Strain controlled cyclic tests on miniaturized specimens

4th International Conference Recent Trends in Structural Materials

Procházka, R.^1,2 ; Dugan, J.^1

COMTES FHT A.s., Prmyslová 995, Dobany

334 41, Czech Republic^1

University of West Bohemia, Faculty of Mechanical Engineering, Department of Material Science and Technology, Univerzitní 8, Pilsen, Czech Republic^2

关键词: Cyclic behaviour;    Digital image correlation technique;    Experimental materials;    Fatigue parameter;    Lifetime assessment;    Service components;    Size miniaturization;    Strain-controlled;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/179/1/012060/pdf
DOI  :  10.1088/1757-899X/179/1/012060

来源: IOP

【 摘 要 】

The paper is dealing with strain controlled cyclic tests using a non-contact strain measurement based on digital image correlation techniques on proportional sizes of conventional specimens. The cyclic behaviour of 34CrNiMo6 high-strength steel was investigated on miniaturized round specimens with diameter of 2mm that were compared with specimens in accordance with ASTM E606 standards. The cycle asymmetry coefficient was R= -1. This application is intended to be used for life time assessment of in service components in future work which enables to carried out a group of mechanical tests from a limited amount of the experimental material. The attention was paid to confirm the suitability of the proposed size miniaturization geometry, testing set up and procedure. The test results obtained enabled to construct Manson-Coffin curves and assess fatigue parameters. The purpose of this study is to present differences between cyclic curves and cyclic parameters which have been evaluated based on conventional and miniaturized specimens.