Plastic Deformation of Ionic Crystals: Statistical Analysis of Yield Stress Measurements

概要

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Statistical methods of data analysis were used to study yield stress measurements of ionic crystals. First, the effect of specimen geometry on the reproductibility of yield stress measurements were studied in order to determine the optimum dimensions and shape of the specimen so as to obtain the most reproductibile measurements. Secondly, the causes of inconsistencies between values of n (the exponent of the power law which expresses the variation of the yield stress gainst impurity concentration) were investigated. A set of values of n obtained with various regression methods and various superposition laws to calculate the impurity-induced-hardening were analyzed by using the variance analysis method. Results of the analysis show that the choice of a superposition law influences the determination of n. The choice of a superposition law together with the lack of a characterization of the aggregation state of impurities are thought to be the main causes of discrepancies between the values of n published over the last ten years.
社団法人応用物理学会の論文
1987-04-20