A dynamic investigation of observable void growth and coalescence in pure copper sheets

A combined experimental, theoretical, and numerical investigation of dynamic growth and coalescence of drilled voids in pure copper sheets was performed to visualize void growth and coalescence in a controlled matter. The dynamic constitutive model of the pure copper determined from the first tension loading in the optimized tensile split Hopkinson bar (TSHB) tests for pure copper sheets was adjusted in numerically simulating the large deformation of pure copper sheets generated by the multi-tension loading in the TSHB tests and recorded by a high speed camera. The dynamic growth, coalescence, and evolution post coalescence of drilled simplest cluster voids in pure copper sheets subjected to the multi-tension loading in the TSHB tests were recorded by the high speed camera and simulated by using the adjusted constitutive model of the pure copper and the different criteria for void coalescence. Based on Bandstra’s work [J. P. Bandstra et al. Mater. Sci. Eng. A 249, 46 (1998); J. P. Bandstra and D. A. Koss,...