Effect of Spatial Distribution of Material Properties on the Experimental Estimation

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Other Title
  • 材質の空間的変動の材料試験結果に及ぼす影響について
  • ザイシツ ノ クウカンテキ ヘンドウ ノ ザイリョウ シケン ケッカ ニ オヨ
  • 材質の空間的変動の材料試験結果に及ぼす影響について : その2 疲労き裂伝播に及ぼす板厚の影響
  • Part 2 Effect of Specimen Thickness on Fatigue Crack Growth
  • その2 疲労き裂伝播に及ぼす板厚の影響

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Abstract

The purpose of the present study is to investigate the effect of specimen thikcness on statistical properties of crack growth resistance. In this study, the resistance Sδh (x) to fatigue crack growth was treated as a spatial stochastic process, which varies randomly on the crack surface. The theoretical autocorrelation functions of the resistance to fatigue crack growth considering specimen thickness are discussed for several correlation lengths. Constant ΔK fatigue crack growth tests were performed on the high strength steel (BS 4360) specimens with different thicknesses. Applying the previously proposed stochastic model, the experimental data were analyzed for the different specimen thicknesses to determine the autocorrelation functions and probability distributions of the resistance. The main results obtained are : (1) Mean fatigue crack growth rate decreases with decreasing specimen thickness. (2) The autocorrelation functions of Sδh (x), both in the theoretical and the experimental, are almost independent of specimen of specimen thickness except for the orgin. (3) The variance increases with decreasing specimen thickness. (4) The probability distribution functions of Sδh (x) obtained from experimental data are 3-parameter Weibull and show a slight dependence on the specimen thickness.

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