17 February 1987 A New Optical Method For Determining The Stress Intensity Factor
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Abstract
This paper provides an optical method for determining the stress intensity factor. The optical properties of grating and wedge are used to form two images of a specime which stagger a small distance. The distance can be regulated stepless. Information of the partial derivative of the sum of principal stress around the crack tip is directly obtained by the shearing interference of two images and then the stress intensity factor is evaluated. This method is suited to both transparent and opaque material. Its sensitivity can be increased by multiplying technique.
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Cao Hong, Jia Youquan, Wang Yinyan, "A New Optical Method For Determining The Stress Intensity Factor", Proc. SPIE 0814, Photomechanics and Speckle Metrology, (17 February 1987); doi: 10.1117/12.941703; https://doi.org/10.1117/12.941703
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