An Experimental Study on Uncertainties in Strain Measurement of Fixed- Fixed Type Beam

Strain gauges are utilized in many applications like bridges and structural frames for monitoring their health and also monitoring vibrations in rotating elements. Electrical resistance strain-gauge approximately fulfils all of the favourable needs for a strain gauge; therefore it is utilized in stress analysis and as the sensing element. The smallest dimensional change of mechanical elements in response to a mechanical load, pressure, force, and stress causes a change in the resistance of the strain gauge. Wheatstone bridge is commonly employed to convert the resistance change to an output voltage. Most commonly used strain gauge circuit use Quarter bridge, Half bridge and Full bridge orientation. Every strain measuring circuits have some amount of uncertainty linked with it. This research work aims to understand the uncertainties while measuring strain in a fixed-fixed type of beam with static loading conditions. The method adopted for recording the reading experimentally is the deflection method for a Wheatstone bridge circuit.