复合材料螺接修理结构参数化建模分析工具开发及验证

Development and validation of a parametrical modeling and analysis tool for bolted repair in composite structures

螺接修理在复合材料结构的临时性修理,尤其是战伤修理中应用较广泛。然而其修理设计过程较复杂,建模分析难度较大,难以满足工程快速定参的需要。本文针对含穿透损伤复合材料层合板的螺接修理问题,采用VB.NET结合p型有限元技术,开发了一套参数化的建模分析工具。分析工具通过界面读取修理结构的几何参数、螺栓布局、螺栓大小、载荷、材料属性等参数,自动创建有限元模型并进行求解。根据求解结果,分析工具可为用户提供修理结构的螺栓载荷、钉载比例、危险孔孔边应力等。另外,通过引入有限断裂力学,结合两级模型分析技术可预测得到修理结构的失效强度和失效位置。最后,采用典型算例对分析工具的有效性进行了验证。

Bolted repair is a preferable repair method in damaged composite structure,especially in battle damage repair.However,the repair design process is complex,and it is difficult to meet the need for rapid sizing.A parametrical modeling and analysis tool was developed for design of composite bolted repair with penetrating damage,using VB.NET combined with p-version finite element method.The tool allows the user to create the joint geometry through a menu-driven interface and then to generate a customized mesh.Boundary conditions,bolt pattern,bolt diameter,applied load and material properties could also be set.The model was solved automatically,and based on the analysis results,the load transfer ratio,bolt load and the stress around the critical hole are offered by the analysis tool.Finite fracture mechanics model is used to predict the failure load and failure mode of the repaired joints.A case study was shown to demonstrate the usefulness of the tool.