A direct analytical methodology for the assessment of ductile fracture in metals based on multiaxial tests
The prediction accuracy of ductile damage models is subject to a sound calibration strategy, which normally involves the execution of complex multiaxial tests and requires dedicated facilities. In addition, finite element (FE) analysis is mandatory to retrieve the stress and strain states at the cri...
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| Published in | Fatigue & fracture of engineering materials & structures Vol. 47; no. 9; pp. 3408 - 3424 |
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| Main Authors | , , , |
| Format | Journal Article |
| Language | English |
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Oxford
Wiley Subscription Services, Inc
01.09.2024
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| Online Access | Get full text |
| ISSN | 8756-758X 1460-2695 |
| DOI | 10.1111/ffe.14378 |
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| Abstract | The prediction accuracy of ductile damage models is subject to a sound calibration strategy, which normally involves the execution of complex multiaxial tests and requires dedicated facilities. In addition, finite element (FE) analysis is mandatory to retrieve the stress and strain states at the critical point, which cannot be directly measured from experiments. To overcome this complexity, a minimal set of simple multiaxial tests is selected, and an analytical‐numerical approach is proposed to evaluate, without resorting to FE, both the stress evolution with plastic deformation and the fracture strain, under any different loading condition of each test. This is achieved from the sole knowledge of the material bilinear stress–strain relation and of the applied test displacement at fracture. The obtained results are compared with a traditional testing and calibration methodology, and the robustness of the approach is proved on a 17‐4PH steel, an X65 steel, and a Ti6Al4V alloy.
Highlights
Ductile damage models are calibrated by an analytical approach based on multiaxial tests.
Local stress and strain in tests can be calculated from experiments without resort to FEM.
Uniaxial and different shear‐tension stress states are investigated.
The method works on a wide range of alloys; only test displacement at failure is required. |
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| AbstractList | The prediction accuracy of ductile damage models is subject to a sound calibration strategy, which normally involves the execution of complex multiaxial tests and requires dedicated facilities. In addition, finite element (FE) analysis is mandatory to retrieve the stress and strain states at the critical point, which cannot be directly measured from experiments. To overcome this complexity, a minimal set of simple multiaxial tests is selected, and an analytical‐numerical approach is proposed to evaluate, without resorting to FE, both the stress evolution with plastic deformation and the fracture strain, under any different loading condition of each test. This is achieved from the sole knowledge of the material bilinear stress–strain relation and of the applied test displacement at fracture. The obtained results are compared with a traditional testing and calibration methodology, and the robustness of the approach is proved on a 17‐4PH steel, an X65 steel, and a Ti6Al4V alloy. The prediction accuracy of ductile damage models is subject to a sound calibration strategy, which normally involves the execution of complex multiaxial tests and requires dedicated facilities. In addition, finite element (FE) analysis is mandatory to retrieve the stress and strain states at the critical point, which cannot be directly measured from experiments. To overcome this complexity, a minimal set of simple multiaxial tests is selected, and an analytical‐numerical approach is proposed to evaluate, without resorting to FE, both the stress evolution with plastic deformation and the fracture strain, under any different loading condition of each test. This is achieved from the sole knowledge of the material bilinear stress–strain relation and of the applied test displacement at fracture. The obtained results are compared with a traditional testing and calibration methodology, and the robustness of the approach is proved on a 17‐4PH steel, an X65 steel, and a Ti6Al4V alloy. Ductile damage models are calibrated by an analytical approach based on multiaxial tests. Local stress and strain in tests can be calculated from experiments without resort to FEM. Uniaxial and different shear‐tension stress states are investigated. The method works on a wide range of alloys; only test displacement at failure is required. The prediction accuracy of ductile damage models is subject to a sound calibration strategy, which normally involves the execution of complex multiaxial tests and requires dedicated facilities. In addition, finite element (FE) analysis is mandatory to retrieve the stress and strain states at the critical point, which cannot be directly measured from experiments. To overcome this complexity, a minimal set of simple multiaxial tests is selected, and an analytical‐numerical approach is proposed to evaluate, without resorting to FE, both the stress evolution with plastic deformation and the fracture strain, under any different loading condition of each test. This is achieved from the sole knowledge of the material bilinear stress–strain relation and of the applied test displacement at fracture. The obtained results are compared with a traditional testing and calibration methodology, and the robustness of the approach is proved on a 17‐4PH steel, an X65 steel, and a Ti6Al4V alloy. Highlights Ductile damage models are calibrated by an analytical approach based on multiaxial tests. Local stress and strain in tests can be calculated from experiments without resort to FEM. Uniaxial and different shear‐tension stress states are investigated. The method works on a wide range of alloys; only test displacement at failure is required. |
| Author | Cortis, Gabriele Cortese, Luca Piacenti, Marcello Nalli, Filippo |
| Author_xml | – sequence: 1 givenname: Gabriele surname: Cortis fullname: Cortis, Gabriele email: gabriele.cortis@uniroma1.it organization: Sapienza University of Rome – sequence: 2 givenname: Marcello surname: Piacenti fullname: Piacenti, Marcello organization: Sapienza University of Rome – sequence: 3 givenname: Filippo surname: Nalli fullname: Nalli, Filippo organization: Rina Consulting – Centro Sviluppo Materiali – sequence: 4 givenname: Luca surname: Cortese fullname: Cortese, Luca organization: Sapienza University of Rome |
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| Cites_doi | 10.1016/j.engfracmech.2020.107395 10.1115/1.3225775 10.1016/0022-5096(69)90033-7 10.1115/1.3443401 10.1016/j.ijmecsci.2005.03.003 10.1016/j.mechmat.2009.11.012 10.1016/j.engfracmech.2009.02.006 10.1115/1.4030457 10.1177/1056789513485967 10.1007/BF01400222 10.1016/0022-5096(76)90024-7 10.1186/s10033‐021‐00549‐4 10.1016/j.ijsolstr.2015.02.024 10.1088/1757‐899X/1214/1/012016 10.1177/1056789515577228 10.1016/j.mechmat.2021.104173 10.1115/1.3078390 10.1016/S0013-7944(97)00074-X 10.1016/j.ijmecsci.2004.02.006 10.1115/1.3601204 10.1007/s10704-009-9422-8 10.1016/0001-6160(84)90213-X 10.1007/978‐3‐319‐21765‐9_7 10.1115/1.3443491 |
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| SubjectTerms | Calibration Complexity Critical point Damage assessment damage models calibration Ductile fracture material characterization Mathematical models multiaxial tests Plastic deformation Strain analysis Stress-strain relationships |
| Title | A direct analytical methodology for the assessment of ductile fracture in metals based on multiaxial tests |
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