SEDL / STP / STP1263-EB / STP16458S

Fatigue Behavior of [0]⁸ SCS-6/Ti-6Al-4V Composite Subjected to High Temperature Turboshaft Design Cycles

Aksoy, SZ
Principle Engineer, Life Structures and Dynamics, Allied Signal, Stratford, CT

Gayda, J
Research Engineer, NASA Lewis Research Center, Cleveland, Ohio

Gabb, TP
Research Engineer, NASA Lewis Research Center, Cleveland, Ohio

Pages: 14    Published: Jan 1996

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Abstract

Mission cycle fatigue testing of a [0]⁸ SCS-6/Ti-6A1-4V composite was performed. The mission cycle simulates the stress-temperature-time profile in a ring-reinforced impeller of a turboshaft engine. The cycle has a fourteen minute period and attains a peak stress and temperature of 1100 MPa and 427‡C respectively. A fatigue life of 9,528 cycles was achieved. While this life was less than the design goal, 15,000 cycles, a moderate increase in fiber content coupled with a small decrease in peak stress or temperature would probably achieve the stated design goal.