基于多尺度方法的飞行器结构强度分析

Structural Strength Analysis of Aircraft Based on Multi-scale Method

建立了一套飞行器结构多尺度分析方法,能够较为高效、准确地分析飞行器结构的力学行为,确定危险区域以及研究损伤模式。采用层次多尺度法,分别建立了飞行器整体结构、局部舱段结构、单钉连接模型三种有限元模型,对飞行器结构进行分析。建立了宏观变量与细观响应之间的信息传递和反馈。对三向正交碳/碳机织复合材料的宏观刚度和强度性能进行了预测,建立了宏观损伤起始包络线。采用协同多尺度法对单钉连接模型进行渐进损伤分析。研究表明该方法具有良好适用性,能够较为准确地分析结构的损伤模式,为飞行器结构设计提供参考。

A multi-scale analysis method for aircraft structure was established to analyze the mechanical behavior of aircraft structures, determine the dangerous area and study the damage mode efficiently and accurately. Three finite element models, namely, the overall structure finite element model, the local structure finite element model and the single-nail connection finite element model, were established to analyze the structure of aircraft by using the hierarchical multi-scale method. The information transmission and feedback between the macro variables and the mesoscopic response were established. The macroscopic stiffness and strength properties of the three-direction orthogonal carbon/carbon woven composites were predicted, and the macroscopic damage initiation envelope was established. The progressive damage analysis of the single-nail connection model was carried out by the synergistic multi-scale method. It is shown that the method has good applicability and can accurately analyze the damage mode of the structure. The presented research may provide a reference for design of aircraft structures.