针刺C/C圆筒构件内/外压试验与仿真研究

External and Internal Hydro-Proof Test and Simulation Investigation on Needling C/C Composite Cylinder

根据某扩张段采用的针刺C/C复合材料制备圆筒构件试验件,设计外压和内压试验工装,对其开展内外压试验研究,总结结构应力分布规律,并与有限元仿真结果进行对比,仿真结果与试验结果一致性较好,获得了准确高精度3D圆筒构件水压仿真计算模型。试验及仿真结果对于改进固体火箭发动机针刺C/C复合材料喷管扩张段结构设计,修正材料本构模型参数,预估结构安全裕度有着重要的参考价值。

The external and internal hydro-proof test investigation of the cylinder structures are developed in the present paper. The needling C/C composite cylinder sample preparation and the fixture are designed according to the testing condition. The stress distribution information of the structures is obtained during the test process. The 3D hydro-proof FEM simulation model is established to compare with the experiment results. The simulation results are in good agreement with the test results ,which indicates the validity and accuracy of the FEM simulation model. The test and simulation conclusions can provide some important guidance for the nozzle carbon/carbon composite with cone structure design, material constitutive model parameter modification and structure safety tolerance prediction.