三次元表面き裂の動的応力拡大係数と動的ラインスプリングモデル

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  • Dynamic line-spring model for the simplified analysis of the dynamic stress-intensity factor for 3-D surface cracks.
  • 3ジゲン ヒョウメン キレツ ノ ドウテキ オウリョク カクダイ ケイスウ ト

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A dynamic line-spring model is proposed for the simplified analysis of the dynamic stress-intensity factor for part-through surface cracks. A plate containing two surface cracks is modeled as a 2-D plate in plane stress with a through crack. Surfaces of the through crack are connected by dynamic line-springs distributed continuously along the through crack. In the case of static loading, the present model reduces to the static model proposed by Rice and Levy. As an example of the application of the present model, the dynamic response of a plate containing two semi-elliptical surface cracks is analysed where the plate is subjected to a vibrating stress at its ends. It is found that the dynamic stress-intensity factor takes its maximum value at the deepest penetration point of the surface crack and begins to increase markedly near the first resonance frequency as the frequency of the applied stress increases.

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