2023 Fiscal Year Final Research Report
Elucidation of dwell-fatigue behavior in Ti-6Al-4V alloys by AE monitoring and Crystal plasticity simulations
Project/Area Number |
22K14139
|
Research Category |
Grant-in-Aid for Early-Career Scientists
|
Allocation Type | Multi-year Fund |
Review Section |
Basic Section 18010:Mechanics of materials and materials-related
|
Research Institution | The University of Tokyo |
Principal Investigator |
Briffod Fabien 東京大学, 大学院工学系研究科(工学部), 特任研究員 (70836890)
|
Project Period (FY) |
2022-04-01 – 2024-03-31
|
Keywords | DIC / Dwell-fatigue / Crystal plasticity / Finite Element Method / Titanium alloy |
Outline of Final Research Achievements |
The research successfully achieved the elucidation and prediction of cold dwell fatigue behavior in Ti-6Al-4V alloys from a microstructure-sensitive perspective. Through the integration of in-situ non-destructive evaluation methods (OM, AE), microstructural characterizations (SEM, EBSD), and multi-scale simulations based on crystal plasticity theory (CPFEM), a framework for real-time assessment and prediction of dwell-fatigue in Ti-6Al-4V alloy was developed. Specifically, the following tasks were addressed: 1. Statistical characterization of micro-mechanical damage mechanisms under dwell-fatigue. 2. Development of a physically based microstructure-sensitive dwell-fatigue damage model.
|
Free Research Field |
Micromechanics
|
Academic Significance and Societal Importance of the Research Achievements |
Dwell-fatigue is a critical issue in titanium Ti-6Al-4V alloy and was clarified by means of a high-resolution strain mapping approach and numerical simulations. The developed tools could be used to predict the dwell-fatigue behavior and improve the reliability of Ti alloys under dwell condition.
|