Target radius of curvature: R [m]
Target curvature: 1/R [1/m]
Nominal strain: (OR-t/2)/R (ABAQUS) or OR/R (Orcaflex)
Pipe length to measure OOS: L [m]
Angle: φ = L/R [rad]
OOS over a Lm length:
OOS = R*(1-cos(φ/2)) [m]
= R*2*(sin(φ/2)^2) [m]
approximation-1 ~ R/2*(φ^2) [m]
approximation-2:
The target out-of-straightness (OOS) over the measured pipe length of Lm is calculated as the following formula, where the target residual radius of curvature is RT:
OOS = RT – sqrt(RT^2 – Lm^2/4)
TRUC: total residual unloaded curvature
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