The compatibility requirement involves the relative

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The compatibility requirement involves the relative surface energy of the fiber material and of the matrix material. Matrix with surface energy smaller than that of the fibers tends to spread over the fiber surface and is more compatible with the fibers (bonding can be made). Question 5 : Using the square packing array, show that the interfiber spacing is given by: 1 4 f f v d where is the interfiber spacing, d f is the fiber diameter v f is the fiber volume fraction. The square is shown in the figure.
The assumption is that the volume of material has a unit thickness. The fiber volume fraction therefore has the same value as the fiber surface fraction. Let n be the number of fibers along one side of the square. 2 2 2 )] ( [ 4 f f f d n d n 2 ) ( 4 f f f d d f f f d d 4 ) ( 2 1 4 f f d Question 6 : What is the general difference between the viscosity of thermoset resins (in general as a group) and thermoplastic resins ( in general as a group). What is the implication of this phenomenon on the manufacturing strategy?
Question 7: What are the three important advantages that a material (like glass material) existing in fiber form over the same material in bulk form?
3. There exist many techniques to make fibers. These consist of drawing, oxidation, chemical vapor deposition etc. As such, fibers can be made from a variety of different raw materials with different properties.

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