Title : Tests on ecological electrorheological fluid
Abstract:
Currently, due to the increasing automation of machines, "smart materials" are more often used, the properties of which can be changed as a result of external influences. This group of materials includes electrorheological fluids, which change their rheological properties under the influence of an electric field. These fluids are already used in hydraulic components of machines, such as: clutches, brakes, shock absorbers, valves, vibration dampers. Electrorheological fluids most often consist of solid particles, a base fluid and additives. These components can be of natural origin or chemical compounds that have a significant impact on the natural environment.
The new electrorheological fluid with ecological properties presented in the presentation consists of starch, vegetable oil, water as an additive improving the electrical properties of this fluid and herbal extract as an antioxidant. The electrorheological fluid was produced by mixing its individual components. First, the herbal extract was mixed with vegetable oil, and then moist starch was added. The components were mixed using a magnetic stirrer with the possibility of heating the mixture in three stages. The mixing time and temperature were determined based on preliminary tests.
The tests of the ecological electrorheological fluid included the preparation of rheological characteristics (flow curves for valve and shear flow) and electrical characteristics (leakage current, breakdown voltage). Due to the planned use of the ecological electrorheological fluid in hydraulic components, the process of its consumption was taken into account. Based on the analysis of the test results, guidelines were provided for the composition and scope of application and durability of the developed ecological electrorheological fluid.
