光弾性瞬間撮影について

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タイトル別名
  • The Fundamentals of an Instantaneous Photography Applied to Photoelasticity
  • ヒカリダンセイ シュンカン サツエイ ニ ツイテ

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The object of the present paper is to report the fundamentals of an instantaneous photography that an electric spark in a high voltage is used as a light source of photoelastic stress patterns. The electric spark circuit with a subsidiary spark-gap is used in this experiment and the time of exposure of this circuit is set at about 2×1O-6 sec. The best conditions of the exposure and contrast for the Fuji X-ray film are as follows : Deep red filter×2, F=2.8 ; main spark-gap vol. 46-49 K.V.P.P. Deep red filter×1, F=4.0 ; main spark-gap vol. 44-47 K.V.P.P. The main gap distance is set at 22 mm (64.2 K.V.-gap) and a starting voltage of 3 K.V.D.C. is taken in this case. As the examples photographed by this method, stress patterns of the impact of beams and the noched bers are shown. And then the behaviours of plastics under the dynamic stress state are discuseed by the use of Voigt and Maxwell models.

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