Abstract: For aviation vehicles the reliability of hydraulic tube system is so important that any damage of the tube may causes catastrophe in flight. Flexure vibration test of hydraulic tubes is necessary to ensure the reliability and to reduce the weight. Comparing with the several test methods in International Organiztion For Standardization (ISO) and Military Specification of U.S. A, the paper discusses and complements the cantilever beam method and the simple beam method for flexure vibration tests of aviation tubes. The contents in the paper include estimating the length of the test specimen) transforming static strain to stress due to oil pressure, the method of strain control or stress control, the error due to diametral size of specimen and the effects due to size and positions of strain gages.

Key words: hydraulic tube, flexure vibration, cantilever beam, strain gages