纤维增强复合材料螺栓连接结构参数化有限元建模方法

Parametric finite element modeling method for fiber reinforced composite bolted structures

有限元建模方法是纤维增强复合材料螺栓连接结构强度分析的有效手段,为提高有限元建模效率,基于ABAQUS分析平台,对纤维增强复合材料螺栓连接结构参数化有限元建模方法进行了研究。根据纤维增强复合材料螺栓连接结构特征和强度分析的需求,采用GUI插件开发了专用的GUI图形参数输入界面,采用Python语言编写了连接结构有限元建模内核脚本程序,采用Fortran语言编写了损伤失效判定准则和刚度退化方法的用户子程序,搭建了纤维增强复合材料螺栓连接结构参数化有限元建模与强度分析平台。以碳/玻混杂复合材料三钉连接结构和T800碳纤维复合材料十钉连接结构为算例,模拟分析了连接结构的破坏载荷和破坏模式,并与试验结果进行了比较,破坏载荷误差在3%左右,破坏模式一致。研究结果表明,该参数化有限元建模与分析平台可实现各类纤维增强复合材料螺栓连接结构的快速自动建模,分析结果准确可靠,为纤维增强复合材料螺栓连接结构快速强度分析和工程优化设计提供了有效途径。

Finite element is an effective method for the strength analysis of bolted structure of fiber reinforced composites,in order to improve its efficiency of finite element modeling,the finite element parametric modeling method for fiber reinforced composite bolted structureswas studied based on ABAQUS analysis platform.According to the characteristic of bolted structure and the requirements of strength analysis of fiber reinforced composites bolted structure,the special GUI graphical parameter input interfaceswere developed by GUI plug-in,a kernel script program for finite element modeling of bolted structure was developed with Python,and a user damage subroutine for failure criterion and stiffness degradation was written in Fortran.A parametric finite element modeling and strength analysis platform for the bolted structure of fiber reinforced composites was established.Taking the three-nail bolted structure of carbon/glass hybrid composite and the ten-nail bolted structure of T800 carbon fiber composite as examples,the failure load and failure mode of the bolted structure were simulated and analyzed.Comparing with the experimental test results,the failure load error is about 3%,and the failure mode is same as experimental phenomenon.The research results show that the parametric finite element modeling and strength analysis platform can realize automatic modeling rapidly of various bolted structure of fiber reinforced composites with accurate and reliable analysis results,which provides an effective way for rapid strength analysis and engineering optimization design of fiber reinforced composites bolted structure.