Comparison of Fatigue Tests of Two Plastics, Three Composites and an Aluminum Alloy Obtained on Four Different Types of Fatigue Machines

[+] Author and Article Information
W. N. Findley

Division of Engineering, Brown University, Providence, RI

R. L. Sutherland

Department of Mechanical Engineering, University of Wyoming, Laramie, WY

J. Eng. Mater. Technol 112(1), 1-6 (Jan 01, 1990) (6 pages) doi:10.1115/1.2903181 History: Received June 01, 1988; Revised March 21, 1989; Online April 29, 2008


The results of fatigue tests of two thermoplastics (cellulose acetate and polystyrene), three composites (laminated plastics of paper, canvas, and fiberglass) and one aluminum alloy (25-ST) are reported. Four different types of fatigue machines were used to test most of the above materials. The fatigue machines were: rotating-cantilever-beam, constant-amplitude-of-deflection, and constant-amplitude-of-force, types, all of which tested specimens in bending, and a constant-amplitude-of-deflection machine which tested specimens in direct tension and compression. Results from the four machines are compared and the cause of differences is explored.

Copyright © 1990 by The American Society of Mechanical Engineers
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