| 金属薄板塑性应变比r值的测量不确定度分析 |
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| 作者单位： | 北京科技大学新金属材料国家重点实验室 北京100083 |
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| 摘 要： | 根据GB/T 5027-1999《金属薄板和薄带塑性应变比(r值)试验方法》标准的要求,利用半自动的测量方法对金属薄板的塑性应变比(r值)了测试。分析了该方法测量r值的B类不确定度以及主要的影响因素,具体影响包括:引伸计的误差和宽度测量的误差。分析结果表明:在半自动测量r值的方法中,应变20%处的r值测量的不确定度最大,应变10%处的最小,而15%处的居中。
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| 关 键 词： | 金属薄板 塑性应变比 不确定度 |
Analysis on uncertainty of plastic strain ratio-r ratio of metallic sheet |
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| Authors: | WANG Lian-qing WANG Jian-guo WANG Hong-ying |
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| Abstract: | Based on the requirements of testing standard of metallic materials-Sheet and strip-Determination of plastic strain ratio(r-ratios),the semiautomatic testing method was used to determine plastic strain ratio of metallic materials sheet-r value.The B type uncertainty of r value and influencing factors were analysed,which includes the errors of extensometer and width measurement.The results show that the uncertainty of r value in 20% strain is the biggest,that in 10% strain the smallest,and that in 15% strain is middle. |
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| Keywords: | metallic sheet plastic strain ratio uncertainty |
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