Agent skill
fe-analyst-1-fea-fundamentals-for-slender-structures
Sub-skill of fe-analyst: 1. FEA Fundamentals for Slender Structures.
Install this agent skill to your Project
npx add-skill https://github.com/vamseeachanta/workspace-hub/tree/main/.claude/skills/_archive/engineering/marine-offshore/fe-analyst/1-fea-fundamentals-for-slender-structures
SKILL.md
1. FEA Fundamentals for Slender Structures
1. FEA Fundamentals for Slender Structures
OrcaFlex models slender structures (pipes, lines, cables) as Euler-Bernoulli beam elements with:
| DOF per node | Description |
|---|---|
| u, v, w | Translational (surge, sway, heave) |
| θx, θy, θz | Rotational (roll, pitch, yaw) |
Element stiffness contributions:
- Axial stiffness:
EA(axial force vs. extension) - Bending stiffness:
EI(moment vs. curvature) - Torsional stiffness:
GJ(torque vs. twist) - Shear stiffness: optional (Timoshenko)
Key non-linearities in slender structure FEA:
- Geometric non-linearity (large displacements, catenary shape)
- Contact non-linearity (seabed, bend stiffeners, clamps)
- Material non-linearity (yield — typically not modelled for fatigue)
- Hydrodynamic drag non-linearity (Morison equation, velocity-squared)
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