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摘要
This paper introduces a novel self-aligning parallel plate fixture for rotational rheometers. The ring-shaped shearing surface of this fixture is held on a low friction single contact point bearing and uses hydrodynamic lubrication forces in order to maintain the parallelism of the freely tilting surfaces over a full rotation. The optimized parallelism of the plates enables to conduct tribological measurements of low frictional stress between the shearing surface materials and a fluid at normal loads down to 1.3 kPa. Limited only by the degree of non-flatness of the surfaces, the new fixture can determine boundary lubrication sliding frictions within 10 % and down to angular velocities of 400 mu rad/s. In a controlled gap mode, this setup reaches a gap error of 3.4 mu m which enables to reliably conduct rheological measurements down to absolute gaps of the parallel plates of 10 mu m and to reach high shear rates up to 10(5) s(-1).
- 出版日期2013-3
