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通过一个数学模型的建立研究了试样几何的原始尺寸影响薄板r值的变化规律。结果为:当r值是应变的增函数(或减函数)时,r值随试样几何原始尺寸的增加而减小(或增大);当r值是应变的常函数时,试样几何原始尺寸的变化对r值没有影响。
Through the establishment of a mathematical model, the influence of the original size of the sample geometry on the variation of the r value of the sheet was investigated. The results are as follows: when r is an increasing function (or a decreasing function) of strain, the value of r decreases (or increases) with the increase of the original geometric size of the sample; when r is a constant function of strain, The change in the original size has no effect on the r value.