The ratio of length (L) to diameter (D) of a reinforcing fiber is known as ______.
The ratio of length (L) to diameter (D) of a reinforcing fiber is known as ______.
The ratio of length (L) to diameter (D) of a reinforcing fiber is known as ______.
A、inhalation
B、exhalation
C、breathing
D、respirator
A.Foam composites B.Laminar composites
C.Nanocomposites D.Sandwich composites
A.rubber has a relatively small number of covalent crosslinks and thermoplastic polymers have none
B.thermoplastics don't melt when heated but rubbers do
C.rubber can be subjected to extensive plastic deformation whereas typical thermoplastics have little plasticity
D.all of the above
A.different polymer chains in a thermoplastic are held together by relatively weak Van der Waals bonds which can be broken at relatively low temperatures
B.thermoplastics are only lightly crosslinked in comparison to thermosets
C.both of the above
D.neither of the above
For example: The hardness of ceramics is greater than metals. Thus, the comparison is expressed as ceramics > metals. (2pts)
Thermal expansion: A)
From the above comparison, B) ______ have the lowest CTE and C) ______ have the weakest bonding forces among the aforementioned materials.
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