# How do you measure torque with a strain gauge?

## How do you measure torque with a strain gauge?

How is Torque Measured? A strain gauge converts torque into an electrical signal. The sensor is bonded to a rotating shaft that deforms when a torque is applied. Generally, four strain gauges are attached to the rotating shaft in the form of a Wheatstone bridge circuit.

### What is strain gauge torsion meter?

A general configuration of a strain gauge bridge circuit widely employed for torque measurement from a rotating shaft is shown in figure . Figure. Strain Gauge Torsion Meter. Four bonded-wire strain gauges are mounted on a 45° helix with the axis of the rotation; and are placed in pairs diametrically opposite.

How are strain gauges used to measure torque?

MIcro-Measurements Strain Gauges provide solutions to measure Shear and Torque forces in a variety of applications. When the shaft is loaded in torsion, it creates a state of pure shear and the applied torque can be found by orienting rosettes where the gridlines are positioned at 45 degrees to the axis of the shaft.

Can a strain gage measure pure shear strain?

Torque loads cause shear strain in the structure to which the torsional loads are being applied. This is a good thing, because strain gages can measure these shear strains. That’s actually not a precisely true statement. Bonded electrical resistance strain gages do not respond to pure shear strains.

## How big is a micro-measurements Rossette strain gage?

Micro-Measurements’ Shear/Torque Rossette Strain Gages are uniquely designed for measuring shear strain and torque. They are available in both single and multiple grid patterns and in lengths ranging from 0.062” (1.57 mm) to 0.250” (6.35 mm).

### How is the strain measured in bonded resistance Gage?

This is the strain that we typically measure with a bonded resistance strain gage. Strain may be either tensile (positive) or compressive (negative). See Figure 2. When this is written in equation form, \= L/L, we can see that strain is a ratio and, therefore, dimensionless.