Numerical modelling of heat generation during shear band formation in rock
| Autor: | Timo Saksala, Martina Pressacco, Reijo Kouhia, Sami Holopainen |
|---|---|
| Přispěvatelé: | Tampere University, Civil Engineering, Research group: Structural Mechanics, Doctoral Programme in Built Environment |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
212 Civil and construction engineering
Materials science 010504 meteorology & atmospheric sciences Viscoplasticity Continuum mechanics XIII Suomen mekaniikkapäivien 2018 erikoisnumero Mechanical Engineering Constitutive equation rock fracture Mechanics 010502 geochemistry & geophysics 01 natural sciences shear band Physics::Geophysics adiabatic heating Compressive strength Mechanics of Materials Heat generation Heat equation mechanical dissipation Adiabatic process Shear band finite element element 0105 earth and related environmental sciences |
| Zdroj: | Rakenteiden Mekaniikka |
| ISSN: | 1797-5301 0783-6104 |
| Popis: | This article gives a computational continuum mechanics answer to a question of how much heat is generated, in terms of temperature rise, during controlled shear band formation in a rock like material. This problem is treated as adiabatic heating due to mechanical dissipation at the material point level. Assuming that only the compressive strength of the rock is temperature dependent, the coupled system of the constitutive equations and the adiabatic heat equation can be solved as a second order polynomial equation for the viscoplastic multiplier at an integration point. A Mohr-Coulomb viscoplastic model with linear softening is employed for rock material description. Numerical simulations of a 2D strip under uniaxial compression at strain rates up to 10 1/s show that the temperature rise in a rock like material with a compressive strength of 100 MPa is less than two degrees. publishedVersion |
| Databáze: | OpenAIRE |
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