Null strain analysis of submerged aneurysm analogues using a novel 3D stereomicroscopy device

Brooks A. Lane, Susan M. Lessner, Narendra R. Vyavahare, Michael A. Sutton and John F. Eberth

Computer Methods in Biomechanics and Biomedical Engineering, 2020, vol. 23, issue 8, 332-344

Abstract: To measure the inhomogeneous 3D-strain fields present during inflation-extension testing of physiologically submerged micro-aneurysms, a Stereo Digital Image Correlation (StereoDIC) microscopy system is developed that revolves 15° stereo-angle cameras around a centrally-mounted target. Calibration is performed using submerged dot patterns and system accuracy verified using strain and deformation analyses for rigid body motions of speckle-patterned, micro-aneurysmal surrogates. In terms of the Green-Lagrange strain tensor and the 3D displacement fields, the results are stable even after 120 minutes, with maxima in both strain bias and strain standard deviation less than 2E-03 for all components, and micron-level displacement standard deviation.

Date: 2020
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DOI: 10.1080/10255842.2020.1724974

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