Oblique ballistic impact testing of carbon/epoxy torsion tubes

Aniruddh Vashisth, Todd C. Henry, Brent T. Mills, Joseph Lee, Charles E. Bakis

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Experimental research has shown that the incorporation of nanosilica (NS) filler in carbon/epoxy (c/ep) cylindrical tubes decreases the damaged area and increases the residual torsional strength of following normal incidence ballistic impact. The current investigation aims to determine the effect of NS on the residual torsional strength (RTS) of c/ep cylindrical tubes subjected to a static torsional load during oblique-incidence ballistic impact, where the projectile grazes the outer radius of the tube at a 45° angle in order to remove the largest amount of material (slashing impact). A total of four tubes were evaluated—two with 15% NS as a percent of matrix weight and two without NS filler. One of the impact tests resulted in two distinct holes in the tube rather than an elliptical gouged-out area, resulting in a reduced overall damage area and less degraded RTS versus the properly impacted tubes. The RTS retention of the three tubes having the intended impact trajectory was approximately 12% of the estimated strength of undamaged tubes. Likewise, the size of the damage zone surrounding the impact site, determined by coin-tapping, was also similar among the properly impacted tubes. Overall, the results are comparable with previously published slashing impact data for carbon fiber composite tubes made with various matrix materials and highlight the dominant influence of fiber damage versus matrix damage on the RTS of composite tubes following slashing ballistic impact.

Original languageEnglish (US)
Title of host publicationProceedings of the American Society for Composites - 34th Technical Conference, ASC 2019
EditorsKyriaki Kalaitzidou
PublisherDEStech Publications
ISBN (Electronic)9781605956022
StatePublished - Jan 1 2019
Event34th Technical Conference of the American Society for Composites, ASC 2019 - Atlanta, United States
Duration: Sep 23 2019Sep 25 2019

Publication series

NameProceedings of the American Society for Composites - 34th Technical Conference, ASC 2019

Conference

Conference34th Technical Conference of the American Society for Composites, ASC 2019
CountryUnited States
CityAtlanta
Period9/23/199/25/19

All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films
  • Mechanics of Materials
  • Metals and Alloys

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  • Cite this

    Vashisth, A., Henry, T. C., Mills, B. T., Lee, J., & Bakis, C. E. (2019). Oblique ballistic impact testing of carbon/epoxy torsion tubes. In K. Kalaitzidou (Ed.), Proceedings of the American Society for Composites - 34th Technical Conference, ASC 2019 (Proceedings of the American Society for Composites - 34th Technical Conference, ASC 2019). DEStech Publications.