A solution to the problem of principal stress distribution on the boundary of a circular hole and on a section of the model in semi-infinite plate during passage of the stress wave is presented. The solution was obtained experimentally by using a polyester material model, utilizing a double-pulsed Ruby Laser with energy/pulse of 0.25 joule. The stress pulse was applied by loading with reproducible falling weight of the pendulum. Utilizing an external event to initiate the firing order of Ruby Laser and using a different time delay, we have recorded, respectively, the isochromatic and isopachic fringes at one model using a Faraday Rotator.

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