Stress Estimation Using Digital Image Correlation with Compensation of Camera Motion-Induced Error
Abstract
:1. Introduction
2. Residual Stress Estimation
2.1. Residual Stress Estimation
2.2. Residual Stress Estimation with Camera Motion-Induced Error
3. Camera Motion-Independent Residual Stress Estimation
3.1. Extraction of Homography-Independent Component
3.2. Residual Stress Estimation Using the Homography-Independent Terms
3.3. Summary of the Proposed Method
- E, ν, a, n, x, and y are given before the measurement based on the material properties, hole-drilling scheme, and image resolution.
- Derive , , , , , and using the given E, ν, a, n, x, and y (known at step 1) based on Equation (2)–(10).
- Derive , , , , , and by numerically generating multiple pairs of displacement fields (uh, vh) and residual stresses (σx, σy, τxy) based on Equations (31) and (32).
- Derive , , , , , and by subtracting , , , , , and (derived at step 3), respectively from , , ,, , and (derived at step 2) based on Equation (25).
- Obtain the displacement field uhole+motion and vhole+motion by applying DIC to the images of before and after the hole drill engaged with camera motion.
- Compute H in Equation (22) by using correspondences between {x, y} (known at step 1) and {uhole+motion, vhole+motion} (obtained at step 5) for all material points using direct linear transform [35].
- Compute and by using uhole+motion and vhole+motion (obtained at step 5) in combination with H (obtained at step 6) based on Equations (22)–(24).
- Compute the residual stresses σx, σy, and τxy using and (obtained at step 7) in combination with , , , , , and (derived at step 4) using Equation (27).
4. Numerical Validation
4.1. Numerical Generation of the Displacement Field
4.2. Stress Estimation Using the Proposed Method
5. Laboratory-Scale Validation
6. Conclusions
Author Contributions
Funding
Conflicts of Interest
Nomenclature
σx | In-plane residual stress (normal stress along x direction). |
σy | In-plane residual stress (normal stress along y direction). |
τxy | In-plane residual stress (shear stress). |
xi | x coordinate of i-th material point. |
yi | y coordinate of i-th material point. |
uhole(xi, yi) | x directional displacement at {xi, yi} induced by hole-drilling. |
vhole(xi, yi) | y directional displacement at {xi, yi} induced by hole-drilling. |
umotion(xi, yi) | x directional displacement at {xi, yi} induced by camera motion. |
vmotion(xi, yi) | y directional displacement at {xi, yi} induced by camera motion. |
uhole+motion(xi, yi) | x directional displacement at {xi, yi} induced by hole-drilling and camera motion. |
vhole+motion(xi, yi) | y directional displacement at {xi, yi} induced by hole-drilling and camera motion. |
uh(xi, yi) | Homography-dependent x directional displacement among uhole+motion(xi, yi). |
vh(xi, yi) | Homography-dependent y directional displacement among vhole+motion(xi, yi). |
(xi, yi) | Homography-independent x directional displacement among uhole+motion(xi, yi). |
(xi, yi) | Homography-independent y directional displacement among vhole+motion(xi, yi). |
Pu | Stress coefficient for linear relationship between σx and uhole(xi, yi). |
Qu | Stress coefficient for linear relationship between σy and uhole(xi, yi). |
Ru | Stress coefficient for linear relationship between τxy and uhole(xi, yi). |
Pv | Stress coefficient for linear relationship between σx and vhole(xi, yi). |
Qv | Stress coefficient for linear relationship between σy and vhole(xi, yi). |
Rv | Stress coefficient for linear relationship between τxy and vhole(xi, yi). |
Puh | Stress coefficient for linear relationship between σx and uh(xi, yi). |
Quh | Stress coefficient for linear relationship between σy and uh(xi, yi). |
