摘要
考虑一体化成型工艺制备的复合材料点阵夹芯结构及其不确定性,采用区间向量实现不确定参数定量化,建立复合材料点阵夹芯结构平压性能区间分析模型。考虑结构功能状态判断的模糊性,分别在不考虑设计容差与考虑设计容差情形下,建立了不确定平压载荷作用下含区间参数模糊可靠性分析与优化模型。研究结果表明:材料参数及结构参数不确定性,特别是设计容差对复合材料点阵夹芯结构平压性能影响明显,因此在工程优化中不仅需要充分考虑材料参数与外部载荷等不确定性,而且需要充分重视传统不确定设计方法中未计及的设计容差的影响。本研究实现了理论成果与工程应用的有机结合,为工程领域复合材料点阵夹芯结构平压性能分析与优化提供有效理论方法。
The uncertainties in all-composite lattice truss core sandwich structure by integral forming process were quantified by an interval vector and the interval analysis model of flat crush resistance of lattice truss core sandwich structure was established. Considering the fuzziness in failure criterion of the structure, analysis and optimization models of fuzzy reliability containing interval parameters were constructed in two different cases： one was with the consideration of design tolerance induced by the production process and the other not. The results show that uncertainties in materials and structures, especially design tolerance, had great impact on the flat crush resistance of all-composite lattice truss core sandwich structure. Not only uncertainties in materials and external loads, but also design tolerance ignored in conventional uncertain design methods, should be considered fully in optimization of lattice truss core sandwich structure. The organic combination of the theoretical result and engineering application achieved in this paper presents an effective method for the analysis and optimization of flat crush resistance of all composite lattice truss core sandwich structure in engineering.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2013年第4期177-184,共8页
Acta Materiae Compositae Sinica
基金
国防基础科研计划项目(A212011001
B2120110011)
国家自然科学基金(10872017
90816024
10876100)
"111"计划(B07009)
关键词
不确定性
复合材料
点阵夹芯结构
可靠性
压缩性能
不确定分析与优化
uncertainties
composite materials
lattice truss core structure
reliability
compressive property
uncertain analysis and optimization
