泡沫铝夹芯板抗冲击性能分析

发布时间：2018-08-31 20:17

【摘要】：试验设计了3块钢板夹泡沫铝夹芯板,厚度分别为50 mm、70 mm和100 mm。对每种厚度夹芯板进行七组不同落锤高度的冲击试验,测得了上、下面板变形值,记录了夹芯板的破坏情况。应用数值模拟软件ANSYS/LS-DYNA进一步还原夹芯板冲击过程,导出了面板与芯材的吸能占比。基于假设的夹芯板理论模型,给出了平均冲击荷载、局部变形和整体变形最大值的估算公式。结果表明:当夹芯板尺寸和材料强度一定时,局部变形值与落锤高度的平方根成正比,整体变形最大值、平均冲击力均与落锤高度的平方根成线性关系。夹芯板的抗冲击性能主要依靠增大泡沫铝芯层的变形进行耗能,芯层越厚,泡沫铝吸能占比越大,局部变形越小,夹芯板受到的冲击力越大。
[Abstract]:Three steel plate sandwich aluminum sandwich panels with thickness of 50 mm,70 mm and 100 mm. were designed. Seven groups of impact tests with different drop weight heights were carried out on each sandwich panel with different thickness. The deformation values of upper and lower panels were measured and the damage of sandwich panel was recorded. The impact process of sandwich panel was further reduced by numerical simulation software ANSYS/LS-DYNA, and the energy absorption ratio of panel to core material was derived. Based on the hypothetical sandwich panel theoretical model, the formulas for estimating the maximum values of average impact load, local deformation and global deformation are given. The results show that the local deformation value is proportional to the square root of the drop weight height, the maximum deformation and the average impact force are linear with the square root of the drop weight height when the size and the material strength of the sandwich panel are constant. The impact resistance of sandwich panel mainly depends on increasing the deformation of aluminum foam core layer. The thicker the core layer, the larger the energy absorption ratio of aluminum foam, the smaller the local deformation, and the greater the impact force of sandwich panel.
【作者单位】：陆军工程大学国防工程学院;
【基金】：国家自然科学基金项目(51478469)
【分类号】：TB383.4;TG146.21

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