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1+ Connecting rod cross section :
‘The axial stresses are produced due to cylindor gas pressure [compressive oniy) and the Inertia force
‘sng in account of reciprocating action (both tensile as wel as compressive), whereas bending stresses
are caused due to the centrifugal effects. consists ofa long shank, a small end and a big end. The cross
Section ofthe shank may be rectangular, circular tubular, -secion or H-secton. Generally ctcular section
Is used for low speed engines while I-section is preferred for high speed engines.
| section is used for adequate strength, stiffness and minimum weight of the connecting cod. Twice every
revolution, the connecting rod comes to 2 stop. Ths exerts a massive pressure on the bigend bearing and
‘onthe itleend bearing. By reducing the mass ofthe rod, this pressure is reduced, The typical" section
reduces the mass without weakening the rod
"When gas force acts on connacting rod, it behaves lie a strut with both ends hinged in plane of rotation
and both ends fixed In the perpendicular plane, The connecting rod fs equally strong if satisfies the
condition:
4. jy where, = moment of inertia.
Inthe plane of rotation connecting rod Is considered as a strut or column subjected to maximum
compressive load Ona and pin joints at both the ends. Hence equivalent length Le Is equal to length
between the supports in the plane perpendicular to the plane of rotation. Hf the ends are fixed the
equivalent length Leis 2. _As rotation I very Important, the design of connecting od is based on buckling.
8 Rankin Formula,
f= SBE Porson of rotation na
doe
f= 477 for plane perpendicular to plane of rotation
Tons
vada
«and ar constant for eierent materi
forsaie stress value F< Fy
Asm Avo
idee dey
1sh(les) 143(tan)
< (2) ro La Ley Ve,
Ket and yy = ALK?
