Implosion of a tube within a closed tube: Experiments and computational simulations

Document Type

Conference Proceeding

Date of Original Version



A comprehensive series of experiments were conducted to study the mechanics of an implosion of a tube occurring within a closed tube. The outer tube has an inner diameter of 0.178 m (7"), a length of 1.82 m (72"), and a maximum hydrostatic pressure of 10.3 MPa (1,500 psi). The implodable volumes consist of aluminum 6061-T6 cylindrical tubing and were placed concentrically within the outer tube and equidistant from the two ends. The effect of the length to diameter (L/d) ratio on the mechanics of the implosion was investigated by varying the outer diameter of the implodable volume while holding the length constant, 0.304 mm (12"). The L/d ratios of 3, 4, 6, and 8 were utilized. The wall thicknesses of the tubes were chosen so as to obtain approximately constant collapse initiation pressures in all of the experiments. The pressure histories generated by the implosion event were captured by dynamic pressure transducers mounted on the inner surface of the outer tube. Computational models of the implosion experiments are currently being developed using the Dynamic System Mechanics Analysis Simulation (DYSMAS) software package. The computational results will be provided in the presentation. © The Society for Experimental Mechanics, Inc. 2014.

Publication Title

Conference Proceedings of the Society for Experimental Mechanics Series