About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Advances in Titanium Technology
|
| Presentation Title |
Probabilistic Dwell Fatigue Life Prediction of Microtextured Ti-6Al-4V |
| Author(s) |
Sushant K. Jha, Adam L Pilchak, James M Larsen, Patrick J Golden, Reji John |
| On-Site Speaker (Planned) |
Sushant K. Jha |
| Abstract Scope |
Near-alpha and alpha+beta titanium alloys exhibit significant debit in life under dwell fatigue loading compared to cyclic fatigue when containing microtextured regions (MTRs). The debit in life has been attributed to both early initiation as well as faster small-crack growth through suitably oriented MTRs, via a faceted crack growth mechanism. From component lifing perspective, the effect of MTR on minimum dwell fatigue life is traditionally accounted for by use of knock-down factors that are often based on empirical methods. In this presentation, a probabilistic model that captures the effect of spatial distribution of MTRs on the small-crack growth behavior and distribution in dwell fatigue life will be discussed. This modeling approach attempts to directly account for the effects of MTR variables and also the loading, stress gradient, and surface treatment variables on minimum life. The sensitivity of model predictions to these variables will also be discussed. |