Numerical analysis and experiment of composite sandwich T-joints subjected to pulling load
Numerical analysis and experiment of composite sandwich T-joints subjected to pulling load
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DOI：
10.1016/j.compstruct.2011.06.022
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发表时间：
2011-12
影响因子：
6.3
通讯作者：
Shijun Guo;R. Morishima
中科院分区：
文献类型：
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作者：
Shijun Guo;R. Morishima
本文对复合材料夹层t形接头在拉载荷作用下的破坏机理及替代设计进行了研究。以传统的夹芯t型节点设计为基准，采用有限元方法对夹芯t型节点的抗拉强度进行了数值模拟和分析。考虑了在接头附近腹板上开孔的影响。为了验证模型的有效性，制作并测试了夹芯t型接头样品。对试验结果进行了详细的有限元分析和检查，结果表明，破坏的主要原因是t型连接底板与清缝法兰之间的胶粘剂应力过大。研究了降低t形接头试样强度的制造缺陷。修复后的t形接头试件的实验结果进一步证明了这一点。试验数据与有限元结果具有很好的相关性。为简化t型接头的制造工艺，提出了一种非常规的t型接头设计方法。在此基础上，对t形接头样品进行了建模、制造和测试，以展示制造工艺并评估改进后的强度。
This paper presents an investigation into the failure mechanism and alternative design of composite sandwich T-joints subjected to pulling load. Based on a conventional design of sandwich T-joint as the baseline, numerical modeling and analysis using finite element (FE) method was performed to assess the strength against pulling load. The effect of a cutout in the web panel near the joint has been considered. To validate the models, sandwich T-joint samples were manufactured and tested. Detailed FE analysis and inspection of the experimental results indicated that the failure was mainly due to the excessive stress in the adhesive between the cleat flange and the T-joint base panel. The manufacture defects, which reduced the strength of the T-joint test samples had also been investigated. This has been further demonstrated by experimental results of repaired T-joint samples. A very good correlation between the test data and FE results were obtained. An unconventional design of T-joint for simpler manufacture process was proposed. Based on the design, T-joint samples were modeled, manufactured and tested to demonstrate the manufacture process and evaluate the improved strength.