Senior research engineer, NASA Langly Research Center, Hampton, VA
Engineer, BASF Corporation, Charlotte, NC
Assistant professor, Texas A&M University, College Station, TX
Pages: 26 Published: Jan 1990
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
Paper ID: STP25401S