三维编织圆管力学性能及火箭级间段模拟结构承载能力研究

对于三维四向（４Ｄ）和五向（５Ｄ）两种编织碳／环氧圆管构件及由其组成的火箭模拟级间段，测试其压缩和扭转力学性能及轴压承载能力。实验表明，５Ｄ材料的压缩性能比４Ｄ材料有较大幅度提高，剪切模量提高幅度不明显。用３—细胞模型和ＦＧＭ模型预测相应的力学性能和压缩强度，并与实验结果进行了比较。结果表明，３—细胞模型的结果与实验结果符合较好，ＦＧＭ模拟预测结果偏低。本文结果为编织结构的设计分析提供了依据。

Investigation on Mechanical Properties for Three-dimensional Braided Circular Tubes and the Bearing Capacities for the Analogue Structure of a Rocket Linking-Stage

The compression and torsion behavior for the three dimensional braided C/E 4 D and 5 D circular tubes and the axial compression bearing capacity for the Analogue Structure of Rocket Link stage were investigated by experimental method in this paper. The experimental results show that the compression behavior for 5 D material is superior to 4 D material but the shear modulus for 5 D specimens are nearly the same with 4 D ones. The 3 cell model and FGM model are applied to predict the relative properties and compression strength of the tubes. The comparisons between the theoretical results and the experimental ones indicate that the predict results by 3 cell model are fairly coincident with the experiments, and the predict values by FGM model are lower. The results in this paper are a good basis for the designer of the braid structures.