- Conference date: 3–8 August 2008
- Location: Monterey (California)
This paper reports the results of experiments in which samples of degassed monograde lubricants, namely 10 W and 40 Diesel motor oils, are subjected to dynamic stressing by pulses of tension. The pulse reflection technique employed allows the rate of development of tension in the liquid to be varied in a systematic manner, in order to investigate its influence on the resulting measurement of the liquid's cavitation threshold (or ‘effective’ tensile strength), Results are reported for experiments involving a range of stressing rates, from 0.6 bar/μs to 1.4 bar/μs for monograde 10 W and 40 Diesel motor oils over the temperature range These experiments, which are the first of their kind to be reported, indicate that, at any given temperature, increases with increasing stressing rate ( at 25 °C and, at 110 °C for the 10 W oil and at 25 °C and, at 110 °C for the 40 Diesel oil). These results provide evidence to substantiate the claim made by previous workers that the rate of dynamic stressing is an important consideration in understanding the cavitation properties of liquids. The experiments also indicate that stressing rate and temperature are important considerations when evaluating a lubricants performance.
MOST READ THIS MONTH
MOST CITED THIS MONTH
Article metrics loading...