复合材料仿生高阶齿接结构承载特性及其影响因素

Loading property and its influence factor of composite bionic high-hierarchy suture joint structure

受自然骨缝连接结构的启发,基于图形分形原理,建立了不同阶次的复合材料仿生齿接结构模型。借助商用有限元软件ABAQUS,研究了齿接结构的界面损伤扩展规律与结构承载机制,分析了高阶齿接结构的结构互锁特性、齿数与齿型等因素对结构承载能力的影响。结果表明:高阶齿接结构的结构互锁特性极大地提高了结构承载能力并改变了结构损伤机制,适当增加单位宽度上的接齿数量与改变接齿局部特性可以降低应力集中,改善齿接结构力学性能。研究成果解释了自然骨缝连接结构在进化过程中所体现的力学原理,也为新型工程连接结构的发展开拓了新视野。

Inspired by the suture joint structure in nature,models of composite bionic suture joint structure with different orders of hierarchies were investigated based on the principle of graphic fractal.The law of interfacial damage extension and structural loading mechanism of joint structure were studied using commercial finite element software ABAQUS.The influence of structural interlocking feature,number of teeth and shape of teeth on the structural loading capability of the high-hierarchy suture joint structure was analyzed.The results show that the structural interlocking feature of the high-hierarchy suture joint structure improves structural loading capability significantly and changes the structure damage mechanism.Increasing the number of joint teeth on the unit width properly and changing local feature of joint teeth can reduce stress concentration and improve mechanical property of suture joint structure.The research explains the mechanical principle embodied in the process of evolution for the suture joint structure in nature,and provides new insights for the development of new engineering joint structure.