芯材密度对复合材料夹层梁弯曲力学性能影响

玻璃钢/复合材料 ›› 2016, Vol. 0 ›› Issue (3): 13-17.

芯材密度对复合材料夹层梁弯曲力学性能影响

张富宾,刘伟庆^*,齐玉军,周叮

南京工业大学土木工程学院,南京210009

收稿日期:2015-10-12 出版日期:2016-03-28 发布日期:2016-03-28
通讯作者: 刘伟庆(1964-),男,教授,博士生导师,从事结构工程振动控制、复合材料结构研究,wqliu@njtech.edu.cn。
作者简介:张富宾(1987-),男,博士,从事复合材料夹层结构基本力学性能研究。
基金资助:
国家自然科学基金重点基金项目(51238003);格构增强复合材料框架结构受力机理及设计方法研究(51578285)

EXPERIMENTAL RESEARCH ON FLEXURAL PERFORMANCE OF SANDWICHBEAMS WITH DIFFERENT CORE DENSITIES

ZHANG Fu-bin, LIU Wei-qing^*, QI Yu-jun, ZHOU Ding

College of Civil Engineering, Nanjing Tech University, Nanjing 210009, China

Received:2015-10-12 Online:2016-03-28 Published:2016-03-28

摘要/Abstract

摘要： 研究了聚氨酯泡沫密度对复合材料夹层梁弯曲力学性能的影响。首先,对5种不同密度(48~413kg/m³)泡沫芯材复合材料夹层梁进行三点弯试验研究,结果表明,夹层梁极限承载力随芯材密度的增大而增大;当芯材密度大于等于199kg/m³时,继续增大泡沫密度,夹层梁极限承载力增加速度变慢;随着芯材密度的增加,夹层梁破坏模式由芯材压陷变为面板受压屈服破坏。其次,基于考虑芯材竖向压缩变形的高阶剪切变形理论,对不同试验梁弯曲受力机理进行弹性分析,得到夹层梁上、下面板挠度变化及应变分布规律,并与试验结果对比,验证了理论分析方法的正确性。最后,对试验过程中夹层梁典型的破坏模式进行极限承载力分析,提出其极限承载力计算公式,并与试验结果对比,结果吻合良好。

关键词: 复合材料, 夹层梁, 泡沫芯材, 密度, 弯曲, 极限承载力, 真空导入工艺

Abstract: This paper presents the experimental research on the flexural performance of sandwich beams with high different foam core densities. First, five foam cores with different densities are explored (48~413 kg/m³) using three point bending tests. Test results show that, when the foam core density is less than 199 kg/m³, the ultimate bending strength of the sandwich beams increase with the core density increase, but when the core density is greater than or equal to 199 kg/m³, the ultimate bending strength of sandwich beams tends to a fixed value. The failure mode of the composite beams changed from core indentation failure to face compressive failure as the core densities increase. Second, high-order theory based on variational principle was used to analyze the deflection and the strain distribution of the sandwich beams. Finally, analysis of the ultimate bending strength of the sandwich beams was conducted.

Key words: composite, sandwich beam, foam core, density, bending, failure load, VARTM

中图分类号:

TB332

张富宾,刘伟庆,齐玉军,周叮. 芯材密度对复合材料夹层梁弯曲力学性能影响[J]. 玻璃钢/复合材料, 2016, 0(3): 13-17.

ZHANG Fu-bin, LIU Wei-qing, QI Yu-jun, ZHOU Ding. EXPERIMENTAL RESEARCH ON FLEXURAL PERFORMANCE OF SANDWICHBEAMS WITH DIFFERENT CORE DENSITIES[J]. Fiber Reinforced Plastics/Composites, 2016, 0(3): 13-17.

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