(Received 9 April 1992; accepted 23 February 1993)
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Constant-stress-amplitude axial-load fatigue tests were conducted to generate mean stress data for notched and unnotched specimens of a compression molded thermoset composite material with 27% (by weight) randomly oriented 1.0-in.- (25.4-mm) long E-glass fibers in a (Phase Alpha) polyester matrix. Maximum likelihood point and interval estimates for median fatigue strengths at 107 cycles were computed for four stress ratios R (−1.0, −0.2, +0.2, and +0.6) based on tests conducted following a modified small sample up-and-down methodology appropriate when limited preliminary data are available to aid in test planning.
Professor of Mechanical Engineering, The University of Michigan-Dearborn, Dearborn, MI
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