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An experimental program was conducted to study the effects of foreign object damage (FOD) on the bending fatigue characteristics of a composite material, unidirectional boron/aluminum-6061. Fatigue curves were generated for a control group and each of four levels of FOD. The composite was further, characterized by static tensile and nondestructive tests. All tests were carried out at room temperature. A similar damage and fatigue experiment was done for a titanium alloy, Ti-6A1-4V, to provide baseline data with which to compare the composite. It was concluded that the composite suffers a greater percentage reduction in fatigue strength than does Ti-6A1-4V for a given impact energy.
composite materials, boron, aluminum, fatigue tests, titanium alloys, foreign object damage, ballistic impact
Captain, United States Air Force, graduate student, Air Force Institute of Technology, Wright-Patterson Air Force BaseAir Force Flight Dynamics Laboratory, Wright-Patterson Air Force Base, Dayton, Ohio