Analysis of Fibre Stress Distributions in Woven Composites Using Raman Spectroscopy

2006 ◽  
Author(s):  
Robert Young ◽  
S.Y. Lei
Keyword(s):  
Raman Spectroscopy ◽  
Woven Composites ◽  
Stress Distributions ◽  
Fibre Stress

A MeshFree Micromechanical Analysis for Twill Composite

2016 ◽  
Vol 713 ◽  
pp. 338-341
Author(s):  
L. Li ◽  
M.H. Ferri Aliabadi
Keyword(s):  
Mechanical Properties ◽  
Cell Volume ◽  
Unit Cell Volume ◽  
Cell Stress ◽  
Unit Cell ◽  
Woven Composites ◽  
Stress Distributions ◽  
Cell Models ◽  
Stress Strain ◽  
Stress Strain Relation

This paper presents homogenization of twill woven composites. It includes presenting formulated geometrical unit cell models, establishing meshfree micromechanical and CDM models for twill woven composites. The results cover meshfree nodal distributions, meshfree yarn geometries, predicted mechanical properties, effectiveness of yarn waviness, non-linear stress-strain relation of unit cell, stress distributions inside unit cell volume, and necessary comparisons with existing literatures.

Determination of the axial and radial fibre stress distributions for the Broutman test

2004 ◽  
Vol 64 (2) ◽  
pp. 181-189 ◽  
Author(s):  
R. Sinclair ◽  
R.J. Young ◽  
R.D.S. Martin
Keyword(s):  
Stress Distributions ◽  
Fibre Stress

scholarly journals Super-Resolution Raman Spectroscopy by Digital Image Processing

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Motohiro Tomita ◽  
Hiroki Hashiguchi ◽  
Takuya Yamaguchi ◽  
Munehisa Takei ◽  
Daisuke Kosemura ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Spatial Resolution ◽  
Numerical Aperture ◽  
Super Resolution ◽  
Force Model ◽  
Stress Distributions ◽  
Si Substrate ◽  
Resolution Method ◽  
Strained Si ◽  
Edge Force

We demonstrate the results of a strain (stress) evaluation obtained from Raman spectroscopy measurements with the super-resolution method (the so-called super-resolution Raman spectroscopy) for a Si substrate with a patterned SiN film (serving as a strained Si sample). To improve the spatial resolution of Raman spectroscopy, we used the super-resolution method and a high-numerical-aperture immersion lens. Additionally, we estimated the spatial resolution by an edge force model (EFM) calculation. One- and two-dimensional stress distributions in the Si substrate with the patterned SiN film were obtained by super-resolution Raman spectroscopy. The results from both super-resolution Raman spectroscopy and the EFM calculation were compared and were found to correlate well. The best spatial resolution, 70 nm, was achieved by super-resolution Raman measurements with an oil immersion lens. We conclude that super-resolution Raman spectroscopy is a useful method for evaluating stress in miniaturized state-of-the-art transistors, and we believe that the super-resolution method will soon be a requisite technique.

EVALUATION OF RESIDUAL STRESS OF COPPER PIPE BY USING RAMAN SPECTROSCOPY

2008 ◽  
Vol 22 (11) ◽  
pp. 1007-1012
Author(s):  
SANG-YOUNG KIM ◽  
JAE-MEAN KOO ◽  
CHANG-SUNG SEOK
Keyword(s):  
Residual Stress ◽  
Raman Spectroscopy ◽  
Pure Copper ◽  
Fem Analysis ◽  
Bending Test ◽  
Raman Shift ◽  
Stress Distributions ◽  
Nondestructive Measurement ◽  
Bending Tests ◽  
Copper Pipe

In most cases, a straight pipe is used after complicated bending work in a mechanical system. In this work process, the plastic deformation of the pipe produces residual stress in the pipe. This residual stress significantly affects the behavior of pipe fracture. For this reason, residual stress must be evaluated. Measuring the residual stress of a U-shaped copper pipe is difficult with existing destructive and nondestructive measurement methods. In this paper, the residual stress of a U-shaped copper pipe (99.9% pure copper) was evaluated from the Raman shift by Raman spectroscopy and FEM analysis. Also, the results of the bending test by FEM analysis and experiments are compared. The analyzed results of Raman spectra had a similar tendency with the results of the FEM analysis in regard to the residual stress distributions in the U-shaped pipes. Also, the results of the bending tests were shown resemblance.

Raman spectroscopy and X-ray diffraction of lithium niobate at temperatures up to 1300○-4.80pt○C

2005 ◽  
Vol 126 ◽  
pp. 101-105 ◽  
Author(s):  
B. Moulin ◽  
L. Hennet ◽  
D. Thiaudière ◽  
P. Melin ◽  
P. Simon
Keyword(s):  
Raman Spectroscopy ◽  
Lithium Niobate ◽  
X Ray Diffraction ◽  
X Ray

Raman spectroscopy using a gas laser

1965 ◽  
Vol 26 (11) ◽  
pp. 620-626 ◽  
Author(s):  
J.P. Russell
Keyword(s):  
Raman Spectroscopy ◽  
Gas Laser

OBSERVATION OF PRETRANSITIONAL EFFECTS ON THE SHAPE OF THE E2 (17 cm-1 ) OPTICAL MODE IN β-Ag1 BY RAMAN SPECTROSCOPY

1981 ◽  
Vol 42 (C6) ◽  
pp. C6-776-C6-778
Author(s):  
E. Cazzanelli ◽  
A. Fontana ◽  
G. Mariotto ◽  
F. Rocca ◽  
M. P. Fontana
Keyword(s):  
Raman Spectroscopy ◽  
Optical Mode
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