Investigation of the Deformation and Fracture of Composites with the Help of Electronic Speckle Interferometry
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INVESTIGATION OF THE DEFORMATION AND FRACTURE OF COMPOSITES WITH THE HELP OF ELECTRONIC SPECKLE INTERFEROMETRY T. I. Voronyak,1, 2 Ya. L. Ivanyts’kyi,1 L. I. Muravs’kyi,1 and O. I. Semenets’3
UDC 669.017.539.6
We develop a procedure for the experimental investigations of the deformation and fracture of specimens of coal-plastic composites. A schematic diagram of the experimental installation is presented and the results of investigations are analyzed. We also show the efficiency of electronic speckle interferometry for the detection of defects in coal-plastic composites and estimation of their critical stress-strain state. Keywords: composite materials, electronic speckle interferometry, deformation of specimens.
Novel technologies used in the contemporary industrial production require the development of efficient experimental methods for the diagnostics and control of new structural materials. Among the modern and promising structural materials, an especially important role in machine-building and, especially, in the aircraft and automotive industry, is played by composite materials. As advantages of the structures made of composite materials, we can mention their low specific weight together with high strength and stiffness, low thermal conductivity, resistance to the influence of corrosive media, etc. The determination of the strength characteristics of these composite materials and, in particular, of layered composites is complicated by their significant anisotropy connected with the inhomogeneity of their structure. The contemporary technologies of manufacturing of the composites do not guarantee their homogeneity and the absence of defects. Hence, the problem of timely detection and analysis of defects aimed at the prevention of fracture of the analyzed structures or at the prediction of their residual service life by the methods of nondestructive testing is extremely important. The development of contemporary methods for the visualization of the strain and stress fields enables us to pose the problem of diagnostics of the materials and their joints on a qualitatively new level. Among new promising directions of technical diagnostics, we can especially mention the information technologies of speckle metrology among which the method of electronic speckle interferometry proves to be one of the most efficient [1–4]. Experimental Installation and the Procedure of Investigations To study the deformation and fracture of specimens of structural composite materials, we developed a special installation combining an electronic speckle interferometer and a loading machine. In manufacturing the speckle interferometer, we used the Twyman–Green scheme substantiated by the results of preliminary experimental investigations of the beam and sheet specimens of structural materials. 1
Karpenko Physicomechanical Institute, Ukrainian National Academy of Sciences, Lviv, Ukraine. Corresponding author; e-mail: [email protected]. 3 “ANTONOV” State Enterprise, Kyiv, Ukraine. 2
Translated from Fizyko-Khimichna Mekhanika Materiali
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