scholarly journals Increasing carbon fiber composite strength with a nanostructured “brick-and-mortar” interphase

2018 ◽  
Vol 5 (4) ◽  
pp. 668-674 ◽  
Author(s):  
Francois De Luca ◽  
Adam J. Clancy ◽  
Noelia R. Carrero ◽  
David B. Anthony ◽  
Hugo G. De Luca ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Fiber Composite ◽  
Carbon Fibres ◽  
Carbon Fiber Composite ◽  
Composite Strength ◽  
Composite Failure ◽  
Brick And Mortar ◽  
Fiber Breaks

Sudden composite failure under tension can be delayed by a highly ordered nanostructured multilayered nacre mimetic interface applied to carbon fibres by isolating fiber breaks within the composite.

Intrinsic Mechanisms Limiting the Use of Carbon Fiber Composite Pressure Vessels

2016 ◽  
Vol 138 (6) ◽  
Author(s):  
Alain Thionnet ◽  
Anthony Bunsell ◽  
Heng-Yi Chou
Keyword(s):  
Carbon Fiber ◽  
Fiber Composite ◽  
Pressure Vessels ◽  
Load Level ◽  
Carbon Fiber Composite ◽  
Fiber Failure ◽  
Intrinsic Nature ◽  
Composite Failure ◽  
Fiber Breaks ◽  
Composite Pressure Vessels

The viscoelastic properties of the resins used in carbon fiber composite pressure vessels introduce time effects which allow damage processes to develop during use under load. A detailed understanding of these processes has been achieved through both experimental and theoretical studies on flat unidirectional specimens and with comparisons with the behavior of pressure vessels. Under steady pressures, the relaxation of the resin in the vicinity of earlier fiber breaks gradually increases the sustained stress in neighboring intact fibers and some eventually break. The rate of fiber failure has been modeled based only on physical criteria and shown to accurately predict fiber failure leading to composite failure, as seen in earlier studies. Under monotonic loading, failure is seen to be initiated when the earlier random nature of breaks changes so as to produce clusters of fiber breaks. Under steady loading, at loads less than that producing monotonic failure, greater damage can be sustained without immediately inducing composite failure. However, if the load level is high enough failure does eventually occur. It has been shown, however, that below a certain load level the probability of failure reduces asymptotically to zero. This allows a minimum safety factor to be quantitatively determined taking into account the intrinsic nature of the composite although other factors such as accidental damage or manufacturing variations need to be assessed before such a factor can be proposed as standards for pressure vessels.

Prestressed Carbon Fiber Composite Overwrapped Gun Tube

2008 ◽  
Author(s):  
Andrew Littlefield ◽  
Edward Hyland ◽  
Jack Keating
Keyword(s):  
Carbon Fiber ◽  
Fiber Composite ◽  
Carbon Fiber Composite

scholarly journals Lightweight Cellulose/Carbon Fiber Composite Foam for Electromagnetic Interference (EMI) Shielding

Polymers ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 1319 ◽  
Author(s):  
Ran Li ◽  
Huiping Lin ◽  
Piao Lan ◽  
Jie Gao ◽  
Yan Huang ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Carbon Fibers ◽  
Electromagnetic Interference ◽  
Fiber Composite ◽  
Carbon Fiber Composites ◽  
Shielding Effectiveness ◽  
Electromagnetic Interference Shielding ◽  
Carbon Fiber Composite ◽  
Foaming Process ◽  
Long Carbon Fibers

Lightweight electromagnetic interference shielding cellulose foam/carbon fiber composites were prepared by blending cellulose foam solution with carbon fibers and then freeze drying. Two kinds of carbon fiber (diameter of 7 μm) with different lengths were used, short carbon fibers (SCF, L/D = 100) and long carbon fibers (LCF, L/D = 300). It was observed that SCFs and LCFs built efficient network structures during the foaming process. Furthermore, the foaming process significantly increased the specific electromagnetic interference shielding effectiveness from 10 to 60 dB. In addition, cellulose/carbon fiber composite foams possessed good mechanical properties and low thermal conductivity of 0.021–0.046 W/(m·K).

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