Modification of the MTS model for high strain-rate behavior of TI-6AL-4V
The Mechanical Threshold Stress (MTS) model provides excellent predictive capabilities for the material constitutive response for a wide range of temperatures and strain rates. However, the MTS model fails to capture the rapidly increasing yield stress at high strain rate behavior as the deformation...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | Materials Research Express |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/2053-1591/aced38 |
| _version_ | 1797743612294856704 |
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| author | Jason Allen Hamid Garmestani |
| author_facet | Jason Allen Hamid Garmestani |
| author_sort | Jason Allen |
| collection | DOAJ |
| description | The Mechanical Threshold Stress (MTS) model provides excellent predictive capabilities for the material constitutive response for a wide range of temperatures and strain rates. However, the MTS model fails to capture the rapidly increasing yield stress at high strain rate behavior as the deformation controlling mechanism transitions from thermal activation to drag mechanisms, only capturing the linear behavior. Further, the model typically over predicts the flow stress behavior at yield and post yield due to its use of a constant work hardening rate parameter derived from the stress–strain response at constant saturation stress. An alternative approach to fitting portions of the MTS model is investigated and mathematical models are developed to address these issues. The results show that with appropriate experimental data, the mechanical threshold stress and work hardening rate parameters within the MTS model can quite easily and accurately be modified to extend applicability to high strain rate behavior and more accurately model the initial flow stress behavior at early work hardening rates without modification of the functions core to the MTS model itself. |
| first_indexed | 2024-03-12T14:57:57Z |
| format | Article |
| id | doaj.art-d7a4ed6b2e1e425089918748392f4b63 |
| institution | Directory Open Access Journal |
| issn | 2053-1591 |
| language | English |
| last_indexed | 2024-03-12T14:57:57Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Materials Research Express |
| spelling | doaj.art-d7a4ed6b2e1e425089918748392f4b632023-08-14T11:40:44ZengIOP PublishingMaterials Research Express2053-15912023-01-0110808650410.1088/2053-1591/aced38Modification of the MTS model for high strain-rate behavior of TI-6AL-4VJason Allen0https://orcid.org/0000-0002-3649-7886Hamid Garmestani1https://orcid.org/0000-0003-1477-7585XCP-8 Verification and Analysis, Los Alamos National Laboratory, Los Alamos, NM 87545, United States of AmericaSchool of Materials Science and Engineering, Georgia Institute of Technology , Atlanta, GA 30332, United States of AmericaThe Mechanical Threshold Stress (MTS) model provides excellent predictive capabilities for the material constitutive response for a wide range of temperatures and strain rates. However, the MTS model fails to capture the rapidly increasing yield stress at high strain rate behavior as the deformation controlling mechanism transitions from thermal activation to drag mechanisms, only capturing the linear behavior. Further, the model typically over predicts the flow stress behavior at yield and post yield due to its use of a constant work hardening rate parameter derived from the stress–strain response at constant saturation stress. An alternative approach to fitting portions of the MTS model is investigated and mathematical models are developed to address these issues. The results show that with appropriate experimental data, the mechanical threshold stress and work hardening rate parameters within the MTS model can quite easily and accurately be modified to extend applicability to high strain rate behavior and more accurately model the initial flow stress behavior at early work hardening rates without modification of the functions core to the MTS model itself.https://doi.org/10.1088/2053-1591/aced38constitutive modelhigh strain-ratemechanical threshold stress model |
| spellingShingle | Jason Allen Hamid Garmestani Modification of the MTS model for high strain-rate behavior of TI-6AL-4V Materials Research Express constitutive model high strain-rate mechanical threshold stress model |
| title | Modification of the MTS model for high strain-rate behavior of TI-6AL-4V |
| title_full | Modification of the MTS model for high strain-rate behavior of TI-6AL-4V |
| title_fullStr | Modification of the MTS model for high strain-rate behavior of TI-6AL-4V |
| title_full_unstemmed | Modification of the MTS model for high strain-rate behavior of TI-6AL-4V |
| title_short | Modification of the MTS model for high strain-rate behavior of TI-6AL-4V |
| title_sort | modification of the mts model for high strain rate behavior of ti 6al 4v |
| topic | constitutive model high strain-rate mechanical threshold stress model |
| url | https://doi.org/10.1088/2053-1591/aced38 |
| work_keys_str_mv | AT jasonallen modificationofthemtsmodelforhighstrainratebehaviorofti6al4v AT hamidgarmestani modificationofthemtsmodelforhighstrainratebehaviorofti6al4v |