About factor "F" of ABS ORY rules

Hello,

When you calculate the thickness of plating or the SM of a stiffener, you have need to factor "F" (reduction pression factor).

For that, you must calculate the factor Cf (for exemple in metric units for plating) :
Cf = (s - 254)/(54.2 L + 559)
and enter in the table 7-4 whitch give the factor "F".

Do you know a mathematic formula for calculate "F" with the Cf without used the table 7-4 .

Thank-you by advance


Best regards


Jacques

 

Jacques,

This formula:

F = 0.539*Cf^2-1.2915*Cf+1.0032

will give you these values:

Cf________F
1.0______0.251
0.9______0.277
0.8______0.315
0.7______0.363
0.6______0.422
0.5______0.492
0.4______0.573
0.3______0.664
0.2______0.766
0.1______0.879
0.05_____0.940
0.0______1.003

 

Thank-you very very much, Paul !