BOUNDARY
Contact stresses
Q: How is the nub-valley contact accounted for? I can’t se the contact pressures in XPOST when opening the xx_bflex2010.raf file. Shall it be activated in the VISRES or similar card?
A: You will see the contact pressures directly by looking at the Normal stress (sigma-zz) result type for the boundary group
Friction coefficient in nub-valley
Q: In BFLEX, which friction coefficient is used for the nub-groove contact in BOUNDARY?
A: The friction coefficient will follow the value provided in the FLEXCROSS input for the corresponding layer.
Transverse stresses
Q: Nub-Valley friction induced flexlok section transverse stresses (boundary), can they be visualized?
A: Look at Transverse stress (sigma-yy) and Shear stress (sigma-xy) result type for the boundary group
INOD
Q: INOD, would there be results differences depending on which INOD is selced?
A: The user can select the position of the boundary model. This is to be able to choose a critical position along for example a bend-stiffener. So yes, changing INOD may mean different curvature histories and hence difference in the boundary and pflex stresses.
The Axial stress results in the -boundary model
Q: The Axial stress results in the -boundary model looks strange?
A: The Axial stress, Normal curvature stress and Transverse curvature stress results are populated by PFLEX, even though the results can be seen in the -boundary model part in Xpost. You should hence perform the PFLEX analysis before the inspecting these results. Note that for the Transverse curvature stress results, the -boundary model results only contain the dynamic, bending induced part of the stresses, excluding the axi-symmetric part.