両端自由衝撃曲げ試験片の動的応力拡大係数の簡便評価式

概要

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The time variation of the dynamic stress intensity factor is analyzed for a dynamic one-point bending test in which an edge-cracked specimen is impacted at the midspan with a free end supports condition. A simple formula is derived for calculating Euler-Bernoulli beam. Numerical examples are presented to demonstrate the practical applicability of the formula. It is shown that a reasonable accuracy is obtained by the present formula as compared with a finite element computation, and the CPU time is about 1% of the finite element method. Numerical analyses are also performed for a steel specimen impacted by a falling cylinder. The contact force between the specimen and the impactor is eatimaed by applying Huts'S theory to the local deformation near the contact point. It is found that the one-point bending test specimen is fractured during the first jumping, stage.
一般社団法人日本機械学会の論文
1988-05-25