Abstract
The rigid/plastic solutions are singular near certain surfaces. A special numerical method is required to solve such boundary value problems. The present paper develops such a method for two models of pressure-dependent plasticity. Both are based on the Mohr–Coulomb yield criterion. Stationary planar flows are considered. The numerical method is characteristics-based. Its distinguishing feature is employing the extended R–S method. The output of numerical solutions, in addition to stress and velocity fields, is the strain rate intensity factor, which controls the magnitude of the shear strain rate near the singular surface. The method applies to finding a solution for the flow of granular material through a wedge-shaped die. The accuracy of the solution is verified by comparison with an analytical solution for the flow through an infinite channel and an available numerical solution for pressure-independent material. An applied aspect of this study is that the strain rate intensity factor can be used in non-traditional constitutive equations for predicting the evolution of material properties near surfaces with high friction.
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Acknowledgements
This publication has been supported by the RUDN University Scientific Projects Grant System, project No. 202247-2-000.
Funding
This work was made possible by the NCKU 100 program. It was financially supported by the Ministry of Science and Technology of Taiwan (MOST 106-2923-E-194-002-MY3, 108-2221-E-006-228-MY3 and 108-2119-M-006-010) and Air Force Office of Science Research (AFOSR) under contract no. FA4869- 06-1-0056 AOARD 064053. Professor Yeau-Ren Jeng would like to acknowledge Medical Device Innovation Center (MDIC) from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education (MOE) in Taiwan and AC2T research GmbH (AC2T) in Austria (COMET InTribology, FFG-No.872176).
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Alexandrov, S., Kuo, CY. & Jeng, YR. An accurate numerical method of solving singular boundary value problems for the stationary flow of granular materials and its application. Continuum Mech. Thermodyn. 36, 171–195 (2024). https://doi.org/10.1007/s00161-023-01269-x
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DOI: https://doi.org/10.1007/s00161-023-01269-x