DUMSTSSA · Matlab scientific toolbox for strain- stress analysis

Final Activity Report Summary - DUMSTSSA (Matlab Scientific Toolbox for Strain- Stress Analysis)

Optical methods of engineering analysis are today widely used to determine the state of deformations in machine parts. In comparison with traditional techniques for strain calculation such as strain gauge techniques the optical methods enjoys the advantages of being full-field, it is well suited to capture strain peek in a high strain gradient areas. In most cases, to carry out the component design, a subsequent data processing is necessary to get strain or stress distribution. This project has developed using Matlab - software for technical computing - a scientific toolbox for the strain-stress analysis having as input data the full-field deformations of the specimen surface obtained by experimental optical methods. Has been defined calculations algorithms to fulfil selection and read of the experimental data (full-field deformations) corresponding to different measuring systems and different file formats, computation of full-field strains and stresses according to different theoretical algorithms (plane strain, plane stress, plates theory), computation of principal strains, stresses and their directions, interactive and intuitive visualisation of the results 2D and 3D graphical plots and other data processing (filtering, visualisation, storage, export, printing etc.). The scientific toolbox has been provided with a friendly and logical Graphical user interface (GUI) containing all necessary information to perform a complete data analysis and interconnected with the existing software which control the measuring systems based on Moiré fringes technique and Electronic speckle pattern interferometry (ESPI). The implemented algorithms were validated using analytical classical examples and synthetic (generated) input displacements. These kinds of data have the important advantage to be noise free. The compared results revealed a very good convergence that proved the reliability of the scientific toolbox to accurate process experimental data. The Matlab developed applications were accompanied by experimental measurements (including achievement of the measuring setups) to determine strain values in a specimen subjected to tension using ESPI and determination of shear stresses in bars subjected to torsion using membrane analogy and shadow Moiré by phase shifting method. The most important scientific achievements were published in journals or presented at national and international conferences.

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