Photoelastic characterization of residual strain in MWA SI InP crystal wafers

2002 ◽  
Author(s):  
M. Fukuzawa ◽  
M. Herms ◽  
M. Uchida ◽  
O. Oda ◽  
M. Yamada
Keyword(s):  
Residual Strain

scholarly journals An experimental study on the manufacture and characterization of in-plane fibre-waviness defects in composites

2018 ◽  
Vol 5 (5) ◽  
pp. 180082 ◽  
Author(s):  
W. J. R. Christian ◽  
F. A. DiazDelaO ◽  
K. Atherton ◽  
E. A. Patterson
Keyword(s):  
Residual Strain ◽  
Composite Structures ◽  
Computational Models ◽  
Image Correlation ◽  
Strain Fields ◽  
Strain Measurements ◽  
Ultrasound Measurements ◽  
Residual Strains ◽  
Failure Predictions

A new method has been developed for creating localized in-plane fibre waviness in composite coupons and used to create a large batch of specimens. This method could be used by manufacturers to experimentally explore the effect of fibre waviness on composite structures both directly and indirectly to develop and validate computational models. The specimens were assessed using ultrasound, digital image correlation and a novel inspection technique capable of measuring residual strain fields. To explore how the defect affects the performance of composite structures, the specimens were then loaded to failure. Predictions of remnant strength were made using a simple ultrasound damage metric and a new residual strain-based damage metric. The predictions made using residual strain measurements were found to be substantially more effective at characterizing ultimate strength than ultrasound measurements. This suggests that residual strains have a significant effect on the failure of laminates containing fibre waviness and that these strains could be incorporated into computational models to improve their ability to simulate the defect.

Raman scattering characterization of residual strain and alloy composition in bulk Si1−xGexcrystal

2004 ◽  
Vol 27 (1-3) ◽  
pp. 325-328 ◽  
Author(s):  
M. R. Islam ◽  
M. Yamada ◽  
N. V. Abrosimov ◽  
M. Kiyama ◽  
M. Tatsumi
Keyword(s):  
Raman Scattering ◽  
Residual Strain ◽  
Alloy Composition

Characterization of residual strain in epitaxial Ge layers grown in sub-100 nm width SiO2 trench arrays

2015 ◽  
Vol 580 ◽  
pp. 45-51 ◽  
Author(s):  
Byongju Kim ◽  
Hyunchul Jang ◽  
Sangmo Koo ◽  
Jeong-Hoon Kim ◽  
Dae-Hyun Kim ◽  
...  
Keyword(s):  
Residual Strain

Characterization of Residual Strain in Si Ingots Grown by the Seed-Cast Method

2013 ◽  
Vol 205-206 ◽  
pp. 94-99 ◽  
Author(s):  
Karolin Jiptner ◽  
Masayuki Fukuzawa ◽  
Yoshiji Miyamura ◽  
Hirofumi Harada ◽  
Koichi Kakimoto ◽  
...  
Keyword(s):  
High Temperature ◽  
Temperature Gradient ◽  
Residual Strain ◽  
Strain Distribution ◽  
High Temperature Region ◽  
Slow Cooling ◽  
Cooling Rates ◽  
Cooling Conditions ◽  
Fast Cooling

The residual strain distribution in cast-grown mono-like Si ingots is analyzed. The effect of the crucible during solidification and the influence of different cooling rates is described. To clarify in which process steps residual strain accumulates, several Si ingots were grown in a laboratory scale furnace (100mm) using different cooling conditions after completion of the solidification. For the cooling, two different cooling rates were distinguished: fast cooling (12deg/min) and slow cooling (5deg/min). It was found that changes in cooling gradients greatly influence the amount of residual strain. The results show that slow cooling in any temperature range leads to strain reduction. The greatest reduction could be found when the temperature gradient was changed to slow cooling in the high temperature region.

Varistor Ceramic: Residual Strain and Texture Analysis by Neutron Time-of-Flight Diffraction

2006 ◽  
Vol 524-525 ◽  
pp. 781-786
Author(s):  
Christian Scheffzük ◽  
Petra Kluge-Weiss ◽  
Felix Greuter
Keyword(s):  
Residual Strain ◽  
Radial Strain ◽  
Cylindrical Sample ◽  
Varistor Ceramic ◽  
Cylinder Axis ◽  
Time Of Flight Diffraction ◽  
Neutron Time ◽  
Strain Stress ◽  
Metal Oxide Varistor

Strain/stress experiments for characterization of micro- and macro-strain distribution and texture experiments were carried out on a varistor ceramic using neutron-TOF-diffraction. By a radial strain scan, residual strain has been determined on the (1010 ), (0002), (1012), and (1120 ) Bragg reflections of the hexagonal ZnO as well as on the (400) reflections of the cubic spinel Zn7Sb2O12. Residual strain values in the range of -1.5x10-4 (contraction) and 4x10-4 (dilatation) were observed for ZnO, with indications of macro-strains across the cylindrical sample and substantial micro-strains between the different phases. The texture on both phases (ZnO, Zn7Sb2O12) is characterized by a weak, non-ideal fibre texture around the cylinder axis. The results indicate that the texture pattern might coincide with the strain. To our knowledge, these are the first texture and residual strain investigations in metal oxide varistor elements and they will be discussed in detail.

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