DID YOU KNOW? DTIC has over 3.5 million final reports on DoD funded research, development, test, and evaluation activities available to our registered users. Click HERE
to register or log in.
EVALUATION OF SONIC SHEAR STABILITY TEST METHODS - LITERATURE REPORT
ROCK ISLAND ARSENAL ILL
There is general agreement among the conclusions of studies on sonic shear breakdown techniques for polymer-thickened hydraulic oils. These conclusions vary only in degree, i.e., from those indicating that this technique is promising, to recommendations that it should replace present-day mechanical pump methods. Sonic shear test methods have a number of advantages over existing pump shear methods These are 1 they are much more rapid, 2 they require smaller test samples, and 3 they are apparently not subject to the frequent mechanical failure of some types of pump test units. In addition, sonic test repeatability is nearly as good as that of the best pump methods. With reference to the nature of the effects on the test fluid, it appears that sonic irradiation and mechanical pump shearing action produce a similar if not identical type of deterioration of polymerthickened oils. Approximate mathematical relationships can be found relating the rate-ofbreakdown of fluids in the sonic irradiation unit to that found in a given mechanical pump test unit. The sonic shear unit most extensively used for hydraulic oil studies is the Raytheon Model DF-101 Sonic Oscillator. Author