碳纤维层合板胶接性能研究

发布时间：2018-04-28 13:22

本文选题：车身轻量化 + 胶接　；参考：《中北大学》2015年硕士论文

【摘要】：由于先进复合材料具有高比强度和刚度、优异的抗疲劳力学性能并且可以对材料进行自主铺层的优点，因此先进复合材料是改善产品性能的关键材料，广泛的应用在了汽车、飞机等领域。如今，整体化设计与制造是汽车设计中可以有效提高车身结构效率的重要手段之一。但是，在汽车复合材料结构设计中，部件间的连接设计仍然是结构设计中必须考虑的问题。胶接技术是汽车轻量化未来发展中的关键性技术之一，在异质连接性能、密封性、抗疲劳性能等方面都要比传统的机械连接性能更加优良。由此可知，研究胶接力学的性能，改进胶接接头胶接强度的预测方法及理论，可以为车身连接结构及优化过程中有效应用该技术提供重要的指导作用，并且可以提高国内汽车的轻量化发展及自主研发能力，该技术的研究使用具有非常深远的战略意义。以此为背景，本文针对影响胶接接头的因素本文开展了对T800/924C复合材料层合板胶接单搭接模型采用力学解析、有限元模拟相结合的方法，，对单搭接模型的胶接性能进行了研究。主要工作内容概括如下：首先，对碳纤维层合板单搭接接头进行力学建模，提出相关的数学函数，通过被粘层合板的屈曲载荷估算接头可以承受的最大拉伸力。其次，在横梁弯曲理论的基础上，分析加载上述最大拉伸力胶接接头处胶层正应力和剪应力的分布情况，论证通过层合板的屈曲载荷估算胶接接头可承受的最大拉伸力是合理的。再次，通过ABAQUS有限元软件分析胶接接头不同胶层厚度时的应力分布情况，对前文的力学研究进行对比和验证。最后，对今后应用于汽车上的碳纤维复合材料的胶接性能研究工作进行了展望。本文通过胶接接头的应力解析模型和有限元模拟分析的方法全面的分析了胶接接头的应力分布状态、接头强度性能以及其他可能影响胶接连接的因素。研究证明了利用复合材料碳纤维层合板的初始屈曲载荷来估算胶接接头可承载最大拉伸力的方法是完全可行的，本文的分析结果为汽车轻量化中应用该技术提供了有力的指导作用。
[Abstract]:Because advanced composites have the advantages of high specific strength and stiffness, excellent anti-fatigue mechanical properties and the ability to layer the materials independently, advanced composite materials are the key materials to improve the properties of the products and are widely used in automobiles. Aircraft, etc. Nowadays, integrated design and manufacture is one of the most important methods to improve the efficiency of automobile body structure. However, in automotive composite structure design, the design of joint between components is still a problem to be considered in structural design. Adhesive bonding technology is one of the key technologies in the future development of automotive lightweight. The performance of heterogeneity connection sealing and fatigue resistance is better than the traditional mechanical connection performance. It can be seen that studying the mechanical properties of adhesive joints and improving the prediction method and theory of bonding strength can provide important guidance for the effective application of this technology in the process of body structure and optimization. And it can improve the lightweight development and independent R & D ability of domestic automobile. The research and application of this technology has a very profound strategic significance. In this paper, the mechanical analysis and finite element simulation are used to study the adhesive properties of T800 / 924C composite laminated laminates by means of mechanical analysis and finite element simulation. The main work is summarized as follows: Firstly, the mechanical model of carbon fiber laminated single lap joint is established, and the related mathematical function is presented. The maximum tensile force of the joint can be estimated by the buckling load of the bonded laminated plate. Secondly, on the basis of the theory of beam bending, the distribution of normal stress and shear stress of the adhesive layer at the adhesive joint with the maximum tensile force is analyzed. It is proved that it is reasonable to estimate the maximum tensile force of adhesive joint by buckling load of laminated plate. Thirdly, the stress distribution of adhesive joints with different thickness is analyzed by ABAQUS finite element software, and the previous mechanical research is compared and verified. Finally, the future research work on adhesive properties of carbon fiber composites used in automobile is prospected. In this paper, the stress distribution state, strength performance and other factors which may affect the bonding joint are analyzed comprehensively by means of the stress analytical model and finite element simulation analysis of the adhesive joint. It is proved that it is feasible to use the initial buckling load of the composite carbon fiber laminated plate to estimate the maximum tensile force of the adhesive joint. The results of this paper provide a powerful guidance for the application of this technology in automotive lightweight.
【学位授予单位】：中北大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB332

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