A transducer for measuring interface loads was fabricated, characterized, a
nd demonstrated by measuring coefficient of friction. It is composed of a s
egmented body supported on normal force and shear force piezoelectric senso
rs. The transducer can measure forces normal to and parallel to its surface
simultaneously. It is suitable for inclusion into tribological interfaces
for characterization of friction in laboratory apparatus or monitoring of f
orces in machines for machine and process control.