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摘要: 基于流体弹塑性模型,建立了泡沫铝在爆炸载荷下的冲击特性方程。采用Lagrange差分格式,在 均匀网格上对方程进行了离散。编写了数值计算程序,进行了炸药在空中和水中爆炸的一维数值计算。爆炸 场中考虑了泡沫铝密度、环境介质对泡沫铝材料冲击特性的影响。结果表明:数值计算结果与理论解、实验实 测结果基本吻合,证明所建立的泡沫铝的流体弹塑性本构方程可以用来描述泡沫铝的冲击特性;泡沫铝的密 度越低,泡沫铝中的压力峰值越小;在接触爆炸条件下,泡沫铝外侧环境介质的性质对临近环境介质端泡沫铝 中的压力影响明显,其中,环境介质若为空气,则临近空气端泡沫铝中的压力呈下降趋势,若环境介质为水,则 临近水端泡沫铝中的压力呈上升趋势。Abstract: Basedonthehydrodynamic-elastoplasticmodel,theequationswereestablishedtocharacterizetheimpactpropertiesoftheAlfoamsunderexplosiveloading, whichweretransformedintodiscreteLagrangedifferenceformsinuniformgrid. TheshockresponsesoftheAlfoamsinwaterandair werenumericallycalculatedbytheself-developedone-dimensionalcode,respectively.Thenumerical resultsareinagreementwiththetheoreticalsolutionsandtheexperimentalones.Underthesameexplosiveloading, thelowerthedensityoftheAlfoam,thelowerthepeakpressureinit.Andundera contactexplosiveloading,thepropertiesofthematerialssurroundingtheAlfoamcanmarkedlyaffect thepressureonitsouterside.WhenairisoutsidetheAlfoam,thepressureintheAlfoamadjacent toairtakesonadownwardtrend.WhenwaterisoutsidetheAlfoam,thecorrespondingpressure takesonanupwardtrend.
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Key words:
- mechanicsofexplosion /
- peakpressure /
- finitedifference /
- aluminumfoam
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