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Dramatic Increase in Fatigue Life in Hierarchical Graphene Composites
被引:196
作者:
Yavari, F.
Rafiee, M. A.
Rafiee, J.
Yu, Z. -Z.
[1
]
Koratkar, N.
机构:
[1] Rensselaer Polytech Inst, Dept Mech Aerosp & Nucl Engn, Troy, NY 12180 USA
基金:
美国国家科学基金会;
关键词:
graphene;
carbon nanotubes;
hierarchical nanocomposites;
fatigue life;
FUNCTIONALIZED GRAPHENE;
TOUGHENING MECHANISMS;
EPOXY NANOCOMPOSITES;
FRACTURE;
MATRIX;
GRAPHITE;
POLYMERS;
SHEETS;
FILMS;
OXIDE;
D O I:
10.1021/am100728r
中图分类号:
TB3 [工程材料学];
学科分类号:
0805 ;
080502 ;
摘要:
We report the synthesis and fatigue characterization of fiberglass/epoxy composites with various weight fractions of graphene platelets infiltrated into the epoxy resin as well as directly spray-coated on to the glass microfibers. Remarkably only similar to 0.2% (with respect to the epoxy resin weight and similar to 0.02% with respect to the entire laminate weight) of graphene additives enhanced the fatigue life of the composite in the flexural bending mode by up to 1200-fold. By contrast, under uniaxial tensile fatigue conditions, the graphene fillers resulted in similar to 3-5-fold increase in fatigue life. The fatigue life increase (in the flexural bending mode) with graphene additives was similar to 1-2 orders of magnitude superior to those obtained using carbon nanotubes. In situ ultrasound analysis of the nanocomposite during the cyclic fatigue test suggests that the graphene network toughens the fiberglass/epoxy-matrix interface and prevents the delamination/buckling of the glass microfibers under compressive stress. Such fatigue-resistant hierarchical materials show potential to improve the safety, reliability, and cost effectiveness of fiber-reinforced composites that are increasingly the material of choice in the aerospace, automotive, marine, sports, biomedical, and wind energy industries.
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页码:2738 / 2743
页数:6
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