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Integrated Photoelasticity in a Soft Material: Phase Retardation, Azimuthal Angle, and Stress-Optic Coefficient

SSRN, ISSN: 1556-5068
2022
  • 2
    Citations
  • 583
    Usage
  • 0
    Captures
  • 0
    Mentions
  • 1
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    2
    • Citation Indexes
      2
  • Usage
    583
    • Abstract Views
      473
    • Downloads
      110
  • Social Media
    1
    • Shares, Likes & Comments
      1
      • Facebook
        1
  • Ratings
    • Download Rank
      502,327

Article Description

Integrated photoelasticity is investigated for a soft material subjected to a three-dimensional stress state with large deformation. Our measurement target is designed based on the three-dimensional Hertzian contact problem, i.e., a solid sphere is pressed against a gelatin gel (Young’s modulus is about 4.2 kPa) with varying applied forces from zero to the maximum force that deforms the gel up to approximately 4.5 mm. The resulting photoelastic parameters (phase retardation and azimuthal angle) in the gel are measured using a polarization camera. The measured retardation and azimuth are compared with the analytical prediction based on Hertzian contact theory. Remarkably, experimental and analytical results of the photoelastic parameters show a reasonable agreement not only in the retardation but also in the azimuth that is related to the direction of principal stresses and but rarely validated in previous studies, is essential for reconstructing three-dimensional stress fields in soft materials. In addition, the stress-optic coefficient of the gelatin gel used is measured to be 3.12×10 -8  1/Pa. Such findings proved that integrated photoelasticity is useful for measuring the three-dimensional stress field in soft materials, which is of importance in biomedical engineering and cell printing applications.

Bibliographic Details

Yuto Yokoyama; Benjamin R. Mitchell; Ali Nassiri; Brad L. Kinsey; Yannis P. Korkolis; Yosiyuki Tagawa

Elsevier BV

Multidisciplinary; Integrated photoelasticity; Soft material; Gelatin; Azimuthal angle; Stress-optic coefficient

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