CAJ | 학술논문

为评定深冲钢塑性应变比(r值)的测量不确定度,以厚度规格为80 mm的St14试样为例,建立了计算r值不确定度的数学模型,确定了影响r值的各项因素,主要有试样原始宽度及其变形、试样原始标距及其变形4个输入量引入的不确定度和数值修约带入的不确定度,计算出了各因素的标准不确定度,r值的扩展不确定度为0.08,St14试样r值最终测量结果表达式为r=1.84±0.08.
위평정심충강소성응변비(r치)적측량불학정도,이후도규격위80 mm적St14시양위례,건립료계산r치불학정도적수학모형,학정료영향r치적각항인소,주요유시양원시관도급기변형、시양원시표거급기변형4개수입량인입적불학정도화수치수약대입적불학정도,계산출료각인소적표준불학정도,r치적확전불학정도위0.08,St14시양r치최종측량결과표체식위r=1.84±0.08.
In order to evaluate the uncertainty in measurement on plastic strain ratio(r value)of deep drawing steel, making St14 steel of thickness 80 mm as an example, the mathematic model of calculating uncertainty of the r value was established and the factors affecting the r value were determined, which include the uncertainties led into by 4 inputs, that is, original width of simple, the forming in width direction, the original gauge length and its distortion, and taken by rounding off numerical values. The standard uncertainty of each factor was calculated. The expanded uncertainty of the r value is 0.08, and the ultimate expression of measuring result of St14 simple r value is r=1.84±0.08.