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§3—1概述通过前两章的介绍,我们已了解了电测法的基本原理、电阻应变片、电阻应变仪的原理和使用要求。这样,我们就已经掌握了进行电测的基本手段。从本章开始,我们将介绍在各种不同条件下的具体测量方法,这主要包括静态应变测量,动态应变测量等。应变测量的目的一般是:分析机器或构件破坏的原因;验证理论计算的结果与公式;产品强度的鉴定等几方面。为了达到这些目的,往往必须测量构件上应力分布的情况和最大主
§3-1 Overview Through the introduction of the first two chapters, we have learned the basic principle of electrical measurement, resistance strain gauge, resistance strain gauge principle and the use requirements. In this way, we have mastered the basic means of conducting electrical measurements. From the beginning of this chapter, we will introduce specific measurement methods under a variety of different conditions, including static strain measurement, dynamic strain measurement and so on. The purpose of strain measurement is generally: to analyze the causes of damage to the machine or component; to verify the results of theoretical calculations and formulas; identification of product strength and other aspects. In order to achieve these goals, it is often necessary to measure the stress distribution on the component and the maximum primary