Off-axis compression behaviour of honeycomb core in WT-plane

The applicability of honeycomb cores for energy absorption is dictated by their sensitivity to compression-dominated combined loading, especially at dynamic rates. In the present study, a combined loading state has been achieved using off-axis compression specimens. The effects of off-axis angle, test speed and core thickness on the crush initiation strength, average crush stress and failure modes in Nomex honeycomb cores have been studied experimentally. The compression tests on end-stabilised honeycomb specimens with off-axis angles of 0°, 5°, 15°, 30° and 45° in the WT-plane were conducted at stroke rates of 2.12 × 10 supra -5, 0.0254 and 0.254 m/s. It was observed from the test data that the crush initiation load and crush stress increase with test speed but decrease as off-axis angle is increased. A smoother transition from the initial linear-elastic region to the crush region was observed with increasing off-axis angles. Buckling-initiated cell wall folding mechanism was prevalent in specimens with off-axis angles less than 30°, while cell collapse prevailed at higher off-axis angles. The results indicate that the off-axis loading must be limited to utilise the energy absorption capability of the cell wall material.

• Record URL:
  • http://www.informaworld.com/10.1080/13588260802614373
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/13588265
• Supplemental Notes:
  • Abstract reprinted with permission from Taylor & Francis
• Authors:
  • Keshavanarayana, Suresh
  • Thotakuri, Manoj Varma
• Publication Date: 2009

Language

• English

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 173-181
• Serial:
  • International Journal of Crashworthiness
  • Volume: 14
  • Issue Number: 2
  • Publisher: Taylor & Francis
  • ISSN: 1358-8265
  • Serial URL: http://www.tandfonline.com/loi/tcrs20

Subject/Index Terms

• TRT Terms: Axis; Cellular structures; Compression; Compressive strength; Energy absorption; Honeycomb structures; Loads
• Uncontrolled Terms: Angles; Crush analysis
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 01137393
• Record Type: Publication
• Files: TRIS
• Created Date: Jul 30 2009 1:48PM