Science and Technology of Energetic Materials

Vol.68, No.4 (2007)

Research paper

Study on the simultaneous explosion of fireworks shells by the gap tests in sand
— Judgment on simultaneous explosions and deductions of simultaneous explosion numbers of fireworks shells by pressure and noise measurements —
Koki Ishikawa, Shuji Hatanaka, Norihide Suruga, Eishi Kuroda, Kunihiko Wakabayashi, Tomoharu Matsumura, and Yoshio Nakayama


One of the United Nations Classification Tests, i.e., a 6(b) stack test, was conducted in order to study the classification and its test procedures for fireworks shells. Fireworks shells of 180 mm or larger in diameter are classified as hazard division 1.1 on the classification table. Therefore, the fireworks shells that correspond to such a dangerous division can come under a large handling influence.

The test was conducted by selecting four kinds of samples with different structure, amount of the bursting charge and chemical composition of the star from among the 240 mm color shells (Palm Tree, Butterfly, Brocade Crown and Three color- changing). The inner and external pressure of the shells and the noise generated by the tests were measured to investigate simultaneous explosion, and to deduce the simultaneous explosion number of the shells. The following results were obtained.
1) The acceptor shells caused explosion simultaneously with the donor shell when the inner pressure of the acceptor shells was high.
2) It was possible to deduce effectively the simultaneous explosion number of the shells by measuring the noise.
3) "Butterfly" was classified as hazard division 1.1, and the other shells were classified as 1.3 hazard division candidates.

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Simultaneous explosion, Fireworks shells, Gap tests in sand, Pressure and noise measurements.

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