What is the maximum gauge factor purely due to geometrical c

What is the maximum gauge factor \"purely\" due to geometrical change without any piezoresistive effect?

Solution

The gauge factor indicates the strain sensitivity of the gauge in terms of the change in resistance per unit resistance per unit strain. It can be seen that the resistance change in a metal wire due to strain is produced by two factors, namely, the change in specific resistance and the change in dimensions of the wire. In the purely elastic region of deformation of any material, a change in volume is not possible as the wire cannot store energy in these conditions, which means that there cannot be any change in resistivity. Therefore, under constant volume conditions, the gauge factor takes a different value. The factor is constant over its elastic region, thus providing a wide linear stress-strain relationship. The advantages of piezoresistive strain gauge are high sensitivity, small size, and adaptability for both static and dynamic measurements.

Gauge Sensitivity: There will be variation of gauge factors of p- and n-type silicon as a function of resistivity and crystal orientation. The contribution towards the sensitivity from the gauge geometry is insignificant when compared with the piezoresistive effect. Unlike wire gauges, a small The bonding techniques employed are similar to that for wire or foil gauges, except that greater care must be taken in