Fig 1.
Schematic of the experimental system for measuring strain using Tomo-PIV.
(a) Silicone specimen. (b) Schematic drawing of the area of strain measurement. (c) Top view of the experimental system. (d) Front view of the experimental system. (e) Experimental system.
Table 1.
Experimental parameters for strain measurements.
Fig 2.
Procedure of 3D strain analysis in specimens incorporating fluorescent particles using Tomo-PIV.
Fig 3.
Influence of the particle density of specimens on 3D strain measurement using Tomo-PIV with interrogation voxel sizes of 64 × 64 × 64 voxels for the specimens.
Specimens with particle densities of 0.008, 0.014, 0.020, and 0.026 ppp were compared at the cross section Z = 0 mm. (a) Distributions of the correlation values between the first two successive 3D images and the normal strain. (b) Correlation value between the first two successive 3D images. (c) Normal strain. (d) Measurement error of the normal strain.
Fig 4.
Influence of interrogation voxel size on the 3D strain measurements of specimens with a particle density of 0.014 ppp using Tomo-PIV.
Interrogation voxel sizes of 32 × 32 × 32, 40 × 40 × 40, 48 × 48 × 48, 56 × 56 × 56, and 64 × 64 × 64 voxels for the specimen were compared at the cross section Z = 0 mm. (a) Distributions of the correlation values between the first two successive 3D images and the normal strain. (b) Correlation value between the first two successive 3D images. (c) Normal strain. (d) Measurement error of the normal strain.
Fig 5.
3D strain measurement using Tomo-PIV with an interrogation voxel size of 40 × 40 × 40 voxels for a specimen with a particle density of 0.014 ppp at each cross section.
(a) Distributions of the correlation values between the first two successive 3D images and the normal strain. (b) Correlation value between the first two successive 3D images. (c) Normal strain. (d) Maximum measurement error of the normal strain.