Finite Element Modeling of Frictional Contact between a Blunt Tool and Rock with Anisotropic Damage

Document Type

Conference Proceeding

Publication Date

1-1-2024

Abstract

The mechanism is investigated for frictional contact between a wear flat and rocks.A brief review focuses on the governing parameters of frictional contact on different types of rocks.Anisotropic damage is taken into account using an anisotropic elasto-plastic-damage model, as demonstrated by a single-element test in uniaxial compression.Anisotropic damage is controlled by a compressive damage coefficient ζ, which can be interpreted as the ratio of axial damage to lateral damage in a special case of uniaxial compression.Tool-rock frictional contact is investigated using a finite element model consisting of a slightly inclined tool and a quasi-brittle rock with induced anisotropic damage.The nature of frictional contact is predominantly governed by three dimensionless parameters: the elastoplastic parameter η, the brittleness number ξ, and the anisotropic compressive damage coefficient ζ.The dimensionless average contact stress Πe increases with the elastoplastic parameter η, and then slightly varies before leveling off.The contact stress Πe generally decreases with an increase in the brittleness number ξ.Additionally, the contact stress Πe increases with a decrease in the damage coefficient ζ from isotropic to anisotropic damage.The numerical results of Πe are generally consistent with typical experimental results.

Publication Source (Journal or Book title)

58th US Rock Mechanics / Geomechanics Symposium 2024, ARMA 2024

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