The Effect of Temperature on Anisotropy Properties of an Aluminium Alloy

Coër, J.; Bernard, Cédric; Laurent, Hervé; Andrade‐Campos, A.; Thuillier, Sandrine

doi:10.1007/s11340-010-9415-6

Cited by 39 publications

(29 citation statements)

References 30 publications

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“…In another study [39], we have shown that a weak temperature dependence of the plastic anisotropy coefficients has been observed from room temperature up to 200…”

Section: Tensile Testsmentioning

confidence: 85%

Mechanical Behaviour and Springback Study of an Aluminium Alloy in Warm Forming Conditions

Laurent

Coër

Grèze

et al. 2011

ISRN Mechanical Engineering

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This study deals with the mechanical behaviour and material modelling of an AA5754-O alloy at elevated temperature. Experimental shear tests were performed from room temperature up to 200• C, and the material behaviour has been identified with both shear and tensile tests, as a function of temperature. To analyse the influence of temperature during forming over springback, a split-ring test is used. Experimental results are obtained and compared to numerical simulations performed with the finite element in-house code DD3IMP. The numerical process of ring splitting is performed with the in-house code DD3TRIM. The main observed data are force-displacement curves of the punch during forming, cup thickness at the end of forming, and ring gap after splitting. It is shown that all these parameters are strongly dependent on the forming temperature. A correlation is obtained between experimental data and numerical simulation for the evolution of punch force and opening after springback as a function of temperature. The distribution of the tangential stress in the cup wall is the main factor influencing the springback mechanism in warm forming condition.

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“…In another study [39], we have shown that a weak temperature dependence of the plastic anisotropy coefficients has been observed from room temperature up to 200…”

Section: Tensile Testsmentioning

confidence: 85%

Mechanical Behaviour and Springback Study of an Aluminium Alloy in Warm Forming Conditions

Laurent

Coër

Grèze

et al. 2011

ISRN Mechanical Engineering

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“…The core part of the novel biaxial testing system is the biaxial mechanism, which was designed to be used on a Gleeble 3800 [45]. The test apparatus was used to convert an input uniaxial force from a Gleeble into an output biaxial force of different loading ratios by coupling two rotatable plates to a central drive shaft, so that different strain paths were realised.…”

Section: Design Of a Biaxial Testing Apparatusmentioning

confidence: 99%

Formability evaluation for sheet metals under hot stamping conditions by a novel biaxial testing system and a new materials model

Shao

Lin

et al. 2017

International Journal of Mechanical Sciences

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Published: Z. Shao, N. Li, J. Lin, T. Dean, 2017, Formability evaluation for sheet metals under hot stamping conditions by a novel biaxial testing system and a new materials model, Int. J. Mech. Sci., 120, pp149-158. AbstractHot stamping and cold die quenching has been developed in forming complex shaped structural components of metals. The aim of this study is the first attempt to develop unified viscoplastic damage constitutive equations to describe the thermo-mechanical response of the metal and to predict the formability of the metal for hot stamping applications. Effects of parameters in the damage evolution equation on the predicted forming limit curves were investigated. Test facilities and methods need to be established to obtain experimental formability data of metals in order to determine and verify constitutive equations. However, conventional experimental approaches used to determine forming limit diagrams (FLDs) of sheet metals under different linear strain paths are not applicable to hot stamping conditions due to the requirements of rapid heating and cooling processes prior to forming. A novel planar biaxial testing system was proposed before and was improved and used in this work for formability tests of aluminium alloy 6082 at various temperatures, strain rates and strain paths after heating, soaking and rapid cooling processes. The key dimensions and features of cruciform specimens adopted for the determination of forming limit under various strain paths were developed, optimised and verified based on the previous designs and the determined heating and cooling method [1]. The digital image correlation (DIC) system was adopted to record strain fields of a specimen throughout the deformation history. Material constants in constitutive equations were determined from the formability test results of AA6082 for the prediction of forming limit of alloys under hot stamping conditions. This research, for the first time, enabled forming limit data of an alloy to be generated at various temperatures, strain rates and strain paths and forming limits to be predicted under hot stamping conditions.

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“…Cooling rate is a critical condition for hot stamping process and air jet cooling was connected to the quench system to control the cooling rate. Since only uniaxial tension/ compression can be obtained on a standard Gleeble [33], an ad-hoc test apparatus was used to transform uniaxial tension to biaxial tension under different loading ratios, so that different strain paths were realised. A high speed camera with the DIC system was used to capture the speckle pattern pre-painted on the surface of the concerned central area of the specimen and the stochastic pattern does not degrade at temperatures below 1093°C.…”

Section: The Principles Of the Experimental Designmentioning

confidence: 99%

Development of a New Biaxial Testing System for Generating Forming Limit Diagrams for Sheet Metals Under Hot Stamping Conditions

Shao

Lin

et al. 2016

Exp Mech

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Conventional experimental approaches used to generate forming limit diagrams (FLDs) for sheet metals at different linear strain paths are not applicable to hot stamping and cold die quenching processes because cooling occurs prior to deformation and consistent values of heating rate, cooling rate, deformation temperature and strain rate are not easy to obtain. A novel biaxial testing system for use in a Gleeble testing machine has been adopted to generate forming limits of sheet metals, including aluminium alloys, magnesium alloys and boron steel, under practical hot stamping conditions in which heating and cooling occur. For example, the soaking temperature is about 900°C and the deformation temperature range is 550-850°C for boron steel [1] and the soaking temperature is about 535°C and the deformation temperature range is 370-510°C for AA6082 [2]. Resistance heating and air cooling were introduced in this pioneering system and the thermal analysis of different heating and cooling strategies was investigated based on a type of cruciform specimen. FE models with a UAMP subroutine were used to predict temperature fields on a specimen in ABAQUS 6.12. Digital image correlation (DIC) system was used to record strain fields of a specimen by capturing images throughout the deformation history and its postprocessing software ARAMIS was used to determine forming limits according to ISO standards embedded in the software. Heating and cooling strategies were determined after the analysis. Preliminary results of forming limit curves at the designated temperatures are presented in order to verify the feasibility of this new method.

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The Effect of Temperature on Anisotropy Properties of an Aluminium Alloy

Cited by 39 publications

References 30 publications

Mechanical Behaviour and Springback Study of an Aluminium Alloy in Warm Forming Conditions

Mechanical Behaviour and Springback Study of an Aluminium Alloy in Warm Forming Conditions

Formability evaluation for sheet metals under hot stamping conditions by a novel biaxial testing system and a new materials model

Development of a New Biaxial Testing System for Generating Forming Limit Diagrams for Sheet Metals Under Hot Stamping Conditions

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