Xuebin Wang, Wei Dong, Mei Yang, Bowen Zhang, Bin Yu. Inhomogeneous Strain Measurement Based on Least Absolute Deviation Fitting for Digital Image Correlation[J]. Acta Optica Sinica, 2020, 40(3): 0312001
- Acta Optica Sinica
- Vol. 40, Issue 3, 0312001 (2020)
Fig. 1. Schematic of DIC method
Fig. 2. Simulated speckle images. (a) Reference image;(b) shear band image with strain gradient
Fig. 3. Evolutions of E1 and fitting coefficient with N
Fig. 4. Distributions of average γxy. (a) Measuring point interval is 4 pixel; (b) measuring point interval is 2 pixel; (c) measuring point interval is 1 pixel
Fig. 5. Errors of average γxy. (a) Measuring point interval is 4 pixel; (b) measuring point interval is 2 pixel; (c) measuring point interval is 1 pixel
Fig. 6. Similar material model
Fig. 7. γmax of least square fitting for different Δx. (a) Δx=140; (b) Δx=300; (c) Δx=400
Fig. 8. γmax of least absolute deviation fitting for different Δx. (a) Δx=140; (b) Δx=300; (c) Δx=400
Fig. 9. Distributions of γmax in monitoring line for different Δx. (a) Δx=140; (b) Δx=300; (c) Δx=400
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Table 1. Comparison of time consumption of two methods
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