Journal Published Online: 01 July 1995
Volume 17, Issue 3

Fatigue-Life Behavior and Matrix Fatigue Crack Spacing in Unnotched SCS-6/Timetal®21S Metal Matrix Composites

CODEN: JCTRER

Abstract

Fatigue tests of the SCS-6/Timetal®21S composite system were performed to characterize the fatigue behavior for unnotched specimens. The stress-life behavior of the unnotched [0/90]2S laminates was investigated for stress ratios of R = 0.1 and R = 0.3. No difference in fatigue lives was observed when comparing the two stress ratios on a stress-range basis. The unnotched SCS-6/Timetal 21S composites had shorter fatigue lives than those reported in the literature for the SCS-6/Ti-15-3 composites; however, the neat Timetal 21S matrix material had a longer fatigue life than those reported for the neat Ti-15-3. Multiple matrix crack initiation sites were observed throughout the composite, as well as evenly spaced transverse fatigue cracks along the length of the specimens. The spacing between fatigue cracks was investigated, as were the effects of surface cracking on composite stiffness.

Author Information

Ward, GT
Purdue University, School of Mechanical Engineering, West Lafayette, IN
Herrmann, DJ
NASA Langley Research Center, Hampton, VA
Hillberry, BM
Purdue University, School of Mechanical Engineering, West Lafayette, IN
Pages: 7
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Stock #: CTR10484J
ISSN: 0884-6804
DOI: 10.1520/CTR10484J