摘 要:钢管的弯曲加工方法可大致分为冷弯和热弯两类,其中冷弯加工具有生产效率高、能耗低、生产成本低等特点因而具有广泛的工程应用背景。但是钢管经过冷弯加工后其金相组织和力学性能发生了较大的变化,随着弯曲程度的增加,材料力学性能的变化越趋大。通常而言,这种材料性能的改变对于构件的受力性能是很不利的,如果不考虑这些变化,就会使弯管构件在使用期间中存在不确定的潜在危险,进而成为结构失效和破坏的原因。因此本课题主要利用有限元计算方法对管材弯曲成形过程进行了模拟分析。研究Q235、304两种钢管,在不同规格,不同的弯曲半径条件下,弯曲成型过程中的变形规律、应力应变变化规律。并且对比分析两种钢种的异同点,最终确定产生该钢管缺陷的失效临界点,即最小弯曲半径。关键词: 弯管;有限元模拟;弯曲半径;失效8489
Simulation Analysis of Elbow Stability Abstract
Steel Pipe Structures (SPS) have been widely used in civil engineering. In comparison to the straight pipes are extensively employed in steel trusses and lattice shells, the curved steel pipes as the chord of trusses or skeleton of membrane structures being increasedly used. The cold-bending process of steel pipes possesses high productive efficiency and low energy and less production cost, it can be widely used in the structure field. However, the mechanical properties of cold-bended steel pipes are changed greatly. Generally, this change is not valuable to the member and related structures. If neglecting this variations, the steel pipes exists potential uncertainty. Even it makes the structure fail.This project mainly uses the finite element method on the simulation analysis of tube bending forming process. This paper study Q235, 304 of two kinds of steel tubes, with different specifications, bending radius under different conditions, deformation, bending and forming process of the stress and strain variation, and comparative analysis of two kinds of steel of the similarities and differences, Ultimately determine the critical point defects in steel pipe, the minimum bending radius.
Keywords:elbow; finite element simulation; bending radius; invalidation
目 录
1 文献综述 1
1.1 管材弯曲加工一般介绍 1
1.2 国内外研究现状 1
2 选题目的及意义 2
2.1 目的 2
2.2 意义 2
3 研究方案 3
3.1 研究方案 3
3.2 两种材质 3
3.2.1 Q235碳素结构钢 3
3.2.2 304奥氏体不锈钢 4
3.3 参数设置 4
4 DEFORM软件 5
4.1 前处理器 5
4.2 模拟处理器 5
4.3 后处理器 6
4.4 DEFORM软件操作流程 6
5 弯管的有限元建模 8
5.1 几何模型的建立 8
5.2 网格的建立 9
5.3 材料模型的建立 10
5.4 边界条件的处理 11
5.4.1 接触的建立 11
5.4.2 摩擦模型的选择 11
5.3.3 设置对象间关系 11
5.5 定义驱动条件 12
5.6 设置轧件体积补偿 13
5.7 设置模拟控制信息 13
5.8 生产数据库文件及分析求解 14
5.9 后处理 15
5.9.1 变形过程显示 15
5.9.2 查看状态变量 15
6 有限元模拟云图分析 16
6.1 弯曲半径对弯管的影响 16 有限元弯管稳定性的模拟分析+文献综述:http://www.751com.cn/cailiao/lunwen_6690.html