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National Repository of Grey Literature 4 records found  Search took 0.01 seconds. 
Identification of material parameters of an orthotropic metal sheet
 Vavřík, Daniel ; Fiala, Zdeněk ; Grediac, M. ; Jandejsek, Ivan ; Micka, Michal ; Minster, Jiří ; Pierron, F.
Identification of constitutive equation parameters of orthotropic specimens is a highly demanding task requiring a full field measurement of the strain fields. This measurement is done using a Digital Image Correlation technique. The material parameters are identified by employing the Finite Element Method Updating and the Virtual Field Method alternatively.
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Optimization and Calibration of Digital Image Correlation Method
 Jandejsek, Ivan ; Valach, Jaroslav ; Vavřík, Daniel
An example of instrumentation and optimization of Digital Image Correlation measurement system for given class of experiments is described in this paper.
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Nondestructive methods for detection of hidden fatigue crack in the steel bridge element
 Valach, Jaroslav ; Frýba, Ladislav ; Jandejsek, Ivan ; Lesák, Jaroslav ; Vála, Ondřej ; Urushadze, Shota
In this paper we discuss applicability and usability of three non-destructive methods for investigation of fatigue crack propagation in railway bridge structural elements subjected to the repetitive loading. These methods are: an optical method based on the digital image correlation, the active thermography method and the classical x-ray radiographic method.
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Contactless Operational Identification of Turbine Blade Stress and Vibration
 Procházka, Pavel ; Vaněk, František
The study deals with the contactless vibrodiagnostic system used for identification of steam turbine blade stress and vibration. The tip-timing method based on the evaluation of time differences of blade passages in different rotor revolutions is described and the results of the development of a new contactless magnetoresistive sensor are presented. A new approach to the identification of blade stress and vibration based on the analysis of the amplitude differences of impulse blade signals is applied.
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