金属材料规定非比例延伸强度测量结果不确定度评定.pdf

1 2 , ( 1. , 100074; 2. , 100 12 1) : 讨论了目前对金属材料规定非比例延伸强度Rp0. 2 的不确定度评定的局限性, 通过分析 GB/ T 228- 2002 中非比例延伸 值的确定过程, 将引伸计标距引入的不确定度引伸计测量引入 的不确定度和基准线确定引入的不确定度三 个不确定度分量统 一到一个模型中, 并合成为由引伸 计引入的标准不确定度, 从而解决了目前对引伸计引入的三 个不确定度分量没有数学模型的问题, 确定了新的Rp0. 2 不确定度评定方法, 并运用到实例中进行了计算 : 室温拉伸试验; 不确定度评定; 规定非比例延伸强度; 数学模型 : T G 113. 25 : A : 20 10) Uncertainty Evaluation for Measurement Results of Proof Strength at Nonproportional Extension of Metallic Materials 1 2 WANGJun , WANG uling ( 1. Physicochemic l Ex min tion Center, Beijing Xingh ng Electromech nic l Equipment Pl nt, Beijing 100074, Chin ; 2. Steel Structure Division, Beijing BBEF Science T echnology Co. Lt d. , Beijing 10012 1, Chin ) Abstract: T he current limit tions of uncert inty ev lu t ion for t he proof strength t nonproportion l extension R p0. 2 of met llic m teri ls w ere discussed. By n lyzing t he process of determining t he nonproportion l elong tion force v lue in the st nd rd GB / T 228- 2002, t hree uncert inty components w hich w ere int roduced by extensometer g uge length nd extensometer me surement nd b se line determin tion were unified into single model, combined into the st nd rd uncert inty introduced by extensometer . T he problem of th t there w s no m them tic l model in three uncert int y components ev lu tion introduced by extensometer w s solved. The new uncert inty ev lu tion method for R p0. 2 w s est blished. And the uncert inty of n ex mple w s c lcul ted by the met hod. Keywords: tensile testing t mbient temper ture; uncert inty ev lu tion; proof strength t nonproportion l extension; m them tic l model