目的 为探究轻质随机纤维网状结构的宏观力学行为与其特有的网状微结构变形的内在机理,本文利用宏、细观力学分析方法,系统地研究酚醛浸渍碳纤维网状材料的力学行为。方法 通过轻质随机纤维网状材料单轴压缩、循环压缩力学实验,研究该类材料面内方向与面外方向力学行为的各向异性。结果 研究表明,该类材料面内方向的刚度、强度优于材料面外方向性能。进一步,采用原位观测方法表征了材料宏观力学性能及其典型失效模式。结论 揭示了微结构中纤维段弯曲、屈曲、纤维间接触滑移等典型变形机理和随机纤维网状结构宏观失效型内的内在关联机制,阐明了轻质随机纤维网状结构宏观各向异性的内在机理。该类材料有望在隔热、缓冲功能包装中应用。
Abstract
The work aims to explore the macroscopic mechanical properties of fibrous network materials and the intrisinc mechanism of their unique network microstructure deformation and systematically investigate the mechanical behavior of phenolic-impregnated carbon fibrous network materials by macroscopic and mesoscopic mechanical analysis. The anisotropic mechanical behaviors of the in-plane and out-of-plane directions of fibrous network materials were studied through uniaxial compression and cyclic compression mechanical experiments. Research showed that the stiffness and strength of the materials in the in-plane direction were superior to those in the out-of-plane direction. Further, in situ observation methods were used to characterize the macroscopic mechanical properties and typical failure modes. The work reveals the intrinsic correlation mechanism between typical deformation mechanisms such as fiber segment bending, buckling, and inter-fiber contact sliding in microstructures and the macroscopic failure types of fibrous network structures, and clarifies the intrinsic mechanism of macroscopic anisotropy in fibrous network structures. These materials are expected to be applied in heat insulation and cushioning functional packaging.
关键词
轻质随机纤维网状结构 /
力学性能 /
损伤演化
Key words
fibrous network structures /
mechanical properties /
damage evolution
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基金
国家自然科学基金青年项目（12102225）
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