Abstract
A laboratory technique has been developed that permits the investigation of the structural integrity of compliant tubes. This technique involves an electrodynamic shaker and an impedance tube filled with water. Standard test procedures to check the dynamic response and fatigue life use sections of specimens and/or full-scale tubes excited by a shaker system in air. In the new technique, the test article is submerged in water and the hydrostatic pressure differential and dynamic pressures applied. This approach assures a more reliable simulation of the operational environment and provides a more accurate method of predicting the life of compliant tubes. The simulation of dynamic pressure is accomplished by driving a 12-in.-diam diaphragm with a 7800-lb shaker. Hydrostatic-pressure differential is simulated by pressurizing the compliant tube with some gaseous media. A description of the test apparatus and test results on several compliant elements are discussed.
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