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许多试验者不了解拉伸试验中试验系统同心度的重要性,不同心会增加数据的分散性,还会大大地影响某些试验结果。本文全面地分析研究了塑性应变范围的不同心问题,同时对不同心所引起的误差做了估算。结果表明,不同心对应力一应变曲线影响不大。但是,不同心对试样横截面最外层结构的应变有很大的影响。因此,当研究对局部应变中很敏感的性能时,不同心的影响就更为重要了。
Many experimenters do not understand the importance of the concentricity of the test system in tensile tests, which can increase the data scatter and greatly affect some test results. In this paper, the problem of different centers of plastic strain range is analyzed comprehensively and the errors caused by different hearts are estimated. The results show that there is not much difference between the different stress-strain curves. However, different concentricity has a great influence on the strain of the outermost structure of the cross section of the specimen. Therefore, when studying the properties that are sensitive to local strain, the influence of different hearts is even more important.