Estimation of residual stress of metal material without plastic plateau by using continuous spherical indentation

2019 ◽  
Vol 172 ◽  
pp. 373-378 ◽  
Author(s):  
Zhanyu Wang ◽  
Leixiong Deng ◽  
Jianping Zhao
Keyword(s):  
Residual Stress ◽  
Spherical Indentation ◽  
Metal Material

scholarly journals Residual Stress Improvement Mechanism on Metal Material by Underwater Laser Irradiation.

2000 ◽  
Vol 42 (6) ◽  
pp. 567-573 ◽  
Author(s):  
Yuji SANO ◽  
Masaki YODA ◽  
Naruhiko MUKAI ◽  
Minoru OBATA ◽  
Masanori KANNO ◽  
...  
Keyword(s):  
Residual Stress ◽  
Laser Irradiation ◽  
Metal Material ◽  
Underwater Laser

The Research of Surface Residual Stress about Glass Ceramics

2012 ◽  
Vol 226-228 ◽  
pp. 2014-2018
Author(s):  
Jing He Wang ◽  
Kui Wang ◽  
Xun Wang ◽  
Wei Song ◽  
Xiao Li Song ◽  
...  
Keyword(s):  
Residual Stress ◽  
Yield Stress ◽  
Glass Ceramics ◽  
Contact Theory ◽  
Spherical Indentation ◽  
Calculation Formula ◽  
Processing Quality ◽  
Surface Residual Stress ◽  
Stress Strain ◽  
Nano Indentation

We have researched the residual stress in super-smooth glass ceramics using nano-indentation technology, according to the characteristic that the residual stress in the process of pressure is sensitive to the pileup around the indenter, we can determine the changing area, then combine this with the elasto-plastic contact theory, thus the residual stress calculation formula is obtained. By the continuous strain obtained by a spherical indenter and the research on the yield stress and stress-strain curves of microcrystalline glass through spherical indentation experiments, we can get the rule which can tell us how the residual stress of the microcrystalline glass changes with the depth from surface. This research helps to improve the processing quality as well as the performance of the super-smooth surfaced microcrystalline glass, obviously it has a wide application prospect.

Determination of Residual Stress and Strain-Hardening Exponent Using Artificial Neural Networks

2012 ◽  
Vol 472-475 ◽  
pp. 332-335
Author(s):  
Chun Ping Guan ◽  
Hong Ping Jin
Keyword(s):  
Residual Stress ◽  
Strain Hardening ◽  
Material Properties ◽  
Plastic Material ◽  
Spherical Indentation ◽  
Strain Hardening Exponent ◽  
Stress And Strain ◽  
Ann Model ◽  
Artificial Neural ◽  
Artificial Neural Network Ann

Through dimensional analysis of indentation parameters in this study, we propose an artificial neural network (ANN) model to extract the residual stress and strain-hardening exponent based on spherical indentation. The relationships between indentation parameters and the residual stress and material properties are numerically calibrated through training and validation of the ANN model. They enable the direct mapping of the characteristics of the indentation parameters to the residual stress and the elastic-plastic material properties. The proposed ANN model can be used to quickly and effectively determine the residual stress and strain-hardening exponent.

Research on Welding Repair for Reheating Hot Pipe Elbow of 325MW Station Boiler

2012 ◽  
Vol 516-517 ◽  
pp. 414-418 ◽  
Author(s):  
Xiang Feng Zheng ◽  
Qing Wang ◽  
Yan Ting Feng ◽  
Xiao Guang Niu ◽  
Xiao Jun Hao ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Residual Stress ◽  
Base Metal ◽  
Heat Input ◽  
Welding Residual Stress ◽  
Fusion Line ◽  
Metallographic Examination ◽  
Microscope Analysis ◽  
Metal Material ◽  
Pipe Elbow

Through methods, such as microscope analysis, metallographic examination, the crack located nearby the fusion line between reheating hot pipe elbow and blocking valve is reheat crack. The base metal material and excessive welding residual stress are the primary inducement of crack. In replacing pipe elbow, the measures of reducing residual stress, such as hammer blowing ,lower welding heat input, post welding heat treatment and so on, were taken. The welding repair succeeded greatly.

Surface residual stress in soda-lime glass evaluated using instrumented spherical indentation testing

2015 ◽  
Vol 50 (23) ◽  
pp. 7752-7759 ◽  
Author(s):  
Seung-min Ahn ◽  
Sun-Young Park ◽  
Young-Cheon Kim ◽  
Kang-Sun Lee ◽  
Ju-Young Kim
Keyword(s):  
Residual Stress ◽  
Soda Lime ◽  
Spherical Indentation ◽  
Soda Lime Glass ◽  
Indentation Testing ◽  
Surface Residual Stress

Numerical Simulation of Spherical Indentation Method to Identify Metal Material Properties

2015 ◽  
Vol 1119 ◽  
pp. 779-782
Author(s):  
Rong Chen ◽  
Xiao Yang Li ◽  
Lin Lin Zhang ◽  
Xiang Yu Wang
Keyword(s):  
Yield Strength ◽  
Material Properties ◽  
Equivalent Plastic Strain ◽  
Spherical Indentation ◽  
Displacement Curve ◽  
Metal Material ◽  
Perfectly Plastic ◽  
Indentation Process ◽  
Plastic Modulus ◽  
Elastic Perfectly Plastic

The main objective of this paper is to study the indentation process of the spherical indenter by finite element method (FEM). Elastic-plastic model is established and the effect of metal material properties (plastic modulus, yield strength) on response of load-displacement curve during the loading-unloading process is discussed in detail. FEM results indicate that the maximum indentation depths are smaller with larger plastic modulus. For elastic–perfectly plastic materials, the equivalent plastic strain (EPS) grows with the increase of pressed depth and the plastic impact area is constantly changing. In addition, the generated Max depth decreases with the increase of yield strength under the same load. Besides, friction coefficients have little effect on the indentation process. This research provides a theoretical basis for experiment and engineering.

A novel method for determining surface residual stress components and their directions in spherical indentation

2015 ◽  
Vol 30 (8) ◽  
pp. 1078-1089 ◽  
Author(s):  
Lei Shen ◽  
Yuming He ◽  
Dabiao Liu ◽  
Qiang Gong ◽  
Bo Zhang ◽  
...  
Keyword(s):  
Residual Stress ◽  
Spherical Indentation ◽  
Surface Residual Stress ◽  
Stress Components ◽  
Novel Method ◽  
Image Position

Abstract

scholarly journals Spherical indentation method for estimating equibiaxial residual stress and elastic–plastic properties of metals simultaneously

2018 ◽  
Vol 33 (8) ◽  
pp. 884-897 ◽  
Author(s):  
Guangjian Peng ◽  
Zhike Lu ◽  
Yi Ma ◽  
Yihui Feng ◽  
Yong Huan ◽  
...  
Keyword(s):  
Residual Stress ◽  
Spherical Indentation ◽  
Indentation Method ◽  
Plastic Properties ◽  
Elastic Plastic ◽  
Image Position

Abstract

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