Maximum Bending Stress in Big End Cap of Connecting Rod Solution

STEP 0: Pre-Calculation Summary
Formula Used
Bending Stress in Big end of Connecting Rod = Inertia Force on Bolts of Connecting Rod*Span Length of Big End Cap/(Thickness of Big End Cap^2*Width of Big End Cap)
σbbig = Pi*l/(tc^2*bc)
This formula uses 5 Variables
Variables Used
Bending Stress in Big end of Connecting Rod - (Measured in Pascal) - Bending stress in big end of connecting rod is the stress induced in the big end cap of a connecting rod when an external force or moment is applied to the element, causing the element to bend.
Inertia Force on Bolts of Connecting Rod - (Measured in Newton) - Inertia force on bolts of connecting rod is the force acting on the bolts of the connecting rod and cap joint due to the force on the piston head and its reciprocation.
Span Length of Big End Cap - (Measured in Meter) - Span length of big end cap of a connecting rod is the distance between the bolt centers of the bolts used for fastening the big end cap.
Thickness of Big End Cap - (Measured in Meter) - Thickness of big end cap is the thickness of the big end cap of the connecting rod.
Width of Big End Cap - (Measured in Meter) - Width of big end cap is the width of the big end cap of the connecting rod.
STEP 1: Convert Input(s) to Base Unit
Inertia Force on Bolts of Connecting Rod: 8000 Newton --> 8000 Newton No Conversion Required
Span Length of Big End Cap: 80 Millimeter --> 0.08 Meter (Check conversion here)
Thickness of Big End Cap: 12 Millimeter --> 0.012 Meter (Check conversion here)
Width of Big End Cap: 76 Millimeter --> 0.076 Meter (Check conversion here)
STEP 2: Evaluate Formula
Substituting Input Values in Formula
σbbig = Pi*l/(tc^2*bc) --> 8000*0.08/(0.012^2*0.076)
Evaluating ... ...
σbbig = 58479532.1637427
STEP 3: Convert Result to Output's Unit
58479532.1637427 Pascal -->58.4795321637427 Newton per Square Millimeter (Check conversion here)
FINAL ANSWER
58.4795321637427 58.47953 Newton per Square Millimeter <-- Bending Stress in Big end of Connecting Rod
(Calculation completed in 00.004 seconds)

Credits

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Shri Govindram Seksaria Institute of Technology and Science (SGSITS ), Indore
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11 Big End Cap and Bolt Calculators

Inertia Force on Bolts of Connecting Rod
Go Inertia Force on Bolts of Connecting Rod = Mass of Reciprocating Parts in Engine Cylinder*Angular Velocity of Crank^2*Crank Radius of Engine*(cos(Crank Angle)+cos(2*Crank Angle)/Ratio of length of connecting rod to crank length)
Thickness of Big End Cap of Connecting Rod given Bending Stress in Cap
Go Thickness of Big End Cap = sqrt(Inertia Force on Bolts of Connecting Rod*Span Length of Big End Cap/(Width of Big End Cap*Bending Stress in Big end of Connecting Rod))
Maximum Inertia Force on Bolts of Connecting Rod
Go Inertia Force on Bolts of Connecting Rod = Mass of Reciprocating Parts in Engine Cylinder*Angular Velocity of Crank^2*Crank Radius of Engine*(1+1/Ratio of length of connecting rod to crank length)
Maximum Bending Moment on Connecting Rod
Go Bending moment on connecting rod = Mass of Connecting Rod*Angular Velocity of Crank^2*Crank Radius of Engine*Length of the connecting rod/(9*sqrt(3))
Width of Big End Cap of Connecting Rod given Bending Stress in Cap
Go Width of Big End Cap = Inertia Force on Bolts of Connecting Rod*Span Length of Big End Cap/(Thickness of Big End Cap^2*Bending Stress in Big end of Connecting Rod)
Maximum Bending Stress in Big End Cap of Connecting Rod
Go Bending Stress in Big end of Connecting Rod = Inertia Force on Bolts of Connecting Rod*Span Length of Big End Cap/(Thickness of Big End Cap^2*Width of Big End Cap)
Core Diameter of Bolts of Big End Cap of Connecting Rod
Go Core Diameter of Big End Bolt = sqrt(2*Inertia Force on Bolts of Connecting Rod/(pi*Permissible tensile stress))
Mass of Connecting Rod
Go Mass of Connecting Rod = Cross Sectional Area of Connecting Rod*Density of connecting rod material*Length of the connecting rod
Maximum Inertia Force on Bolts of Connecting Rod given Permissible Tensile Stress of Bolts
Go Inertia Force on Bolts of Connecting Rod = pi*Core Diameter of Big End Bolt^2*Permissible tensile stress/2
Span Length of Big End Cap of Connecting Rod
Go Span Length of Big End Cap = Diameter of Crank Pin+2*Thickness of Bush+Nominal Bolt Diameter+0.003
Bending Moment on Big End Cap of Connecting Rod
Go Bending moment on big end of connecting rod = Inertia Force on Bolts of Connecting Rod*Span Length of Big End Cap/6

