SYMPOSIA PAPER Published: 01 January 1990

Mechanical Characterization of Unnotched SCS /Ti-15-3 Metal Matrix Composites at Room Temperature


The Ti-15-3 metal matrix composites containing silicon carbide (SCS6) fibers, in five different lay-ups, have been tested at room temperature to determine static strengths and mechanical properties. Experimental data and predicted values of the laminate properties and strengths showed good correlation. The off-axis laminate plies (that is 90° and 45°) suffered fiber/matrix interface failures at stress levels as low as 20 ksi, thus significantly affecting the mechanical properties of the laminate. Edge replicas were used to verify the fiber/matrix separations. Microscopic examinations determined that the fiber/matrix failures were occurring in the titanium/silicon reaction layer. Fatigue tests were performed on unnotched specimens to determine the number of cycles to failure versus cyclic stress level. It was found that the stress in the 0° fiber could be used to correlate the fatigue life of different laminates containing 0° phes.

Author Information

Johnson, WS
NASA Langly Research Center, Hampton, VA
Lubowinski, SJ
BASF Corporation, Charlotte, NC
Highsmith, AL
Texas A&M University, College Station, TX
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Developed by Committee: D30
Pages: 193–218
DOI: 10.1520/STP25401S
ISBN-EB: 978-0-8031-5138-3
ISBN-13: 978-0-8031-1385-5