Finite element optimization of sample geometry for measuring the torsional shear strength of glass/metal joints |
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Affiliation: | 1. College of Materials Science and Engineering, Fuzhou University, Fuzhou, Fujian 350108, China;2. College of Environment Resources, Fuzhou Unversity, Fuzhou 350116, China;3. Department of Materials Science and Engineering, National United University, Miao-Li 36003, Taiwan, ROC;1. Institute of High-Temperature Electrochemistry, UB RAS, Yekaterinburg, Russia;2. Yeltsin Ural Federal University, Yekaterinburg, Russia;3. School of Chemical Engineering College of Engineering and Physical Sciences University of Birmingham, Edgbaston, United Kingdom;1. College of Materials Science and Engineering, Fuzhou University, Fuzhou, Fujian 350108, China;2. High Magnetic Field Laboratory, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, Anhui, China |
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Abstract: | 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. |
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Keywords: | Torsion test Finite element simulation Solid oxide cells Sealant Stress Optimization |
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