Maximum Bending Stress in Big End Cap of Connecting Rod Formula

Bending Stress in Big end of Connecting Rod = Inertia Force on Bolts of Connecting Rod*Span Length of Big End Cap/(Thickness of Big End Cap^2*Width of Big End Cap)
σbbig = Pi*l/(tc^2*bc)

Materials for making Connecting Rod

Connecting rods can be made from various grades of structural steel, aluminum, and titanium. Steel rods are the most widely produced and used as connecting rods. Their applications are best used for daily drivers and endurance racing due to their high strength and long fatigue life. The only problem with using steel rods is that the material is extremely heavy, which consumes more power and adds stress to the rotating assembly. Below mentioned materials are taken as connecting rod materials- Carbon Steels, High strength low alloy steel, Corrosion-resistant high strength low alloy steel, and Quenched and tempered alloy steel.

How to Calculate Maximum Bending Stress in Big End Cap of Connecting Rod?

Maximum Bending Stress in Big End Cap of Connecting Rod calculator uses Bending Stress in Big end of Connecting Rod = Inertia Force on Bolts of Connecting Rod*Span Length of Big End Cap/(Thickness of Big End Cap^2*Width of Big End Cap) to calculate the Bending Stress in Big end of Connecting Rod, Maximum bending stress in big end cap of connecting rod is the maximum amount of bending stresses induced into the cap or the keep plate due to the inertia forces acting on it. Bending Stress in Big end of Connecting Rod is denoted by σbbig symbol.

How to calculate Maximum Bending Stress in Big End Cap of Connecting Rod using this online calculator? To use this online calculator for Maximum Bending Stress in Big End Cap of Connecting Rod, enter Inertia Force on Bolts of Connecting Rod (Pi), Span Length of Big End Cap (l), Thickness of Big End Cap (tc) & Width of Big End Cap (bc) and hit the calculate button. Here is how the Maximum Bending Stress in Big End Cap of Connecting Rod calculation can be explained with given input values -> 5.8E-5 = 8000*0.08/(0.012^2*0.076).

FAQ

What is Maximum Bending Stress in Big End Cap of Connecting Rod?
Maximum bending stress in big end cap of connecting rod is the maximum amount of bending stresses induced into the cap or the keep plate due to the inertia forces acting on it and is represented as σbbig = Pi*l/(tc^2*bc) or Bending Stress in Big end of Connecting Rod = Inertia Force on Bolts of Connecting Rod*Span Length of Big End Cap/(Thickness of Big End Cap^2*Width of Big End Cap). Inertia force on bolts of connecting rod is the force acting on the bolts of the connecting rod and cap joint due to the force on the piston head and its reciprocation, Span length of big end cap of a connecting rod is the distance between the bolt centers of the bolts used for fastening the big end cap, Thickness of big end cap is the thickness of the big end cap of the connecting rod & Width of big end cap is the width of the big end cap of the connecting rod.
How to calculate Maximum Bending Stress in Big End Cap of Connecting Rod?
Maximum bending stress in big end cap of connecting rod is the maximum amount of bending stresses induced into the cap or the keep plate due to the inertia forces acting on it is calculated using Bending Stress in Big end of Connecting Rod = Inertia Force on Bolts of Connecting Rod*Span Length of Big End Cap/(Thickness of Big End Cap^2*Width of Big End Cap). To calculate Maximum Bending Stress in Big End Cap of Connecting Rod, you need Inertia Force on Bolts of Connecting Rod (Pi), Span Length of Big End Cap (l), Thickness of Big End Cap (tc) & Width of Big End Cap (bc). With our tool, you need to enter the respective value for Inertia Force on Bolts of Connecting Rod, Span Length of Big End Cap, Thickness of Big End Cap & Width of Big End Cap and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.
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