Direct Measurements of Slip Irreversibility in a Nickel Base Superalloy Using High Resolution Digital Image Correlation

2019 ◽  
Author(s):  
J.C. Stinville ◽  
P.G. Callahan ◽  
M.A. Charpagne ◽  
M.P. Echlin ◽  
V. Valle ◽  
...  
Keyword(s):  
High Resolution ◽  
Digital Image Correlation ◽  
Digital Image ◽  
Image Correlation ◽  
Nickel Base Superalloy ◽  
Direct Measurements ◽  
Nickel Base ◽  
Base Superalloy

High-temperature strain field measurement using digital image correlation

2009 ◽  
Vol 44 (4) ◽  
pp. 263-271 ◽  
Author(s):  
B M B Grant ◽  
H J Stone ◽  
P J Withers ◽  
M Preuss
Keyword(s):  
Digital Image Correlation ◽  
Digital Image ◽  
Coefficient Of Thermal Expansion ◽  
Black Body ◽  
Black Body Radiation ◽  
Image Correlation ◽  
Nickel Base Superalloy ◽  
Reliable Determination ◽  
Nickel Base ◽  
Two Parameters

A method is presented for obtaining good images of sample surfaces at high temperatures, suitable for strain measurement, by digital image correlation (DIC) without the use of surface markers or speckles. This is accomplished by suppressing black-body radiation through the use of filters and blue illumination. Using only relatively low levels of illumination the method is demonstrated to be capable of providing accurate DIC measurements up to 1100 °C, and the potential to monitor strains to 1400 °C is identified. The capability of the method is demonstrated by measuring the Young's modulus and coefficient of thermal expansion of a nickel-base superalloy at temperatures from ambient to 1000 °C; two parameters that are well established in the literature and that require high strain sensitivity for their reliable determination.

scholarly journals Direct measurements of slip irreversibility in a nickel-based superalloy using high resolution digital image correlation

2020 ◽  
Vol 186 ◽  
pp. 172-189 ◽  
Author(s):  
J.C. Stinville ◽  
P.G. Callahan ◽  
M.A. Charpagne ◽  
M.P. Echlin ◽  
V. Valle ◽  
...  
Keyword(s):  
High Resolution ◽  
Digital Image Correlation ◽  
Digital Image ◽  
Image Correlation ◽  
Nickel Based Superalloy ◽  
Direct Measurements

scholarly journals Super Resolution Digital Image Correlation (SR-DIC): an Alternative to Image Stitching at High Magnifications

2021 ◽  
Author(s):  
R. S. Hansen ◽  
D. W. Waldram ◽  
T. Q. Thai ◽  
R. B. Berke
Keyword(s):  
High Resolution ◽  
Digital Image Correlation ◽  
Spatial Resolution ◽  
Digital Image ◽  
Super Resolution ◽  
Image Correlation ◽  
Low Resolution ◽  
Strain Measurements ◽  
Resolution Image ◽  
High Resolution Image

Abstract Background High-resolution Digital Image Correlation (DIC) measurements have previously been produced by stitching of neighboring images, which often requires short working distances. Separately, the image processing community has developed super resolution (SR) imaging techniques, which improve resolution by combining multiple overlapping images. Objective This work investigates the novel pairing of super resolution with digital image correlation, as an alternative method to produce high-resolution full-field strain measurements. Methods First, an image reconstruction test is performed, comparing the ability of three previously published SR algorithms to replicate a high-resolution image. Second, an applied translation is compared against DIC measurement using both low- and super-resolution images. Third, a ring sample is mechanically deformed and DIC strain measurements from low- and super-resolution images are compared. Results SR measurements show improvements compared to low-resolution images, although they do not perfectly replicate the high-resolution image. SR-DIC demonstrates reduced error and improved confidence in measuring rigid body translation when compared to low resolution alternatives, and it also shows improvement in spatial resolution for strain measurements of ring deformation. Conclusions Super resolution imaging can be effectively paired with Digital Image Correlation, offering improved spatial resolution, reduced error, and increased measurement confidence.

Camera array-based digital image correlation for high-resolution strain measurement

2018 ◽  
Vol 89 (10) ◽  
pp. 105110 ◽  
Author(s):  
Xinxing Shao ◽  
Zhenning Chen ◽  
Xiangjun Dai ◽  
Xiaoyuan He
Keyword(s):  
High Resolution ◽  
Digital Image Correlation ◽  
Digital Image ◽  
Strain Measurement ◽  
Image Correlation ◽  
Camera Array
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