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On compression and damage evolution in two thermoplastics

DOI: 10.1098/rspa.2016.0495 DOI Help

Authors: N. K. Bourne (University of Manchester) , S. C. Garcea (University of Manchester) , D. S. Eastwood (University of Manchester) , S. Parry (University of Manchester; Defence Science and Technology Organisation) , C. Rau (Diamond Light Source) , P. J. Withers (University of Manchester) , S. A. Mcdonald (University of Manchester) , E. N. Brown (Los Alamos National Laboratory)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Proceedings Of The Royal Society A: Mathematical, Physical And Engineering Science , VOL 473

State: Published (Approved)
Published: January 2017
Diamond Proposal Number(s): 12203

Open Access Open Access

Abstract: 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 three-dimensional 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.

Subject Areas: Materials

Instruments: I13-2-Diamond Manchester Imaging


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