| About this Abstract |
| Meeting |
2024 ASC Technical Conference, US-Japan Joint Symposium, D30 Meeting
|
| Symposium
|
2024 ASC Technical Conference, US-Japan Joint Symposium, D30 Meeting
|
| Presentation Title |
Fatigue-Life Prediction and Design for Uncracked and Cracked Components: Determinstic, A- and B-Basis Probabilistic, or Reliabilty Target Approach |
| Author(s) |
Jeffrey T Fong, Md Rassel Raihan |
| On-Site Speaker (Planned) |
Jeffrey T Fong |
| Abstract Scope |
Based on a recently developed multi-scale fatigue-fracture-NDE reliability model for uncracked and small-cracked pipes (Fong-Marcal-Rainsberger-Heckert-Filliben-Doctor-Finney, PVP2021-62169), we apply the same modeling technique to a comparative study of three approaches in fatigue-life prediction and design, namely,
Approach (1) Deterministic,
Approach (2) Probabilistic with the use of the A- and B-basis design allowables, and
Approach (3) Reliability Target using the concept of an upper bound of failure probability as a tool for damage assessment and control.
To illustrate the comparison of the three approaches to both uncracked and small-cracked components, we present numerical examples for generic components of four engineering materials at room temperatures, namely,
(a) AISI 4340 steel,
(b) 2024-T4 aluminum,
(c) Composite laminate Sample 1832-8 (after Boller, 1969 ASTM STP 460, pp. 217-235), and
(d) BK-7 borosilicate crown glass for aircraft windows.
In particular, for small-cracked components inspected by NDE personnel with varying probability of detection (POD) qualifications, we find both Approach (1) and Approach (2) inadequate as a guide for maintenance decision-making and compliance with the ASME Boiler and Pressure Vessel Section XI Division 2 Reliability and Integrity Management (RIM) Code.
Significance and limitations of the methodology for Approach (3) based on the concepts of reliability lower bound and reliability target are presented and discussed. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |