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Numerical Methods for the Photoelastic Technique using Phase Shifting

Published online by Cambridge University Press:  11 August 2015

C. A. Magalhaes ,
P. S. Neto ,
P. A. A. Magalhaes Jr.  and
C. S. de Barcellos
C. A. Magalhaes
Affiliation:
Coordenacoes das Engenharias, Centro Universitario Newton Paiva, Belo Horizonte, Brazil Departamento de Engenharia Mecanica, Pontifícia Universidade Católica de Minas Gerais, Belo Horizonte, Brazil
P. S. Neto
Affiliation:
Departamento de Engenharia Mecanica, Pontifícia Universidade Católica de Minas Gerais, Belo Horizonte, Brazil
P. A. A. Magalhaes Jr.*
Affiliation:
Departamento de Engenharia Mecanica, Pontifícia Universidade Católica de Minas Gerais, Belo Horizonte, Brazil
C. S. de Barcellos
Affiliation:
Departamento de Engenharia Mecanica, Univesidade Federal de Santa Catarina, Florianópolis, Brazil
*
* Corresponding author ([email protected])
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Abstract

The objective of this research is to find new equations for a novelphase-shifting method in digital photoelasticity. Some innovations are proposed.In terms of phase-shifting, only the analyzer is rotated, and the otherequations are deduced by applying a new numerical technique instead of the usualalgebraic techniques. This approach can be used to calculate a larger sequenceof images. Each image represents a pattern and a measurement of the stressespresent in the object. A reduction in the difference between the theoretical andexperimental values of stresses was obtained by increasing the number of imagesin the equations for calculating phase. Every photographic image has errors andrandom noise, but the uncertainties due to these effects can be reduced with alarger number of observations.

Keywords

PhotoelasticityPhase shiftingNumerical methodsStress measurement
Type
Research Article
Information
Journal of Mechanics , Volume 31 , Issue 4 , August 2015 , pp. 355 - 367
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2015 

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