Aim: Study of strain measurement using strain gauge and cantilever assembly.
Apparatus Required: Scientech 2304 kit Power supply Weights Connecting wires
Theory: The strain gauge module consists of a cantilever beam which is fixed on a rigid body. The strain gauge which are fixed above the beam detects the longitudinal strain and fixed below the beam detects transversal strain. When load is applied on the end of the beam a downward force is exerted. It tends to change the dimensions of the beam. The dimensional changes are sensed by the strain gauge fixed with the beam. The strain on the beam then calculated. The resistance of the strain gauge is changed due to the dimensional change in the beam when the load I applied. Due to this resistance change an unbalanced voltage is developed in the bridge output. This unbalanced voltage is further processed and calculated to give strain directly on the display.
