Fracture of Titanium Alloys at High Strain Rates and under Stress Triaxiality
The present study investigates the effect of stress triaxiality on mechanical behavior and fracture of Ti-5Al-2.5Sn alloy in a practical relevant strain rate range from 0.1 to 1000 s<sup>−1</sup>. Tensile tests were carried out on flat smoothed and notched specimens using an In...
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MDPI AG
2020-02-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/10/3/305 |
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| author | Vladimir V. Skripnyak Evgeniya G. Skripnyak Vladimir A. Skripnyak |
| author_facet | Vladimir V. Skripnyak Evgeniya G. Skripnyak Vladimir A. Skripnyak |
| author_sort | Vladimir V. Skripnyak |
| collection | DOAJ |
| description | The present study investigates the effect of stress triaxiality on mechanical behavior and fracture of Ti-5Al-2.5Sn alloy in a practical relevant strain rate range from 0.1 to 1000 s<sup>−1</sup>. Tensile tests were carried out on flat smoothed and notched specimens using an Instron VHS 40/50-20 servo-hydraulic test machine. High-speed video registration was conducted by Phantom 711 Camera. Strain fields on the specimen gauge area were investigated by the digital image correlation method (DIC). The fracture surface relief was studied using digital microscope Keyence VHX-600D. Stress and strain fields during testing of the Ti-5Al-2.5Sn alloy were analyzed by the numerical simulation method. The evolution of strain fields at the investigated loading condition indicates that large plastic deformation occurs in localization bands. The alloy undergoes fracture governing by damage nucleation, growth, and coalescence in the localized plastic strain bands oriented along the maximum shear stresses. Results confirm that the fracture of near alpha titanium alloys has ductile behavior at strain rates from 0.1 to 1000 s<sup>−1</sup>, stress triaxiality parameter 0.33 < <i>η</i> < 0.6, and temperature close to 295 K. |
| first_indexed | 2024-12-10T06:45:55Z |
| format | Article |
| id | doaj.art-062a0f7edeb84b4a84a27544ab10911d |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-12-10T06:45:55Z |
| publishDate | 2020-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-062a0f7edeb84b4a84a27544ab10911d2022-12-22T01:58:39ZengMDPI AGMetals2075-47012020-02-0110330510.3390/met10030305met10030305Fracture of Titanium Alloys at High Strain Rates and under Stress TriaxialityVladimir V. Skripnyak0Evgeniya G. Skripnyak1Vladimir A. Skripnyak2Department of Deformable Solid Body Mechanics, National Research Tomsk State University, 634050 Tomsk, RussiaDepartment of Deformable Solid Body Mechanics, National Research Tomsk State University, 634050 Tomsk, RussiaDepartment of Deformable Solid Body Mechanics, National Research Tomsk State University, 634050 Tomsk, RussiaThe present study investigates the effect of stress triaxiality on mechanical behavior and fracture of Ti-5Al-2.5Sn alloy in a practical relevant strain rate range from 0.1 to 1000 s<sup>−1</sup>. Tensile tests were carried out on flat smoothed and notched specimens using an Instron VHS 40/50-20 servo-hydraulic test machine. High-speed video registration was conducted by Phantom 711 Camera. Strain fields on the specimen gauge area were investigated by the digital image correlation method (DIC). The fracture surface relief was studied using digital microscope Keyence VHX-600D. Stress and strain fields during testing of the Ti-5Al-2.5Sn alloy were analyzed by the numerical simulation method. The evolution of strain fields at the investigated loading condition indicates that large plastic deformation occurs in localization bands. The alloy undergoes fracture governing by damage nucleation, growth, and coalescence in the localized plastic strain bands oriented along the maximum shear stresses. Results confirm that the fracture of near alpha titanium alloys has ductile behavior at strain rates from 0.1 to 1000 s<sup>−1</sup>, stress triaxiality parameter 0.33 < <i>η</i> < 0.6, and temperature close to 295 K.https://www.mdpi.com/2075-4701/10/3/305stress triaxialitynotched specimendamage evolutiontitanium alloyshigh strain rate |
| spellingShingle | Vladimir V. Skripnyak Evgeniya G. Skripnyak Vladimir A. Skripnyak Fracture of Titanium Alloys at High Strain Rates and under Stress Triaxiality Metals stress triaxiality notched specimen damage evolution titanium alloys high strain rate |
| title | Fracture of Titanium Alloys at High Strain Rates and under Stress Triaxiality |
| title_full | Fracture of Titanium Alloys at High Strain Rates and under Stress Triaxiality |
| title_fullStr | Fracture of Titanium Alloys at High Strain Rates and under Stress Triaxiality |
| title_full_unstemmed | Fracture of Titanium Alloys at High Strain Rates and under Stress Triaxiality |
| title_short | Fracture of Titanium Alloys at High Strain Rates and under Stress Triaxiality |
| title_sort | fracture of titanium alloys at high strain rates and under stress triaxiality |
| topic | stress triaxiality notched specimen damage evolution titanium alloys high strain rate |
| url | https://www.mdpi.com/2075-4701/10/3/305 |
| work_keys_str_mv | AT vladimirvskripnyak fractureoftitaniumalloysathighstrainratesandunderstresstriaxiality AT evgeniyagskripnyak fractureoftitaniumalloysathighstrainratesandunderstresstriaxiality AT vladimiraskripnyak fractureoftitaniumalloysathighstrainratesandunderstresstriaxiality |