金属材料的强度与应力-应变关系的球压入测试方法

张志杰; 蔡力勋; 陈辉; 包陈; 刘晓坤

doi:10.6052/0459-1879-18-200

金属材料的强度与应力-应变关系的球压入测试方法

doi: 10.6052/0459-1879-18-200

西南交通大学力学与工程学院,应用力学与结构安全四川省重点实验室,成都 610031

基金项目: 1) 国家自然科学基金资助项目(11872320).

详细信息

作者简介:
作者简介: 2) 张志杰,硕士研究生,主要研究方向：材料测试理论和技术研究.E-mail：13688441351@163.com; 3) 蔡力勋,教授,主要研究方向：疲劳与断裂力学、材料测试理论与技术研究. E-mail：lix_cai@263.net; 4) 陈辉,博士研究生,主要研究方向：材料测试理论与技术研究.E-mail：chen_hui5352@163.com

中图分类号: O341;
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出版历程
- 刊出日期: 2019-01-18

SPHERICAL INDENTATION METHOD TO DETERMINE STRESS-STRAIN RELATIONS AND TENSILE STRENGTH OF METALLIC MATERIALS

Zhang Zhijie^{2)
,},
Cai Lixun^{3)
,},
Chen Hui^{4)
,},
Bao Chen,
Liu Xiaokun

Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province, School of Mechanics and Engineering, Southwest Jiaotong University,Chengdu 610031, China

摘要

摘要: 压入法获取材料单轴应力-应变关系和抗拉强度对服役结构完整性评价有重要的基础意义.假定材料均匀连续、各向同性、应力应变关系符合Hollomon律,基于能量等效假定,即代表性体积单元(representativevolume element, RVE)的vonMises等效和有效变形域内能量中值等效假定,本文提出了关联材料载荷、深度、球压头直径和Hollomon律的四参数半解析球压入(semi-analyticalspherical indentation,SSI)模型.通过球压入载荷-深度试验关系获得材料的应力-应变关系和抗拉强度.考虑压入过程中的损伤效应,针对金属材料提出了用于球压入测试的材料弹性模量修正模型.对11种延性金属材料完成了球压入试验,采用本文提出的球压入试验方法测到的弹性模量、应力-应变关系和抗拉强度与单轴拉伸试验结果吻合良好.
- 应力-应变关系 /
- 抗拉强度 /
- 能量等效 /
- 代表性体积单元 /
- Hollomon律 /
- 球压入试验 /
- 半解析球压入
Abstract: It is significant to obtain the uniaxial stress-strain relations and tensile strength of materials by indentation method for evaluating the integrity of structures in service. Based on energy equivalent assumptions, i.e., the Von Mises equivalence about a RVE (representative volume element) and the median energy equivalence in the effective deformation region, a semi-analytical spherical indentation(SSI) model is proposed to describe the relation among indented load, depth, the diameter of spherical indenter and Hollomon-law parameters if indented materials are uniform, continuous, isotropic and power-law hardening. The stress-strain relations and tensile strengths of the materials were obtained by the tested load-depth curves under spherical indenter loading. Considering the damage effect in the indentation process, a correction model for determining elastic modulus of the metallic materials due to the spherical indentation tests is proposed . For eleven kinds of tested ductile metallic materials with spherical indentation, the Young's modulus, stress-strain relations and tensile strength predicted by SSI model are in good agreement with the uniaxial tensile results.
- stress-strain relations /
- tensile strength /
- energy equivalence /
- RVE /
- Hollomon law /
- spherical indentation /
- SSI

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参考文献(1)

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