Full field automated photoelasticity using two-load-step method

Tong Liu; Anand Krishna Asundi; Chai Gin Boay

doi:10.1117/1.1386372

1 August 2001 Full field automated photoelasticity using two-load-step method

Tong Liu, Anand Krishna Asundi, Chai Gin Boay

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Optical Engineering, Vol. 40, Issue 8, (August 2001). https://doi.org/10.1117/1.1386372

A new two-load-step approach to the phase-shifting method is presented for the full field determination of both isoclinic and isochromatic parameters in photoelasticity. The ambiguity that exists in the phase-shifting photoelasticity is overcome by investigating the relationships between the phase retardation introduced by two different load steps. The isoclinic angle is automatically determined in the correct range [-?/2, ?/2] and the isochromatic parameter is therefore obtained unambiguously. The results obtained from a bending test and an irregular specimen subjected to multiple forces demonstrate the effectiveness of this method. Compared with the load-stepped method (Ekman and Nurse, 1998) or the three-load method (Asundi et al., 2000), this new algorithm is a simpler approach and is easier to execute.

©(2001) Society of Photo-Optical Instrumentation Engineers (SPIE)

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Tong Liu, Anand Krishna Asundi, and Chai Gin Boay "Full field automated photoelasticity using two-load-step method," Optical Engineering 40(8), (1 August 2001). https://doi.org/10.1117/1.1386372

Published: 1 August 2001

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