检索结果-南通市图书馆

Evolution of residual stress field in 6N01 aluminum alloy friction stir welding joint

China Welding 2018年第4期27卷 18-26页

作者： Liu Jialun Zhu Hao Jiang Yue Qi Fangjuan Wang Jun School of Materials Science and Engineering Shijiazhuang TIEDAO University Shijiazhuang 050043 China Hebei Provincial Key Laboratory of Traffic Engineering Materials Shijiazhuang 050043 China School of Mechanical Engineering Jiangsu University of Science and Technology Suzhou 215009 China School of Materials Science and Engineering Hebei University of Science and Technology Shijiazhuang 050018 China

Based on the characteristics of friction stir welding( FSW) and Coulomb friction work theory,the residual stresses field of FSW joints of 6 N01 aluminum alloy( T5),which was used in high speed train,were calculated by using the ANSYS finite element software. During the FEM calculation,the dual heat source models namely the body heat source and surface heat source were used to explore the evolution law of the welding process to the residual stress field. The method of ultrasonic residual stress detecting was used to investigate the residual stresses field of the 6 N01 aluminum alloy FSW joints. The results show that the steady-state temperature of 6 N01 aluminum alloy during FSW is about 550 ℃,and the temperature mutates at the beginning and at end of welding. The longitudinal residual stress σ_x is the main stress,which fluctuates in the range of-25 to 242 MPa. Moreover,the stress in the range of shaft shoulder is tensile stress that the maximum tensile stress is 242 MPa,and the stress in the outside of shaft shoulder is compressive stress that the maximum compressive stress is 25 MPa. The distribution of the tensile stress in the welding nugget zone( WNZ) is obviously bimodal,and the residual stress on the advancing side is higher than that on the retreating side. With the increasing of the welding speed,the maximum temperature decreased and the maximum residual stress decreased when the pin-wheel speed kept constant. With the increasing of the pin-wheel speed,the maximum temperature of the joint increased and the maximum residual stress increased when the welding speed was constant. The experimental results were in good agreement with the finite element results.

关键词： 6N01 aluminum alloy friction stir welding finite element simulation temperature field residual stress field

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 field and Toughening Mechanism for Composite Ceramic with Eutectic Interphases

Residual Stress Field and Toughening Mechanism for Composite...

引用

2012年海峡两岸破坏科学/材料试验学术会议

作者： Xiequan Liu Yunwei Fu Xinhua Ni Baohong Han Department of Basic Course Mechanical Engineering College

The four-phase-model method is used to study residual stress field of composite ceramic with eutectic *** matrix,Interphase and fiber inclusion are isotropy, the residual stress distribution of composite ceramic with eutectic interphase is *** size dependence of residual stresses is *** residual-stress-field in the eutectic ceramic rod relates to the stiffness,thermal expansion coefficients,shape and volume content of inclusions and interphases in the eutectic ceramic *** basis of the residual-stress-field in the eutectic ceramic rod,the frictional force on the boundary of the eutectic ceramic rod can be *** the frictional work is *** toughening mechanism of residual stresses is *** result shows that the toughening value is dependent on the size of fiber inclusion in the eutectic rod.

关键词： Eutectic Ceramic Rod Fiber Inclusion residual stress field Toughening Mechanism Size Dependence

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

SIMPLE SHAKEDOWN OF STRUCTURES UNDER VARIABLE MULTI-LOADINGS

引用

Acta Mechanica Solida Sinica 2008年第2期21卷 141-148页

作者： Yuall Yuall Yingqiang Xu Guozhi Lu School of Aeronautics Northwestern Polytechnical University Xian 710072 China

The shakedown analysis of structures under variable multi-loadings is considered, and the corresponding simple shakedown condition is presented in this paper. Distribution of fixed stresses field is given, and the self-equilibrium of fixed stresses field is analyzed. Elastic shakedown and plastic shakedown conditions are presented based on the fixed stresses field. The theorem is convenient to evaluate the shakedown limit of structures under cyclical variable multiloadings through solving positive scalar fields and fixed stresses field factors at a series of dangerous positions of the structure, and tedious computations are avoided. Finally the theorem is applied to a thick-walled cylindrical tube under variable pressure and temperature, and the rolling contact problem. The results are in good agreement with some computational results.

关键词： shakedown limit residual stress field variable multi-loadings

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

Characterization of EBPVD micro-layer composites and simulation of its internal stress state

引用

Journal of Central South University of Technology 2005年第1期12卷 27-30页

作者：史丽萍赫晓东 Center for Composite Materials and Structure Harbin Institute of Technology Harbin 150001 China

Based on the basic operating principal and the technology characteristic of electron beam physical vapor deposition(EBPVD) technique, EBPVD was used to prepare the micro-layer composites. The effect on the substrate preheating temperature was taken into accounts and the finite element analysis package ANSYS was used to simulate the internal stress field and the potential displacement changing tendency. The results show that one of the most important quality factors on the judgment of micro-layer composites is the adhesion between the substrate and the deposition layers as well as among the different deposition layers. Besides the existance of temperature gradient through the thickness of layers, the main reason for the internal stress in micro-layer composites is the mismatch of various properties of the layer and the substrate of different thermal expansions and crystal lattice types. With the increase of substrate preheating temperature, the inter-laminar shear stress also takes on a tendency of increase but the axial residual stress decrease.

关键词： micro-layer composites electron beam physical vapor deposition residual stress field finite element analysis

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

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

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：