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

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:66

Article

Zillmann, Benjamin¹  Wagner, Martin F. -X.¹  Schmaltz, Stefan²  Schmidl, Eric¹  Lampke, Thomas¹  Willner, Kai²  Halle, Thorsten³ 

[1] Tech Univ Chemnitz, Inst Mat Sci & Engn, D-09125 Chemnitz, Germany

[2] Univ Erlangen Nurnberg, Appl Mech, D-91058 Erlangen, Germany

[3] Univ Magdeburg, Inst Mat Engn & Joining Technol, D-39104 Magdeburg, Germany

关键词: Mechanical testing;    Biaxial compression;    Sheet metals;    Temper rolling;   

DOI  :  10.1016/j.ijsolstr.2015.03.031

来源: Elsevier

【 摘 要 】

Detailed 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 tensiletests 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. (C) 2015 Elsevier Ltd. All rights reserved.

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