Anisotropic mechanical behavior and formability criterion for zinc sheets

Milesi, Marc; Logé, Roland E.; Jansen, Yann

doi:10.1016/j.jmatprotec.2014.06.023

Cited by 19 publications

(13 citation statements)

References 31 publications

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“…Este perfil inusual en el rango biaxial es el resultado de las influencias combinadas de la fuerte anisotropía de la aleación de zinc y de la direccionalidad introducida por la fase intermetálica TiZn 16 la cual muestra un fibrado en la dirección de laminado. Resultados similares fueron encontrados por MILESI et al [13] para una chapa de una aleación semejante con un espesor de 1 mm.…”

Section: Resultados Y Discusiónunclassified

Efecto del cambio en el camino de deformación en la formabilidad de chapas de acero DP-780 y zinc Zn20

2018

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RESUMEN Los Diagramas Límite de Conformado (DLC), frecuentemente utilizados para caracterizar la formabilidad de chapas metálicas, se determinan asumiendo trayectorias de carga proporcionales hasta la ocurrencia de la inestabilidad plástica. Sin embargo, las deformaciones límite son afectadas significativamente por los cambios en los caminos de deformación, práctica muy usual en procesos reales de conformado de metales. El objetivo de este trabajo es analizar el efecto de la trayectoria de carga sobre el DLC de chapas de acero DP-780 de 0,9 mm de espesor y zinc Zn20 de 0,65 mm de espesor utilizando ensayos en dos etapas. Se estudiaron las deformaciones límite bajo tracción uniaxial para los materiales pre-deformados bajo carga equibiaxial. El DLC de referencia se obtuvo a través de ensayos de acopado hidráulico y de tracción uniaxial en probetas con diferentes geometrías de entalla. Las deformaciones límite obtenidas en la chapa DP-780 pre-deformada se encuentran por encima del diagrama de referencia, evidenciando una no despreciable dependencia de la formabilidad del material con la historia de carga. Por otro lado, las diferencias entre los DLCs de la chapa Zn20 son significativas. Esto se atribuye no sólo a efectos de trayectoria sino también a la recristalización dinámica continua que experimenta el material a temperatura ambiente.

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Section: Resultados Y Discusiónunclassified

Efecto del cambio en el camino de deformación en la formabilidad de chapas de acero DP-780 y zinc Zn20

2018

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“…As already mentioned, previous studies on zinc alloy formability carried out material characterization by means of the Hill-48 yield function and the Hollomon or Swift hardening laws, separately fitted for each sample direction [1,5,7,14,15,16]. Although the Hill-48 criterion is a simple anisotropic plastic model that requires a low number of material parameters, using independent models for the different loading directions drastically increases the number of material parameters.…”

Section: Discussionmentioning

confidence: 99%

“…Moreover, the hardening behavior is described by means of the Hollomon power law written for RD as:Y(ε¯p)=Kfalse(ε¯0+ε¯pfalse)n where K is the strength coefficient, n is the hardening exponent (note that in this context, unlike other approaches [1,7,14,16,17], these two coefficients are only defined for RD), and with ε¯0=(σypRDK)1n, σypRD being the yield strength for RD (see Table 1). In addition, the rate of the equivalent plastic strain is ε¯p˙=σm:bold-italicε˙pσ¯, such that εp is the plastic strain tensor whose rate obeys the classical (objective, i.e., frame-indifferent) associated flow rule bold-italicε˙p=trueλ˙∂trueσ¯…”

Section: Methodsmentioning

confidence: 99%

“…This material complexity leads to a high variability of the strain and stress responses even on different samples over the same direction as shown in [5,6]. For HCP metals, the rolling process produces an alignment of the c -axis normal to the rolling plane with a deviation of approximately 25°, inducing a high anisotropy in the sheet [7]. Specifically for the Zn-Cu-Ti alloy, the relation between the texture from the rolling process and the bendability at different temperatures is discussed in [8].…”

Section: Introductionmentioning

confidence: 99%

“…To accurately describe the material behavior under general forming conditions, diverse anisotropic yield functions, thoroughly described in [13], have been developed in recent decades. Until now, the formability of zinc sheets has been driven by the use of constitutive models based mainly on the Hill-48 yield criterion combined with the Hollomon or Swift hardening laws, where both the yield function and hardening law are loading angle dependent [1,5,7,14,15,16]. The works cited made use of a “Fiber Vector”, defined according to the direction of the major strain [17].…”

Section: Introductionmentioning

confidence: 99%

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Characterization of the Elastoplastic Response of Low Zn-Cu-Ti Alloy Sheets Using the CPB-06 Criterion

et al. 2019

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Unlike other HCP metals such as titanium and magnesium, the behavior of zinc alloys has only been modeled in the literature. For the low Zn-Cu-Ti alloy sheet studied in this work, the anisotropy is clearly seen on the stress-strain curves and Lankford coefficients. These features impose a rigorous characterization and an adequate selection of the constitutive model to obtain an accurate representation of the material behavior in metal forming simulations. To describe the elastoplastic behavior of the alloy, this paper focuses on the material characterization through the application of the advanced Cazacu-Plunket-Barlat 2006 (CPB-06 for short) yield function combined with the well-known Hollomon hardening law. To this end, a two-stage methodology is proposed. Firstly, the material characterization is performed via tensile test measurements on sheet samples cut along the rolling, diagonal and transverse directions in order to fit the parameters involved in the associate CPB-06/Hollomon constitutive model. Secondly, these material parameters are assessed and validated in the simulation of the bulge test using different dies. The results obtained with the CPB-06/Hollomon model show a good agreement with the experimental data reported in the literature. Therefore, it is concluded that this model represents a consistent approach to estimate the behavior of Zn-Cu-Ti sheets under different forming conditions.

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Elastoplastic Characterization of Zn-Cu-Ti Alloy Sheets: Experiments, Modeling, and Simulation

Alister

Celentano

Nicoletti

et al. 2021

J. of Materi Eng and Perform

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Anisotropic mechanical behavior and formability criterion for zinc sheets

Cited by 19 publications

References 31 publications

Efecto del cambio en el camino de deformación en la formabilidad de chapas de acero DP-780 y zinc Zn20

Efecto del cambio en el camino de deformación en la formabilidad de chapas de acero DP-780 y zinc Zn20

Characterization of the Elastoplastic Response of Low Zn-Cu-Ti Alloy Sheets Using the CPB-06 Criterion

Elastoplastic Characterization of Zn-Cu-Ti Alloy Sheets: Experiments, Modeling, and Simulation

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