Photoelasticity stress analysis using carrier fringe and FFT techniques

Quan, Chenggen; Bryanston-Cross, Peter John; Judge, T.R.

doi:10.1016/0143-8166(93)90014-c

Cited by 55 publications

(17 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(1), but similar to that shown in Eqs. (4) or (19). Nevertheless it has to be noticed that a linear relationship between the retardation and the phase values obtained by applying the arctangent functions to the intensity levels of the R, G and B components can be obtained [16,18,70,72], depending on the spectral properties of the filters of the camera and of the light source.…”

Section: Calibration Of the Retardation Maps Obtained By The Psmmentioning

confidence: 99%

See 1 more Smart Citation

Review of RGB photoelasticity

Ajovalasit

Petrucci

Scafidi

2015

Optics and Lasers in Engineering

View full text Add to dashboard Cite

Section: Calibration Of the Retardation Maps Obtained By The Psmmentioning

confidence: 99%

“…The Fourier transform method is based on the acquisition of isochromatics using carrier fringes obtained, for example, by a specimen subjected to bending or by means of a quartz wedge [19]. The retardation is determined using a single image.…”

Section: Introductionmentioning

confidence: 99%

Review of RGB photoelasticity

Ajovalasit

Petrucci

Scafidi

2015

Optics and Lasers in Engineering

View full text Add to dashboard Cite

“…7,9 More recently, we have presented a technique known as load-stepping photoelasticity, 14 and Ngl5 has published work adopting a similar approach. In our new technique, the approach of Buckberry and Towers 12 has been extended to enable the isochromatic parameter to be determined unambiguously.…”

Section: Introductionmentioning

confidence: 97%

Absolute determination of the isochromatic parameter by load-stepping photoelasticity

Ekman

Nurse

1998

Experimental Mechanics

View full text Add to dashboard Cite

ABSTRACT--A new approach to full-field automated photoelasticity is presented in which a circular polariscope is used to enable the isochromatic phase value (c 0 to be determined unambiguously and without input of a known isochromatic value obtained using an auxiliary technique. Values of cosc~ are obtained from light-field and dark-field images for three loads of small incremental steps. Using a relatively straightforward procedure, ramped phase maps for c~ are produced which can be unwrapped using conventional techniques. The resulting distribution of cl is then found absolutely using information provided by which Oct is the incremental change in the isochromatic phase value between the load steps. The results obtained for disk-in,compression tests presented here in comparison with theoretical solutions demonstrate that the technique is both simple to use and very accurate. A similar approach may be adopted using three wavelengths instead of three load steps.

show abstract

“…The use of Fourier analysis [18,19], multiple wavelength photoelasticity [20] and halffringe photoelasticity [21] have been used successfully by other researchers. However, the limitations of these techniques in terms of the number of images required, and/or the limited information acquired lead the authors to focus on the use of phase stepping or phase shifting, which is capable of generating maps of continuous retardation and of isoclinic angle from a minimum of four images [22].…”

Section: Introductionmentioning

confidence: 98%

An Integrated Approach to the Separation of Principal Surface Stresses Using Combined Thermo-Photo-Elasticity

Greene

Patterson

2006

Exp Mech

View full text Add to dashboard Cite

A new instrument capable of the full-field separation of principal stresses on the surface of a component is presented. The instrument combines the techniques of thermoelastic stress analysis and reflection photoelasticity in a single optical head, permitting the simultaneous capture of both data from the same point of view. A single strain witness coating is employed for the acquisition of both the thermoelastic and photoelastic data, which is both birefringent under applied stress conditions and opaque at the infrared wavelengths to which the thermoelastic analysis system is sensitive. This enables the combined technique to be performed continuously from the same surface during loading. The performance of the new instrument is validated in the analysis of a classical laboratory specimen of known geometry. Separated stress data from the experiment is compared to simulated data, demonstrating that the accuracy of the stress separation technique is comparable to that of the individual thermoelastic and photoelastic techniques, and it is concluded that combined thermo-photo-elasticity is a powerful tool for the experimental separation of principal surface stresses.

show abstract

Photoelasticity stress analysis using carrier fringe and FFT techniques

Cited by 55 publications

References 14 publications

Review of RGB photoelasticity

Review of RGB photoelasticity

Absolute determination of the isochromatic parameter by load-stepping photoelasticity

An Integrated Approach to the Separation of Principal Surface Stresses Using Combined Thermo-Photo-Elasticity

Contact Info

Product

Resources

About