Measeurement of intermal strain/shape fields by means of holografy
Tutor / director / evaluatorThevar, Thangavel
Document typeMaster thesis (pre-Bologna period)
Rights accessOpen Access
The goal of the project is the verification of the evaluation method published by Dändliker. This includes the implementation of his Finite Difference Method as a computer program as well as the measurement of the surface deformation of an object, and the determination of the internal stresses and strains. The results of this evaluation shall be compared with the analytically calculated stresses and strain of the chosen object. The steps in more details are: - Implementation of the Dändliker  algorithms on a computer. For the implementation standard software systems may be used, e.g. MatLab. - Measurement of the bending of a rectangular steel bar under a point load. The steel bar shall be fixed on one end in the longitudinal direction and the load shall be applied on the other end, fig. 1. Fig. 1: Sketch of the set-up The deformation of the surface shall be measured by Digital Holography in three dimensions in a sufficient number of surface points. - The internal stresses and strains shall be evaluated by the Finite Difference Method. The data must be presented in a form to be compared to an analytical solution. - The internal stresses and strains shall be evaluated by known analytical solutions. The two results – measured and computed - for the internal stresses and strains shall be compared. Differences have to be discussed.