Compression after impact strength of a buckling resistant, tow steered panel

Andrew Rhead, Richard Butler, Wenli Liu, B C Kim, Stephen Hallett

Research output: Contribution to conferencePaper

7 Citations (Scopus)
18 Downloads (Pure)

Abstract

A novel form of fiber steering (Continuous Tow
Shearing (CTS)) which eliminates manufacturing
defects found in other steered fiber techniques, e.g.
tow-overlaps, tow gaps and tow wrinkling, has
recently been developed. By using CTS to steer
fibers in-plane, structures with improved buckling
capacity can be achieved leading to lower mass
designs. Such optimal designs for minimum mass
CTS laminates have been produced using the infinite
strip program VICONOPT. The resulting
distribution of fiber orientation and mass across the
width of these optimized laminates results in regions
of high stress near supports. These regions, which
are vital to the integrity of the CTS laminate, are at
risk of reduction in compressive strength caused by
Barely Visible Impact Damage (BVID). Hence,
using experimental tests combined with a unique
analytical approach, the paper explores the effect of
near support impact damage on the compressive
strength of CTS panels. Results indicate a failure
strain that matches industrial straight fiber
alternatives but that is below the design failure
strain. Hence there is scope for further optimization
of CTS laminates for improved damage tolerance.
Original languageEnglish
Number of pages10
Publication statusPublished - 28 Jul 2013

Fingerprint

Impact strength
Shearing
Buckling
Laminates
Fibers
Compressive strength
Damage tolerance
Fiber reinforced materials
Defects

Keywords

  • Compression after impact
  • tow-steering
  • Damage tolerance

Cite this

Compression after impact strength of a buckling resistant, tow steered panel. / Rhead, Andrew; Butler, Richard; Liu, Wenli; Kim, B C; Hallett, Stephen.

2013.

Research output: Contribution to conferencePaper

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AU - Butler, Richard

AU - Liu, Wenli

AU - Kim, B C

AU - Hallett, Stephen

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Y1 - 2013/7/28

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AB - A novel form of fiber steering (Continuous TowShearing (CTS)) which eliminates manufacturingdefects found in other steered fiber techniques, e.g.tow-overlaps, tow gaps and tow wrinkling, hasrecently been developed. By using CTS to steerfibers in-plane, structures with improved bucklingcapacity can be achieved leading to lower massdesigns. Such optimal designs for minimum massCTS laminates have been produced using the infinitestrip program VICONOPT. The resultingdistribution of fiber orientation and mass across thewidth of these optimized laminates results in regionsof high stress near supports. These regions, whichare vital to the integrity of the CTS laminate, are atrisk of reduction in compressive strength caused byBarely Visible Impact Damage (BVID). Hence,using experimental tests combined with a uniqueanalytical approach, the paper explores the effect ofnear support impact damage on the compressivestrength of CTS panels. Results indicate a failurestrain that matches industrial straight fiberalternatives but that is below the design failurestrain. Hence there is scope for further optimizationof CTS laminates for improved damage tolerance.

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