The American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessek Code (BPVC) Committee has recently developed a new Section XI (Nuclear Components Inspection) Division 2 Code named "Reliability and Integrity Management (RIM)."  RIM incorporates a new concept known as "System-Based Code (SBC)" originally due to Asada and his colleagues (2001-2004), where an integrated approach from design to service inspection is introduced using new statistical quantities known as "system reliability index," or "system co-reliability target" for any system consisting of structures and components, and "structural co-reliability," and "component co-reliability" for any structure and component, respectively.   In a recent paper published in the International Journal of Pressure Vessels and Piping (Vol. 173(2019), 79-93). Fong, Heckert, Filliben, and Freiman developed a new theory of fatigue and creep rupture life modeling for metal alloys at room and elevated temperatures such that the co-reliability of a smooth component can be estimated from fatigue and creep tupture test data with simple loading histories.  In this paper, we extend the theory to include a methodology to estimate the co-reliability of a cracked pipe from fatigue crack growth rate test data and NDE of initial crack sizing reliability data for simple loading histories.  To illustrate an application of this new modeling approach, we include two numerical examples using (a) the fatigue failure data of six AISI 4340 steel specimens at room temperature (Dowling, N. E., 1973) for a smooth steel pipe, and (b) some crack sizing reliability estimates based on ultrasonic testing data and the fatigue crack growth rate data of 17 specimens of 2024-T3 aluminum (von Euw, Hertzberg, and Roberts, 1972) for a cracked aluininum pipe.  Significance and limitations of this new fatigue life modeling approach are presented and discussed.


A Multi-Scale Failure-Probability-Based Fatigue Life Model for Estimating Component Co-Reliability of Smooth and Cracked Pipes

Division / Sponsors: 
Pressure Vessels & Piping (PVP)


Paper Proceedings: https://asmedigitalcollection.asme.org/PVP/PVP2020/volume/83815

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