# MFGE Unité de Détermination du Facteur de Jauge de Jauges de Contrainte

## SYSTEMES INNOVANTS

The Unit for Determining the Gauge Factor of Strain Gauges, "MFGE", allows to determine experimentally the gauge factor of strain gauges in function of the strain generated on the bar when it is subjected to pure bending.

Voir description générale

## Description Générale

The Unit for Determining the Gauge Factor of Strain Gauges, "MFGE", allows to determine the k factor of strain gauges.

The bar rests on two supports with ball bearings, so that it is possible to work with a load under pure bending.

To perform such determination two point loads must be applied to the bar, with the load application handwheel, connected to a cross-arm, through a spindle that, when rotating the handwheel, leads to the application of a force in two points of the bar with vertical direction downwards. This force causes a deformation on the bar.

There is a dial gauge, to measure the deformation generated. The dial gauge measures the maximum deformation, which is given in the center of the bar.

At the same time, the deformation generated on the surface of the bar is registered by two strain gauges in the compression side and other two strain gauges in the tension side, forming a full Wheatstone bridge. The strain value, expressed in volts, will be read in a console that amplifies the signal of the strain gauges.

The gauge factor (k) can be calculated from the displacement values obtained and the strain gauges measurements.

## Des exercices et pratiques guidées

### EXERCICES GUIDÉS INCLUS DANS LE MANUEL

1. Fundamentals of measuring with strain gauges.
2. Displacement measurement with a dial gauge.
3. Determination of the k factor of strain gauges.
4. Comparison of the experimental values obtained by strain gauges with theoretical values.
5. Determination of the reactions generated when the bar is subjected to a load.
6. Determination of the bending moments generated when the bar is subjected to a load.
7. Determination of the angle of rotation generated when the bar is subjected to a load.

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