铆钉数量及间距对自冲铆接头性能的影响
张先炼何晓聪程强赵伦
（昆明理工大学机电工程学院，昆明650500）
文摘为研究铆钉数量及钉间距对自冲铆接头性能的影响，首先采用数值模拟和试验的方式优化了钾接参数，制备了三组不同形式接头；基于拉伸-剪切实验研究了各组接头的静力学性能及其失效形式；并运用MATLAB2014b用户自定义开发平台精确计算出各组接头的能量吸收值。结果表明：数值模拟结果与实验具有良好的一致性；单铆钉接头失效形式为铆钉从下板完全拉出，双铆钉接头失效形式为板材断裂失效；双铆钉接头性能明显优于单钾钉接头，而铆钉间距对接头静失效载荷和能量吸收性能的影响较小。
关键词自冲铆，数值模拟，失效形式，静失效载荷，能量吸收
中图分类号：TH131.1
D0I;10.3969/j.issn.10072330.2016.02.012
InfluenceofNumberandDistanceofRivetson thePerformanceofSelf-PiercingRivetedJoints
ZHANGXianlian
HEXiaocong
CHENG Qiang
ZHAOLun
(Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming650500)
Abstract In order to study the influence of the number and distance of rivets on the performance of self-piercing riveted joints, the numerical simulation and experiments were conducted to optimize the parameters of self-piercing riveting (SPR), and three different types of joints were made. The static performance and failure modes of different joints were studied based on the tensile-shear tests. And the energy absorption value was calculated accurately though the user defined development which is based on MATLAB R2014b platform. The results show that the numerical sim-ulation result was highly identical to the experimental result. The single-riveted joints failed by the rivet being pulled out from the lower sheet, and the double-riveted joints failed due to the sheet fracture. The performance of double-riv-eted joints was obviously superior to that of single-riveted joints. However, the distance of rivets had little influence on the static failure strength and energy absorption performance.
a
0引言
随着人们环境意识的不断增强，越来越多的轻量化材料被用在汽车工业中以减少能源损耗和降低二氧化碳排放量。本研究以铝锂合金为载体，其低密度、高弹性模量、高比强度及比刚度，采用铝锂合金替代传统铝合金结构材料，可使构件质量减轻15%，刚度提高15%~20%[]。然而，传统的连接方式很难甚至不能对这些材料进行连接；近年来快速发展的自冲铆技术[2-3]可以实现对轻量化材料的有效连接。
针对自冲铆接技术，国内外学者已经进行了大量的研究。邢保英等[4]研究了铆钉分布形式对自冲铆接头性能的影响，得出纵向分布铆钉接头比横向分布钉接头的缓冲吸震性能更好，当疲劳绒荷水平较高时，纵向分布铆钉形式的接头可提高疲劳寿命，而当疲劳载荷水平较低时，横向分布铆钉形式接头可提高疲劳寿命。HOANG等3}通过LS-DYNA有限元分析软件模拟了自冲铆接过程，并研究了不同的网格划分尺寸和摩擦因数对铆接过程的影响。HE等6]对铝
收稿日期：201508-14
基金项目：国家自然科学基金资助项目（51565023,51565022）；国家科技重大专项项目(2012ZX04012-031)
作者简介：张先炼，1992年出生，硕士研究生，主要研究方向为薄板材料连接新技术。E-mail;xlian4gd@163.com 通讯作者：何晓聪，教授，博士生导师，从事薄板材料连接新技术研究。E-mail；xiaooong_he@126.oom
宇航材料工艺万方数据
http://www.yhelgy.com
2016年第2期
— 53