Pedagogical Applications of Photoelastodynamics for Solid Mechanics and Dynamics of Structures
by
Yves Gourinat
Ecole Nationale Superieure d'Ingenieurs de Constructions Aeronautiques 1, Place Émile Blouin 31056 TOULOUSE cedex05 FRANCE
Coauthors: Agus Sigit Pramono

This paper presents developments realized on photoelastodynamic bench of ENSICA's Department of Mechanical Engineering. In a first step, classical wave, vibrating, shock and rotating parts theories, including several analytical results, were compared with color pictures of isochromic lines obtained with rapid camera and urethane resin specimens. For non-linear shock and large deflection, explicit code LS-DYNA has been used. Then, the facility has been used to analyse dynamic work of gears for power transmission, in comparison with numerical computations performed at ENSICA. In addition, this photostress research development has lead to a demonstration which is now included in engineering first year general courseware, about stress analysis. It is now planned to visualize vibrating eigenwaves in isotropic and orthotropic membrane. Orthotropy will be obtained by inclusion of plasic fibers in resin, and will also provide dynamic information about reinforcement/resin interfaces.

Date received: January 22, 1999