检索结果-南通市图书馆

Novel method for measuring surface residual stress using flat-ended cylindrical indentation

Chinese Journal of Aeronautics 2024年第8期37卷 486-495页

作者： Guangzhao HAN lixun cai Xiaokun LIU Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province School of Mechanics and Aerospace EngineeringSouthwest Jiaotong UniversityChengdu 610031China Zhengzhou Machinery Research Institute Transmission Technology Co. LtdZhengzhou 518115China

Instrumented indentation is a promising technique for estimating surface residual stresses and mechanical properties in engineering *** relative difference between the indentation loads for unstressed and stressed specimens was selected as the key parameter for measuring surface residual stresses in flat-ended cylindrical *** on the equivalent material method and finite element simulations,a dimensionless mapping model with six constants was established between the relative load difference,constitutive model parameters,and normalized residual stress.A novel method for measuring the surface residual stress and constitutive model parameters of metallic material through flat-ended cylindrical indentations was proposed using this model and a mechanical properties determination *** simulations were conducted using numerous elastoplastic materials with different residual stresses to verify the proposed model;good agreements were observed between the predicted residual stresses and those previously applied in finite element ***-ended cylindrical indentation tests were performed on four metallic materials using cruciform specimens subjected to various equibiaxial *** results exhibited good conformance between the stress–strain curves obtained using the proposed method and those from traditional tensile tests,and the absolute differences between the predicted residual stresses and applied stresses were within 40 MPa in most cases.

关键词： Instrumented indentation Residual stress Finite element simulation Equivalent material method Mechanical property

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

用于延性材料力学性能测定的圆柱平面-小冲杆试验新方法与应用

引用

机械工程学报 2024年第4期60卷 316-325页

作者：周甜蔡力勋韩光照西南交通大学应用力学与结构安全四川省重点实验室成都610031

针对均匀、各向同性、幂律硬化的金属材料圆片试样,以圆柱平面小冲杆对试样圆面中心法向施加压载荷,提出基于能量密度等效的、用于描述试样几何尺寸、材料本构关系参数、载荷和位移之间关系的圆柱平面-小冲杆试验(Flat small punch test... 详细信息

针对均匀、各向同性、幂律硬化的金属材料圆片试样,以圆柱平面小冲杆对试样圆面中心法向施加压载荷,提出基于能量密度等效的、用于描述试样几何尺寸、材料本构关系参数、载荷和位移之间关系的圆柱平面-小冲杆试验(Flat small punch test,F-SPT)弹塑性模型,并提出获取材料应力-应变曲线和力学性能指标的F-SPT新方法。通过有限元分析对不同弹性模量、屈服强度和硬化指数组合的48种预设材料进行新方法的数值验证,以及对10种金属材料完成F-SPT,结果表明,由新方法获得的应力-应变曲线与有限元分析预设曲线和传统单轴拉伸试验结果吻合良好,此外,由新试验方法获得的弹性模量、屈服强度和抗拉强度与单轴拉伸试验结果误差大部分低于7%。

关键词：小冲杆试验能量密度等效幂律硬化材料应力-应变关系力学性能

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

有限平面应变Ⅱ型裂纹尖端幂律塑性应力场全解

引用

中国科学：物理学、力学、天文学 2024年第4期54卷 146-157页

作者：王志强肖怀荣蔡力勋黄茂波西南交通大学力学与航空航天学院应用力学与结构安全四川省重点实验室成都610031

针对幂律材料、有限平面应变紧凑拉伸剪切(Compact Tension and Shear,CTS)试样,基于能量密度等效方法可得到CTS试样能量密度中值点的代表性体积单元(Representative Volume Element,RVE)的等效应力解析解,以该应力解作为特征应力因子,... 详细信息

针对幂律材料、有限平面应变紧凑拉伸剪切(Compact Tension and Shear,CTS)试样,基于能量密度等效方法可得到CTS试样能量密度中值点的代表性体积单元(Representative Volume Element,RVE)的等效应力解析解,以该应力解作为特征应力因子,采用表征CTS试样Ⅱ型裂纹尖端应力场的三角特殊函数,提出了描述有限平面应变幂律塑性Ⅱ型裂纹尖端应力场的半解析模型以及用于描述Ⅱ型裂纹尖端扇贝轮廓式等应力线的理论解.本文Ⅱ型裂纹裂尖场模型对平面应变CTS试样裂尖应力场的预测结果与有限元分析结果密切吻合,Ⅱ型裂纹裂尖幂律塑性应力场模型完善了弹塑性断裂力学,并对剪切型断裂安全评价有重要工程意义.

