| 摘 要： | A photoelastic method for the measurement of the difference between principal stresses is extendedto the measurement of a two dimensional ultrasonic stress.The stress of an ultrasonic plane pro-gressive wave or cylindrical progressive wave at any point in a transparent solid can be determined. The method of the measurement and its principle is presented,including the derivation of therelation between the principal stresses difference and the principal stresses for plane or cvlindricalprogressive wave.A practical example of measurement is described,its results being compared withthose of an electrical method.
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