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Characteristics of Plastics

Define the fo...

Question

Define the following : Rivet

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Solution

a short metal pin or bolt for holding together two plates of metal, its headless end being beaten out or pressed down when in place

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Q. A single riveted lap joint of two similar plates as shown in the figure below has the following geometrical and material details.

width of the plate

w = 200 m m,

thickness of the plate

t = 5 m m

, number of rivets

n = 3

, diameter of the rivet

d_{r} = 10 m m

, diameter of the rivet hole

d_{n} = 11 m m

, allowable tensile stress of the plate

σ_{p} = 200 M P a

, allowable shear stress of the rivet

σ_{s} = 100 M P a

and allowable bearing stress of the rivet

σ_{c} = 150 M P a

.
If the rivets are to be designed to avoid crushing failure, the maximum permissible load

P

k N

Q. Read the following statements (A - D) related to the rivet popper hypothesis and select the correct option stating true (T) and false (F).
A. Paul Ehrlich proposed the rivet popper hypothesis
B. The extinction of a key species will become a threat to the safety of other species.
C. Ecosystem represents the rivets of an aeroplane.
D. Wing rivets represent the key species of an ecosystem.

Q. Rosie the Riveter became famous in the 1940s as which of the following?

Q. In "Rivet popper hypothesis " Paul Ebrlich ,the rivets on the wings represents __________ in ecosystem

Q. Two strips of metal are riveted together at their ends by four rivets, each of diameter

6 m m

. Assume that each rivet is to carry one quarter of the load. If the shearing stress on the rivet is not to exceed

6.9 \times 10^{7} P a

, the maximum tension that can be exerted by the riveted strip is then

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