Experiment No.: 1
Measurement of strain by using a basic strain gauge and hence determine the stress induced.
- To measure strain by using a basic strain gauge
- To determine the stress induced
It is a resistive transducer as well as passive transducer and it works on the basis of familier equation of resistance, R= ρ. l/a.
The non electric quantity (Displacement, force, pressure, temperature etc) which has to be measured is applied on such a way that these will change either length or cross sectional area of resistive wire. Resistive wire strain gauges also known as “Piezo-resistive Gauge”. It is used for measurement of displacement, temperature and pressure. As a secondary transducer it also used for measurement of force and acceleration.
|Sl. No.||Applied mass (gm)||Displayed mass (gm)||% Error||Change in voltage (Δeo) (mV)||Input Voltage (ei) (V)|
From the observation table a graph is plotted. Mass v/s change in voltage (Δeo)
Determination of Stress:
Stress= Force/area, Force= mass. gravitational acceleration,
So, calculated stress= m.g/a where, m= applied mass, g= gravitational acceleration, a= elevated surface area of strain gauge.
Taken, g= 9.81 m/s2 and a= _______ m2
|Sl. No.||Mass (gm)||Stress (N/m)|
|Sl No.||Name of Apparatus||Quantity||Specification||Makers name|
|1.||Strain measurement trainer kit||1||Resistive type strain gauge||M.E.W.|
|2.||Weight Box||1||500 gm|
|3.||Digital Multimeter||1||0-750 V AC, 0-10 A||Akademika|