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- Publisher Website: 10.1016/j.cma.2017.10.009
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Article: Coupled phase-field and plasticity modeling of geological materials: From brittle fracture to ductile flow
Title | Coupled phase-field and plasticity modeling of geological materials: From brittle fracture to ductile flow |
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Authors | |
Keywords | Fracture Brittleâ ductile transition Strain localization Plasticity Phase field Geomaterials |
Issue Date | 2018 |
Citation | Computer Methods in Applied Mechanics and Engineering, 2018, v. 330, p. 1-32 How to Cite? |
Abstract | © 2017 Elsevier B.V. The failure behavior of geological materials depends heavily on confining pressure and strain rate. Under a relatively low confining pressure, these materials tend to fail by brittle, localized fracture, but as the confining pressure increases, they show a growing propensity for ductile, diffuse failure accompanying plastic flow. Furthermore, the rate of deformation often exerts control on the brittleness. Here we develop a theoretical and computational modeling framework that encapsulates this variety of failure modes and their brittleâ ductile transition. The framework couples a pressure-sensitive plasticity model with a phase-field approach to fracture which can simulate complex fracture propagation without tracking its geometry. We derive a phase-field formulation for fracture in elasticâ plastic materials as a balance law of microforce, in a new way that honors the dissipative nature of the fracturing processes. For physically meaningful and numerically robust incorporation of plasticity into the phase-field model, we introduce several new ideas including the use of phase-field effective stress for plasticity, and the dilative/compactive split and rate-dependent storage of plastic work. We construct a particular class of the framework by employing a Druckerâ Prager plasticity model with a compression cap, and demonstrate that the proposed framework can capture brittle fracture, ductile flow, and their transition due to confining pressure and strain rate. |
Persistent Identifier | http://hdl.handle.net/10722/250888 |
ISSN | 2023 Impact Factor: 6.9 2023 SCImago Journal Rankings: 2.397 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Choo, Jinhyun | - |
dc.contributor.author | Sun, Wai Ching | - |
dc.date.accessioned | 2018-02-01T01:53:59Z | - |
dc.date.available | 2018-02-01T01:53:59Z | - |
dc.date.issued | 2018 | - |
dc.identifier.citation | Computer Methods in Applied Mechanics and Engineering, 2018, v. 330, p. 1-32 | - |
dc.identifier.issn | 0045-7825 | - |
dc.identifier.uri | http://hdl.handle.net/10722/250888 | - |
dc.description.abstract | © 2017 Elsevier B.V. The failure behavior of geological materials depends heavily on confining pressure and strain rate. Under a relatively low confining pressure, these materials tend to fail by brittle, localized fracture, but as the confining pressure increases, they show a growing propensity for ductile, diffuse failure accompanying plastic flow. Furthermore, the rate of deformation often exerts control on the brittleness. Here we develop a theoretical and computational modeling framework that encapsulates this variety of failure modes and their brittleâ ductile transition. The framework couples a pressure-sensitive plasticity model with a phase-field approach to fracture which can simulate complex fracture propagation without tracking its geometry. We derive a phase-field formulation for fracture in elasticâ plastic materials as a balance law of microforce, in a new way that honors the dissipative nature of the fracturing processes. For physically meaningful and numerically robust incorporation of plasticity into the phase-field model, we introduce several new ideas including the use of phase-field effective stress for plasticity, and the dilative/compactive split and rate-dependent storage of plastic work. We construct a particular class of the framework by employing a Druckerâ Prager plasticity model with a compression cap, and demonstrate that the proposed framework can capture brittle fracture, ductile flow, and their transition due to confining pressure and strain rate. | - |
dc.language | eng | - |
dc.relation.ispartof | Computer Methods in Applied Mechanics and Engineering | - |
dc.subject | Fracture | - |
dc.subject | Brittleâ ductile transition | - |
dc.subject | Strain localization | - |
dc.subject | Plasticity | - |
dc.subject | Phase field | - |
dc.subject | Geomaterials | - |
dc.title | Coupled phase-field and plasticity modeling of geological materials: From brittle fracture to ductile flow | - |
dc.type | Article | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1016/j.cma.2017.10.009 | - |
dc.identifier.scopus | eid_2-s2.0-85034091680 | - |
dc.identifier.hkuros | 286102 | - |
dc.identifier.volume | 330 | - |
dc.identifier.spage | 1 | - |
dc.identifier.epage | 32 | - |
dc.identifier.isi | WOS:000425735700001 | - |
dc.identifier.issnl | 0045-7825 | - |