Experimental study on the low velocity impact responses of all-composite pyramidal truss core sandwich panel after high temperature exposure
Experimental study on the low velocity impact responses of all-composite pyramidal truss core sandwich panel after high temperature exposure
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DOI：
10.1016/j.compstruct.2014.06.005
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发表时间：
2014-09-01
影响因子：
6.3
通讯作者：
Ma, Li
中科院分区：
文献类型：
--
作者：
Liu, Jiayi;Zhu, Xiang;Ma, Li
通过实验研究了高温暴露对全复合材料金字塔桁架夹芯板低速冲击行为的影响及损伤机制。复合夹芯板由单向碳/环氧树脂预浸料制成，并暴露在不同温度下 6 小时。对暴露试件进行了三种不同能量水平的冲击试验，分析了暴露温度和冲击能量水平对损伤机制、吸收能量和最大冲击力的影响。随后对冲击损坏的样品进行面内压缩试验，以研究暴露温度和冲击能量水平对压缩破坏载荷的影响。结果表明，高温暴露对试件的冲击性能和损伤机制有显着影响。在低速冲击试验中观察到纤维断裂、节点失效、分层和屈曲，并且损伤区域的范围受暴露温度的显着影响。此外，吸收能量随着暴露温度的升高而增加，而最大冲击力和冲击后的压缩破坏载荷随着暴露温度的升高而降低，这是由于较高温度下基体性能和纤维-基体界面性能的退化。 (C) 2014 Elsevier Ltd. 保留所有权利。
The effects of high temperature exposure on the low velocity impact behaviors and damage mechanisms of all-composite pyramidal truss core sandwich panels were investigated by experiment in this paper. The composite sandwich panels were manufactured from unidirectional carbon/epoxy prepreg and exposed to different temperatures for 6 h. The impact tests of exposed specimens were performed at three different energy levels, and the effects of exposure temperature and impact energy level on the damage mechanism, absorbed energy and maximum impact force were analyzed. The impact-damaged specimens were subsequently subjected to in-plane compressive tests in order to investigate the effect of exposure temperature and impact energy level on the compressive failure load. The results have shown that the high temperature exposure has a significant effect on impact properties and damage mechanisms of specimens. The fiber fracture, node failure, delamination and buckling were observed during low velocity impact tests and the extent of damage area was significantly affected by exposure temperature. In addition, the absorbed energy increased with increasing exposure temperature, while the maximum impact force and compressive failure load after impact decreased with increasing exposure temperature due to the degradation of the matrix properties and fiber-matrix interface properties at higher temperatures. (C) 2014 Elsevier Ltd. All rights reserved.