Design of Connecting Rod
Stresses and Deformation
A connecting rod is subjected to direct compressive and tensile stress. Therefore, it is designed as a strut using the ranking formula.
According to the Rankine Formulae, the axial load W about the x-axis is represented by
and about the y-axis represented by
[Equation 2]
Since a Connecting Rod must be equally strong in buckling about both axis, the buckling loads must be identical.
[Equation 3] or [Equation 4]
According to the Rankine Formulae, the axial load W about the x-axis is represented by
and about the y-axis represented by
[Equation 2]
Since a Connecting Rod must be equally strong in buckling about both axis, the buckling loads must be identical.
[Equation 3] or [Equation 4]
Mechanical Properties of Carbon Steel and Aluminum Alloy 2024-T4
Calculations
Thickness of flange and web section: t
Section width: \[ {\color{black}\{B = 4t}} \];
Height of section: H = 5t;
Area of section: \[ {\{A} = 2(4t x t) + 3t x t = 11t^2}} \]
Moment of Inertia about x-axis:
Ixx = 1/12[4t(5t)^3 - 3t(3t)^3] = 419/12(t^4)
Moment of Inertia about y-axis:
Iyy = (2 x 1)/12 x t x (4t)^3 + 1/12(3t)t^3 = 131/12 (t^4)
Ixx/Iyy = 3.2
Lenght of Connecting Rod (L) = 2 x stroke
Buckling
Section width: \[ {\color{black}\{B = 4t}} \];
Height of section: H = 5t;
Area of section: \[ {\{A} = 2(4t x t) + 3t x t = 11t^2}} \]
Moment of Inertia about x-axis:
Ixx = 1/12[4t(5t)^3 - 3t(3t)^3] = 419/12(t^4)
Moment of Inertia about y-axis:
Iyy = (2 x 1)/12 x t x (4t)^3 + 1/12(3t)t^3 = 131/12 (t^4)
Ixx/Iyy = 3.2
Lenght of Connecting Rod (L) = 2 x stroke
Buckling