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DNV 1981 Ed. Equivalent Stress
Note
This code checks complies with Det Norske Veritas "Rules For Submarine Pipeline System", 1981 Ed.
The DNV 81' equivalent stress is defined as follows :
\[
DNV81Stress = \sqrt{\Bigl(\frac{N}{A} + \frac{0.85 \ldotp M}{W} \Bigr)^2 + \sigma \ldotp \frac{2}{y} - \Bigl(\frac{N}{A} + \frac{0.85 \ldotp M}{W} \Bigr) \ldotp \sigma_y}
\]
where :
-
\(N\) = Axial force (including effect of water pressure)
-
\(A\) = Cross sectional area of pipe
-
\(M\) = Bending moment
-
\(W\) = Section modulus of pipe
-
\(\sigma_y\) = hoop stress
