Yield locus evolution and constitutive parameter identification using plane strain tension and tensile tests

Aydin, Murat; Gerlach, Jörg C.; Keßler, L.; Tekkaya, A. Erman

doi:10.1016/j.jmatprotec.2011.06.018

Cited by 16 publications

(5 citation statements)

References 7 publications

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“…By means of finite element simulations, the behaviour of the material was adjusted following an experimentally known response. This approach has been successfully used for the determination of the tensile behaviour beyond the necking point [24] or the yield loci calibration [25].…”

Section: Procedures Based On the Inverse Modelling Methods Of The Com...mentioning

confidence: 99%

A New Approach for Obtaining the Compression Behavior of Anisotropic Sheet Metals Applicable to a Wide Range of Test Conditions

Ayllón

Miguel

Martínez

et al. 2020

Metals

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The consideration of anisotropic and asymmetric tension-compression behaviour in some materials has proved to be of great importance for the modelling of plastic behaviours that allow for accurate results in sheet metal forming analysis. However, obtaining this compression behaviour of a sheet metal in the principal plane directions is one of the most complex aspects from an experimental point of view. This complexity is notably increased when this behaviour needs to be analysed under high temperature conditions. This paper presents a compression test system with load application in the in-plane sheet directions which is characterised by a relative technical simplicity allowing its application under temperature conditions of up to 750 °C and different strain-rates. Due to the specific test conditions, namely the high temperature, it is not possible to use the common systems for measuring the strains involved and to obtain the stress-strain curve. Therefore, this paper proposes two methods for this purpose. The first is the performance of interrupted tests and measurement of the central cross sections. The second consists of inverse calibration using finite element simulations. The sensitivity of the proposed test methodology is validated through the characterisation, at room temperature, of the compression and tensile behaviour of six materials with different plastic deformation phenomena. In this way, the asymmetric tension-compression phenomena are accurately identified and high compression strains of around 0.3, higher than those existing in the literature, are investigated. A novel test methodology is thus established that is easily applicable for the mechanical characterisation of sheet metal at high temperature.

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Section: Procedures Based On the Inverse Modelling Methods Of The Com...mentioning

confidence: 99%

A New Approach for Obtaining the Compression Behavior of Anisotropic Sheet Metals Applicable to a Wide Range of Test Conditions

Ayllón

Miguel

Martínez

et al. 2020

Metals

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“…The most popular approach for parameter identification is finite element method updated (FEMU), using iterative finite element analysis within an inverse analysis [11][12][13][14][15]. The method uses the discrepancy between numerical results and experimentally determined loads and strain fields to define an objective function.…”

Section: State Of the Artmentioning

confidence: 99%

“…For instance, inverse analysis with iterative FEA was used by Güner et al [11] to identify the yield function parameters of Yld2000-2d [5] using the FE-code Abaqus-Explicit and the Levenberg-Marquardt Algorithm. In a subsequent study of Aydın et al [12], a parameter identification for the evolution of the yield surface Yld2000-2d [5] was performed using the optimisation tool Ls-Opt and the FE-code Ls-Dyna with experimental data of standard tensile tests and a plane strain tension test. Further studies calibrate the yield surface on experiments designed for the validation of specific forming conditions in order to get a processoriented material response.…”

Section: State Of the Artmentioning

confidence: 99%

Semi-analytic parameter identification for complex yield functions

Küsters¹,

Brosius²

2016

MATEC Web Conf.

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Abstract. This paper presents a new parameter identification scheme for complex yield criteria of sheet metals using experimentally determined load and strain distributions and combining analytical stress analysis on sectional strain data with common inverse analysis. The approach is suitable for specimen with a non-homogenous strain distribution in the specimen and reduces computing time compared to common methods like iteratively updated FEM considerably. It serves to identify a set of material parameters in a fast and precise manner, describing the material behaviour.

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“…However, for instance, to calibrate CB2001 yield criterion, in case of plane stress state, the necessary conventional input data includes 7 r-values and 7 uniaxial yield stresses [39]. Furthermore, for accurate identification procedure of advanced yield functions [34,40,41], the required set of experimental input data includes, besides the seven uniaxial yield stresses and r-values, the equibiaxial yield stress b  , equibiaxial strain ratio r b -value, and plane strain stresses [42,43], among others, such as biaxial stresses acquired from free expansion bulged tubes, which are needed for accurate calibration of constitutive models applied to simulate tube hydroforming process [44]. Nevertheless, the type of nonstandard experimental tests are usually not available in industrial or research laboratories, besides, it is uneconomical task to carry out a large number of costly mechanical tests.…”

Section: Artificial Data Generationmentioning

confidence: 99%

Mechanical characterization and constitutive parameter identification of anisotropic tubular materials for hydroforming applications

Khalfallah

Oliveira

Alves

et al. 2015

International Journal of Mechanical Sciences

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This paper aims to identify the constitutive parameters of anisotropic tubular materials and to verify the accuracy of models' prediction. The identification of the constitutive parameters is based on information obtained from tensile tests, performed on samples cut from the tubes, and from the free tubular bulge test, using a home-developed bulge forming machine. Two tubular materials exhibiting different anisotropic behaviour and work hardening characteristics are investigated: a mild steel S235 seamed tube and an aluminium alloy AA6063 extruded tube. It is shown that advanced phenomenological yield functions, including a large number of anisotropy parameters, can accurately describe the plastic flow of highly anisotropic tubular materials during the tube hydroforming process.However, parameter identification procedure of advanced yield criteria requires a high number of experimental tests. Thus, in order to enable the parameter identification of these yield criteria when using a reduced set of experimental results, the present study develops a method that combines tensile tests with: i) a free bulge test, which is used to characterize the biaxial stress state experienced by the tube during the bulge testing, and ii) some generated artificial input data. Finally, the proposed method shows an excellent agreement between numerical predictions and experimental results.

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Yield locus evolution and constitutive parameter identification using plane strain tension and tensile tests

Cited by 16 publications

References 7 publications

A New Approach for Obtaining the Compression Behavior of Anisotropic Sheet Metals Applicable to a Wide Range of Test Conditions

A New Approach for Obtaining the Compression Behavior of Anisotropic Sheet Metals Applicable to a Wide Range of Test Conditions

Semi-analytic parameter identification for complex yield functions

Mechanical characterization and constitutive parameter identification of anisotropic tubular materials for hydroforming applications

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