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Finite element optimization of sample geometry for measuring the torsional shear strength of glass/metal joints

Fakouri Hasanabadi, M ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ceramint.2019.10.221
  3. Publisher: Elsevier Ltd , 2020
  4. Abstract:
  5. Assessment of mechanical properties of glass/metal joints is a challenging process, especially when the application relevant conditions of the joints have to be considered in the test design. In this study, a finite element method (FEM) is implemented to analyze a torsional shear strength test designed for glass-ceramic/steel joints aiming towards solid oxide fuel/electrolysis cells application. Deviations from axial symmetry of the square flanges (ends) of respective hourglass-shaped specimens and also supporting and loading sockets of the test set-up are included in the model to simulate conditions close to reality. Undesirable tensile stress and also shear stress concentration appear at the outer edge of glass-ceramic layers, which are less for the hollow-full specimen. The simulation results show that for a specimen with either 9 mm thick square- or 6 mm thick triangular-flanges, locally enhanced tensile stresses almost disappear, resulting in a symmetric shear stress distribution. The difference between the analytically derived nominal shear strength and the real critical shear stress derived via simulation reduces with decreasing the fracture torque. © 2019 Elsevier Ltd and Techna Group S.r.l
  6. Keywords:
  7. Finite element simulation ; Optimization ; Sealant ; Solid oxide cells ; Stress ; Torsion test ; Biomechanics ; Ceramic materials ; Fasteners ; Flanges ; Geometry ; Glass ; Sealants ; Shear stress ; Solid oxide fuel cells (SOFC) ; Stress concentration ; Stresses ; Tensile stress ; Torsion testing ; Axial symmetry ; Ceramic layer ; Critical shear stress ; Finite element simulations ; Nominal shear strength ; Sample geometry ; Solid-oxide cells ; Torsional shear ; Finite element method
  8. Source: Ceramics International ; Volume 46, Issue 4 , 2020 , Pages 4857-4863
  9. URL: https://www.sciencedirect.com/science/article/pii/S0272884219330950