Experimental study of the out-of-plane dynamic compression of hexagonal honeycombs
Experimental study of the out-of-plane dynamic compression of hexagonal honeycombs
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DOI：
10.1016/j.compstruct.2012.02.024
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发表时间：
2012-07
影响因子：
6.3
通讯作者：
Shanqing Xu;J. Beynon;D. Ruan;G. Lu
中科院分区：
文献类型：
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作者：
Shanqing Xu;J. Beynon;D. Ruan;G. Lu
对四种铝合金六边形蜂窝在不同应变率下的面外压溃行为进行了广泛的研究，其中每种试验都是在恒定的压缩速度下进行的。研究了试样尺寸、相对密度、应变速率和蜂窝尺寸对蜂窝力学性能的影响。结果表明，平均平台力与样本尺寸呈线性相关。但是，计算的平台应力随试样尺寸的不同而变化，为了表征蜂窝体的整体性能，最小应使用9× 9个单元。当相对密度和应变速率增加时，蜂窝体的强度有很大的提高。切向模量也增加了接近年底的破碎过程中，特别是对于那些蜂窝壁厚与边长比（t/l）的小值。得到了描述相对密度（t/l比）和应变速率对平台应力影响的半经验关系式。讨论了蜂窝材料在准静态和动态加载条件下变形模式的差异。
The out-of-plane crushing behaviour of four types of aluminium hexagonal honeycombs was extensively investigated over a wide range of strain rates where each test was conducted at a constant compressive velocity. The effects of specimen dimensions, relative density, strain rate and honeycomb cell size on the mechanical properties of honeycombs were studied. It was demonstrated that the mean plateau force was linearly related to the specimen dimensions. However, the calculated plateau stress varied with specimen dimensions and a minimum of 9×9cells should be used in order to represent the bulk properties of honeycombs. A large strength enhancement of honeycombs was observed when the relative density and strain rate increased. The tangent modulus also increased towards the end of the crushing process, especially for those honeycombs with small values of wall thickness to edge length ratio (t/l). Semi-empirical relations were obtained to describe the effects of relative density (t/l ratio) and strain rate on the plateau stress. The difference in deformation patterns for honeycombs between quasi-static and dynamic loading conditions was also discussed.