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σ_(0.2)是材料常温机械性能中的一项重要的性能指标。然而在一般试验中,要准确测定它还是不容易的。用光学引伸计、百分表杠杆式引伸计,电阻应变片等方法或用放大倍数为一百的拉力机虽然能够测定σ_(0.2)值,但不是使用不方便,就是精度不够高,或手续太繁又不经济。且上述各种方法大多不适用于从重要部件上直接取下来的小试样,而这种小试样却日趋增多。国外已有把电阻应变片贴在弹性元件上做成电子
σ_ (0.2) is an important performance index of mechanical properties at room temperature. However, in the general test, it is still not easy to measure it accurately. With optical extensometer, dial gauge extensometer, strain gauge and other methods of resistance or with a magnification of 100 Rally Although the determination of σ_ (0.2) value, but not inconvenient to use, or accuracy is not high enough, or procedures Too complicated and not economical. And most of the above methods are not suitable for small samples taken directly from the important components, but this small sample is increasing. Foreign resistance strain gauges have been made of electronic components made of flexible components