Determination of stress concentration coefficients upon cyclic loading by photometric analysis of structure images

7th International Conference Radiation-thermal Effects and Processes in Inorganic Materials

材料科学;物理学

Minina, N.A.^1 ; Emishkin, V.A.^1 ; Ovchinnikov, I.N.^2

Federal State Institution of Science, Baykov Institute of Metallurgy and Materials, Russian Academy of Sciences, Moscow, Russia^1

Bauman Moscow State Technical University Moscow, Russia^2

关键词: Concentration coefficients;    Constant intervals;    Electrical discharges;    Experimental methods;    Photometric images;    Stress concentrators;    Structure image;    Surface reflectivity;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/168/1/012049/pdf
DOI  :  10.1088/1757-899X/168/1/012049

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The development of an experimental method for the determination of stress concentration coefficient by the photometric analysis of surface reflectivity of material near stress concentrator and at a distance from it is considered in the paper. The experiments were performed with the AD-19 aluminum alloy samples under fatigue test conditions realized at a vibrating table with cantilevered sample. Notches 5 mm long and 0.4 mm wide spaced at constant intervals were applied by electrical discharge along one edge of the samples. The reflections of light from the fragments in the vicinity of the stress concentrator and from the opposite edge of the sample were compared with the help of photometric image analyzer. It is shown that such analysis can be used to determine the stress concentration coefficients.