Showing papers by "Sandro Barone published in 2000"

Automated Photoelasticity Applied With Thermoelasticity to Real Components

Abstract: A complete definition of stresses requires an evaluation of the magnitude and directions of the components of stress related to a co-ordinate system. The combination of thermoelasticity and photoelasticity offers the potential to achieve this objective since photoelasticity provides the direction of principal stresses and difference in magnitude, whilst thermoelasticity yields the sum of the magnitude. Recent experiments have shown that simultaneous measurements can be made. The demands of simultaneous measurement for a full-field of view imply that all the photoelastic information must be captured quickly. A hybrid technique based on spectral contents analysis and phase stepping has been developed. The methodology and instrumentation for combining the automated photoelasticity with thermoelasticity has been developed In conclusion, it is shown that the complete state of stress over an area of the surface of the component can be evaluated without any prior knowledge of the stress state.

The Development of a Hybrid Technique Employing the Boundary Element Method for Thermoelastic Stress Separation

Abstract: This paper presents a development of a hybrid technique employing a boundary element method for determining individual stress components in two-dimensional arbitrarily shaped domains from experimental isopachics only. The procedure consists of a numerical solution of two Poisson equations representing equilibrium for two-dimensional plane-stressed solids with zero body forces. An existing technique is employed for smoothing interior thermoelastic data and enhancing boundary information. The algorithm of stress separation has been implemented with the help of commercial codes. The whole procedure has been tested through a complete post-processing example of thermoelastic stress analysis data.