Residual stress in materials

Machine Design
Residual stress in materials

Is independent of external loads

Is always harmful

Becomes zero when external load is removed

Acts when external load is applied

Is independent of external loads

Is always harmful

Becomes zero when external load is removed

Acts when external load is applied

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Machine Design
In a hydrodynamic lubricated bearing

There is no lubricant between the journal and the bearing

There is a thin film of lubricant between the journal and the bearing

The lubricant is forced between the journal and the bearing, by external pressure

There is a thick film of lubricant between the journal and the bearing

There is no lubricant between the journal and the bearing

There is a thin film of lubricant between the journal and the bearing

The lubricant is forced between the journal and the bearing, by external pressure

There is a thick film of lubricant between the journal and the bearing

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Machine Design
The stiffness of a closely coiled helical spring subjected to an axial load W is equal to (where G = Modulus of rigidity, and n = Number of active coils)

Gd3/ 8D3n

Gd⁴/ 8D²n

Gd⁴/ 8D3n

Gd⁴/ 4D3n

Gd3/ 8D3n

Gd⁴/ 8D²n

Gd⁴/ 8D3n

Gd⁴/ 4D3n

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Machine Design
The material commonly used for crane hooks is

Wrought iron

Cast iron

Aluminium

Mild steel

Wrought iron

Cast iron

Aluminium

Mild steel

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Machine Design
Tearing resistance required to tear off the plate per pitch length is (where p = Pitch of rivets, d = Dia. of rivet hole, and σt = Permissible tensile stress for plate material)

p.t.σt

(p - d) t.σt

p.d.σt

p.t.σt

(p - d) t.σt

p.d.σt

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Machine Design
The relation between the pitch of the chain (p) and pitch circle diameter of the sprocket (D) is given by (where T = Number of teeth on the sprocket)

p = D sin (120°/T)

p = D sin (180°/T)

p = D sin (360°/T)

p = D sin (90°/T)

p = D sin (120°/T)

p = D sin (180°/T)

p = D sin (360°/T)

p = D sin (90°/T)

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Machine Design

Machine Design Residual stress in materials

Machine Design In a hydrodynamic lubricated bearing

Machine Design The stiffness of a closely coiled helical spring subjected to an axial load W is equal to (where G = Modulus of rigidity, and n = Number of active coils)

Machine Design The material commonly used for crane hooks is

Machine Design Tearing resistance required to tear off the plate per pitch length is (where p = Pitch of rivets, d = Dia. of rivet hole, and σt = Permissible tensile stress for plate material)

Machine Design The relation between the pitch of the chain (p) and pitch circle diameter of the sprocket (D) is given by (where T = Number of teeth on the sprocket)

Machine Design
Residual stress in materials

Machine Design
In a hydrodynamic lubricated bearing

Machine Design
The stiffness of a closely coiled helical spring subjected to an axial load W is equal to (where G = Modulus of rigidity, and n = Number of active coils)

Machine Design
The material commonly used for crane hooks is

Machine Design
Tearing resistance required to tear off the plate per pitch length is (where p = Pitch of rivets, d = Dia. of rivet hole, and σt = Permissible tensile stress for plate material)

Machine Design
The relation between the pitch of the chain (p) and pitch circle diameter of the sprocket (D) is given by (where T = Number of teeth on the sprocket)