Falling weight testing

Impact Resistance. Tests for impact resistance of porcelain enamels include falling weight tests such as a free-falling ball or a pendulum... 

Impact tests are, however, used to try to compare the impact strength of different materials. Of these tests four require specific mention. These are the Izod test, the Charpy test, the falling weight tests and the tensile impact test. 

Other impact tests widely used are the falling weight tests where a weight is allowed to fall onto a supported flat or domed surface and tensile impact tests in which a sample is subjected to a sudden shock in tension. Whilst the... 

Although the Izod and Charpy tests are widely used for plastics, other types of test are also popular. These include tensile impact tests and flexural plate (falling weight) tests. The latter is particularly useful in situations where the effects of flow anisotropy are being assessed. In addition, arbitrary end-product tests are widely used to provide reassurance that unforseen factors have not emerged to reduce the impact performance of the product. 

IMPACT SENSITIVITY OR SHOCK SENSITIVITY TESTS (Drop Weight or Falling Weight Tests). A list of various tests with refs is given in Vol 1, p XVII. Brief descriptions of US Bureau of Mines (BM) Apparatus and of Picatinny Arsenal (PA) Apparatus are also given on p XVII. British test called Figure of Insensitiveness (FI) is described on p XII (See also Refs 36, 38d, 41, 42, 53, 55b,... 

Marshall 2(1917) Falling Weight Test (Lenze) (p 423) Friction Sensitivity Test (423) Sensitiveness to Detonation (429) Sensitiveness to Heat (434) Ignition Temperature (434) Heat of Explosion (440) Trauzl Test (469) Strength by Ballistic Pendulum (473) Velocity of Detonation by Dautriche Method (479) Brisance Meter of Hess (495)... 

The Impact Test, also called Falling Weight Test was devised by W. Will, SS 1, 209(1906) and by H. Kast, SS 4, 263 (1909) and the history of test was reviewed by H. Koenen et al in Explosivstoffe 8, 178(1958). The test differs essentially from the gap test because its pressures (several hundred, or up to several thousand atmospheres) are much lower and its time scale (hundreds of microseconds, depending on the length of the hammer) much longer. In the test conducted at NOL, a 35-mg sample of expl or propint was placed on a... 

Falling weight test 1 XVII 5 D1550—D1555 ... 

Theory of the Initiation of an Explosion by Falling Weight Tests , DokladyAkadNauk 125 (3), 572—73 (1959) [Technical Information and Library Services Translation TIL/T.5038, British Ministry of Aviation, London (1959)]... 

Many impact tests measure the energy required to break a standard sample under certain specified conditions. The most widely used tests are the lzod test (pendulum-type instrument with notched sample, which is struck on the free end), the Charpy test (pendulum-type instrument with sample supported at the two ends and struck in the middle), the falling-weight test (standard ball dropped from known height), and the high-speed stress-strain test. 

Falling Weight Test. Same as Drop Weight Test. See Impact Sensitivity or Shock Sensitivity Test in Vol 1, p XVII. See also list of Refs on Impact in Vol 4, p D391-R... 

Properties Nitroglycerine high explosive known today. Howrever, there are many other similar liquid nitric esters which have the same explosive properties as NG. Many of these have somewhat inferior blasting power to that of NG (a few are superior) but are more stable towards mechanical shock than NG itself. PGDN is just one such compound, being at least ten times more stable towards mechanical shock than NG. Under the falling weight test, NG detonates at... 

Similarly, falling weight test showed that impact resistance of the filled LDPE samples was lower compared with the neat LDPE (Table 4.15). 

TABLE 4.15 Falling weight test (impact resistance) of filled LDPE, molded samples. For materials—see Table 4.12... 

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