2.5维机织复杂结构件的静强度

采用宏细观结合方法,针对经纱和纬纱等材料组分可能发生的多种失效模式,分别建立了基于改进的Hashin准则的系统性的材料失效准则及不同失效模式下的刚度退化模型.引入逐渐损伤的思想,建立了2.5维机织复杂结构件静强度系统性分析方法.模拟并分析了材料经向拉伸和纬向拉伸的应力-应变曲线,与实验得到的材料应力-应变曲线相比,相同应变下应力误差不超过6.5%,具有较好的重合度;对2.5维机织压气机静子连接结构模拟件开展了逐渐损伤模拟,结果表明:结构损伤主要集中在叶根倒角附近,其中吸力面叶根处的基体压缩失效形式会引起结构大幅变形,是结构破坏的主要原因.

Static strength of 2.5 dimensional woven complex structures

From the perspective of macro and micro combinations, a series of failure criterions and corresponding stiffness reduction methods for multi-failure models of warps and wefts were developed based on modified Hashin criterion. Systematic static strength analytical method for 2.5 dimensional woven complex structures was presented based on gradually damage concept. Also, the tension stress-strain curves along the warp and weft were simulated, and the fitting curves were in good agreement with the experimental results with the errors of calculated stress less than 6.5% for given strains; and for 2.5 dimensional woven connection structure simulation of compressor, gradually damage process was simulated. The result shows that main damage of the structure occurs around the chamfer of the root; specifically, matrix compress failure on the root of suction surface can cause great deformation as a major cause of the destruction of the structure.