TESTING THE EFFECT OF SHEAR MODE AND FLOW MODE PISTON OPERATION IN ADAPTIVE TOOL HOLDER ON THE YIELD STRENGTH OF MAGNETORHEOLOGICAL FLUIDS

• Main Author: Kautsaro Driansyah, Zuan
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/69020
• Institution: Institut Teknologi Bandung

The adaptive polishing tool is a development of the conventional polishing tool that can flexibly adapt to variations in the curvature of the workpiece surface. One element in the adaptive polishing tool is the adaptive tool holder. The tool holder is designed to flexibly adapt to complex workpiece surfaces. The tool holder's adaptability depends on the magnetorheological fluid's properties inside. MR fluid's properties will change if an external magnetic field is applied. The magnitude of the magnetic field that will affect changes in viscosity and yield stress in the magnetorheological fluid is regulated using electric current control. This final project examines the effect of the piston operating mode on the adaptive tool holder on changes in the yield stress of the MR fluid. The piston operating modes used are shear mode and flow mode. The tool holder containing the MR fluid is given a magnetic field through the coil on the piston by varying the electric current. After the piston rod is loaded, the amount of load required to move the piston rod in different magnetic fields is measured. Based on the test result, the tool holder with the shear mode operating mode has a lower yield stress value than the flow mode in the application of the same electric current. However, the piston with the shear mode operating mode has a larger yield stress interval than the flow mode in the variation of the applied electric current