The instrumented dynamic perforation test applied to a composite shell

Abstract
Perforation tests are commonly used on composites but give limited results. In this study, a single layer of a thermoplastic woven composite is tested at high velocity (45 m/s) by means of an instrumented perforation test. First, an inversed dynamic perforation tests is performed with a modified Hopkinson bar apparatus. This allows to measure accurately the perforation curve (force vs. displacement). Such a test is supplemented by the analysis of the strain displacement field measured by digital image correlation during the perforation process. This gives relevant information in case of inversed identification of several behavior parameters. This measurement technique allows to take into account the anisotropy of the material or an accurate estimation of the boundary conditions. A new experimental procedure is conducted for both quasi-static and dynamic tests. Results are presented concerning two points: the uncertainty of the measurements and the correction of boundary conditions from optical measurements.