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Unformatted text preview: .. (where l is the length of the cylinder and area is the projected area) σc
and net circumferential stress = σc −
The thickness of a cylinder wall (t) is usually obtained by using a thin cylindrical formula,i.e.,
t = 2σ
p = Maximum pressure inside the cylinder in N/mm2,
D = Inside diameter of the cylinder or cylinder bore in mm,
∴ Net longitudinal stress = σl − σc = Permissible circumferential or hoop stress for the cylinder material
in MPa or N/mm2. Its value may be taken from 35 MPa to
100 MPa depending upon the size and material of the cylinder.
C = Allowance for reboring.
The allowance for reboring (C ) depending upon the cylinder bore (D) for I. C. engines is given
in the following table :
Table 32.1. Allowance for reboring for I. C. engine cylinders.
D (mm) 75 100 150 200 250 300 350 400 450 500 C (mm) 1.5 2.4 4.0 6.3 8.0 9.5 11.0 12.5 12.5 12.5 The thickness of the cylinder wall usually varies from 4.5 mm to 25 mm or more depending
upon the size of the cylinder....
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This note was uploaded on 09/30/2012 for the course MECHANICAL 403 taught by Professor A.thirumoorthy during the Spring '11 term at Anna University Chennai - Regional Office, Coimbatore.
- Spring '11