Journal Published Online: 01 September 1993
Volume 21, Issue 5

Mean Stress Diagrams for Composites Generated Using a Modified Up-and-Down Test Methodology: Part I—Extensive Preliminary Data



Constant-stress-amplitude axial-load fatigue tests were conducted to generate mean stress data for notched and unnotched specimens of a thermoplastic composite material with 40% (by weight) randomly oriented continuous-strand glass in a polypropylene matrix. Maximum likelihood point and interval estimates for the 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 extensive preliminary data are available to aid in test planning.

Author Information

Little, RE
The University of Michigan-Dearborn, Dearborn, MI
Pages: 7
Price: $25.00
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Stock #: JTE11780J
ISSN: 0090-3973
DOI: 10.1520/JTE11780J