加筋强化复合材料蜂窝夹层结构压缩失效分析
发布时间：2019-05-09 04:51
【摘要】：复合材料蜂窝夹层结构以其高效轻质的特点被广泛应用于多个工业领域。近年来,随着工程应用领域对高性能轻质结构的要求越来越高,促进了新的夹层结构形式的大幅发展。其中,通过在蜂窝芯中铺设加强筋而得到的加筋强化复合材料蜂窝夹层结构就是一种新型结构形式,其目的是为了进一步均衡地提高结构轴向和弯曲的比强度和比刚度,同时增加结构的可靠性。由于制造工艺和材料性能的特点,夹层结构在服役的过程中芯／板结合界面容易出现粘结不牢现象,从而可能产生局部脱粘分层缺陷,导致整个结构的静载强度减小。此外,由于在夹层中铺设加筋,导致芯体结构的几何间断,从而造成局部应力传递不连续和应力集中问题,使得本来就很丰富的复合材料蜂窝夹层结构的失效模式变得更加复杂。因此,有必要深入研究加筋强化复合材料蜂窝夹层结构的破坏机理,为结构的优化设计提供建议。本文采用有限元数值分析方法,并结合考虑复合材料面板发生基体失效、纤维断裂以及纤维／基体剪切失效的渐进损伤分析方法,研究了加筋强化复合材料蜂窝夹层结构在面内压缩载荷下的失效行为,初步探讨了加筋强化对复合材料蜂窝夹层结构力学性能的影响,并讨论了部分结构参数对夹层结构的影响。同时,分别研究了贯通型、圆形以及筋／板三种脱粘缺陷形式对加筋强化复合材料蜂窝夹层结构的压缩失效行为和最终失效模式的影响,总结了此种新型加筋强化复合材料蜂窝夹层结构破坏模式的特点。本项研究得到国家973课题(2014CB046506)和工业装备结构分析国家重点实验室自主研究课题(S14207)的资助。
[Abstract]:Composite honeycomb sandwich structure is widely used in many industrial fields because of its high efficiency and light weight. In recent years, with the increasing demand for high-performance lightweight structures in the field of engineering applications, the development of new sandwich structures has been greatly promoted. Among them, the reinforced composite honeycomb sandwich structure obtained by laying reinforcement in the honeycomb core is a new type of structure, the purpose of which is to further improve the specific strength and specific stiffness of the axial and bending of the structure in a balanced manner. At the same time, the reliability of the structure is increased. Due to the characteristics of manufacturing technology and material performance, the bonding between core and plate interface is easy to appear in the process of service of sandwich structure, which may lead to local delamination defect and decrease the static load strength of the whole structure. In addition, the laying of reinforcement in the sandwich leads to the geometric discontinuity of the core structure, resulting in local stress transfer discontinuity and stress concentration problems. The failure mode of the composite honeycomb sandwich structure, which is already abundant, becomes more complicated. Therefore, it is necessary to deeply study the failure mechanism of reinforced composite honeycomb sandwich structure, and provide suggestions for the optimum design of the structure. In this paper, the finite element numerical analysis method is adopted and the progressive damage analysis method considering the matrix failure, fiber fracture and fiber / matrix shear failure of the composite panel is taken into account. The failure behavior of reinforced composite honeycomb sandwich structure under in-plane compression was studied, and the effect of reinforcement strengthening on the mechanical properties of composite honeycomb sandwich structure was discussed. The influence of some structural parameters on sandwich structure is also discussed. At the same time, the effects of three types of debonding defects, namely, through type, circle and bar / plate, on the compressive failure behavior and final failure mode of reinforced composite honeycomb sandwich structure are studied. The characteristics of this new reinforced composite honeycomb sandwich structure are summarized. This research is supported by the National 973 Project (2014CB046506) and the National key Laboratory for structural Analysis of Industrial equipment (S14207).
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB33
本文编号：2472489
[Abstract]:Composite honeycomb sandwich structure is widely used in many industrial fields because of its high efficiency and light weight. In recent years, with the increasing demand for high-performance lightweight structures in the field of engineering applications, the development of new sandwich structures has been greatly promoted. Among them, the reinforced composite honeycomb sandwich structure obtained by laying reinforcement in the honeycomb core is a new type of structure, the purpose of which is to further improve the specific strength and specific stiffness of the axial and bending of the structure in a balanced manner. At the same time, the reliability of the structure is increased. Due to the characteristics of manufacturing technology and material performance, the bonding between core and plate interface is easy to appear in the process of service of sandwich structure, which may lead to local delamination defect and decrease the static load strength of the whole structure. In addition, the laying of reinforcement in the sandwich leads to the geometric discontinuity of the core structure, resulting in local stress transfer discontinuity and stress concentration problems. The failure mode of the composite honeycomb sandwich structure, which is already abundant, becomes more complicated. Therefore, it is necessary to deeply study the failure mechanism of reinforced composite honeycomb sandwich structure, and provide suggestions for the optimum design of the structure. In this paper, the finite element numerical analysis method is adopted and the progressive damage analysis method considering the matrix failure, fiber fracture and fiber / matrix shear failure of the composite panel is taken into account. The failure behavior of reinforced composite honeycomb sandwich structure under in-plane compression was studied, and the effect of reinforcement strengthening on the mechanical properties of composite honeycomb sandwich structure was discussed. The influence of some structural parameters on sandwich structure is also discussed. At the same time, the effects of three types of debonding defects, namely, through type, circle and bar / plate, on the compressive failure behavior and final failure mode of reinforced composite honeycomb sandwich structure are studied. The characteristics of this new reinforced composite honeycomb sandwich structure are summarized. This research is supported by the National 973 Project (2014CB046506) and the National key Laboratory for structural Analysis of Industrial equipment (S14207).
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB33
【参考文献】
相关硕士学位论文 前1条
1 赵金森;铝蜂窝夹层板的力学性能等效模型研究[D];南京航空航天大学;2006年
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