By Kuethe A.M., Chow C.-Y.
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Extra resources for Foundations of aerodynamics
7 gives the characteristics of two composites made of tridimensional carbon/carbon. The mechanical properties are the same along all directions noted 15 16 17 by ᐉ in the following figure. The composite is transversely isotropic. 2. Product of the Aerolor company (FRA). Product of European company in propulsion (FRA). 4) and Ⅲ Reinforcements (fibers): aramid, carbon, boron, silicon carbide (SiC) Example: ARALL (Aluminum Reinforced Aramid) and GLARE (Aluminum 18 Reinforced Glass). 19). Example: Short silicon carbide fibers (whiskers)/aluminum.
5). ν ᐉt = ν f V f + ν m V m Ⅲ Modulus along any direction: The modulus along a certain direction in 8 plane ᐉt, other than along the fiber and transverse to the fiber, is given in the expression below, where c = cos θ and s = sin θ. 6). 1 E x = ---------------------------------------------------------4 4 ν 2 2⎛ 1 c s ---- + --- + 2c s -------- – ----ᐉ-t⎞ ⎝ 2G ᐉ t E ᐉ ⎠ Eᐉ Et 8 The calculation of these moduli is shown in details in Chapter 11. 7 show the important difference in the behavior between classical metallic materials and the unidirectional plies.
17 allows the comparison of the cost to fabricate composite products. One needs to note the important difference between the cost of composites produced in large volume and the cost of high performance composites. fm Page 29 Wednesday, February 14, 2007 1:55 PM 3 PLY PROPERTIES It is of fundamental importance for the designer to understand and to know precisely the geometric and mechanical characteristics of the “fiber + matrix” mixture which is the basic structure of the composite parts. The description of these characteristics is the object of this chapter.