Failure of Connecting Rod
During each rotation of the crankshaft, a connecting rod is often subject to large and repetitive forces: shear forces due to the angle between the piston and the crankpin, compression forces as the piston moves downwards, and tensile forces as the piston moving upwards. These forces are proportional to the engine speed (RPM) squared.
Failure of a connecting rod often called "throwing a rod", is one of the most common causes of catastrophic engine failure in cars, frequently driving the broken rod through the side of the crankcase and thereby rendering the engine irreparable. Common causes of connecting rod failure are tensile failure from high engine speeds, the impact force when the piston hits a valve (due to a valvetrain problem), rod bearing failure (usually due to a lubrication problem), or incorrect installation of the connecting rod.
Connecting Rod Assembly
A connecting rod for an internal combustion engine consists of the 'big end', 'rod', and 'small end' (or 'little end'). The small end attaches to the gudgeon pin (also called 'piston pin' or 'wrist pin'), which can swivel in the piston. Typically, the big end connects to the crankpin using a plain bearing to reduce friction; however, some smaller engines may instead use a rolling-element bearing, in order to avoid the need for a pumped lubrication system. Typically there is a pinhole bored through the bearing on the big end of the connecting rod so that lubricating oil squirts out onto the thrust side of the cylinder wall to lubricate the travel of the pistons and piston rings. A connecting rod can rotate at both ends so that the angle between the connecting rod and the piston can change as the rod moves up and down and rotates around the crankshaft.
How to Calculate Maximum Inertia Force on Bolts of Connecting Rod given Permissible Tensile Stress of Bolts?
Maximum Inertia Force on Bolts of Connecting Rod given Permissible Tensile Stress of Bolts calculator uses Inertia Force on Bolts of Connecting Rod = pi*Core Diameter of Big End Bolt^2*Permissible Tensile Stress/2 to calculate the Inertia Force on Bolts of Connecting Rod, Maximum Inertia force on bolts of connecting rod given permissible tensile stress of bolts is the maximum force acting on the bolts of the connecting rod and cap joint due to the force on the piston head and its reciprocation. Inertia Force on Bolts of Connecting Rod is denoted by Pi symbol.
How to calculate Maximum Inertia Force on Bolts of Connecting Rod given Permissible Tensile Stress of Bolts using this online calculator? To use this online calculator for Maximum Inertia Force on Bolts of Connecting Rod given Permissible Tensile Stress of Bolts, enter Core Diameter of Big End Bolt (dc) & Permissible Tensile Stress (σt) and hit the calculate button. Here is how the Maximum Inertia Force on Bolts of Connecting Rod given Permissible Tensile Stress of Bolts calculation can be explained with given input values -> 10214.1 = pi*0.007522528^2*90000000/2.