ISSN: 1945-7553
CODEN: JTEVAB
Page Count: 6

Low-Cycle Fatigue Analysis of Notched Members

Zhang, D
Graduate Student and Professor, University of Wisconsin, Madison, WI

Sandor, BI
Graduate Student and Professor, University of Wisconsin, Madison, WI

(Received 18 April 1998; accepted 13 December 1988)

Abstract

Low-cycle fatigue crack initiation and propagation lives of notched members are investigated. By relating N_ci(ΔJ/ψρ)^β = C_n to the Coffin-Manson equation and correlating to test results, β and C_n are found to be functions of several parameters: cyclic stress-strain constants, geometry of notch (depth and curvature), and stress ratio. (ΔJ/σ′_y) is chosen as a parameter for crack propagation in notched members. Fatigue crack initiation and propagation tests were conducted on notched plate specimens of different notch radii and stress ratios. Crack initiation life, crack propagation life, and total fatigue life are compared with the calculations. There are good correlations between the test results and the calculations.

Keywords:
low-cycle fatigue, crack initiation, crack propagation, stress intensity factor range, strain energy density

Paper ID: JTE11116J
DOI: 10.1520/JTE11116J
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