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摘要:
针对复合材料仿骨缝齿接结构模型表述复杂性问题，基于MATLAB与Python语言对有限元分析软件ABAQUS进行二次开发，提出了复合材料齿接结构的参数化构建方法。并以此为基础，初步研究了齿顶角、基线类型、层级与结构力学性能之间的关系。研究结果表明，在拉伸载荷作用下，具有小齿顶角度、复杂基线特性、高层级特性的齿接结构可以表现出更好的力学性能。通过本文工作，实现了齿接结构的参数化构建，初步揭示了齿接结构承载能力、损伤机理和几何形貌之间的关系。
Abstract:In this paper, we developed a parametric modeling framework for composite bionic suture joint structures through MATLAB and ABAQUS secondary development based on Python language. It shows the capability in describing the complicated suture joint geometry with different types of hierarchy and automatic generation of finite element mesh for mechanical modeling. Furthermore, interactions between geometric parameters (tooth angle, baseline type, and hierarchy) and structure performance are analyzed. The numerical results show that the bionic suture joint structure has better structural damage tolerance with the presence of a lower tooth angle, a sin curve baseline and a higher hierarchy. Through this work, parametric modeling of composite suture joint structure is realized, and the interaction among mechanical strength, damage mechanism and suture geometries is investigated, which provides meaningful guidelines for the design and optimization of novel high performance composite joint structures.
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图 5 齿顶角不同的骨缝齿接结构载荷-位移曲线、等效应力-位移曲线
Figure 5. Curves of load-displacement and equivalent stress-displacement for suture joint structure with different tooth angles
图 6 不同基线类型骨缝齿接结构载荷-位移曲线、等效应力-位移曲线
Figure 6. Curves of load-displacement and equivalent stress-displacement for suture joint structure with different baseline types
图 7 不同基线类型骨缝齿接结构内聚力单元损伤过程
Figure 7. Damage evolution of cohesive element for suture joint structure with different baseline types
图 8 不同层级骨缝齿接结构应力分布、载荷-位移曲线
Figure 8. Stress distribution and load-displacement curves for suture joint structure with different hierarchies
表 1 骨缝齿接结构关键参数
Table 1. Key parameters of suture joint structure
齿数 齿顶角/(°) 基线类型 层级 9 30 直线 1 9 45 直线 1 9 60 直线 1 15 45 直线 1 15 45 正弦曲线 1 5 45 直线 2 5 45 直线 3 
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表 2 骨缝齿接结构材料参数
Table 2. Material parameters of suture joint structure
材料参数 弹性模量/MPa 泊松比 数值 116 000 0.3
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MPa 材料参数 Knn Kss Ktt 数值 491 000 264 500 264 500 注：Knn-法向刚度；Kss-1方向刚度；Ktt-2方向刚度。
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