金属材料拉伸试验结果测量不确定度评定研究  

Evaluating Study on Measuring Uncertainty of Tensile Test Result of Metallic Material

作　　者：高波[1] 刘杰[1] 孙岭[1] 宋保霞[1] 郭玉香[1] 

机构地区：[1]济南钢铁集团总公司,山东济南250101

出　　处：《山东冶金》2004年第1期54-56,共3页Shandong Metallurgy

摘　　要：为评定金属材料拉伸试验的结果测量不确定度 ,以轧制厚度为 18mm的Q2 3 5B板材矩形带头短比例试样为例 ,建立了不确定度计算的数学模型 ,确定了影响试验结果 (ReL、Rm)的下屈服力FSL、最大力Fm、试样原始厚度a及试样原始宽度b等各项因素 ,计算出了各种因素的标准不确定度 ,得出拉伸试验结果 (ReL、Rm)的扩展不确定度 ,并给出最终测量结果的表达式 :下屈服强度ReL、抗拉强度Rm的最终测量结果分别为 (3 0 5± 5 )MPa和 (4 3 5± 10 )MPa。In order to evaluate measuring uncertainty of tensile testing result of metallic material, the mathematic model of calculating uncertainty is established and different factors of influencing testing result are determined taking rectangle head shorter proportional sample of 18mm Q235B plate as example. These factors consist of lower yield force F _(SL), tensile force F _(m), original thickness of sample a and original width of sample b and so on. The standard uncertainty of different factors are calculated, the expanded uncertainty of tensile testing result ( R _(eL) R _(m)) is figured out and the ultimate expression of measuring result is listed. The ultimate measuring result of lower yield strength R _(eL) and tensile strength R _(m) are (305±5) MPa and (435 ±10) MPa respectively.

关 键 词：金属材料 拉伸试验 测量不确定度 标准不确定度 扩展不确定度 Q235B 

分 类 号：TG142.15[一般工业技术—材料科学与工程] TG115.52[金属学及工艺—金属材料]