一方向強化複合材内の繊維破断を利用した強化繊維の新しいワイブル母数推定法　Ｉ　　シミュレーションによる検討

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  • New estimating method of Weibull parameters by fiber fractures in unidirectional composites. 1st report. Consideration based on Monte-Calro simulation.
  • 1ホウコウ キョウカ フクゴウザイナイ ノ センイ ハダン オ リヨウシタ キ

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A new estimating method of Weibull parameters has been examined, using the strength data of individual fiber fractures, what we call "singlet", in unidirectional composites by a Monte-Calro simulation, on the assumption that the fiber fractures can be acoustically counted by a non-destructive inspection. This method is based on the realization that the i-th weak fiber fracture i-thly in the composites, and the strength scatters upon trying the tensile-test several times. That is to say, the strength is a random variable based on the order statistics, and the Weibull parameters can be estimated by joint distribution of the first several order statistics. The results showed that the accuracy of the estimation became good with an increase in the number of the singlets, and the sample number of 30 and 50 gave good accuracy. Additionally, the recursion analysis technique proposed by Harlow and Phoenix was employed to investigate the effects of the stress concentration caused by the adjcent fiber fractures. The limit of the number identified as singlets was found for some composite sizes.

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