| About this Abstract |
| Meeting |
Materials Science & Technology 2011
|
| Symposium
|
Fatigue and Microstructure: A Symposium on Recent Advances
|
| Presentation Title |
Microstructure-Sensitive HCF and VHCF Simulations |
| Author(s) |
Craig Pryzybyla, Nima Salajegheh, William Musinski, David L McDowell |
| On-Site Speaker (Planned) |
David L McDowell |
| Abstract Scope |
We consider in this work how microstructure-sensitive finite element simulations can play a role in understanding effects of stress amplitude, R-ratio, and microstructure on fatigue crack formation and early growth at notches, including pores and non-metallic inclusions for Ti alloys and Ni-base superalloys. Fatigue indicator parameters (FIPs) are computed that relate to processes of fatigue crack formation and early growth at the scale of individual grains. Scatter in HCF and VHCF is computationally assessed using multiple statistical volume elements and the distribution of FIPs of extreme value character. The concepts of marked correlation functions and weighted probability density functions are introduced as a means to quantify the role of multiple microstructure attributes that couple to enhance the extreme value FIPs, and to understand surface versus subsurface transitions in the very high cycle fatigue (VHCF) regime. |
| Proceedings Inclusion? |
Definite: A CD-only volume |