铝合金搭接接头焊接工艺设计课案.docx

毕业设计（论文）题目铝合金搭接接头焊接工艺设计专业班级学生学号指导教师重庆交通大学年目录摘要IABASTRACTII前言3第1章铝合金焊接必备知识51.1 铝合金性能51.2 铝合金分类51.3 铝合金的焊接特点6第2章有限元介绍72.1 有限元法概述72.2 有限元的发展82.3 有限元在焊接中的应用及发展82.4 有限元软件ABAQUS介绍92.4.1 ABAQUS简介92.4.2 ABAQUS基本模块及操作方法10第3章焊接变形有限元分析理论113.1 焊接热过程分析理论113.1.1 热量传递三种基本方式113.1.2 焊接热过程特点123.1.3 热传导分析中的非线性133.1.4 非线性热传导有限元分析133.2 焊接残余应力和变形分析理论143.2.1 基本假设143.2.2 平衡方程153.3 ABAQUS热应力分析问题153.3.1 ABAQUS中的几种热边界条件和热载荷153.3.2 ABAQUS热应力分析类型16第4章程序设计174.1 材料及焊件尺寸确定174.2 建立几何模型174.3 材料定义及截面属性的分配184.4 装配194.5 定义分析步194.6 建立接触204.7 创建载荷及预定义场214.8 划分网格224.9 编写子程序234.10 创建作业244.11 提交计算25第5章计算结果分析265.1 温度场计算结果及分析265.2 应力应变场计算结果分析325.2.1 应力场计算结果及分析325.2.2 变形结果及分析34第6章焊接方案37致谢38参考文献39摘要焊接，作为一种重要的现代化加工手段，得到的焊件密封性好，结构刚度大，且质量相对较轻，可有效减轻产品结构自重。但是，在焊接过程中产生的残余应力和变形对焊件的影响非常巨大。本课题基于ABAQUS有限元软件，同时考虑到材料非线性、几何非线性和边界条件非线性，采用热-弹-塑性有限元法对焊接过程进行数值模拟。以4mm厚的6061-T6铝合金搭接接头为例，采用完全耦合热应力分析方法，同时进行温度场和应力场的求解，得到焊件的温度、应力、应变分布规律，并对结果进行分析，并根据最终结果得出工艺设计方案。关键字：焊接工艺，搭接接头，残余应力，有限元，完全耦合，热应力分析ABASTRACTAs an important means of modern processing, Welding is used by various walks of life. With good sealing, good structural stiffness, and light weight, Weldment can effectively reduce the weight of the product, and is good for energy conservation. But during the process of welding, residual stress and deformation of the weldment is very common, which have a big impact on weldment. Based on the finite element software ABAQUS, a thermal-elastic-plastic finite element method was applied in consider of material non-linearity, geometric non-linearity and boundary conditions non-linearity, to simulate welding process. Focus on 4mm thick 6061-T6 aluminum alloy lap joint, Fully coupling method was adopted. we made heat transfer analysis and thermal stress analysis at the same time, so we obtained temperature, stress, strain distribution, which is exactly what we need to analyse.After that,we can get the welding process.Keywords：Welding process, lap joint，Residual stress, Finite element method, Fully coupling, Thermal stress analysis前言焊接，是指以