关键词：幂律塑性有限平面 Ⅱ型裂纹半解析模型应力场

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Residual stress indentation model based on material equivalence

引用

Chinese Journal of Aeronautics 2022年第8期35卷 304-313页

作者： Xiaokun LIU lixun cai Hui CHEN Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province School of Mechanics and EngineeringSouthwest Jiaotong UniversityChengdu 610031China School of Civil Engineering Changsha University of Science&TechnologyChangsha 410114China

A novel residual stress indentation model for conical indentation loading is proposed to describe the relationship between the residual stress,material constitutive parameters,load,and displacement for materials with a uniaxial constitutive relationship that obeys Hollomon’s power law(H-law).The novel model was established based on the principle that the equivalent material without residual stress corresponds to the original material with residual stress,conical indentation theoretical model based on energy density equivalence,and an assumed power-law relationship between the dimensionless residual stress and relative difference of the yield stresses of the equivalent material and original *** imaginary H-law materials with ten equibiaxial and ten uniaxial residual stresses were investigated by Finite Element Analysis(FEA).The residual stresses predicted by the novel model from the indentation load–displacement curves simulated for the imaginary materials are in close agreement with those applied by the ***,indentation tests for Cr12Mo V steel,45 steel,and 6061-T6511 aluminum alloy were carried out on their specimens without residual stress and their bending specimens with equibiaxial and uniaxial residual *** residual stresses predicted by the novel model according to the indentation load–displacement test curves are in good agreement with those applied by the tests.

关键词： Conical indentation Equivalent material Finite element analysis Residual stress Theoretical model

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Prediction of fatigue crack growth rate for smallsized CIET specimens based on low cycle fatigue properties

引用

Chinese Journal of Aeronautics 2018年第4期31卷 740-748页

作者： Chen BAO lixun cai Kaikai SHI Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province School of Mechanics and EngineeringSouthwest Jiaotong University

Based on experiments of low cycle fatigue for 5083-H112 aluminum alloy, two energybased predictive models have been introduced to predict the fatigue crack growth behaviors of traditional Compact Tension（CT） and small-sized C-shaped Inside Edge-notched Tension（CIET）specimens with different thicknesses and load ratios. Different values of the effective stress ratio U are employed in the theoretical fatigue crack growth models to correct the effect of crack *** indicate that the two predictive models show different capacities of predicting the fatigue crack growth behaviors of CIET and CT specimens with different thicknesses and load *** accuracy of predicted results of the two models is strongly affected by the method for determination of the effective stress ratio U. Finally, the energy-based Shi＆cai model with crack closure correction by means of Newman＇s method is highly recommended in prediction of fatigue crack growth of CIET specimens via low cycle fatigue properties.

关键词： CIET specimen Crack closure correction Energy-based fatigue crack growth predictive model Low cycle fatigue 5083-H112 aluminum alloy

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

INVESTIGATION ON COMPLIANCE ROTATION CORRECTION FOR COMPACT TENSILE SPECIMEN IN UNLOADING COMPLIANCE METHOD

引用

Acta Mechanica Solida Sinica 2011年第2期24卷 144-152页

作者： Chen Bao lixun cai School of Mechanics and Engineering Southwest Jiaotong University Chengdu 610031 China

The rotation correction method of unloading compliance for a compact tensile （CT） specimen in the current J-integral resistance curves or critical J-integral test standards was under suspicion by tracing to its source, and a new rotation correction method was proposed. The rotation center of the specimen is close to the crack tip, and the material constitutive relationship has little effect on the rotational radius R. If the formula for rotation correction recommended in current standards is used to measure the crack length of CT specimen, it will lead to larger error. A new formula with better accuracy for the crack length measurement of the CT specimen was presented.

关键词： ductile fracture toughness unloading compliance compact tensile specimen rotation correction

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A new method to predict fatigue crack growth rate of materials based on average cyclic plasticity strain damage accumulation

引用

Chinese Journal of Aeronautics 2013年第1期26卷 130-135页

作者： Chen Long cai lixun Yao Di School of Mechanics and Engineering Southwest Jiaotong University

By introducing a fatigue blunting factor, the cyclic elasto-plastic Hutchinson-Rice-Rosengren （HRR） field near the crack tip under the cyclic loading is modified. And, an average damage per loading-cycle in the cyclic plastic deformation region is defined due to Manson-Coffin law. Then, according to the linear damage accumulation theory-Miner law, a new model for predicting the fatigue crack growth （FCG） of the opening mode crack based on the low cycle fatigue （LCF） damage is set up. The step length of crack propagation is assumed to be the size of cyclic plastic zone. It is clear that every parameter of the new model has clearly physical meaning which does not need any human debugging. Based on the LCF test data, the FCG predictions given by the new model are consistent with the FCG test results of Cr2Ni2MoV and X12CrMoWVNbN 10-1-1. What＇s more, referring to the relative researches, the good predictability of the new model is also proved on six kinds of materials.

