13.4Q) Carbon Fiber Reinforced Polymer

Covalent bonding is chemical bonding from...?

• ...the attraction of positive metal ions and delocalized electrons.

• ...sharing of electron pairs between atoms.

• ...the transfer of electrons between atoms.

• ...the attraction between electronegative atoms and lone pairs.

Tags

NGSS.HS-PS1-1

Covalent bonding gets stronger if...

• ...there are more delocalized electrons.

• ...there are more shared electrons.

• ...the size of the atoms get bigger.

• ...the mass of the atoms get bigger.

Covalent bonds require...

• ...high energy to break.

• ...moderate energy to break.

• ...low energy to break.

Tags

NGSS.HS-PS1-4

Van der Waals forces for small molecules require...

• ...high energy to break.

• ...moderate energy to break.

• ...low energy to break.

Van der Waals forces for very large molecules require...

• ...high energy to break.

• ...moderate energy to break.

• ...low energy to break.

Which mechanical properties have high values in most wood?

• Viscoelasticity

• Malleability

• Density gradient

• Grain structure

• Tear resistance

Categorize

Groups:

(a) Macroscopic

,

(b) Microscopic

,

(c) Atomic/Molecular

,

(d) Subatomic

• Matrix type

• Interlaminar shear strength

• Covalent bonds

• Van der Waals forces in matrix

• Fiber length

• Interfacial shear strength

• hybridization

• Amorphous structure of matrix

• Fiber breakage/loading

• Aspect ratio

• Weave pattern

• Dispersion Homogeneity

• FIber volume fraction

• Non-metal elements

• Polymer chains

• Crystalline structure of carbon

Match the following

• Matrix type

• The uniform distribution of carbon fibers within the polymer matrix, which influences the interfacial stress shifting.

• Fiber volume fraction

• Two different types include Short carbon fiber-reinforced polymer (SCFRP) and continuous carbon fiber-reinforced polymer (CCFRP).

• Fiber length

• The volume percentage of carbon fibers within the composite, which has a linear relationship with the composite's mechanical properties.

• Weave pattern

• The orientation of the fibers when made into a fabric.

• Dispersion homogeneity

• The glue that holds the carbon fibers together into a shape.

Match the following

• Fiber Breakage and loading

• The strength of the bond between the different layers or plies in a laminated CFRP composite, which can impact the overall mechanical performance

• Interfacial shear strength

• equivalent to fiber loading, which can negatively impact the mechanical performance of the composite

• Interlaminar shear strength

• The ratio of the length to diameter of the reinforcing carbon fibers, where a higher aspect ratio maximizes the load transfer

• Aspect ratio

• The strength of the bond between the carbon fibers and the polymer matrix, which affects the composite's mechanical properties

Match the following

• Hybridization

• The ordered, three-dimensional arrangement of polymer chains, which can coexist with amorphous regions and impact the mechanical, thermal, and optical properties of the polymer

• Polymer Chain

• The planar, hexagonal arrangement of carbon atoms in the carbon fibers, which contributes to their high thermal and electrical conductivity

• Graphitic Structure

• Imperfections or irregularities in the atomic structure of carbon fibers, such as vacancies, dislocations, and dangling bonds, which can affect the composite's mechanical performance

• Amorphous Structure (aka defects)

• The long, intertwined molecular chains of the polymer matrix, held together by weaker van der Waals forces

• Crystalline Structure

• The mixing of atomic orbitals in carbon atoms, resulting in different bonding configurations (sp, sp2, sp3) that influence the properties of carbon-based materials

Tags

NGSS.HS-PS2-6