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

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.

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

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

Effect of surface elasticity on extensional and torsional stiffnesses of isotropic circular nanorods

2018 ◽  
Vol 24 (6) ◽  
pp. 1613-1629 ◽  
Author(s):  
Prakhar Gupta ◽  
Ajeet Kumar
Keyword(s):  
Residual Stress ◽  
Axial Force ◽  
Surface Elasticity ◽  
Surface Residual Stress ◽  
Molecular Statics ◽  
Stress Components ◽  
Stress Free State ◽  
Tungsten Material ◽  
Analytical Expressions ◽  
Effect Of Surface

We present a continuum formulation to obtain the effects of surface residual stress and surface elastic constants on extensional and torsional stiffnesses of isotropic circular nanorods. Analytical expressions of axial force, twisting moment, and extensional and torsional stiffnesses are obtained. Unlike the case of rectangular nanorods, we show that the stiffnesses of circular nanorods also depend on surface residual stress components. This is attributed to non-zero surface curvature inherent in circular nanorods. We further normalize these expressions and analyze their asymptotic limits in the limit of the nanorod’s radius approaching both zero and infinity, corresponding to surface-dominated and bulk-dominated regimes, respectively. Finally, we use the recently proposed helical Cauchy–Born rule and perform molecular statics calculations to obtain axial force, twisting moment, and stiffnesses of the tungsten nanorod. The tungsten material is selected since its bulk crystal exhibits isotropy in the stress-free state. The results from molecular statics calculations are shown to match the derived continuum formulas accurately.

Residual Stress Depth Profiling on Ground and on Polished Surfaces of an Al2O3/SiC(w) Composite

1995 ◽  
Vol 39 ◽  
pp. 371-380
Author(s):  
X. Zhu ◽  
P. Predecki ◽  
M. Eatough ◽  
R. Goebner
Keyword(s):  
Residual Stress ◽  
Depth Profiling ◽  
Grazing Incidence ◽  
Inversion Method ◽  
Laplace Method ◽  
X Ray Diffraction ◽  
Surface Residual Stress ◽  
Near Surface ◽  
X Ray ◽  
Stress Components

This study uses the asymmetric grazing incidence x-ray diffraction (GIXD) method and related z-profile retrieval techniques to study the near surface residual stress depth proflles on ground and on polished surfaces of hot-pressed Al2O2SiC(w) composite specimen. The z-profiles of stress components σ11, σ22 and σ33 of the Al2O3 matrix were obtained by using the numerical inversion method as well as the inverse Laplace method. Both τ- and z-profiles of residual stresses are presented.

Prediction of residual stress components and their directions from pile-up morphology: An experimental study

2016 ◽  
Vol 31 (16) ◽  
pp. 2392-2397
Author(s):  
Lei Shen ◽  
Yuming He ◽  
Dabiao Liu ◽  
Meng Wang ◽  
Jian Lei
Keyword(s):  
Residual Stress ◽  
Experimental Study ◽  
Pile Up ◽  
Stress Components ◽  
Image Position

Abstract

TEM investigations of surface residual stress relaxation in A12O3 and Al2O3-SiC nanocomposite

1994 ◽  
Vol 52 ◽  
pp. 628-629
Author(s):  
J. Fang ◽  
H. M. Chan ◽  
M. P. Harmer
Keyword(s):  
Residual Stress ◽  
Single Phase ◽  
Stress Relief ◽  
Stress Recovery ◽  
Surface Residual Stress ◽  
Microscopic Mechanism ◽  
Sic Particles ◽  
Annealing Procedure ◽  
The Difference ◽  
Nano Size

It was Niihara et al. who first discovered that the fracture strength of Al2O3 can be increased by incorporating as little as 5 vol.% of nano-size SiC particles (>1000 MPa), and that the strength would be improved further by a simple annealing procedure (>1500 MPa). This discovery has stimulated intense interest on Al2O3/SiC nanocomposites. Recent indentation studies by Fang et al. have shown that residual stress relief was more difficult in the nanocomposite than in pure Al2O3. In the present work, TEM was employed to investigate the microscopic mechanism(s) for the difference in the residual stress recovery in these two materials.Bulk samples of hot-pressed single phase Al2O3, and Al2O3 containing 5 vol.% 0.15 μm SiC particles were simultaneously polished with 15 μm diamond compound. Each sample was cut into two pieces, one of which was subsequently annealed at 1300° for 2 hours in flowing argon. Disks of 3 mm in diameter were cut from bulk samples.

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