自动球压痕技术测定钢材力学性能的数值模拟 - 图文

题目：自动球压痕技术测定钢材力学性能的数值模拟

本 科 毕 业 论 文 学生姓名：韦洋 学 号：11032420

专业班级：过程装备与控制工程11-4班 指导教师：徐 书 根

2015年06月20日

中国石油大学（华东）本科毕业论文

自动球压痕技术测定材料力学性能的数值模拟

摘 要

随着科学技术和社会经济的持续发展，人们越来越重视工业生产中的安全问题，因此对在服役设备的检验以及寿命评估尤为重要。球形压痕技术能很好地解决常规性试验的破坏性取样问题。本文基于ABAQUS有限元软件，对自动球压痕试验测定材料力学进行了数值模拟，研究加载过程中试样的应力及变形规律。结果表明在加载过程中，压头附近有明显的应力集中，在卸载过程中，弹性变形进行了恢复，并且在试验结束后，被测材料表面有较多的材料堆积。其次还研究了本构模型与材料力学性能的关联性，由载荷-位移曲线关联得到了被测材料的真应力-真塑性应变曲线、屈服强度和极限拉伸强度。在本文最后，把数值模拟结果和常规性试验比对研究，结果显示自动球压痕试验的数值模拟能够有效的测定材料力学性能。

关键词：压痕试验；数值模拟；材料力学性能

中国石油大学（华东）本科毕业论文

The Numerical Simulation of Automatic Ball Indentation Technique to Measure Mechanical

Properties of Meterials

Abstract

With the development of science,technology and socio-economic,people pay more and more attention to the safety problems in industrial production,so the testing and life assessment of service equipment is particularly importment.The conwentional testing methods of mechanical properties are destructive sampling tests,automated ball indentation test can solve this problem[1]. Based on the ABAQUS finite element software,The numerical simulation of automatic ball indentation test is used to measure mechanical properties of meterials and study on the stress and deformation of specimen in the load process.Result show that there is stress concentrated near the head during the loading process and elastic deformation is recovered during the unloading process.After the test ,there is a lot of material accumulation on the surface.The relevance between the constitutive model and mechanical properties is also researched.The stress-strain curve ,yield strength and tensile strength is obtained bye the load-displacement curve. Finally,the results were compared with those from tensile test,it shows good agreement between ball indentation test and tensile test.

Keywords：Automated Ball Indentation Test;Numerical Simulation;Mechnical

properties

中国石油大学（华东）本科毕业论文

目 录

第1章 引言................................................................................................................ 1

1.1 选题背景......................................................................................................... 1 1.2 研究现状及进展............................................................................................. 2

1.2.1 材料性能常规性试验方法.................................................................. 2 1.2.2 自动球压痕技术的发展与现状.......................................................... 2 1.3 研究内容......................................................................................................... 3 第2章 自动球压痕技术原理.................................................................................... 5

2.1 真应力-真塑性应变的关联 ........................................................................... 5 2.2 屈服强度与工程极限拉伸强度的关联......................................................... 7

2.2.1 测定屈服强度ζy ................................................................................ 7 2.2.2 测定工程极限拉伸强度ζb ................................................................ 9 2.3 本章小结......................................................................................................... 9 第3章 自动球压痕测试的数值模拟...................................................................... 10

3.1 几何模型....................................................................................................... 10 3.2 材料属性....................................................................................................... 11 3.3 边界条件和初始条件................................................................................... 16 3.4 网格划分....................................................................................................... 16 3.5 本章小结....................................................................................................... 18 第4章 自动球压痕试验数值模拟与常规性试验比对研究.................................. 19

4.1 自动球压痕试验模拟结果分析................................................................... 19

4.1.1 载荷-位移曲线 .................................................................................. 19

中国石油大学（华东）本科毕业论文

4.1.2 真应力-真塑性应变曲线 .................................................................. 23 4.1.3 屈服强度ζy ...................................................................................... 26 4.1.4 极限拉伸强度ζb .............................................................................. 28 4.2 数值模拟结果和常规性试验结果比对研究............................................... 29

4.2.1 常规性试验过程................................................................................ 30 4.2.2 数值模拟结果和常规性试验结果比对研究.................................... 31 4.3 本章小结....................................................................................................... 33 第5章 结论.............................................................................................................. 35 致 谢.......................................................................................................................... 36 参考文献...................................................................................................................... 37

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