Machine Design
According to I.B.R., the efficiency of a triple riveted butt joint with double straps of unequal width (5 rivets per pitch length) should be

45 to 60%
63 to 70%
70 to 83%
80 to 90%

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Machine Design
Spring stiffness is

Load required to produce unit deflection
Its ability to absorb shocks
Its capability of storing energy
Ratio of coil diameter to wire diameter

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