Perturbation Analysis of Instability for Non-uniform Cylindrical Shells with Initial Imperfection
会议名称：《2011 Chinese Control and Decision Conference（CCDC）》
会议日期：2011年
学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）]
基 金：supported by Guangdong National Nature Science Foundation under Grant 5300452
关 键 词：Perturbation Analysis Location of Plastic Hinge Corroded Pipeline Buckle Propagation
摘 要：Buckle propagation in subsea corroded pipelines is one of the most concerned problems in offshore industries,while locating the plastic hinges in the corroded pipeline is the crux in determining the buckle propagation *** paper presents a methodology to determine the locations of plastic hinges in non-uniform shells subjected to external *** non-uniform shell used to model the corroded pipeline has two Regions:Region 1 of reduced,inconstant thickness and Region 2 of nominal *** formulas for the bifurcation load,radial deformation,initial yield pressure and stress distribution in the non-uniform shell are derived from perturbation analysis using WKB *** locations of plastic hinges are identified at the stress peaks by taking the derivative of the stress with respect to circumferential *** sensitivity of the non-uniform shell is assessed with an emphasis on the role of initial yield pressure and the locations of plastic *** case when the thickness of Region 2 is constantly reduced is *** is found that both the initial yield pressure and the locations of plastic hinges depend on the non-uniform conditions of the cylindrical shell.