摘要
通过实验方法研究了铝蜂窝夹芯板在入水冲击载荷作用下的压力载荷特性和结构变形机理。首先,搭建了蜂窝夹芯板入水冲击实验平台,开展了不同落体高度下的蜂窝夹芯板入水冲击实验,通过三维扫描仪得到了面板的变形结果,并监测了不同测点的入水冲击压力时程,同时验证了实验的可重复性。在此基础上,研究了蜂窝夹芯板入水冲击过程中的压力载荷特性,并与不同结构的入水冲击压力进行了对比。此外,分析了蜂窝夹芯板的变形模式、最终挠度等特性,给出了面板最终挠度和芯层压缩量的拟合公式。研究结果表明,蜂窝夹芯板表面的入水冲击压力分布不均匀,但在一定落体高度范围内,其压力峰值均与落体高度近似呈线性变化。与刚性平板入水冲击相比,蜂窝夹芯板的入水冲击压力峰值较小。相比同质量的等效铝板而言,蜂窝夹芯板的入水冲击压力峰值更小,压力持续时间更长。不同落体高度下,蜂窝夹芯板的面板变形模式基本一致。随着落体高度的增加,蜂窝夹芯板前面板和后面板中点处的最终挠度近似呈斜率减小的二次抛物线增长。在入水冲击载荷作用下,蜂窝夹芯板后面板的变形明显小于等效铝板的变形,表明蜂窝夹芯板具有更好的抗冲击性能。
The pressure characteristics and structural deformation mechanism of aluminum honeycomb sandwich plates(AHSPs)under water-entry impact were investigated through experimental methods.A self-designed drop experimental platform in the water tank was established,and the water-entry impact experiments of AHSPs at different drop heights were carried out.Meanwhile,the deformation of the face sheets was measured by a 3D scanner,and the time history of water impact pressure at different measuring points was monitored.Furthermore,the repeatability of the experiment was verified.On this basis,the water impact load characteristics of AHSPs during the process of water entry were studied and compared with those of other structures in published papers.In addition,the deformation modes and permanent deflection characteristics of AHSPs were analyzed,and the fitting formulas of the permanent deflection of the face sheets and the compression of the core were proposed.Results show that the distribution of the water impact pressure on the front sheet of AHSPs is uneven.However,within the range of drop heights studied,the peak value of the water impact pressure is approximately linear with the drop height.Additionally,compared to the water entry of rigid plates,the peak value of the water impact pressure of AHSPs is smaller.Compared with the mass equivalent aluminum plates,the peak value of the water impact pressure of AHSPs is much smaller,while the pressure duration of AHSPs is longer.The deformation modes of the face sheets of AHSPs at different drop heights are almost the same.Besides,with the increase of the drop height,the permanent deflections of the front and back faces of AHSPs increase approximately in the form of a quadratic parabola with decreasing slope.Suffering from water entry impact loadings,the permanent deflections of the back sheet of AHSPs are smaller than those of the equivalent aluminum plates,indicating that the AHSPs have better impact resistance compared with the equivalent aluminum plates.
作者
郭开岭
廖永
朱志奎
刘栋
朱凌
GUO Kailing;LIAO Yong;ZHU Zhikui;LIU Dong;ZHU Ling(Key Laboratory of High Performance Ship Technology,Ministry of Education,Wuhan University of Technology,Wuhan 430063,Hubei,China;School of Naval Architecture,Ocean and Energy Power Engineering,Wuhan University of Technology,Wuhan 430063,Hubei,China;Cummins East Asia Research and Development Company,Ltd.,Wuhan 430056,Hubei,China;Wuhan University of Technology Weihai Research Institute,Weihai 264300,Shandong,China)
出处
《爆炸与冲击》
北大核心
2026年第1期47-62,共16页
Explosion and Shock Waves
基金
国家自然科学基金(12202328,12172265)。
关键词
蜂窝夹芯板
入水冲击实验
入水冲击载荷
变形模式
最终挠度
honeycomb sandwich plate
water-entry impact experiment
water-entry load
deformation mode
permanent deflection
