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Simulation and Safety Evaluation of Fragments Impacting Shielded Explosive

Author: LiuJiaLiang
Tutor: ChenWeiDong
School: Harbin Engineering University
Course: Solid Mechanics
Keywords: shock initiation maximum entropy method critical velocity probability density experimentation of small sample
CLC: TJ510
Type: Master's thesis
Year: 2009
Downloads: 36
Quote: 0
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Abstract


To carry out the research about the issue of shock and initiation plays an important role in avoiding the happening of accidents for high-explosive weapons in the process of production, transportation and storage. In addition, as the main damage way of anti-missile technology, using high-speed fragments to detonate the incoming warhead is also the question of the impact and detonation.In this paper, large-scale AUTODYN finite element software simulates the process of high-speed fragment impacting and initiating the warhead, analyses the impacts of a variety of random factors on the critical detonation velocity, and then we can fit and get the probability density curve of critical velocity. Meanwhile an authentication method can be proposed. The main contents are as follows:1. Using AUTODYN software to simulate the process of shock initiation and observe the changes of peak pressure inside the explosives in case of "initiation" and "non-initiation".2. Considering the random factors such as fragment size, fragment material density, cartridges material density, shear modulus, explosive sensitivity and so on, and get several groups of critical detonation velocity by using take-off and landing method.3. Programming FORTRAN about maximum entropy method and then fitting the critical speed of the initiation so that we can get its density function of probability and we also can get the speed of detonation threshold by calculation.4. We know threshold detonation velocity by several calculations of simulation procedures and by fitting the results under the program of maximum entropy. However, it needs a further verification to test that if the result is credible. Aiming at the fact that these experiments such like this are expensive and difficult Aiming at the fact that these experiments such like this are expensive and difficult to realize, we bring forward a kind of experimentation of small sample.

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CLC: > Industrial Technology > Arms industry > Explosives,pyrotechnic equipment,Explosive > Explosives > General issues
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