Unbonded flexible risers consist of several helical and cylindrical layers, which can undergo
large bending deformation and can be installed in different configurations to adapt to harsh …

This work investigates the extensional-torsional response of a flexible pipe with one up to
ten wires broken in its outer tensile armor. Experimental tests were conducted, and the …

The local mechanical response of a 2.5" unbonded flexible riser with damaged wires is
studied by a nonlinear finite element (FE) model. Firstly, the riser was supposed to be under …

Flexible pipes are critical elements for offshore oil and gas development and determining its
response in axisymmetric loadings is of paramount importance. Often the anti-birdcage tape …

Unbonded flexible risers have been applied in the harsh environment for several decades,
and structural failure sometimes appears. Owing to the large axial compression by …

This paper presents a method to predict the bending hysteretic behavior of unbonded
flexible pipes using full layered numerical general finite element models with an implicit …

The number of flexible pipes in operation is increasing due to new field developments and
the desire to extend the lifetime of existing fields. There have been many challenges with …

Flexible pipes are fundamental in various offshore oil and gas exploration applications, such
as production, gas injection, gas lift, or water injection lines. However, such structures can …

Many of the flexible risers in service do not meet their documented service life. A common
failure mode is the rupture of the abrasive external layer which, in itself, is not critical, but …

There have been many challenges with respect to long term operation of flexible pipes, in
many cases with the need to replace or repair them before the end of the initial design life …