金属材料规定非比例延伸强度Rp0.2测量结果的不确定度评定

根据JJFl059—1999《测量不确定度评定与表示》的要求,系统地对GB／T228—2002《金属材料室温拉伸试验方法》中规定非比例延伸强度Rp0．2测量结果的不确定度进行了评定。针对金属材料力学性能检测领域的测量结果不确定度特点,选用了性能相对均匀的不锈钢板为试验材料,分析了试验过程中方法、设备、量具、人员和环境等不同因素对测试结果的影响程度。结果表明,试验条件下的非比例延伸强度Rp0．2测量结果的相对不确定度为2．55％。

UNCERTAINTY EVALUATION FOR THE MEASUREMENT RESULTS OF THE PROOF STRENGTH AT NON-PROPORTIONAL EXTENSION Rp0.2 OF METALLIC MATERIALS

According to the requirements of the standard JJF1059-1999 "uncertainty evaluation and denotation of the measurement results", the uncertainty for the measurement results of the proof strength at non-proportional extension R_(p0.2)of metallic materials which was stipulated in the standard GB/T228-2002 "metallic materials-tensile testing at ambient temperature" was evaluated. With concerning about the characteristics of uncertainty of the metallic mechanical property, a kind of stainless steel was taken as the specimen due to its relative homogeneous property. After the effect level of the different factors such as method, equipment, measuring tool, inspector, and environment was analyzed. The relative uncertainty of measurement results of the proof strength at non-proportional extension R_(p0.2)of was 2.55% in this test conditions.