| We have developed electronically-controlled small friction test system so as to analyze the response of the friction behavior to exerted electronic-field for Ceramic/Stainless Steel Friction Pair with different water-based lubrication. And this test system is composed of several parts: friction-head feed system; friction-disk rotation system; external voltage-applying system; strain-sensor device; and data measurement /processing system.The feed system is made of a manual three-dimension five-axis’ s precision displacement platform, and a one direction precision slide platform. And the rotation system consists of main shaft, step motor, step motor driver and PLC controller, while the voltage-applying system is accompanied with the auxiliary graphite-electrode. The strain sensor device is realized with dual-parallel cantilever structure, which could decouple the positive pressure and shear friction properly, and demonstrate good linearity, recovery, and resilience, with verifications from ANSYS simulation/calibration experiment. This dual-parallel structure provides us with measurement of pressure and stress separately, and then leads to calculation of friction coefficient.We apply strain-electronic measuring method, that is, we attach four identical strain-sensor on each of the parallel cantilever structure so as to form a full-bridge strain circuit, which convert the strain signal to voltage signal output. We transform this analogue voltage signal to digital signal with data acquisition card, record and process the data with Lab VIEW.We find out the distinctive response of the friction behavior to various exerted electronic field for Ceramic/Stainless Steel Friction Pair with different water-based lubrication with this electronically-controlled test system set-up:(1)The friction behavior of changes of Ceramic/Stainless Steel Friction Pair with exerted electric-field: the friction coefficient increases, with respective to aqueous-sodium-chloride, sodium-dodecyl-sulfate and sodium-lauryl-dimethyl-benzyl-ammonium-chloride-solution. And the response in latter two resolution’s are more manifest than the former one.(2)The relative translational velocity has influence on the electronicallycontrolled friction feature of Ceramic/Stainless Steel Friction Pair for same lubrication: friction coefficient decreases as the translational velocity decreases.( 3) The condensation of aqueous-sodium-chloride does not have a obvious effect on the electronically-controlled friction feature of Ceramic/Stainless Steel Friction Pair. But the current increases hand in hand with condensation with the same exerted voltage. |
