依据GB/T 1040．2-2006标准测量聚碳酸酯试样的拉伸屈服强度，选取试样横截面积、重复测试、载荷示值三类影响因素，分别得到拉伸屈服强度不确定度的评定结果。其中，重点分析两种测量方法的不确定度，当聚碳酸酯试样的拉伸强度为72．4 MPa 时，其扩展不确定度分别为0．950 MPa和0．952 MPa。
According to the Standard GB/T 1040. 2-2006,the author measured the tensile yield strength(TYS) of the PC sample. Proceed from three different elements,cross sectional area,retest and loading value,the author gained three different results. Among them,the author analyzed the uncertainty of two methods of measuring. When the tensile strength of the PC arrived 72. 4MPa,the expanded uncertainty were 0. 950MPa and 0. 952MPa separately.
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