Hypervelocity Impact Damage Formation in Multilayered Transparent Target

Abstract Real-time visualization measurements of hypervelocity-impact damage evolution are performed on glass targets consisting of multiple parts stacked in the ballistic axis to evaluate the effect of the bonding interface on the formation process of impact damage. The stress field propagation and damage evolution associated with hypervelocity impact are visualized by employing the Edge-on Impact technique coupled with the polarized light shadowgraphy and scattered-light imaging method. In experiments with multilayered targets consisting only of stacked glass layers, it is observed that damage forms and propagates in the vicinity of the interface due to the interaction between the bonding interface of the glass layers and the stress wave. This indicates that the interface functions as a damage formation site. In contrast, in experiments with targets consisting of glass and polycarbonate layers, it is observed that damage propagation through the layer interface is suppressed depending on the stacking order with respect to the impact surface. These results indicate that an understanding of the interaction between stress waves and interfaces is crucial for elucidating the formation mechanism of hypervelocity impact damage. They also suggest the potential for controlling damage formation through the design of stacking structures.