As a new design engineer at JAMCO, a Japanese supplier for Airbus A380, you are

Question

As a new design engineer at JAMCO, a Japanese supplier for Airbus A380, you are asked by your boss to redesign the structural I-beam using lighter materials. The key criteria for the redesign are superior strength-to-weight ratio and minimal cost. Having taken Engr 200, you decided to experiment with several composites to find a suitable candidate.

Given the material properties in Table 1, please answer the following:

(a) What are the moduli of elasticity of Carbon/Epoxy, Aramid/Epoxy, and Boron/Epoxy
composites in the longitudinal direction, given the composites consist 45 vol% epoxy and 55
vol% fiber?
(b) What are the specific moduli of each of these composites?
(c) What are the specific strengths (i.e. specific UTS) of each of these composites?
(d) Given the engineering criteria provided, which of these composite(s) would you
recommend?

Explanation / Answer

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