An experimental and numerical investigation of different shear test configurations for sheet metal characterization

Yin, Qing; Zillmann, B.; Suttner, Sebastian; Gerstein, Gregory; Biasutti, M.; Tekkaya, A. Erman; Wagner, Martin F.‐X.; Merklein, Marion; Schaper, Mirko; Halle, Thorsten; Brosius, Alexander

doi:10.1016/j.ijsolstr.2013.12.006

Cited by 100 publications

(37 citation statements)

References 19 publications

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“…Such shear localizations may also induce material damage at the surface of the specimen, which supports the conclusion that the gradation process is finalized just after the first cavity and no additional forming elements are needed. This finding also supports the need for careful characterization of the material's shear behavior [38] from both experimental and theoretical points of view to minimize the risk of shear-induced cracking in SPD processes. Figure 6f corresponds to Point 5 and represents the point after the final reduction of the specimen with an effective strain of approximately 4.3.…”

Section: Resultssupporting

confidence: 75%

Microstructural Evolution during Severe Plastic Deformation by Gradation Extrusion

Frint

Härtel

Selbmann

et al. 2018

Metals

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Abstract:In this contribution, we study the microstructural evolution of an age-hardenable AA6082 aluminum alloy during severe plastic deformation by gradation extrusion. A novel die design allowing an interruption of processing and nondestructive billet removal was developed. A systematic study on the microstructure gradient at different points of a single billet could be performed with the help of this die. Distinct gradients were investigated using microhardness measurements and electron microscopy. Our results highlight that gradation extrusion is a powerful method to produce graded materials with partially ultrafine-grained microstructures. From the point of view of obtaining an ultrafine-grained surface layer with maximum hardness, only a small number of forming elements is needed. It was also found that large incremental deformation by too many forming elements may result in locally heterogeneous microstructures and failure near the billet surface caused by localization of deformation. Furthermore, considering economical aspects of processing, fewer forming elements are preferred since several processing parameter-related cost factors are then significantly lower.

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Section: Resultssupporting

confidence: 75%

Microstructural Evolution during Severe Plastic Deformation by Gradation Extrusion

Frint

Härtel

Selbmann

et al. 2018

Metals

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“…Isotropic elasto-plastic material behavior with a yield condition according to von Mises was applied. The flow curve used for the input was taken from a uniaxial tensile test in RD of a low carbon interstitial free steel, which was also used in Yin et al (2014) to analyze strain fields in special shear specimens. To extrapolate to larger plastic strains, the Swift hardening law was used.…”

Section: Finite Element Analysis Of Virtual Experimentsmentioning

confidence: 99%

“…To complete the yield surface for the DX56 materials in all four quadrants, simple shear tests were performed. The modified Miyauchi specimen, presented in Yin et al (2014), was used. To calculate the shear stress vs. strain curve the proposed evaluation method in Yin et al (2014) was applied.…”

Section: Comparison Of Yield Stresses In Compression and Tensionmentioning

confidence: 99%

In-plane biaxial compression and tension testing of thin sheet materials

Zillmann

Wagner

Schmaltz

et al. 2015

International Journal of Solids and Structures

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a b s t r a c tDetailed experimental data on the behavior of textured sheet metals under compressive loading is important to describe their tension-compression asymmetry. This is particularly needed for materials that exhibit a strength-differential effect, or in cases where the Bauschinger effect occurs. So far, there is no systematic work describing the third quadrant in the 2D stress space under biaxial compressive loading. This paper presents a new device for biaxial, compressive in-plane testing of thin sheets. Biaxial and uniaxial compression experiments are carried out in the strain controlled device, analyzing the behavior of deep drawing steel sheets with and without skin-pass treatment. Moreover, in order to allow for the experimental description of the yield surfaces, biaxial tensile tests are performed. Detailed numerical validations and experimental strain analysis both for the new specimen for biaxial compressive testing and for the cruciform specimen for biaxial tensile testing show that reasonably homogeneous strain distributions can be achieved. The combined experimental and numerical method presented here allows to evaluate the tension-compression asymmetry of thin sheet materials. The results for the skin-passed condition clearly exhibit a tension-compression asymmetry, which highlights the necessity of biaxial compression tests already in the as-received material condition. The biaxial compression test opens a pathway to a more detailed analysis of the flow behavior of thin sheets under biaxial compression loading.

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“…For this reason, some experiments are specifically designed to improve the results. In shear test configurations [8], the geometric dimension of specimen is adapted, so that rotational effects are reduced and the quasi-homogenous centre of the shear zone is enlarged. Within these tests, the shear stress is often approximated analytically by using the testing force and assuming the stress distribution to be uniform over the shear zone.…”

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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An experimental and numerical investigation of different shear test configurations for sheet metal characterization

Cited by 100 publications

References 19 publications

Microstructural Evolution during Severe Plastic Deformation by Gradation Extrusion

Microstructural Evolution during Severe Plastic Deformation by Gradation Extrusion

In-plane biaxial compression and tension testing of thin sheet materials

Semi-analytic parameter identification for complex yield functions

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