为了此較合理地设计各种机械零件和建筑构件,使它既能滿足技术要求,又能合理地使用材料,即符合又好又省的精神,必需知道它們的应力分布情况。对于大型的器件来說,这更具有特別重大的意义。但外形复杂的零件用理論計算的方法是很艰解决的,因此必需依靠实驗的方法。实驗应力分析方法种类很多,各具有优缺点。而近來,由于电工学、电子学的发展,用电的方法测量非电量正得到广泛的应用。按不同的物理现象将非电量变换成电磁量的变換器有各种不同的形式,如弦式、压电石英式、电容式、(?)应式及电阻式等。利用电阻絲应变片将机械量变为电磁量是其中的一种。应变电阻轉变器即电阻应变仪来測量机械零件和建筑結构的应力和其他力的参数有极其广泛的应用,在頗大程度上是通用的,几乎可以代替其他一切方法,而且所得到的結果也比較可靠 In order to reasonably design various kinds of mechanical parts and building components so as to meet the technical requirements and use materials reasonably well, it is necessary to know their stress distribution. This is especially significant for large devices. However, the complex shape of the parts with theoretical calculations is difficult to solve, it is necessary to rely on experimental methods. There are many kinds of experimental stress analysis methods, each with its advantages and disadvantages. Recently, due to the development of electrotechnics and electronics, the measurement of non-electricity consumption by electricity has been widely used. According to different physical phenomena will be converted into non-electric volume of electromagnetic converter has a variety of different forms, such as string type, piezoelectric quartz, capacitance, (?) Should be type and resistance and so on. The use of resistance wire strain gauge will change the mechanical amount of electromagnetic is one of them. Strain-resistance transformers, ie strain gauges, measure the mechanical and structural stresses and other forces in a wide range of applications and are largely universal and replace almost everything else, and the results obtained Also more reliable