Sandwich Pipes With Strain Hardening Cementitious Composites (SHCC): Numerical Analyses

Abstract

Sandwich pipes (SP) combining high structural resistance with thermal insulation have been considered as an effective solution for using in ultra deepwater pipelines. Research has been conducted at COPPE/UFRJ with different core materials aiming to develop qualified pipes to transport deepwater oil and gas, especially for the pre-salt reservoirs in offshore Brazil. SPs using SHCC material are easy to manufacture and cost-effective. Moreover, the composition of the SHCC material can be controlled to achieve structural requirements along with good thermal insulation. Investigation on the buckling under external pressure and feasibility of installation by reel-lay method is required. This study presents numerical analysis of the collapse, collapse propagation and bending of sandwich pipes with different geometries. The Drucker-Prager formulation is employed for SHCC constitutive model and it is calibrated through small-scale tests. Model geometries match full scale specimens manufactured and tested in bending apparatus and hyperbaric chamber. Numerical/experimental correlation is also presented.

Pressure capacity of sandwich pipe with cement-based core configuration under deep-water external pressure

“…[9] and Fu et al. [10] have conducted experimental and numerical studying on the collapse pressure of SP-filled lightweight cement-based material. Three SP samples were tested experimentally and numerically analyzed.…”

“…Fu et al. [10] performed the numerical analysis of collapse and collapse propagation of SPs with SHCC material core.…”

Finite difference model for the buckling analysis of sandwich pipes under external pressure

“…Similar to the studies of Sato and Patel (2007), Arjomandi and Taheri (2011), the present study accounts for shear deformation effects within the core, and for the presence of internal pressure. Fu et al (2014)…”

Local Buckling Characteristics of Stainless-Steel Polypropylene Deep-Sea Sandwich Pipe under Axial Tension and External Pressure

“…Researchers have conducted a large number of experiments to study the buckling propagation behavior of the sandwich pipe under external pressure. Pasqualino et al [20], Lourenco et al [21], Fu et al [22], Gong et al [23], and Gong et al [24] studied the effect of interlayer bonding on the buckling propagation pressure of sandwich pipes through small-scale experiments and numerical simulations and established empirical expressions through numerical simulations. Gong et al [25] studied the buckling propagation of sandwich tubes with integral buck arrestors under external pressure under different interfacial bonding conditions through high-pressure tank tests and found that interlayer bonding not only affects the collapse pressure but also has a great influence on the buckling propagation.…”