Directional properties in fiber composites are achieved mainly due to ______. A.fiber orientation
Directional properties in fiber composites are achieved mainly due to ______.
A.fiber orientation B.laminate plane C.interphase D.prepregs
Directional properties in fiber composites are achieved mainly due to ______.
A.fiber orientation B.laminate plane C.interphase D.prepregs
A、Social revolution.
B、Economic depression.
C、Cultural changes.
D、Political reform.
A.Producing parts with complex shapes and close tolerances
B.High part-to-part uniformity and reproducibility
C.Excellent control of fiber-to-resin ratios and low void content
D.Producing parts with constant cross-section shape in a continuous way
A.the amount of reinforcement in a composite material
B.is expressed in volume fraction
C.a factor influencing the composite
D.the strength of the composite is inversely proportional to the volume fraction of fiber present
A.A fiber can be properly wetted by a matrix only when the surface energy of matrix is greater than that of the fiber
B.A fiber can be properly wetted by a matrix only when the surface energy of matrix is lower that that of the fiber
C.A fiber can be properly wetted by a matrix only when the surface energy of matrix is equal to that of the fiber
D.It is nothing to do with surface energies of matrix and fiber
A.The color, surface electric resistance, free radical groups, and roughness of the material to be bonded
B.The weight, surface free energy, smell, and roughness of the material to be bonded
C.The wettability, surface free energy, polar groups, and roughness of the material to be bonded
D.The thickness, surface free energy, polar groups, and flatness of the material to be bonded
A.To protect the fiber surface from damage and bind fibers together for ease of processing.
B.To lubricate the fibers for less abrasion during subsequent processing operations.
C.To impart thermal and electric conductivity.
D.To provide a chemicallink between the fiber surface and the matrix and improve the bonding at the interface.
A.Carbon fiber has a higher modulus than graphite fiber
B.Graphite fiber has a lower content than carbon fiber
C.Carbon fiber has a higher pyrolyzinig temperature than graphite fiber
D.None of above.
A.Kevlar fiber, glass fiber, graphite fiber
B.Glass fiber, Kevlar fiber, graphite fiber
C.Graphite fiber, glass fiber, Kevlar fiber
A.Aramide B.Earthscreens C.Geosynthetics D.Styrofoams
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