Elastic buckling capacity of bonded and unbonded sandwich pipes under external hydrostatic pressure

Abstract

Sandwich pipes can be a potentially optimal system for use in deep-water applications. In recent years, there has been considerable interest in understanding the stability characteristics of these pipes under the governing loading conditions, with the aim of generating optimal design. External hydrostatic pressure is a critical loading condition that a submerged pipeline experiences during its installation and operational period.This article presents an analytical approach for estimating the bucking capacity of sandwich pipes with various structural configurations and core materials, subject to external hydrostatic pressure. The influence of adhesion between the core layer and inner or outer pipes is also a focus of this study. Beside the exact solution, two simplified equations are developed for estimating the buckling capacity of two configurations commonly used in practice. Details of both the exact and simplified analytical formulations are presented and the required parameters are defined. The efficiency and integrity of the proposed simplified solutions are compared with a solution developed by other researchers. A comprehensive series of finite element eigenvalue buckling analyses was also conducted to evaluate the accuracy and applicability of the proposed solutions.

A closed-form solution for the bending analysis of composite sandwich pipe with compliance core based on high-order sandwich theory

“…According to many researchers’ assumptions for soft and flexible core materials [7–11], the in-plane normal and shear stresses are presumed to be negligible. The assumption that the longitudinal and circumferential stresses are insignificant is correct, because its flexural rigidity and its modulus of elasticity are about two and three orders smaller than those of the skins, respectively [26].…”

“…[10] have studied the behavior of vibration of sandwich cylindrical shells covered by functionally graded coatings on a Pasternak elastic foundation. Arjomandi and Taheri [11] have studied influence of adhesion between the face sheets and core and elastic buckling capacity of bonded and unbounded sandwich pipes using an analytical approach under external hydrostatic pressure. Sofiyev et al.…”

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

“…Sato and Patel [12] also presented an exact analysis for predicting the elastic buckling behavior of an SP structure and developed a simplified solution for buckling capacity estimation. Arjomandi and Taheri [13] presented an analytical approach for estimating the elastic buckling capacity of SPs with different interface adhesion conditions under external hydrostatic pressure. Hashemian and Mohareb [14,15] developed a finite element eigenvalue buckling solution for the buckling analysis of SPs under internal and external uniform pressure.…”

Buckling analysis of sandwich orthotropic cylindrical shells by considering the geometrical imperfection in face sheets

“…In this work, the three dimensional elasticity solutions based on the Piola-Kirchhoff stress tensor have been used and the results have been compared against some other shell theories. Arjomandi and Taheri [2,3] have presented the analytical and finite element solutions for the buckling analysis of the sandwich pipes having various structural configurations and core materials under the action of external pressure. In these studies, the buckling behavior of the pipes has been investigated using a two-dimensional formulation in the polar coordinate system.…”