Local Stress Analysis (DNV Helica)
DNV Helica is specialist simulation software for analysis of cables, flexible pipes and umbilicals.
The following types of analyses are considered:
- Load-sharing between elements considering axis-symmetric analysis
- Calculation of cross-sectional stiffness properties (axial, torsional and bending stiffness)
- Helix element bending performance analysis to describe stresses in helix elements during bending considering stick/slip behavior due to interlayer frictional forces
- Tabulation of stresses in selected interior components due to combined bending and tensile loading on the cross-section
- Assessment of capacity curves for combined bending and tensile loading of the cross-section
It is of critical importance that stick/slip friction effects of subsea umbilical inner components (which are typically laid helically) are assessed to ensure that stress in these components is accurately predicted.
SeaThor can perform these calculations to determine the maximum stress in a particular component and thus derive component fatigue life using output from dynamic analysis and material SN data.