An Experimental Study of the Vibrational Characteristics of a Diamond Circular Blade Using Electronic Speckle-Pattern Interferometry and FEM

The compact installation and technology for determining vibration characteristics by the ESPI method has been created. The experimental determination of the dynamic characteristics of a diamond circular blade with a diameter of 203.4 mm and a thickness of 1.19 mm using real-time electronic speckle interferometry is presented. 15 mode shapes of vibration were detected in the range from 100 to 5000 Hz. The program calculation of the natural frequencies and mode shapes is carried out for three values of the clamping inner diameter (42 mm, 44 mm, 46 mm). The options for calculating a disk with a rim and without a rim are considered. It is shown that the minimum mean squared error of the calculation is achieved for the values of the diameter of the disk 46 mm, 42 mm and 44 mm for the number of nodal circles 0, 1 and 2, respectively. To verify the accuracy of the interferometer, experimental, computational and analytical studies of console steel rod 200 × 22.25 × 3.78 mm in size were carried out.

Analysis of Experimental IOP-Induced Scleral Deformations at the Sub-Micrometer Scale Using Electronic Speckle Interferometry

The retinal ganglion cell axons carry visual information, and pass through the optic nerve head (ONH) as they traverse from inside the eye to the brain. The ONH is the site of axonal damage in glaucoma, the second leading cause of blindness in the world, and ONH biomechanics is hypothesized to play a crucial role in the development and progression of the disease. The load bearing tissues of the ONH insert into the surrounding sclera, which provides the boundary conditions for this important structure. It is therefore important to develop accurate experimental techniques to measure scleral shell deformations under intraocular pressure (IOP) loading that can be used to drive constitutive and computational models of scleral biomechanics. The overall goal of this project is to better understand the role of ocular biomechanics in the development of glaucoma by constructing eye-specific finite element models of the posterior pole and ONH.