Application of 3-D Digital Image Correlation Technique to Study Underwater Implosion

Document Type

Conference Proceeding

Date of Original Version



A series of experiments was conducted to study the implosion of cylindrical tubes in hydrostatic environment. The implodable volumes consisted of aluminum 6061-T6 cylindrical tubing. A pressure vessel with a nominal diameter of 2.13 m was utilized to achieve the critical hydrostatic pressure required for initiating implosion. Dynamic tourmaline pressure transducers were placed in the vicinity of the implodable volume to capture the pressure histories generated during the implosion event. The real-time deformation of implodable was measured using high speed 3-D digital image correlation (DIC). Several small scale calibration experiments were conducted initially to establish the applicability of 3-D DIC for measuring the deformation of submerged objects. The results of these experiments indicated that evaluation of camera's intrinsic and extrinsic parameters with a submerged calibration grid can account for the effects of refraction due to water and the optical windows, particularly when the surface normal of the optical windows is collinear with the camera optical axis. This allows accurate reconstruction of the surface of submerged objects. The pressure histories were synchronized with high speed DIC measurements to understand the fluid-structure interaction involved in the implosion process. © The Society for Experimental Mechanics, Inc. 2015.

Publication Title

Conference Proceedings of the Society for Experimental Mechanics Series