investigation of GTN model parameters of 6061 Al alloy

Cited by 50 publications

References 52 publications

A novel method to uniquely determine the parameters in Gurson–Tvergaard–Needleman model

A novel method to uniquely determine the parameters in Gurson–Tvergaard–Needleman model

Impact test behavior of aluminum alloys welded joints: Experimental and numerical analysis

Identification and validation of an extended Stewart-Cazacu micromechanics damage model applied to Ti–6Al–4V specimens exhibiting positive stress triaxialities

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