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Testing of the impact sensitivity of explosives is one of the essential characterisation steps in a safety study. Threshold levels have been agreed from experience for certain processing steps and in relation to handling instructions. However, how reliable is the information, that an explosive has an impact sensitivity of X Joule? This will partly depend on the judgement of the test operator, but also on the statistical method, and on the energetic parameters of the test apparatus. This work focuses on the mechanical performance of the BAM-Fallhammer and how much of the initially available potential energy is transferred to the sample. The differences to the nominal value can be quite large under some conditions. Therefore the energy loss has to be characterised and should possibly be taken into account. In addition an attempt is made, to make results more comparable when the amount of energy loss has been determined by a method shown in the presentation.
Examinations of the mechanical properties of the BAM drop hammer and the BAM friction test were done recently. In order to validate the correct functioning of both tests, usually Round-Robin tests are done with selected test substances. A relatively large spread of the results including some outliers is usually accepted and attributed to the nature of the tests. The author asked, however, in how much the mere mechanical properties could already differ between different institutes, even when no substance is involved (dry runs). A thorough inter-laboratory study was done for the drop test, and results for the friction test are on its way. The current state of these investigations will be presented.
The aim of this study is to quantify how much a real Fallhammer deviates from the idealised functioning, and what the differences between different Fallhammers in different laboratories are. Such a comparison has never been done and data have not been collected in a consistent way. Further it is the aim to develop guidance on the mechanical properties of the Fallhammer, which can be used for internal quality control, validation of the correct functioning of the Fallhammer, and preparation of Round-Robin tests. An established and verified mechanical status of a Fallhammer would greatly improve the quality and comparability of results and Round-Robin tests on the impact sensitivity of explosives.
The BAM-Fallhammer is a mechanical device to test the impact sensitivity of explosives and to determine a sensitiveness level. By its construction it transforms potential energy into kinetic energy of an impacting hammer, then hitting the sample. Ideally the entire potential energy is available at the moment of impact and the supporting base is infinitely rigid. By this study we want to quantify how much a real Fallhammer deviates from the ideal concept, and what the differences between different Fallhammers in different laboratories are. This information has never been collected in a consistent way. The aim of the authors is to develop guidance on the mechanical properties of the Fallhammer, which can be used for different purposes such as internal quality control, validation of the correct functioning of the Fallhammer, preparation of Round-Robin tests and similar. An established and verified mechanical status of a Fallhammer would greatly improve the quality and comparability of results and Round-Robin tests on the impact sensitivity of explosives.