Pyroshock

<p>Pyroshock, also known as pyrotechnic shock, is the dynamic structural <a href="/facts/Shock_(mechanics)/AjThlASN">shock</a> that occurs when an <a href="/facts/Explosion/Utp8Wv9D">explosion</a> or <a href="/facts/Impact_(mechanics)/dw4Eedzk">impact</a> occurs on a structure.  Davie and Bateman describe it as: "Pyroshock is the response of a structure to high frequency (thousands of hertz), high-magnitude stress waves that propagate throughout the structure as a result of an explosive event such as an explosive charge to separate two stages of a multistage rocket."  It is of particular relevance to the <a href="/facts/Defense_industry/A8mywI9w">defense</a> and <a href="/facts/Aerospace/T6kTLUyV">aerospace</a> industries in that they utilize many vehicles and/or components that use <a href="/facts/Explosive_material/sUme5Pp8">explosive devices</a> to accomplish mission tasks.   Examples include <a href="/facts/Multistage_rocket/WNrmgztj">rocket stage</a> separation, <a href="/facts/Missile/C5VwQClz">missile</a> <a href="/facts/Payload_(air_and_space_craft)/wb7m7LLV">payload</a> deployment, pilot <a href="/facts/Ejection_seat/nl3AmHHI">ejection</a>, automobile <a href="/facts/Airbag/fIygARIw">airbag</a> inflators, etc.  Of significance is the survival and integrity of the equipment after the explosive device has activated so that the vehicle can accomplish its task.  There are examples of flight vehicles Boeing-The Aerospace Corp which have crashed after a routine explosive device deployment, the cause of the crash being determined as be a result of a computer failure due to the explosive device.  The resultant energies are often high <a href="/facts/G-force/F5j4of9l"><i>g</i>-force</a> and high frequency which can cause problems for electronic components which have small items with resonant frequencies near those induced by the pyroshock.
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Pyroshock