纤维增强热塑性点阵复合材料夹芯结构制备及力学性能表征与失效机制研究

Light lattice materials and structures have been widely used in various engineering areas, such as aeronautical engineering, aerospace engineering, motive, marine, rail transportation etc, due to its excellent mechanical properties and multifunctional characteristics. The proposal will propose reasonable technology programs for "high volume manufacturing materials" with recycling potential. The microstructure deformation of the lattice cores is taken into account in the compression of the lattice core to systematically study the mechanical characrization and failure mechanism of fiber reinforced thermoplastic composite sandwich structures under static and dynamic loading. Based on the microscopic mechanism, a static and dynamic elastoplastic constitutive model of fiber reinforced thermoplastic composite sandwich structures under static and dynamic loading will be proposed. Various types of failure mechanisms will be identified to establish the multi-mode failure theory by means of macroscopic and microscopic measurement methods. Meanwhile, in this project we will develop the mechanical properties characterization method of fiber reinforced thermoplastic composite sandwich structures under static and dynamic loading. A systematic mechanical performance evaluation system of sandwich structures will be established, which will effectively promote the research level of fiber reinforced thermoplastic composite sandwich structures.

轻质点阵材料结构优异的力学性能和多功能特性，使其在航天航空、航海、汽车和轨道交通等众多工业领域得到广泛应用。该申请项目拟针对热塑性点阵复合材料夹芯结构，提出低成本、批量化制备工艺，考虑芯体压缩时的细观变形特点，对其在静动态载荷作用下的力学行为进行系统研究，建立结构基于细观机制的静态和动态弹塑性本构模型，通过宏观和微观的测试手段识别各类失效机理，并建立相应的细观多模式破坏理论分析模型，绘制复杂应力条件下的破坏模式图，同时，本项目将发展热塑性点阵复合材料夹芯结构在静动态载荷下力学性能的实验表征方法，系统地建立其力学性能评价体系，将有效地推动国内热塑性点阵复合材料夹芯结构研究水平的提高。

轻质点阵材料结构优异的力学性能和多功能特性，使其在航天航空、航海、汽车和轨道交通等众多工业领域得到广泛应用。项目结合低成本、批量化、易回收环境友好型复合材料的发展趋势，开展了连续玻璃纤维增强热塑性复合材料夹芯曲面结构及多层级结构的设计制备技术研究。考虑典型失效模式和刚度退化准则开发ABAQUS VUMAT用户子程序，研究了夹芯结构在的力学响应。考虑面板/芯层屈曲和破坏、面芯界面失效，理论推导了纹夹芯结构的强度，绘制出失效模式图，成功预测了结构的失效模式。发展了采用新型加热单元的电阻焊连接工艺方法，系统建立了电阻焊连接工艺评价方法以及工艺参数优化方法，为电阻焊连接在夹芯结构面芯连接中应用提供实验依据和技术支撑。以第一作者或通讯作者发表论文10篇，其中SCI论文9篇，ESI高被引论文1篇。以第一发明人授权国家发明专利2项，公开发明专利2项。入选中国科协青年人才托举工程、重庆英才计划-青年拔尖人才、重庆大学科研后备拔尖人才（B类）和获得重庆大学优秀青年教师奖。获得首届国际航空科学青年学者学术会议611 Prize for Best Paper，重庆市科协“自然科学优秀论文”2篇。指导毕业博士1名、硕士2名，在读博士1名、硕士5名。受邀作国际会议邀请报告2次、口头报告12人次，国内学术会议邀请报告4人次、口头报告21人次。