【摘要】 针对装有钛合金传感器的C/C复合材料头锥结构,建立包括总体—次级—局部的多级有限元模型,进行细节应力分析技术研究。总体模型中采用较粗的有限元网格,进行初步计算,获得结构的热应力分布趋势和总体应力水平;次级模型中对局部模型的边界条件进行模拟计算,效果较好;局部模型中对细节结构进行精细建模,并采用非线性接触算法获得细节部位弹塑性热应力,与试验结果相符;还对间隙设计进行初步探讨,确定其在0.01mm量级时能大大降低热接触应力,在进一步的结构设计中具有较好的借鉴作用与指导意义。所用计算软件为ANSYS。更多还原

【Abstract】 The global, intermediate and local FEA(finite element analysis) multi-level models were built for the thermal structure of the C/C cone with the metal velocity sensors. In the global model, the primary solution of thermal stress was get for the intermediate model. The intermediate model around one velocity sensor was built, outside of which an imaginary soft material was encompassed to simulate the constraint of the global model. The elastic modulus of the soft material, 1/100 of the cone, was determined numerically in the local model. The refined detail stress is get in the local model, and the clearance in the detailed design is also estimated at about 0.01 mm, which may be referenced in the deep design.更多还原