On compression and damage evolution in two thermoplastics

Neil Bourne, Serafina Garcea, David Eastwood, S Parry, Christoph Rau, Philip Withers, Samuel Mcdonald, E N Brown

    Research output: Contribution to journalArticlepeer-review


    The well-known Taylor cylinder impact test, which follows the impact of a flat-ended cylindrical rod onto a rigid stationary anvil, is conducted over a range of impact speeds for two polymers, polytetrafluoroethylene (PTFE) and polyetheretherketone (PEEK). In previous work, experiments and a model were developed to capture the deformation behaviour of the cylinder after impact. These works showed a region in which spatial and temporal variation of both longitudinal and radial deformation provided evidence of changes in phase within the material. In this further series of experiments, this region is imaged in a range of impacted targets at the Diamond synchrotron. Further techniques were fielded to resolve compressed regions within the recovered polymer cylinders that showed a fracture zone in the impact region. The combination of macroscopic high speed photography and 3D X-ray imaging has identified the development of failure with these polymers and shown that there is no abrupt transition in behaviours but rather a continuous range of responses to competing operating mechanisms. The behaviours noted in PEEK in these polymers show critical gaps in understanding of polymer high strain-rate response.
    Original languageEnglish
    JournalProceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
    Early online date18 Jan 2017
    Publication statusPublished - 2017


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