Test method drop-weight

Accordingly, it was deemed a substance too dangerous to be produced in an ordinary chemical plant. On the other hand, it was also found that its dangerous properties were not easily identified by some commonly practiced test methods an ordinary differential thermal analysis did not give a result suggestive of the danger, and a drop weight sensitivity test of solid 5-CT indicated that the substance was insensitive to percussion. 

Starting with Bowden and Yoffe s adiabatic compression hypothesis, a method and apparatus (the Olin-Mathieson (O-M) drop-weight tester) were adopted by a committee on test methods (11). The technique was... 

Liquid Propellant Test Methods, Test No. 4, Drop-Weight Test, Chemical Propulsion Information Agency, The Johns Hopkins University Applied Laboratory, Silver Spring, Md., 1964. 

For conditions of constant craze thickening rate, agreement between prediction and experiment is already very encouraging, particularly at higher speeds. There are still refinements to be made to the experimental method, and drop-weight striker speeds of less than 0.5 m/s will remain inherently difficult to control. Nevertheless, the Full Notch Impact test provides a promising direct method for the measurement of cohesive properties in tough polymers. 

In the test method for molecular weight (ASTM D-2503) a small sample of wax is dissolved in a suitable solvent, and a droplet of the wax solution is placed on a thermistor in a closed chamber in close proximity to a suspended drop of the pure solvent on a second thermistor. The difference in vapor pressure between the two positions results in solvent transport and condensation onto the wax solution, with a resultant change in tempera-... 

Impact Resistance of Plastic Film by the Free-Falling Dart Method. Primary Film Test Method ASTM D1709 Additional Test Method ISO 7765-1. A weighted dart is dropped from a standard height onto a taut sample. Depending upon the expected impact strength of the test sample, either method A or method B is chosen. The method defines the dart size and the drop height for the dart. Test method A specifies a dart with a 38 mm diameter dropped from 0.66 m. Test method B specifies a dart with a 51 mm diameter dropped from 1.5 m. 

Standard Method for Conducting Drop-Weight Test to Determine Nil-Ductility Transition Temperature of Ferritic Steels, E-208, 1975 Annual Book of ASTM Standards Part 10, ASTM, Philadelphia, Pennsylvania (1975). 

ASTM (2006), Standard Test Method for conducting drop-weight test to determine nil-ductility transition temperature of ferritic steels, E 208-06, American Society for Testing and Materials International, West Conshohocken, PA. 

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