In-Phase and Out-of-Phase Multiaxial Fatigue

[+] Author and Article Information
F. Ellyin, K. Golos, Z. Xia

Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2G8

J. Eng. Mater. Technol 113(1), 112-118 (Jan 01, 1991) (7 pages) doi:10.1115/1.2903365 History: Received August 01, 1989; Revised March 15, 1990; Online April 29, 2008


In this investigation, thin-walled circular cylindrical specimens fabricated from a low alloy pressure vessel steel (ASTM A-516 Gr. 70) were subjected to various multiaxial loading conditions. The tests were conducted under strain-controlled condition, and loading was provided through an axial actuator and internal and external pressure across the specimen wall. Four in-plane strain ratios (ρ = Δεt /Δεa ) were tested, and the most damaging case was the equi-biaxial in-plane straining, ρ = 1. For the latter condition, 90 deg out-of-phase loading was also investigated. These tests indicated a dramatic decrease in the number of cycles to failure, N f , as a result of out-of-phase loading. The influence of the plastic strain path on life is thus clearly demonstrated. It is shown that the total strain energy density, ΔW t = ΔW e+ + ΔW p , correlates with both the in-phase and out-of-phase cyclic tests, and therefore is a proper damage parameter to be used for life predictions. A brief description of how ΔW t can be calculated is given for the case of proportional loading. The predicted results are compared with the experimental data, and the agreement is found to be very good indeed.

Copyright © 1991 by The American Society of Mechanical Engineers
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