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Measurement of strain distribution by the moiré fringe multiplication method at a tip of propagating fatigue crack

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Abstract

The moiré fringe multiplication method which used interference of the +1st and -1st order diffracted beams from a 1000 lines/mm phase-type grating on the specimen surface was applied to the measurement of strain distribution at the tip of a propagating fatigue crack in a steel plate having a central crack. The sensitivity of the measurement was equivalent to the sensitivity obtained from a 2000 lines/mm grating on the specimen when the conventional moiré fringe method is used. The gage length was of the order of 10μm. The result of the measurement of strain distribution was applied to the estimation of the fatigue crack propagation rate.

Résumé

La méthode de multiplication des franges de Moiré qui utilise les interférences d'ordre +1 et -1 de rayons lumineux diffractés par une grille de 1000 lignes/millimètre, du type “à phase” sur la surface de l'éprouvette, a été appliqué à la mesure de la distribution des déformations à l'extrémité d'une fissure de fatigue en cours de propagation dans une tôle d'acier présentant une fissure centrale.

La sensibilité de la mesure était équivalente à la sensibilité obtenue par une grille de 2000 lignes/millimètre appliquée sur l'éprouvette et utilisant la méthode de franges de Moiré conventionnelle. La longueur de référence était de l'ordre de 10 microns. Le résultat des mesures de distribution de déformation a été appliqué à l'estimation de la vitesse de propagation d'une fissure de fatigue.

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Authors and Affiliations

  1. Fatigue Testing Division, National Research Institute for Metals, 2-3-12, Nakameguro, Meguro-ku, 153, Tokyo, Japan

    A. Ohta, M. Kosuge & E. Sasaki

Authors
  1. A. Ohta
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  2. M. Kosuge
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  3. E. Sasaki
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Ohta, A., Kosuge, M. & Sasaki, E. Measurement of strain distribution by the moiré fringe multiplication method at a tip of propagating fatigue crack. Int J Fract 13, 289–300 (1977). https://doi.org/10.1007/BF00040145

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  • DOI: https://doi.org/10.1007/BF00040145

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