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Computational Modeling of Tool-Rock Frictional Contact With Anisotropic Damage
https://orcid.org/0000-0002-7965-6592
AbstractThe mechanism of frictional contact is investigated between a blunt tool and quasi-brittle rocks with anisotropic damage. A recently developed anisotropic elasto-plastic-damage model is further validated using experimental results under monotonic and cyclic loadings for rocks and concrete. A finite element model of tool-rock frictional contact is validated by analytical results in the two asymptotic regimes of an elastoplastic rock. The mesh sensitivity is reduced using a fracture energy-based method for anisotropic damage. The tool-rock frictional contact is predominantly controlled by three dimensionless parameters: $$\eta$$ η , $$\xi$$ ξ , and $$\zeta$$ ζ , which characterize elastoplasticity, brittleness, and anisotropic damage, respectively. The newly introduced damage coefficient $$\zeta$$ ζ controls the ratio of damage in different directions. As the elastoplastic parameter $$\eta$$ η increases with more plastic deformation, the dimensionless average contact stress $${\widetilde{\Pi }}$$ Π ~ increases and then slightly varies before stabilizing. As the brittleness number $$\xi$$ ξ increases in a more brittle mode, the contact stress $${\widetilde{\Pi }}$$ Π ~ generally decreases. When the damage coefficient $$\zeta$$ ζ decreases from isotropic to anisotropic damage, the contact stress $${\widetilde{\Pi }}$$ Π ~ generally increases. The magnitudes of the average contact stress in numerical modeling are closer to experimental results when considering anisotropic damage.
Computational Modeling of Tool-Rock Frictional Contact With Anisotropic Damage
https://orcid.org/0000-0002-7965-6592
AbstractThe mechanism of frictional contact is investigated between a blunt tool and quasi-brittle rocks with anisotropic damage. A recently developed anisotropic elasto-plastic-damage model is further validated using experimental results under monotonic and cyclic loadings for rocks and concrete. A finite element model of tool-rock frictional contact is validated by analytical results in the two asymptotic regimes of an elastoplastic rock. The mesh sensitivity is reduced using a fracture energy-based method for anisotropic damage. The tool-rock frictional contact is predominantly controlled by three dimensionless parameters: $$\eta$$ η , $$\xi$$ ξ , and $$\zeta$$ ζ , which characterize elastoplasticity, brittleness, and anisotropic damage, respectively. The newly introduced damage coefficient $$\zeta$$ ζ controls the ratio of damage in different directions. As the elastoplastic parameter $$\eta$$ η increases with more plastic deformation, the dimensionless average contact stress $${\widetilde{\Pi }}$$ Π ~ increases and then slightly varies before stabilizing. As the brittleness number $$\xi$$ ξ increases in a more brittle mode, the contact stress $${\widetilde{\Pi }}$$ Π ~ generally decreases. When the damage coefficient $$\zeta$$ ζ decreases from isotropic to anisotropic damage, the contact stress $${\widetilde{\Pi }}$$ Π ~ generally increases. The magnitudes of the average contact stress in numerical modeling are closer to experimental results when considering anisotropic damage.
Computational Modeling of Tool-Rock Frictional Contact With Anisotropic Damage
https://orcid.org/0000-0002-7965-6592
AbstractThe mechanism of frictional contact is investigated between a blunt tool and quasi-brittle rocks with anisotropic damage. A recently developed anisotropic elasto-plastic-damage model is further validated using experimental results under monotonic and cyclic loadings for rocks and concrete. A finite element model of tool-rock frictional contact is validated by analytical results in the two asymptotic regimes of an elastoplastic rock. The mesh sensitivity is reduced using a fracture energy-based method for anisotropic damage. The tool-rock frictional contact is predominantly controlled by three dimensionless parameters: $$\eta$$ η , $$\xi$$ ξ , and $$\zeta$$ ζ , which characterize elastoplasticity, brittleness, and anisotropic damage, respectively. The newly introduced damage coefficient $$\zeta$$ ζ controls the ratio of damage in different directions. As the elastoplastic parameter $$\eta$$ η increases with more plastic deformation, the dimensionless average contact stress $${\widetilde{\Pi }}$$ Π ~ increases and then slightly varies before stabilizing. As the brittleness number $$\xi$$ ξ increases in a more brittle mode, the contact stress $${\widetilde{\Pi }}$$ Π ~ generally decreases. When the damage coefficient $$\zeta$$ ζ decreases from isotropic to anisotropic damage, the contact stress $${\widetilde{\Pi }}$$ Π ~ generally increases. The magnitudes of the average contact stress in numerical modeling are closer to experimental results when considering anisotropic damage.
Computational Modeling of Tool-Rock Frictional Contact With Anisotropic Damage
Rock Mech Rock Eng
Zhou, Yaneng (author) / Voyiadjis, George Z. (author)
Rock Mechanics and Rock Engineering ; 57 ; 9409-9427
2024-11-01
Article (Journal)
Electronic Resource
English
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