A Moving To Another Question Will Save This Response Question 11 What Is Meant By A Coupled Variable In A Materials Sel 1 (46.65 KiB) Viewed 10 times
A Moving to another question will save this response. Question 11 What is meant by a coupled variable in a materials selection translation? O A parameter that is fixed in the constraint equation but free in the objective equation. O A parameter that is unrestricted in how it can vary. O Any parameter that appears in both the constraint equation and the objective equation. O A free parameter that appears in the constraint equation. O A free parameter that appears in both the constraint equation and the objective equation. A Moving to another question will save this response. Question 11 of 36 > >> 2 points Save Answer <<< Question 11 of 36 > >>
A Moving to another question will save this response. <<< Question 12 of 36 > >> Question 12 2 points Save Answer When selecting for a cheap, stiff shaft (i.e. in torsion) the constraint equations for the magnitude of twist use the shear modulus (G) rather than Young's modulus (E). Why can we reasonably substitute E (which is more readily available) for G in the material index? O Generally, E is proportional to G so ranking with one of them results in the same ranking order as with the other. O G is smaller than E so fulfilling the constraint for G means we automatically fulfil the constraint using E. O The value for E and G are actually quite similar and the error introduced is small compared to the assumptions we are making. O So long as the radius of the shaft is free, and so can compensate for the change in modulus, the constraint will be fulfilled either way. A Moving to another question will save this response. << Question 12 of 36 > >> 7
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