实验误差对材料参数实验结果影响的估计方法及其指标

A METHOD OF ESTIMATING THE INFLUENCE OF EXPERIMENTAL ERRORS ON THE EXPERIMENTAL RESULTS OF MATERIAL PARAMETERS AND THE CRITERIA TO VALUE THIS INFLUENCE

本文讨论了造成材料参数实验结果分散性的两个来源,给出了估计实验误差对实验结果影响的一般分析方法,提出了评价这种影响的几个指标。本文给出的例子表明这一方法是合理的和有效的。

In this paper the main sources causing the scatteraing of the experimental results of the material parameters are discussed. They can be divided into two partsj one is the experimental errors which are introduced because of the inaccuracy of experimental equipments, the experimental techniques, etc., and the form of the scattering caused by this source is called external distribution. The other is due to the irregulaiity and inhomc-geneity of the material structure and the randomness of deformation process. The scattering caused by this source is inherent and thej] this form of the scattering is called internal distribution. Obviously the experimental distribution of material parameters combined the two distribution in some way, therefore the .experimental distribution of the material parameters is a sum distribution of the external distribution and the internal distribution. On this view, a general method used to analyse the influence of the experimental errors on the experimental results is presented, and three criteria used to value this influence is defined. An example in which the fracture toughness K1c is analysed shows that this method is reasonable, convenient and effective.