Abstract
Measurement of strain of tires in-service is effective to improve reliability of tires and ABS system. Since conventional strain gages have high stiffness and require lead wires, the conventional strain gages are cumbersome for the strain measurement of the tires. The backgrounds require a new low cost wireless sensor for tires. In the present study, a new flexible patch-type strain sensor utilizing electric capacitance change is proposed and analytically investigated. The sensor is made from flexible polyimid substrates and flexible epoxy resin whose elogation is 150%. The sensor has quite low stiffness and applicability to large deformation. The capacitance change of the sensor due to applied strain is investigated using FEM analysis. As a result, the sensor is analytically proved to be effective for the strain monitoring of tires.
