Mogilski Maciej, Jabłoński Maciej, Deroszewska Martyna, Saraczyn Robert, Tracz Jan, Kowalik Michał, Rządkowski Witold
Institute of Aeronautics and Applied Mechanics, Warsaw University of Technology, 00-665 Warsaw, Poland.
Materials (Basel). 2020 Dec 19;13(24):5807. doi: 10.3390/ma13245807.
The aim of this study was to measure the energy absorbed by composite panels with carbon fiber-reinforced polymer (CFRP) skins and a 5052 aluminum alloy honeycomb core and to compare it to previous research and isotropic material-two 25 × 1.75 mm 1.0562 alloy steel tubes. The panel skins layup consisted of pre-impregnated Pyrofil TR30S 210 gsm 3K 2 × 2 twill oriented in directions 0/90 and -45/45 and having a consolidated thickness of 1 mm or 2 mm. The core consisted of a 15 mm or 20 mm honeycomb oriented along its lengthwise direction. The first test consisted of a three-point bending of specimens supported at a span of 400 mm with a 50 mm radius tubular load applicator in the middle. Second, a perimeter shear test was conducted using a 25 mm diameter punch and a 38 mm diameter hole. The results of the three-point bending test show that the energy absorbed by panels with 1 mm skins was similar to the energy absorbed by the tubes (96 J), which was better than the previously considered panels. In the case of perimeter shear, the average maximum forces for the top and bottom skin were 5.7 kN and 6.6 kN, respectively. For the panel with thicker skins (2 mm), the results were about 2 times higher.
本研究的目的是测量具有碳纤维增强聚合物（CFRP）蒙皮和5052铝合金蜂窝芯的复合板吸收的能量，并将其与先前的研究以及各向同性材料——两根25×1.75毫米1.0562合金钢管理论值进行比较。板蒙皮铺层由预浸Pyrofil TR30S 210克/平方米3K 2×2斜纹织物组成，方向为0/90和-45/45，固结厚度为1毫米或2毫米。芯由沿其长度方向排列的15毫米或20毫米蜂窝组成。第一次试验包括对跨度为400毫米、中间有半径为50毫米的管状加载器支撑的试件进行三点弯曲试验。其次，使用直径25毫米的冲头和直径38毫米的孔进行周边剪切试验。三点弯曲试验结果表明，蒙皮厚度为1毫米的板吸收的能量与管吸收的能量相似（96焦），这比之前考虑的板要好。在周边剪切试验中，顶部和底部蒙皮的平均最大力分别为5.7千牛和6.6千牛。对于蒙皮较厚（2毫米）的板，结果约高出2倍。
