Inverse Analysis on the Distribution of Internal Small Defects.

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  • 内部微小欠陥分布の逆解析による推定
  • ナイブ ビショウ ケッカン ブンプ ノ ギャク カイセキ ニ ヨル スイテイ

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Abstract

This paper deals with a method for predicting the three-dimensional distribution of internal defects from the two-dimensional observation of intercepted defects on an inspection plane by an inverse analysis. At first, the fundamental relationships between them were analytically derived on the basis of a statistical model where multiple penny-shaped cracks in an infinite body were intercepted by an inspection plane. The validity of the method was confirmed by a numerical simulation. It was, moreover, applied to small creep fatigue cracks distributing in a smooth specimen of a Type 304 stainless steel, and the volumetric density and the distribution of crack size were successfully evaluated.

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