Dynamic Behavior of Circular Tube Subjected to High-Rate Moving Internal Pressure
Koki NAGAI, Masashi DAIMARUYA and Hidetoshi KOBAYASHI
Abstract:The dynamic behavior of a circular tube subjected to high-rate moving internal pressure was examined experimentally and analyzed numerically with FEM code, LS-DYNA. The time histories of transient stress waves in both the circumferential and axial directions were observed from strain gauges pasted on the outer surface of several positions along the circular tube with a constant cross-section. Also, the time histories of high-rate moving internal pressures were measured by piezoelectric elements embedded in the inner surface layer of the circular tube. The moving internal pressure for the load conditions of the numerical analysis was based on the experimental observation and the analysis was carried out under the condition of two-dimensional model in the cylindrical coordinates. The numerical results showed comparatively good agreement with the experimental ones and the analytical model proposed in this study is effective. Additionally, the dynamic behavior of inner and outer surface of the circular tube was predicted. Key Words:Dynamic behavior, High-rate moving internal pressure, Circular tube, Transient stress, Radial displacement, FEM