Journal of Materials and Engineering Structures
Volume 6, Numéro 2, Pages 233-247
2019-06-30
Experimental And Numerical Analysis Of The Fields Of The Frozen Stresses In An Epoxy Sphere Using The Stress-freezing Method And Mechanical Slicing
Authors : Touahir Kamel . Bilek Ali . Bocher Philippe . Beldi Mustapha .
Abstract
The stresses induced by a mechanical contact imposed on a birefringent sphere have been studied experimentally and numerically. The birefringent sphere is machined from a birefringent parallelepiped on a high speed numerically controlled machine. The residual stresses developed in the birefringent sphere have been eliminated by a heat treatment relaxation. The technique of freezing and mechanical cutting in thin slices was used. In the case of 3D photoelasticity, the frozen stress techniques, which are very much used, may introduce residual stresses in the cut up slices. Although the means to avoid the introduction of these residual stresses are well established, these techniques remain time consuming. Slices are analyzed on a polariscope using plane polarized light and circular polarized light. The photoelastic fringes are used to determine the principal directions of the stresses as well as the values of the stresses. A numerical simulation using the finite elements made it possible to make a comparison with the experimental results. The analysis shows a good correlation between experimental measurements and numerical simulation.
Keywords
Contact; Isoclinic; Isochromatic; Photoelasticity
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