前言用电阻应变片、电阻应变仪确定构件表面的应变、应力状态的实验分析方法称之为应力应变电测技术。这种实验分析方法的一般过程是将电阻应变片固定在被测构件上,当构件受到外力而发生变形时,电阻应变片的阻值也随之发生变化。用电阻应变仪测量出此电阻的变化,再换算成构件上产生的应变或应力(见图1—1)。 Preface The use of resistance strain gauges, strain gauges to determine the strain of the component surface, the stress state of the experimental analysis method called stress-strain electrical measurement technology. The general procedure of this experimental analysis method is to fix the strain gage on the component under test. When the component is deformed by the external force, the resistance of the strain gage will also change. The change in this resistance is measured with a resistance strain gauge and is converted into the strain or stress that is generated in the component (see Figure 1-1).