Abstract
In this study, the objective was to develop, manufacture, and test hybrid nano/microcomposites with a nanoparticle reinforced matrix and demonstrate improvements to damage tolerance via Mode-II fracture toughness and impact damage absorption. The material employed was a woven carbon fiber/epoxy composite, with multi-wall carbon nanotubes as a nano-scale reinforcement to the matrix. A direct-mixing process, aided by a block copolymer dispersant and sonication, was employed to produce the nanoparticle-filled epoxy matrix. Fracture toughness was tested by several different Mode- II and mixed Mode-I/Mode-II specimens to determine the toughness improvement. Testing and material difficulties were overcome by this approach, showing a Mode-II toughness improvement of approx. 35% in the hybrid material. Impact tests were performed in a falling-weight drop tower at different energies to introduce interlaminar damage in samples of both materials. Impact damaged specimens were imaged by ultrasonic c-scans to assess the area of the damage zone at each ply interface. Post-mortem optical microscopy confirmed the interlaminar nature of the impact damage. These tests showed a consistently smaller absorbed energy and smaller total damage area for hybrid composite over reference material, translating to a nominally higher ‘effective impact toughness’ in the hybrid composite (approx 42%) regardless of specific impact energy.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 213-224 |
| Number of pages | 12 |
| Journal | Conference Proceedings of the Society for Experimental Mechanics Series |
| Volume | 8 |
| Issue number | 2016 |
| DOIs | |
| State | Published - Jan 1 2016 |
| Event | 2015 SEM Annual Conference and Exposition on Experimental and Applied Mechanics - Costa Mesa, United States Duration: Jun 8 2015 → Jun 11 2015 |
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Keywords
- Fracture toughness
- Hybrid nano/microcomposites
- Impact behavior
- Nanocomposites
- Test methods
ASJC Scopus subject areas
- Engineering(all)
- Computational Mechanics
- Mechanical Engineering
Cite this
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Fracture toughness and impact damage resistance of nanoreinforced Carbon/Epoxy composites. / Fenner, Joel S.; Daniel, Isaac M.
In: Conference Proceedings of the Society for Experimental Mechanics Series, Vol. 8, No. 2016, 01.01.2016, p. 213-224.Research output: Contribution to journal › Conference article
TY - JOUR
T1 - Fracture toughness and impact damage resistance of nanoreinforced Carbon/Epoxy composites
AU - Fenner, Joel S.
AU - Daniel, Isaac M
PY - 2016/1/1
Y1 - 2016/1/1
N2 - In this study, the objective was to develop, manufacture, and test hybrid nano/microcomposites with a nanoparticle reinforced matrix and demonstrate improvements to damage tolerance via Mode-II fracture toughness and impact damage absorption. The material employed was a woven carbon fiber/epoxy composite, with multi-wall carbon nanotubes as a nano-scale reinforcement to the matrix. A direct-mixing process, aided by a block copolymer dispersant and sonication, was employed to produce the nanoparticle-filled epoxy matrix. Fracture toughness was tested by several different Mode- II and mixed Mode-I/Mode-II specimens to determine the toughness improvement. Testing and material difficulties were overcome by this approach, showing a Mode-II toughness improvement of approx. 35% in the hybrid material. Impact tests were performed in a falling-weight drop tower at different energies to introduce interlaminar damage in samples of both materials. Impact damaged specimens were imaged by ultrasonic c-scans to assess the area of the damage zone at each ply interface. Post-mortem optical microscopy confirmed the interlaminar nature of the impact damage. These tests showed a consistently smaller absorbed energy and smaller total damage area for hybrid composite over reference material, translating to a nominally higher ‘effective impact toughness’ in the hybrid composite (approx 42%) regardless of specific impact energy.
AB - In this study, the objective was to develop, manufacture, and test hybrid nano/microcomposites with a nanoparticle reinforced matrix and demonstrate improvements to damage tolerance via Mode-II fracture toughness and impact damage absorption. The material employed was a woven carbon fiber/epoxy composite, with multi-wall carbon nanotubes as a nano-scale reinforcement to the matrix. A direct-mixing process, aided by a block copolymer dispersant and sonication, was employed to produce the nanoparticle-filled epoxy matrix. Fracture toughness was tested by several different Mode- II and mixed Mode-I/Mode-II specimens to determine the toughness improvement. Testing and material difficulties were overcome by this approach, showing a Mode-II toughness improvement of approx. 35% in the hybrid material. Impact tests were performed in a falling-weight drop tower at different energies to introduce interlaminar damage in samples of both materials. Impact damaged specimens were imaged by ultrasonic c-scans to assess the area of the damage zone at each ply interface. Post-mortem optical microscopy confirmed the interlaminar nature of the impact damage. These tests showed a consistently smaller absorbed energy and smaller total damage area for hybrid composite over reference material, translating to a nominally higher ‘effective impact toughness’ in the hybrid composite (approx 42%) regardless of specific impact energy.
KW - Fracture toughness
KW - Hybrid nano/microcomposites
KW - Impact behavior
KW - Nanocomposites
KW - Test methods
UR - http://www.scopus.com/inward/record.url?scp=85008517757&partnerID=8YFLogxK
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U2 - 10.1007/978-3-319-21611-9_27
DO - 10.1007/978-3-319-21611-9_27
M3 - Conference article
AN - SCOPUS:85008517757
VL - 8
SP - 213
EP - 224
JO - Conference Proceedings of the Society for Experimental Mechanics Series
JF - Conference Proceedings of the Society for Experimental Mechanics Series
SN - 2191-5644
IS - 2016
ER -