Ruh | Stress coefficient for linear relationship between τxy and uh(xi, yi). |
Pvh | Stress coefficient for linear relationship between σx and vh(xi, yi). |
Qvh | Stress coefficient for linear relationship between σy and vh(xi, yi). |
Rvh | Stress coefficient for linear relationship between τxy and vh(xi, yi). |
Puh | Stress coefficient for linear relationship between σx and uh(xi, yi). |
Quh | Stress coefficient for linear relationship between σy and uh(xi, yi). |
Ruh | Stress coefficient for linear relationship between τxy and uh(xi, yi). |
Pvh | Stress coefficient for linear relationship between σx and vh(xi, yi). |
Qvh | Stress coefficient for linear relationship between σy and vh(xi, yi). |
Rvh | Stress coefficient for linear relationship between τxy and vh(xi, yi). |
Stress coefficient for linear relationship between σx and (xi, yi). | |
Stress coefficient for linear relationship between σy and (xi, yi). | |
Stress coefficient for linear relationship between τxy and (xi, yi). | |
Stress coefficient for linear relationship between σx and (xi, yi). | |
Stress coefficient for linear relationship between σy and (xi, yi). | |
Stress coefficient for linear relationship between τxy and (xi, yi). | |
IC1 | Image coordinate system before the hole-drilling and camera motion. |
IC2 | Image coordinate system after the hole-drilling and camera motion. |
s | Scaling factor that holds the third component (w) of the homogeneous representation {x, y, w}T in 1. |
HIC1→IC2 | Homography transform from IC1 to IC2 associated with 6DOF camera motion. |
Hh | Principal homography transform. |
H | HIC1→IC2Hh. |
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Item | Model | Specification |
---|---|---|
Camera | Sony α7R II | Resolution: 7952 × 5304 pixels |
Lens | SEL50M28 | Focal length: 50 mm |
Test | Stress (MPa) | Camera Motions | |||||||
---|---|---|---|---|---|---|---|---|---|
Rotation (mrad) | Translation (mm) | ||||||||
σx | σy | τxy | rx | ry | rz | tx | ty | tz | |
1–10 | 20 | −5 | 2 | [−10, 10] | 0 | 0 | 0 | 0 | 0 |
11–20 | 0 | [−10, 10] | 0 | 0 | 0 | 0 | |||
21–30 | 0 | 0 | [−10, 10] | 0 | 0 | 0 | |||
31–40 | 0 | 0 | 0 | [−5, 5] | 0 | 0 | |||
41–50 | 0 | 0 | 0 | 0 | [−5, 5] | 0 | |||
51–60 | 0 | 0 | 0 | 0 | 0 | [−5, 5] | |||
61–100 | unif(−50, 50) * | unif(−10, 10) * | unif(−5, 5) * |
Property | Value |
---|---|
Young’s modulus | 2.46 MPa |
Poisson’s ratio | 0.1 |
Dimension (height × width × depth) | 230 × 150 × 75 mm |
Hole diameter | 14 mm |
Pixel resolution | 7952 × 5304 |
Pixel density | 108.26 pixel/mm |
Test | True stress (KPa) | Estimated Stresses (KPa) | Error (KPa) σy−σy,true | ||
---|---|---|---|---|---|
σy,true | σx | σy | τxy | ||
1 | −100.0 | −29.3 | −101.3 | +1.2 | −1.3 |
2 | −100.0 | −21.6 | −103.1 | −3.7 | −3.1 |
3 | −100.0 | −39.2 | −107.1 | −3.0 | −7.1 |
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Lee, J.; Jeong, S.; Lee, Y.-J.; Sim, S.-H. Stress Estimation Using Digital Image Correlation with Compensation of Camera Motion-Induced Error. Sensors 2019, 19, 5503. https://doi.org/10.3390/s19245503
Lee J, Jeong S, Lee Y-J, Sim S-H. Stress Estimation Using Digital Image Correlation with Compensation of Camera Motion-Induced Error. Sensors. 2019; 19(24):5503. https://doi.org/10.3390/s19245503
Chicago/Turabian StyleLee, Junhwa, Seunghoo Jeong, Young-Joo Lee, and Sung-Han Sim. 2019. "Stress Estimation Using Digital Image Correlation with Compensation of Camera Motion-Induced Error" Sensors 19, no. 24: 5503. https://doi.org/10.3390/s19245503
APA StyleLee, J., Jeong, S., Lee, Y.-J., & Sim, S.-H. (2019). Stress Estimation Using Digital Image Correlation with Compensation of Camera Motion-Induced Error. Sensors, 19(24), 5503. https://doi.org/10.3390/s19245503