Strain gauge

The strain gauge is a measuring instrument used to detect small dimensional deformations of a body subjected to mechanical or thermal stresses (eg application of loads or temperature changes). Knowing a priori the mechanical/physical characteristics of the material, by measuring the deformations it is easy to determine the loads to which the material is subjected. Moreover, by using strain gauges of the right type and applying them carefully, it is possible to detect the direction and direction of these deformations, and consequently the vector of forces applied to the material under examination.

There are many fields of application:

  • laboratory tests on mechanical components or materials;
  • static and dynamic analysis of mechanical components or systems already assembled in situ;
  • monitoring of structural components or systems;
  • sensor element for transducers of mechanical quantities.

Throughout history, various types of strain gauges have been developed, each with peculiar characteristics suited to specific fields of application. Over time, because of their excellent general characteristics, electrical resistance strain gauges have outperformed other types in most applications, so that today, when one speaks of “strain gauges”, one often specifically implies this category.

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