High-Frequency Axial Fatigue Test Procedures for Spectrum Loading
NAVAL AIR WARFARE CENTER AIRCRAFT DIV PATUXENT RIVER MD PATUXENT RIVER United States
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This Memorandum documents the procedures for conducting an axial fatigue test under variable amplitude spectrum loading conditions using an MTS 810 High-Frequency Test frame. Load-controlled fatigue testing under repeating block, variable amplitude loading histories can be performed at frequencies much higher than standard servo-hydraulic test frames by using a test frame that is optimized to run at higher frequencies. AIR 4.3 has conducted a research program to develop a test capability for performing such tests, using an existing MTS 810 test frame operated in servo-hydraulic mode. The test frame configuration was modified to maximize controller response during variable amplitude loading, and a closed-loop digital test frame controller with a command feedback compensation scheme was used to minimize controller error during testing.
- Military Aircraft Operations