Journal Published Online: 30 September 2019
Volume 48, Issue 1

Fatigue of Tungsten Fiber/Copper Matrix Composite—An Interlaboratory Study

CODEN: JTEVAB

Abstract

Seven laboratories participated in an interlaboratory study to assess the applicability of ASTM E606, Test Method for Strain-Controlled Fatigue Testing, to strain-controlled fatigue of a tungsten fiber/copper matrix composite (Battelle Columbus, University of Iowa, IITRI, MCL, MarTest, Rockwell International Science Center and University of Twente). Because of the material and specimen fabrication methods, the number of fibers in the 9, 25, and 36 % fiber volume fraction specimens is approximately the same and the strain-life data are nearly identical for each of the volume fractions. Although the specimen aspect ratio is within the nominal range, the specimen diameter is less than the nominal value specified in ASTM E606. Laboratories reporting data noted that a small specimen diameter and a large gage section aspect ratio made specimen alignment difficult. Thus, specimen buckling was problematic at high strain ranges. The study data are reported and analyzed with nonparametric and semiparametric statistical methods to assess the effect of study covariates on fatigue life. The median fatigue life, median absolute deviation from the median, and interquartile range are reported as measures of central tendency and variability. ASTM E606 may be used as a guide to evaluate the fatigue response of this type of composite material if the length-to-diameter aspect ratio, specimen alignment in the fatigue machine, and specimen surface finish are closely monitored to ensure valid data.

Author Information

Jerina, K. L.
Department of Mechanical Engineering, Washington University, St. Louis, MO, USA
Mitchell, M. R.
Mechanics and Materials Consulting, Flagstaff, AZ, USA
Pages: 14
Price: $25.00
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Details
Stock #: JTE20190322
ISSN: 0090-3973
DOI: 10.1520/JTE20190322