Enter the values of modulus elasticity E(lbf/lnches2), moment of inertia I(lnches4)  & length L2(inches) to determine the value of Critical Load CL(lbf).

 Enter Modulus Elasticity: lbf/lnches2 Enter Moment of Inertia: lnches4 Enter Length L2: inches Result – Critical Load: lbf

The critical load CL(lbf) in lbf is equal to the modulus elasticity E(lbf/lnches2) in lbf per inches square to multiply the moment of inertia I(lnches4) in length4 and again multiply the (3.141)2 value and divided by the length L2(inches) in inches.

The formula of critical force can be writtern as,

CL(lbf) = ( pi2 * E(lbf/lnches2)  * I(lnches4) ) / L2(inches)

Here,

CL(lbf) = critical load in lbf

E(lbf/lnches2)  = modulus elasticity in lbf per inches square

I(lnches4) = moment of inertia in lnches4

L2(inches) = length in inches

1)To find the critical force and the modulus elasticity 400lbf/inches2 and the moment of inertia 20lnches4 and the length 5inches.

CL = ( pi2 * E * I ) /  L2

CL = ( 3.1412 * 400 * 20 ) / 52

CL = 3157.08lbf.

2)To find the length and the critical force 3157.08lbf and the modulus elasticity 400lbf/inches2 and the moment of inertia 20lnches4 .