铝蜂窝夹芯板入水冲击动态响应特性实验研究

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中图分类号：0353.4 国标学科代码：13025 文献标志码：A

Abstract：The pressre characteristics and structural deformation mechanism of aluminum honeycomb sandwich plates （AHSPs）under water-entryimpact were investigated through experimental methods.A self-designed dropexperimental platforminthe water tank was established，andthe water-entryimpact experimentsof AHSPsatdiferent dropheights were carriedout.Meanwhile，the deformationof theface shets was measured bya3Dscanner，andthe time historyof water mpact pressure at diferent measuring points was monitored.Furthermore，the repeatabilityof the experiment was verified. On this basis，the water impact load characteristics ofAHSPs during the processof water entrywere studiedandcompared with those ofotherstructuresinpublishedpapers.Inadition，thedeformationmodesandpermanentdeflectioncharacteristicsofAHSPs wereanalyzed，andthefitingformulasofthepermanentdeflectionof thefaceshetsandthecompressionofthecorewere proposed.Results show that the distributionof the water impact pressure on the front sheet of AHSPs is uneven.However， within therange of drop heights studied，thepeakvalueof the water impact presure is approximately linear with the drop height.Additionaly，compared to the water entryofrigid plates， the peak value of the water impact pressureof AHSPsis smaller. Compared with the mass equivalent aluminum plates，the peak value of the water impact pressure of AHSPs is much smaller，while the pressure durationofAHSPs islonger.Thedeformation modesof theface sheets of AHSPs at diffrent drop heights arealmosthesame.Besides，withthe increase ofthe dropheight，thepermanentdeflections ofthefrontand back faces of AHSP increaseapproximately in the form ofa quadratic parabola with decreasing slope.Suffering from water entry impact loadings，the permanent deflectionsof theback sheet of AHSPsare smaller than thoseof the equivalent aluminum plates， indicating that the AHSPs have better impact resistance compared with the equivalent aluminum plates.

Keywords：honeycomb sandwich plate; water-entry impact experiment; water-entry load; deformation mode;permanent deflection

结构入水冲击问题广泛存在于军事和民用领域，如船体结构入水冲击、无人潜航器投放、水上飞机降落、海上救生艇抛落、跨介质航行器入水等，是船舶与海洋工程、航空航天等领域中的重点和难点问题之一[1-3]。（剩余17216字）