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Main Authors:	Junwu Zhu, Yanqing Wu, Lin Ao, Kun Yang, Liying Dong
Format:	Artículo Open Access
Published:	Wiley 2025
Subjects:	Propellants, Explosives, Pyrotechnics
Online Access:	https://onlinelibrary.wiley.com/doi/10.1002/prep.70079
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Solid Filler Shear‐Dominated Ignition for Puncturing High‐Energy Propellant Junwu Zhu Yanqing Wu Lin Ao Kun Yang Liying Dong Propellants, Explosives, Pyrotechnics ABSTRACT Puncturing is one of the accidental mechanical stimuli faced by solid engines, which may lead to ignition of the high‐energy propellant and cause severe casualties. However, the complex composition and heterogeneous mesostructure of the propellant, combined with limitations in diagnostic techniques, have hindered a comprehensive understanding of its ignition mechanisms. To investigate the ignition mechanisms of propellant puncture, a visualization experiment was designed to observe the ignition process, and the ignition‐initiating components were identified by in situ energy dispersive spectroscopy (EDS). The results indicate that the ignition originates from the ammonium perchlorate (AP) particles in the inner edge annular region of the loading area. Shear‐induced energy localization rather than bulk heating dominated the ignition process. 10.1002/prep.70079 http://onlinelibrary.wiley.com/termsAndConditions#vor

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// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return 0; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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