Application of the Multiple-Spark-Gap Camera to Dynamic Photoelasticity

Dally, J. W.; Brillhart, L. V.

doi:10.5594/j05852

Cited by 4 publications

(2 citation statements)

References 6 publications

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“…Dynamic photoelasticity was utilised as the experimental method for obtaining whole field data which shows in a visual format the entire interaction process. The photoelastic experiments were conducted with a t w o dimensional model of the half plane which was fabricated from a large sheet of dimensions 6 x 96 x 144 mm of Homalite 100." A cavity 2 5 m m in diameter was machined tangent to the boundary of the sheet as indicated in Fig.…”

Section: Methodsmentioning

confidence: 99%

Rayleigh wave interaction with inhomogeneities—Part 1: Near surface cavity and inclusion

Roßmanith¹,

Dally

1983

Strain

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The interaction of a Rayleigh pulse with a circular cavity and circular inclusion has been examined employing dynamic photoelasticity. The explosively generated R-pulse travels along the free boundary and is trapped in the ligament between the cavity and the free boundary with little energy propagating around the cavity. For cavities and inclusions at shallow depth below the free surface failure of the ligament occurs and most of the energy associated with the incident R-wave is converted b y diffraction into body and surface waves. The existence of a shadow zone on the downstream side of the circular cavity provides a means of identifying the location of the cavity which is nearly tangent to the surface b y e.g. ultrasonic inspection.

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Section: Methodsmentioning

confidence: 99%

Rayleigh wave interaction with inhomogeneities—Part 1: Near surface cavity and inclusion

Roßmanith¹,

Dally

1983

Strain

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“…A Fourier transform analysis of the pulse indicates that the predominate wavelengths are in the range of 2.5 to 25 cm, with most of the energy of the pulse associated with wavelengths between 2.5 and 12.7 cm. Dynamic photoelastic data in the form of light-field isochromatic fringe patterns were recorded with a Cranz-Schardin multiple spark camera, which has recently been described by Dally and Brillhart [1968]. This camera records sixteen frames at rates that range from 30,000 to 800,000 frames tensile stress in the Rayleigh pulse has decreased to 138 kg/cm'.…”

Section: Experimental Pbocedurementioning

confidence: 99%

Photoelastic analysis of Rayleigh wave propagation in wedges

Lewis¹,

Dally²

1970

J. Geophys. Res.

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Dynamic photoelastic measurements of Rayleigh wave propagation in a series of seventeen seismic models of wedges have been described. Transmission and reflection coefficients based on both stress and displacement were established for wedges with included angles ranging from 40° to 180°. The results indicate that the transmission and reflection coefficients are rapidly changing functions of the wedge angle. The experimental results for the transmission and reflection coefficients agree remarkably well with previous experimental work using crystal transducers. Comparisons of the experimental results with theoretical predictions of A. K. Mal and L. Knopoff (1966) in most cases showed reasonable agreement.

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