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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.
titanium, metal matrix composites, silicon-carbide fibers, static strength, interfacial failures, laminate analysis, residual thermal stresses, mechanical properties, composite materials, thermal properties, mechanical properties
Senior research engineer, NASA Langly Research Center, Hampton, VA
Engineer, BASF Corporation, Charlotte, NC
Assistant professor, Texas A&M University, College Station, TX