Ryusuke Kitamura

Damage Caused by Dynamic/Cyclic Loading of Detonation Chamber

The plastic damage caused by multiple dynamic loading and its influence on the ductility and toughness of 3.5%Ni-steel (SA203E) and C-steel (SA516M) were examined for the discussion of integrity design of detonation chambers. V-notched specimens and hourglass specimens were welded on 1/7-scale model of a 1-ton explosive class detonation chamber and subjected to 30 detonation shots. It has been indicated that 30 detonation shots caused pre-strain in the specimens. The ductility was reduced by the pre-strain. The Charpy impact toughness was affected as well in a lower temperature. It has been noted that the damage is developed with fatigue crack growth at notch root of the V-notched specimen.© 2011 ASME

A Study on Safer Operation of Impulsively Loaded Vessels

ASME published Code Case 2564 [1] in January 2008 on impulsively loaded vessels, which is the first design guidance of this kind worldwide. The authors participated in the Task Group of Sec. VIII, Div. 3 [2] and were also intimately engaged in development, design and operation of detonation chambers DAVINCH® . DAVINCH® is an acronym for D etonation of A mmunition in V acuum IN tegrated CH amber, utilized for destruction of old non-stockpile chemical weapons, which were recovered from underground and sea in several areas of Japan, China, and Belgium. The quantity destroyed to-date has reached as high as 4,500 items. Figure 1, and 2 show the installations of DV65 at Port Kanda, Japan and DV50 at Poelkapelle, Belgium, with maximum capacity of 65kg and 50 kg TNT-equivalent respectively.Copyright