Investigation of Parameters Governing the Damage and Energy Absorption Characteristics of Honeycomb Sandwich Panels
Investigation of Parameters Governing the Damage and Energy Absorption Characteristics of Honeycomb Sandwich Panels
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DOI：
10.1177/1099636207067134
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发表时间：
2007-07
影响因子：
3.9
通讯作者：
G. Zhou;M. Hill;N. Hookham
中科院分区：
文献类型：
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作者：
G. Zhou;M. Hill;N. Hookham
本文研究了不同蒙皮厚度和芯层密度的蜂窝夹芯板在准静态载荷下的弯曲和压痕性能。核心破碎，顶部皮肤分层，和顶部皮肤断裂被确定为主要的损坏机制。它们的特点和能量吸收能力建立使用载荷-位移和载荷-应变曲线和检查的横截面标本。不同的皮肤厚度，芯密度和类型，压头的鼻子形状，和边界条件上的损伤和能量吸收特性的影响进行检查。压头的鼻子形状的变化示出诱导的损伤机制的变化，并具有最显着的影响能量吸收，特别是对于面板相对较厚的皮肤。增加蒙皮厚度不仅显著增加初始阈值和极限载荷，而且显著增加板的吸收能量（AE）。增加芯层密度对极限荷载和能量吸收能力的影响很小，而支承条件对损伤和能量吸收特性的影响很小。较大的220 mm直径的板比100 mm直径的板吸收明显更多的能量，因为其最终位移大得多。由于横向剪切阻力的贡献有限，密度相近的不同芯材在损伤或能量吸收特性上的差异很小。具有分层顶部蒙皮的面板在两种压头下具有较低的阈值载荷，并且HS压头具有较低的极限载荷。
Honeycomb sandwich panels of various skin thicknesses and core densities have been investigated under quasi-static loading in bending and indentation with both hemispherical (HS) and flat-ended (FE) indenters. Core crushing, top skin delamination, and top skin fracture are identified as major damage mechanisms. Their characteristics and energy-absorbing capabilities are established using load—displacement and load—strain curves and inspections of cross-sectioned specimens. The effects of varying skin thickness, core density and type, indenter nose shape, and boundary conditions on the damage and energy-absorbing characteristics are examined. The variation of the indenter nose shape is shown to induce a change in the damage mechanisms and have the most significant effect on energy absorption, especially for panels with relatively thicker skins. Increasing the skin thickness significantly increases not only the initial threshold and ultimate loads but also the absorbed energy (AE) of the panels. Increasing the core density has a very small effect on either the ultimate loads or the energy-absorbing capacity, while the effect of the support conditions on the damage and energy-absorbing characteristics is small. The larger 220 mm diameter panels absorb significantly more energy than the 100 mm diameter panels because of the much greater ultimate displacement. Different core materials with a similar density show little difference in either the damage or the energy-absorbing characteristics due to the limited contribution of transverse shear resistance. Panels with a delaminated top skin have lower threshold loads under both indenters and lower ultimate load for the HS indenter.