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Structure of Carbon Fiber Reinforced Polymer
Transcript of Structure of Carbon Fiber Reinforced Polymer
Callister, W. and Rethwisch, D. (2010) Materials Science and Engineering: An Introduction. 8th ed. Hoboken: John Wiley & Sons, Inc., p.646-649.
Chung, D. (1994) Carbon Fiber Composites. [e-book] Newton: Butterworth-Heinemann. p.3-11, 55-64. Available through: Knovel http://www.knovel.com.ezproxy2.library.usyd.edu.au/web/portal/browse/display?_EXT_KNOVEL_DISPLAY_bookid=517 [Accessed: 14th April, 2013].
Organic Chemistry at UCLA (2001) Hybrid Orbitals. [online] Available at: http://www.chem.ucla.edu/harding/notes/hybridorbitals_01.pdf [Accessed: 14th April, 2013].
General Chemistry at Penn State (2010) Bond Types. [online] Available at: http://courses.chem.psu.edu/chem110/spring/VanDerSluys/19%20Bond%20Types.pdf [Accessed: 14th April, 2013]. References Heat Treatment at 2500°C Heat Treatment at 2000°C Fiber Axis Heat Treatment at 1000°C Effect of Heat Treatment on Degree of Alignment of Carbon Layers http://chemwiki.ucdavis.edu/@api/deki/files/2472/=sp2.png Carbon Fiber Reinforcements Resin Matrix Composite structure
Matrix – Resin
Reinforcement – Carbon Fibers
Pitch Macro Structure Structure of Carbon Fiber Reinforced Polymer Structural features lead to highly desirable mechanical properties
Strong in-plane bonding (hybridised covalent and π-bonds)
Degree of alignment of carbon layers to fiber axis (fiber texture)
Turbostratic regions and graphitic regions with AB layer packing sequence
Spacing between layers Structure and Properties “Carbon fiber composites” – D. L. Chung Carbon fibers are polycrystalline
Three crystal types of carbon fiber exist:
Graphite regions with AB sequence layer packing
Crystalline regions with no layer packing sequence – turbostratic structure
Amorphous regions – no parallel alignment of layers Crystal Structure Micro Structure Main constituent element of fibers is Carbon
Covalent bonding between sp2 hybridised orbitals
Metallic bonding between delocalised p orbitals
Van der Waals bonding between layers
Differing strengths of in in-plane and out-of-plane bonding leads to:
High E parallel to plane
Low E perpendicular to plane Nicholas Robinson Source: http://www. youtube .com/watch?v=SJdllffWUqg