A MICROSTRUCTURE-INFORMED AND STATISTICAL ANALYSIS OF PLASTICITY AND FATIGUE CRACK NUCLEATION AND PROPAGATION
Abstract
A challenge in predicting material degradation and structural damage tolerance under fatigue loading of ductile metals commonly used in Army vehicles, weapons, and structure in general is the lack of an efficient and physics based prediction capability to model crack formation and growth in the short crack regime. Given that this short crack regime encompasses up to 80% of fatigue life, many current design practices involve extensive mechanical testing and/or result in design conservatism. To meet the DEPSCoR goal to advance knowledge in basic science involving bold and ambitious research, this proposed research aims to formulate a physics-based statistical volume element model and analysis method to predict, investigate, and non-deterministically quantify crack nucleation and short crack growth and to determine effective properties that are directly related to the materials non-deterministic microstructure for input to meso- and macroscale structural analysis models for damage tolerance assessment. The approach is based on state-of-the-art stochastic grain scale modeling, crystal plasticity material behavior, and fatigue indicator parameters calculation for driving forces that is validated using the results of focused experimental testing and imaging. The novelties in computational modeling, including efficient advance of the solution in time to greatly reduce computational demand, finds application in the fatigue response of a variety of ductile and brittle materials used in defense, transportation, and energy applications. The additional DEPSCoR goals will be achieved through the professional development of the applicant in DoD culture, research, and applications through mentorship by the collaborator who has 12 years of DoD experience in industry and 10 years of DoD academic research experience. The collaboration between these two researchers with complimentary expertise will build a strong foundation for continuing DoD research at the University of Tennessee while preparing the future DoD workforce through student education and research participation.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Apr 20, 2023
- Source ID
- FA95502210359
Entities
People
- Reza Abedi
Organizations
- Air Force Office of Scientific Research
- United States Air Force
- University of Tennessee