FRM内の最弱繊維破壊によるワイブル母数の推定とFRMの強度評価

概要

論文の詳細を見る
A method for estimating the Weibull Parameters of reinforcing-fiber embedded in a matrix has been proposed. In general, the weakest fibers fracture first in FRM, and the strength is variable as shown by tensile-testing 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 applying a single Weibull distribution to it. B_4C coated boron fiber reinforced Al composites produced by hot-pressing were employed as the test materials. The fracture of the weakest fibers was identified by the AE method. The result showed that the shape parameter obtained from the present method gave a smaller value compared to that obtained from the conventional extracted-fiber test, and the scale parameter gave a larger value. Using these Weibull parameters, the strength distribution curves of the composites, reported by Harlow-Phoenix, were predicted. The curves by the present parameters were in good agreement with the experimental data of the composites, as compared with the those by the conventional test parameters. Additionally, the efficiency of the present method was discussed from the Weibull parameters converted by the moment method, on the condition that the fiber strength was given by the bi-modal Weibull distribution.
一般社団法人日本機械学会の論文
1988-04-25