Spallation characteristics of K9 glass with prefabricated defects

The kernel issue of spallation is the nucleation anddynamic evolution process of meso-micro damages inside materials. Usinglaser etching method, some initial inter-connected damages wereprefabricated inside K9 glass. Combining with power gun loaded plate testsand multi-point Doppler pin system (DPS) measurements, the free surfacevelocity profiles of the sample were obtained, and the dynamic real-timeevolution of internal damages inside materials was studied. From obtainedfree surface velocity profiles, some experimental phenomena were analyzed,including spallation oscillation time, unspalled signal, spallationstrength, and so on. These results can provide some novel information fordynamic damage evolution process of materials.