Aplikace metody ESPI pro experimentální analýzu rámu vozidla na bázi kompozit-kov

Abstract

The thesis deals with the verification of the ESPI method for experimental determination of deformation and stress, determination of stiffness of additively manufactured specimens in mechanical testing using optical methods, design of FEM calculation methodology in accordance with performed experiments and application of gained experience in component design, purposefully manufactured additively from composite and attached to the vehicle frame.

The verification of the ESPI method is performed by measuring the values of tensile and shear strain of a metal sample loaded by tension and torsion using an extensometer on a biaxial loading machine. Furthermore, the ESPI method was applied to the weld to verify the suitability of the Q-100 method and equipment for more complex geometries. The obtained results are compared with the actual position of the crack on the loaded parts. The experience is used in the application of the ESPI method on a restored brake pedal of a motorcycle made of 3D printing from metal powder. The results from the ESPI method are compared with the results from the numerical simulation of FEM.

Furthermore, the work verifies the methodology the FEM model of printed composites using link/beam elements. A qualitative comparison of individual results of numerical FEM simulations and measurements by ESPI/DIC methods was performed. The stiffness results for the tests of each load mode - tension, shear and combinations of tension and shear - were compared. Finally, the work focuses on the application of gained experience to a car part attached to the vehicle frame.