Computation of crack tip elastic stress intensity factor in mode I by in–plane electronic speckle pattern interferometry

J. Parra–Michel, A. Martínez, and J.A. Rayas

Centro de Investigaciones en Óptica A.C., Lomas del Bosque 115, Col Lomas del Campestre León Guanajuato, México, email: jrpmichel@cio.mx

Recibido el 15 de abril de 2010 ]]> Aceptado el 9 de octubre de 2010

Abstract

In this work, a dual illumination beam system is used to obtain the stress intensity factor in modes one (mode I) to mechanical elements during tension testing. The displacement field is obtained by means of electronic speckle pattern interferometry and phase stepping technique. Deformations are calculated by the Stokes differentiation method. Results are compared with a numerical simulation using a finite element analysis technique.

Keywords: Stress intensity factor; ESPI; Stokes method; phase stepping.

Resumen

En este trabajo un sistema de iluminación dual es utilizado para la obtención del factor de concentración de esfuerzos en el primer modo (modo I) en un elemento mecánico durante la prueba de tensión, los campos de desplazamiento son obtenidos por Interferometría Electrónica del Moteado y la técnica de corrimiento de fase. Las deformaciones son calculadas mediante el método de diferenciación de Stokes. Los resultados obtenidos son comparados mediante una simulación usando el análisis de elemento finito.

Descriptores: Factor de intensidad de esfuerzo; interferometría electrónica de patrón de moteado; método de Stokes; corrimiento de fase.

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Acknowledgements

Authors wish to thank economical support from Consejo Nacional de Ciencia y Tecnología (CONACYT).

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