19 July 1996 Hybrid techniques in experimental strain/stress analysis by optical methods
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Abstract
The modern achievements in optical measurement techniques applied in experimental mechanics, the increasing resolving power of data recording systems, combined with digital image processing techniques yield more and better informations on the mechanical reactions of structures and structural elements than at any time before, together with an ever increasing amount of data, provided for further evaluation. No matter which optical method will be used generally the observed and recorded optical phenomena are not identical with the finally wanted informations, mainly informations on the stress-state. Hence it is necessary to calculate the final results, introducing the measured and digital data, obtained from image processing, as input data into proper and advanced mathematical procedures. According to the discrete nature of these data the mathematical algorithms are transformed into discrete numerical procedures, like finite element method and boundary element method. Such a combination of experimental and numerical analysis, named hybrid method, warrants a higher reliability and accuracy of results, which are closer to reality also because experiments represent the reality more easily than theory only. The application of hybrid methods presuppose the availability of complex measuring-, on-line-processing--and sufficient computer capacity. The principle of hybrid methods will be explained and demonstrated by some examples of application.
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Karl-Hans Laermann, "Hybrid techniques in experimental strain/stress analysis by optical methods", Proc. SPIE 2861, Laser Interferometry VIII: Applications, (19 July 1996); doi: 10.1117/12.245152; https://doi.org/10.1117/12.245152
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