Spatial fringe analysis based on FFT using only two speckle pattern in ESPI

2013 ◽  
Author(s):  
Yasuhiko Arai
Keyword(s):  
Speckle Pattern ◽  
Fringe Analysis

scholarly journals Effect of Residual Stress on Thermal Deformation Behavior

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4141
Author(s):  
Sasaki ◽  
Yoshida ◽  
Ogawa ◽  
Shitaka ◽  
McGibboney
Keyword(s):  
Residual Stress ◽  
Thermal Expansion ◽  
Deformation Behavior ◽  
Thermal Deformation ◽  
Coefficient Of Thermal Expansion ◽  
Speckle Pattern ◽  
Steel Specimen ◽  
Fringe Analysis ◽  
Dissimilar Joints ◽  
Optical Visualization

This paper discusses a non-destructive measurement technique of residual stress through optical visualization. The least amount of deformation possible is applied to steel plates by heating the specimens +10 °C from room temperature for initial calibration, and the thermal expansion behavior is visualized with an electronic speckle pattern interferometer sensitive to two dimensional in-plane displacement. Displacement distribution with the thermal deformation and coefficient of thermal expansion are obtained through interferometric fringe analysis. The results suggest the change in the thermal deformation behavior is affected by the external stress initially applied to the steel specimen. Additionally, dissimilar joints of steel and cemented carbide plates are prepared by butt-brazing. The residual stress is estimated based on the stress dependence of thermal expansion coefficient.

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