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前言 电阻—应变测试方法(简称电测)是一种极其有效的应变,应力测试手段。它除具有灵敏度高,量测速度快,易于实现自动,同步和遥测的优点外,一般不致改变试件的受力状态,且能获取受荷过程中任意时刻(其中包括破坏瞬间)的应变值,如果配用相应的记录仪表(如x—y仪)还可直接获得全过程的应力应变曲线。同时,电测还具有广泛的适应性,它除用于一般的室温环境外,还可用于高、低温,高压液下,高速旋转和高温高压,以及有放射性污染条件下的模型和实体结构的应变、应力测试。因此,电测技术已成为应力分析不可缺少的重要手段之一。
Introduction The resistance-strain test method (abbreviated to electrical test) is an extremely effective strain and stress test method. In addition to its high sensitivity, fast measurement speed, easy to implement the advantages of automatic, synchronous and telemetry, it generally does not change the stress state of the test piece, and can acquire the strain value at any time during the charge process (including the moment of destruction). If you use the corresponding recording instrument (such as x-y instrument) can also directly obtain the stress and strain curve of the whole process. At the same time, electrical measurement also has a wide range of adaptability. It can be used for high and low temperature, high pressure liquid, high speed rotation and high temperature and high pressure, as well as models and physical structures under radioactive contamination conditions, in addition to the general room temperature environment. Strain, stress test. Therefore, the electrical measurement technology has become one of the indispensable important means of stress analysis.