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13 June 2005 Experimental studies of mechanical joints by automated grating (moire) interferometry
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Current design, analysis and control engineering applications require effective experimental methodologies and tools for determination of displacement and strain fields as well as material characterization. One of the most important problem in engineering objects is proper design and quality of joints between elements in the form of welds, glued and riveted joints and many others. Specificly the fatigue and fracture mechanics problems in joints are difficult to analyze numerically, therefore they need experimental support. In the paper we present the results of static, dynamic and fatigue experiments performed by grating (moire) interferometry systems. These full-field optical extensometers provide information about in-plane displacement field (u,v) and strain fields (εx, εy, γxy) in the region of a joint subjected to various modes of loads. It is shown that proper design of full-field extensometer (insensitivity to vibration, good quality of interferogram, automatic analysis of long series of interferograms) allows to use it efficiently directly at conventional loading machine in workshop environment and for long term fatigue tests. In the paper we present results of studies of: conventional laser welds (static, fatigue tests), friction stir weld (static tests), riveted joint (static, fatigue tests). The methodology of determination of local material constants in different zones of a joint (inc. Poisson ratio, Young’s modulus) is given. The future trends in hybrid experimental-numerical analysis of joints in conventional and novel material are discussed.
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G. Dymny, M. Kujawinska, L. Salbut, and D. Boronski "Experimental studies of mechanical joints by automated grating (moire) interferometry", Proc. SPIE 5856, Optical Measurement Systems for Industrial Inspection IV, (13 June 2005);

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