Random Vibration Tests for Prediction of Fatigue Life of Diffuser Structure for Gas Dynamic Laser
Final rept. 1 Jan-1 Dec 1979
AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH AIR VEHICLES DIRECTORATE
Pagination or Media Count:
Static and dynamic strain measurements which were taken during test stand operations of the gas dynamic laser GDL for the AF Airborne Laser Laboratory indicated that higher than expected vibrational stress levels may possibly limit the fatigue life of the laser structure. Particularly the diffuser sidewall structure exhibited large amplitude random vibrations which were excited by the internal gas flow. The diffuser structure consists of two layers of brazed stainless steel, AISI-347, panels. Cooling ducts were milled into the outer face sheet. These in turn are backed by the inner face sheet. So called T-rail stiffeners silverbrazed to the outer face sheets add the required stiffness and divide the sidewall into smaller rectangular plate sections.
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