HIGH-TEMPERATURE, HIGH-SENSITIVITY MOIRÉ INTERFEROMETRY

1993 ◽  
Vol 17 (3) ◽  
pp. 29-33 ◽  
Author(s):  
R. Czarnek ◽  
J.J. Wu ◽  
S.Y. Lin ◽  
J. Lee
Keyword(s):  
High Temperature ◽  
High Sensitivity ◽  
Moiré Interferometry ◽  
Moire Interferometry

The Creep Measurement of 475°C Pipeline Using Moire Interferometry

1998 ◽  
Vol 120 (2) ◽  
pp. 144-148 ◽  
Author(s):  
X. Huimin ◽  
Z. Daqing ◽  
D. Fulong ◽  
Z. Wei ◽  
P. Dietz ◽  
...  
Keyword(s):  
High Temperature ◽  
Power Plant ◽  
Experimental Method ◽  
Moiré Interferometry ◽  
Experimental Results ◽  
Measuring Error ◽  
Moire Interferometry ◽  
Interferometry Method ◽  
Main Steam ◽  
Creep Measurement

In this study, a new experimental method for measuring the creep of pipeline using moire interferometry was proposed. Curved-surface-deformed grating replicating technique was combined with the high-temperature-resistant grating and moire interferometry method, and was applied to measure the creep of a 475°C main steam pipeline in the Qinghe Power Plant for 3600 h. The measuring principle and experimental techniques are described. The measuring error and experimental results are discussed in detail.

Residual Stress Measurement in Spot Welds and the Effect of Fatigue Loading on Redistribution of Stresses Using High Sensitivity Moire´ Interferometry

2000 ◽  
Vol 123 (1) ◽  
pp. 132-138 ◽  
Author(s):  
Sanjeev K. Khanna ◽  
Canlong He ◽  
Hari N. Agrawal
Keyword(s):  
Residual Stress ◽  
Stress Measurement ◽  
Low Cycle Fatigue ◽  
High Sensitivity ◽  
Fatigue Loading ◽  
Moiré Interferometry ◽  
Spot Weld ◽  
Moire Interferometry ◽  
Spot Welds ◽  
Full Field

Residual stress distribution has been determined in spot welds, which are generally used to join mild steel sheets. Various spot weld configurations were investigated using the full-field, experimental, optical technique of high sensitivity moire´ interferometry. These stresses were found to be in the range 250–300 MPa (tensile) in the center and decreased to 40–100 MPa (tensile) at the edge of the weld nugget. Low cycle fatigue loading of the spot weld caused the residual stress to drop in the weld center by about 30 percent and increase at the edges by as much as 100 percent.

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