Ultrasonic Measurement of Thickness and Estimation of Stress Concentration Coefficient Induced by Graphite in Cast Iron

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  • 超音波法による鋳鉄の厚さ測定及び黒鉛による応力集中係数の評価
  • チョウオンパホウ ニ ヨル チュウテツ ノ アツサ ソクテイ オヨビ コクエン

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Abstract

  Ultrasonic methods were applied to measuring thickness and calculating stress concentration coefficient induced by graphite. Thickness of cast iron measurable by the ultrasonic mathod is limited by noise echo scattered at flaky graphite in gray cast iron. The maximum thickness TL (mm) measured by 5MHz probe is proportional to the sound velocity v(m/s) in gray cast iron as : TL=0.022v-58.9. The thickness less than 20mm is unmeasurable in severely corroded cast iron because the incident ultrasonic beam is strongly scattered at the corroded and waved interface. The measureable thickness is limited up to 100mm both in CV and ductile cast iron. This limitation is yielded not by the graphite origin noise echo but by the echo reflected at any planes other than the object bottom plane. Stress concentration coefficients induced by graphite are calculated through ultrasonic sound velocity, tensile strength, Brinell hardness and pearlite area fraction as 1.6 to 4.8 for gray cast iron, 1.25 for CV graphite iron and about 1 for ductile cast iron.

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