19 Mud Shrinkage and Cracking Phenomenon Experimental …
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a
b
1100 mm
565 mm
30°
15°
15°
Camera 1
Camera 2
Lighting
Lighting
Balance
Hygrometer
Sample
Smooth Support
Vic Snap
Vic-3D
Salt
solution
Fig. 19.5 Drying test setup by Yang (2020). a Sample setup and controlled chamber. b Relative
humidity control and equilibrium in the test chamber
Strain variables are also generated in post-processing, with positive values
corresponding to extensions and negative values corresponding to compressions
1. ε xx (%)—normal component of strain in the x direction
2. ε yy (%)—normal component of strain in the y direction
3. ε xy (%)—distortion.
With Vic-3D, the outputs are:
The strain variables ε xx , ε yy , and ε xy are generated as in Vic-2D, and u z (mm),
which is the displacement along the z-axis (Fig. 19.6b).