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本文用30块30CrMnSiA合金铜的CCT试件所测得的ΔK_(th)试验数据检验了随机变量ΔK_(th)的分布特性,确认材料与厚度相同的试件在相同应力比下所测得的ΔK_(th)值基本遵循正态分布。在此基础上对ΔK_(th)试验进行了如下可靠性分析:具有指定可靠度与置信度的ΔK_(th)值,不同材料ΔK_(th)的统计对比,最少试件数。
In this paper, the distribution characteristics of random variable ΔK_ (th) were tested by using ΔK_ (th) test data from 30 CCM specimens of 30CrMnSiA alloy copper. It was confirmed that the material with the same thickness had the same stress ratio The value of ΔK_ (th) basically follows the normal distribution. On the basis of this, the reliability analysis of the ΔK th test is carried out as follows: ΔK th value with specified reliability and confidence, statistical comparison of ΔK th values for different materials, and the minimum number of specimens.