摘要
木材中起骨架作用的纤维素是以不同螺旋结构的微纤丝形式存在于细胞壁中。本文通过将3D打印技术与仿真模拟相结合,研究木材细胞壁的纤维螺旋增强结构。使用微晶纤维素(MCC)/聚乳酸(PLA)复合材料,在对MCC/PLA复合材料各项性能进行测试的基础上,借助3D打印技术构建木材细胞壁螺旋结构,通过改变纤维取向和纤维孔状结构编程合成结构的力学功能。有限元仿真则用于强调纤维在刚性单元之间的载荷传递机制中的关键作用。结果表明:通过编程纤维的取向和结构可以宏观调控结构的性能,其中纤维的交叉结构作为一种优化设计可以用于提高结构成型制品的力学性能。这些结构可以被组装成更大的系统,用于构建具有优化特定功能的模块化复合材料;在异质结构设计和新型复合材料制造领域中均具有潜在的应用价值。
Cellulose,which plays the role of skeleton in wood,exists in the cell wall in the form of microfibrils with different helical structures.In this paper,the fiber spiral reinforced structure of wood cell wall was studied by combining 3D printing technology with simulation.Using microcrystalline cellulose(MCC)/polylactic acid(PLA)composites,based on the testing of the properties of MCC/PLA composites,the spiral structure of wood cell wall was constructed with the help of 3D printing technology,and the mechanical function of the structure was programmed by changing the fiber orientation and fiber pore structure.Finite element simulation was used to emphasize the key role of fiber in the load transfer mechanism between rigid elements.The results show that the properties of the structure can be controlled by programming the orientation and structure of the fiber,and the cross structure of the fiber can be used to improve the mechanical properties of the structural molded products as an optimal design.These structures can be assembled into larger systems for building modular composites with optimized specific functions.It has potential application value in the field of hetero structure design and new composite material manufacturing.
作者
秦施埼
任泽春
王辰希
寇允
刘昭言
许民
QIN Shiqi;REN Zechun;WANG Chenxi;KOU Yun;LIU Zhaoyan;XU Min(Key Laboratory of Bio-based Material Science and Technology of Ministry of Education,Northeast Forestry University,Harbin 150040,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2023年第2期1085-1095,共11页
Acta Materiae Compositae Sinica
基金
东北林业大学大学生国家级创新科研训练项目(201910225161)。
关键词
熔融沉积成型
纤维素
仿生设计
力学性能
有限元分析
fused deposition molding
cellulose
bionic design
mechanical properties
finite element
