5. Stress of 270 MPa with E = 70 GPa. If the part is 150 mm long, what is the in

Question

5. Stress of 270 MPa with E = 70 GPa. If the part is 150 mm long, what is the increase in  

length?

Hint, 150mm = 0.15m and E x stress = strain, and strain = change in length/original  

length.

(up to 10 points)

6. Five rivets have a radius of 5 mm each. If the total shear load is 3000 N and shear  

strength is 250 MPa, will they fail?

Hint, 5 mm = 0.005 m, cross sectional area of a rivet is x r^2

(up to 10 points)

7. Find an estimate of an engine weight used on a typical aircraft of your choosing. What  

will the bending moment be if the engine is 3 m from the fuselage?

(up to 20 points).

8. What happens to the bending moment beyond the first engine in the question above?

Hint, you need a force to create a bending moment.

(up to 10 points)

Explanation / Answer

5.

we know that

E*strain = stress

strain = change in length/original length

E*dL/L = S

Using given values:

dL = S*L/E

dL = 270*10^6*150*10^-3/(70*10^9)

dL = 0.58*10^-3 m

dL = 0.58 mm = increase in length

Please Upvote. Let me know if you have any doubts.

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