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A NON-LINEAR REGRESSION ARISING FROM INVESTIGATION OF PETCH'S FORMULA FOR PROOF STRESS

机译:用于证明应力的pETCH公式调查引起的非线性回归

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In these experiments the 1 % proof strength of short wire specimens has been measured and then measurements of grain size have been made at the ends of the specimen by means of counting the intercepts in a one millimeter gauge length. The average of ten intercept-counts then estimates the grain diameter.nIn this note we shall investigate the best fitting formula of Petch's type and confidence limits for its parameters.

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