A mechanism-based gradient damage model for metallic fracture
A new gradient-based formulation for predicting fracture in elastic–plastic solids is presented. Damage is captured by means of a phase field model that considers both the elastic and plastic works as driving forces for fracture. Material deformation is characterised by a mechanism-based strain grad...
| Main Authors: | , , |
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| Format: | Journal article |
| Language: | English |
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Elsevier
2021
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| _version_ | 1797112697652772864 |
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| author | Shishvan, SS Assadpour-asl, S Martinez-Paneda, E |
| author_facet | Shishvan, SS Assadpour-asl, S Martinez-Paneda, E |
| author_sort | Shishvan, SS |
| collection | OXFORD |
| description | A new gradient-based formulation for predicting fracture in elastic–plastic solids is presented. Damage is captured by means of a phase field model that considers both the elastic and plastic works as driving forces for fracture. Material deformation is characterised by a mechanism-based strain gradient constitutive model. This non-local plastic-damage formulation is numerically implemented and used to simulate fracture in several paradigmatic boundary value problems. The case studies aim at shedding light into the role of the plastic and fracture length scales. It is found that the role of plastic strain gradients is twofold. When dealing with sharp defects like cracks, plastic strain gradients elevate local stresses and facilitate fracture. However, in the presence of non-sharp defects failure is driven by the localisation of plastic flow, which is delayed due to the additional work hardening introduced by plastic strain gradients. |
| first_indexed | 2024-03-07T08:29:03Z |
| format | Journal article |
| id | oxford-uuid:5c220032-c15b-4f83-92b4-63153db8bc20 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T08:29:03Z |
| publishDate | 2021 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | oxford-uuid:5c220032-c15b-4f83-92b4-63153db8bc202024-02-28T13:31:28ZA mechanism-based gradient damage model for metallic fractureJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:5c220032-c15b-4f83-92b4-63153db8bc20EnglishSymplectic ElementsElsevier2021Shishvan, SSAssadpour-asl, SMartinez-Paneda, EA new gradient-based formulation for predicting fracture in elastic–plastic solids is presented. Damage is captured by means of a phase field model that considers both the elastic and plastic works as driving forces for fracture. Material deformation is characterised by a mechanism-based strain gradient constitutive model. This non-local plastic-damage formulation is numerically implemented and used to simulate fracture in several paradigmatic boundary value problems. The case studies aim at shedding light into the role of the plastic and fracture length scales. It is found that the role of plastic strain gradients is twofold. When dealing with sharp defects like cracks, plastic strain gradients elevate local stresses and facilitate fracture. However, in the presence of non-sharp defects failure is driven by the localisation of plastic flow, which is delayed due to the additional work hardening introduced by plastic strain gradients. |
| spellingShingle | Shishvan, SS Assadpour-asl, S Martinez-Paneda, E A mechanism-based gradient damage model for metallic fracture |
| title | A mechanism-based gradient damage model for metallic fracture |
| title_full | A mechanism-based gradient damage model for metallic fracture |
| title_fullStr | A mechanism-based gradient damage model for metallic fracture |
| title_full_unstemmed | A mechanism-based gradient damage model for metallic fracture |
| title_short | A mechanism-based gradient damage model for metallic fracture |
| title_sort | mechanism based gradient damage model for metallic fracture |
| work_keys_str_mv | AT shishvanss amechanismbasedgradientdamagemodelformetallicfracture AT assadpourasls amechanismbasedgradientdamagemodelformetallicfracture AT martinezpanedae amechanismbasedgradientdamagemodelformetallicfracture AT shishvanss mechanismbasedgradientdamagemodelformetallicfracture AT assadpourasls mechanismbasedgradientdamagemodelformetallicfracture AT martinezpanedae mechanismbasedgradientdamagemodelformetallicfracture |