Strain Sensitivity in Thick-Film Resistors

Piezoresistive properties of Dupont 1400 series thick-film resistors have been investigated by measuring longitudinal and transverse gauge factors as a function of applied strain between 0 and _+ 1000 microstrain in the temperature range from -70 to + 140°C. The relative change in resistance of thick-film resistors is linear, reproducible, and hysteresis free for the full range of applied strain. They appear more sensitive than metal resistors and have a low temperature coefficient of resistance (TCR) and gauge factor.