【作者】 刘文英；

【导师】 刘玉红；

【作者基本信息】 天津大学 ， 机械制造及其自动化， 2012， 硕士

【摘要】 由于能源紧缺，使得汽车车身的轻量化成为汽车行业的一个重要发展趋势。汽车车身轻量化的主要途径便是采用铝、镁合金、复合材料等高性能轻量化材料。胶铆连接是解决这些轻量化材料连接的有效手段之一。而单面自冲铆-粘（SSPR-B）连接工艺是近几年由天津大学提出的一种全新的胶铆连接工艺，它有效解决了铆接对胶层的破坏，从而保证了胶铆连接的强度。本文在已有物理试验的基础上，开展剪切载荷作用下SSPR-B接头应力分布有限元分析，为SSPR-B连接工艺参数的合理确定提供理论参考。获得的研究成果如下：（1）基于ABAQUS有限元分析软件，建立了在剪切载荷作用下SSPR-B连接试样应力分析的有限元模型，并通过物理试验验证了所建有限元模型的正确性及方法的可行性。（2）分析了自冲铆接（SPR）工艺及单面自冲铆接（SSPR）工艺对胶粘连接性能的影响，通过对比分析表明，SSPR连接对胶层的破坏远小于SPR对胶层的破坏。（3）分析了不同搭接长度下，SSPR-B接头应力分布情况，结果表明，随着搭接长度的增加，接头强度有所提高，但达到一定长度后，对接头的强度影响就很微弱。（4）分析了铆钉的排列形式对SSPR-B接头应力的影响，结果表明，铆钉的排列形式对接头强度的影响很小，因此，实际应用中，可依具体工程方便来排列U形铆钉的铆接方向。（5）分析了胶瘤、胶材料的弹性模量、以及被连接板料的弹性模量对SSPR-B接头应力的影响。结果表明，胶瘤可以提高接头的承载能力；随着胶的弹性模量降低，胶层的应力峰值逐渐降低，胶层应力分布趋于均匀；随着板料的弹性模量的增大，胶层的应力峰值逐渐降低，胶层应力分布趋于均匀。更多还原

【Abstract】 Automobile lightweight body has become an important development trend ofmodern vehicles because of the energy shortage. It is a main way to lightweightvehicle body for using high performance lightweight materials, such as aluminum,magnesium alloy, composite materials, etc.. Rivet-bonding joining is one of theeffective means to solve these lightweight material connections. A new rivet-bondingjoining process—single-sided piercing rivet-bonding (SSPR-B) process, which wasproposed by Tianjin University in recent years, can guarantee the least damage of theadhesive bonding. On the basis of physics experiment, stress distributions of SSPR-Bjoints under the shear loading were studied by using finite element method.Achievements of this thesis provide a theoretical reference for the reasonabledetermining the process parameters of SSPR-B. Achievements are as follows:（1）The finite element analysis model, which was used for stress analysis ofSSPR-B under the shear loading has been established based on the ABAQUSsoftware. The physic experiments were carried out to validate the finite elementmodel.（2）The influences of self-piercing riveting (SPR) and SSPR on properties ofadhesive bonding were analyzed. Results show that damage of the adhesive bondingby SSPR is much less than that by SPR.（3）Effects of lap length on stress distribution of the SSPR-B joints werediscussed. Results show that the joint strength increases with increasing the lap length.But it has a weak effect on the joint performance when the lap length reaches a certainmagnitude.（4）Effects of riveting direction on stress distribution of the SSPR-B jointshave been studied. Result shows that the riveting direction on the strength of joint isvery small. Therefore, the riveting direction of U-shaped rivet can be arrangedaccording to specific engineering convenience in practical application.（5）Effects of spew fillet, elastic modulus of the adhesive material, as well asthe elastic modulus of the joined plates on stress distribution were analyzed. Resultsshow that spew fillet can improve the load bearing ability of the SSPR-B joints. The stress peak values of the bonding decrease with decreasing the elastic modulus ofadhesive, and the stress distribution in the adhesive layer tends to be uniform. Thestress peak values of the bonding decrease with increasing the elastic modulus of thejoined plates, and the stress distribution in the adhesive layer tends to be uniform.更多还原