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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.
Validierung von BAM-Fallhammer und BAM-Reibapparat - Herausforderung für die Qualitätssicherung
(2016)
Die Validierung des BAM-Fallhammers ist nicht nur eine Frage der dokumentierten Wartung und der Rückführbarkeit relevanter Größen sondern auch eine Frage der Verifizierung der mechanischen Funktion. Dabei gibt es zum Teil derart große Abweichungen zwischen Geräten und von berechneten Werten, dass Ergebnisse zur Schlagempfindlichkeit von Explosivstoffen nur in Verbindung mit der verifzierten Funktion und verifizierten Werten zum Energieübertrag auf den zu prüfenden Stoff nutzbar sind.