关键词： Cyclic elasto-plastic HRR field Cyclic plasticity strain damage Fatigue crack growth Low cycle fatigue Miner linear damage accumulation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A new approach on necking constitutive relationships of ductile materials at elevated temperatures

引用

Chinese Journal of Aeronautics 2016年第6期29卷 1626-1634页

作者： Yao Di cai lixun Bao Chen School of Mechanics and Engineering Southwest Jiaotong University

A new method is presented to determine the full-range, uniaxial constitutive relationship of materials by tensile tests on funnel specimens with small curvature radius and finite element analysis(FEA). An iteration method using FEA APDL(ANSYS parametric design language) programming has been developed to approach the necking constitutive relationship of materials. Test results from SAE 304 stainless steel at room temperature show that simulated load vs displacement curve,diameter at funnel root vs displacement curve, and funnel deformation contours are close to modeled results. Due to this new method, full-range constitutive relationships and true stress and effective true strain at failure are found for 316 L stainless steel, TA17 titanium alloy and A508-III stainless steel at room temperature, and 316 L stainless steel at various elevated temperatures.

关键词： Ductile material Elevated temperatures Finite element aided testing(FAT) method Fracture stress-strain True stress-strain

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Semi-analytical model for flat indentation of metal materials and its applications

引用

Chinese Journal of Aeronautics 2020年第12期33卷 3266-3277页

作者： Xiaokun LIU lixun cai Hui CHEN Shuqian SI Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province School of Mechanics and EngineeringSouthwest Jiaotong UniversityChengdu 610031China School of Civil Engineering Changsha University of Science&TechnologyChangsha 410114China

The increasing use of small material components in a wide range of industrial fields necessitates the development of an accurate and robust indentation testing *** this end,this paper proposes an Energy-density-equivalence for a Flat Indentation(E-FI)model based on the energy density equivalent *** proposed model describes the relationships among the material parameters of Hollomon's power law(H-law),flat indenter diameter,energy,and indentation *** E-FI Method(E-FIM)that determines the H-law parameters of materials through the indentation test is also *** energy-displacement curves forward-predicted by the E-FI model(based on known H-law parameters of materials)and the H-law parameters of materials given by the E-FIM(based on known energy-displacement curves)are consistent with the results of Finite Element Analysis(FEA)and the H-law parameters of materials used as the input for FEA,*** E-FIM,the goodness of fit for both stress–strain curves with H-law,predicted based on the displacement with 2%signal interference,and that for stress–strain curves without interference is more than *** stress–strain relations predicted by E-FIM were consistent with the results obtained via uniaxial tensile tests of ten ductile materials.

关键词： Energy-density-equivalence Flat indentation Power-law material Semi-analytical model Stress–strain relationship

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于小冲杆试验评价钛合金的高温拉伸性能

引用

机械工程材料 2024年第3期48卷 73-78页

作者：王柳翔韩光照郑洪周甜蔡力勋成都飞机工业(集团)有限责任公司成都610092 西南交通大学力学与航空航天学院应用力学与结构安全四川省重点实验室成都610031

基于能量密度等效理论,提出依据塑性弯曲阶段载荷-位移曲线,获取均匀连续、各向同性的钛合金圆片试样应力-应变曲线的小冲杆试验新方法;采用该方法预测得到不同名义屈服强度和硬化指数组合工况下假想材料的应力-应变数据,并与有限元预... 详细信息

基于能量密度等效理论,提出依据塑性弯曲阶段载荷-位移曲线,获取均匀连续、各向同性的钛合金圆片试样应力-应变曲线的小冲杆试验新方法;采用该方法预测得到不同名义屈服强度和硬化指数组合工况下假想材料的应力-应变数据,并与有限元预设曲线进行对比;基于小冲杆试验获得的TC4合金在室温、高温(400℃)下的载荷-位移曲线,采用上述方法获得该合金的真应力-真应变曲线,并与单轴拉伸真应力-应变曲线进行对比。结果表明:预测得到的假想材料应力-应变数据与有限元预设曲线之间的符合优度均高于0.96;预测获得的室温和400℃下TC4合金的真应力-真应变曲线与单轴拉伸曲线之间的符合优度均高于0.97,屈服强度和抗拉强度的最大相对误差分别为4.86%和4.63%,验证了该新方法的有效性。

关键词：小冲杆试验能量密度等效应力-应变关系钛合金高温拉伸性能

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：