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Machine Design

Machine Design
A rivet is specified by

Length of tail
Shank diameter
Length of rivet
Type of head

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Machine Design
The efficiency of a riveted joint is equal to

Pt /P
Least of Pt, Ps and Pc/P
Ps /P
Pc /P

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Machine Design
The notch sensitivity q is expressed in terms of fatigue stress concentration factor Kf and theoretical stress concentration factor Kt as

(Kf - 1)/ (Kt - 1)
(Kt - 1)/ (Kf - 1)
(Kt + 1)/ (Kf + 1)
(Kf + 1)/ (Kt + 1)

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Machine Design
Two closely coiled helical springs with stiffness k₁ and k₂ respectively are connected in series. The stiffness of an equivalent spring is given by

(k₁ k₂)/ (k₁ + k₂)
(k₁ - k₂)/ (k₁ k₂)
(k₁ - k₂)/ (k₁ + k₂)
(k₁ + k₂)/ (k₁ k₂)

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Machine Design
The process which improves the machinability of steels, but lowers the hardness and tensile strength is

Full annealing
Process annealing
Spheroidising
Normalising

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Machine Design
When an open coiled helical compression spring is subjected to an axial compressive load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl's stress factor, and W = Axial compressive load on the spring)

(4WD/ πd3) × K
(WD/ πd3) × K
(2WD/ πd3) × K
(8WD/ πd3) × K

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