Experimental evaluation of Bauschinger effects during tension-compression in-plane deformation of sheet materials

18th Chemnitz Seminar on Materials Engineering – 18. Werkstofftechnisches Kolloquium

Härtel, M.^1 ; Illgen, C.^1 ; Wagner, M.F.-X.^1

Department of Materials Science, Institute of Materials Science and Engineering, Technische Universität Chemnitz, Chemnitz

09125, Germany^1

关键词: Bauschinger effects;    D. digital image correlation (DIC);    Experimental analysis;    Experimental evaluation;    In-plane deformation;    Mechanical testing machines;    Monotonic tensile tests;    Tensioncompressions;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/118/1/012018/pdf
DOI  :  10.1088/1757-899X/118/1/012018

来源: IOP

【 摘 要 】

An experimental analysis of the effect of in-plane strain path changes and Bauschinger effects during mechanical loading that involves compression is quite challenging for sheet materials because they are prone to buckling. In this paper, we present a newly developed method that allows to deform sheet metals in tension and in compression. Our experimental setup primarily consists of an anti-buckling clamping device that can be used in a universal mechanical testing machine. Surface strains are measured with a digital image correlation (DIC) system. To demonstrate the viability of our method, first tests are conducted on thin sheet specimens (1 mm thickness) of a DC06 steel. Several approaches to reduce friction between the clamping system and the specimen are investigated. The validity of the test results is established in monotonic tensile tests. Measurements with different amounts of maximum tensile strain and reversed strain values are also discussed, showing that the material exhibits a Bauschinger effect, which is further quantified using different Bauschinger parameters.