Frequency and Hold-Time Effects on Low Cycle Fatigue Life of Notched Specimens at Elevated Temperature

[+] Author and Article Information
Masao Sakane, Masateru Ohnami

Department of Mechanical Engineering, Ritsumeikan University, Kyoto, 603, Japan

Teruyoshi Awaya, Nakao Shirafuji

Department of Mechanical Engineering, Maizuru Technical College, Kyoto, 603, Japan

J. Eng. Mater. Technol 111(1), 54-60 (Jan 01, 1989) (7 pages) doi:10.1115/1.3226433 History: Received December 15, 1987; Online September 15, 2009


This paper describes the frequency and hold-time effects on high temperature low cycle fatigue for round notched specimens. Unnotched and notched specimens having different elastic stress concentration factors were fatigued under triangular and trapezoidal stress waves at frequencies ranging from 5 Hz to 0.0001 Hz at 873 K. The three specific fracture characteristics were observed: cycle dependent, time dependent, and cycle-time dependent. The respective notch sensitivity occurred in the respective fracture regime. The fatigue life of notched specimens was predicted from the elastic-plastic-creep cyclic FEM analysis using the linear damage rule and the strain range partitioning rule. Both the life prediction methods predicted the creep-fatigue life within almost a factor of two scatter band.

Copyright © 1989 by ASME
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