基于全塑性解的周向开裂钢管的J积分和CTOD评估方法 Mario S. G. Chiodo Claudio Ruggieri MARINTEK do Brasil Dept. of Naval Architecture and Ocean Rio de Janeiro, RJ, 22290-160, Brazil Engineering mario.chiodo@sintef.no University of So Paulo So Paulo, SP 05508900, Brazil claudio.ruggieri@usp.br
ABSTRACT
This work provides an estimation procedure to determine the Jintegral and CTOD for pipes with circumferential surface cracks subjected to bending load for a wide range of crack geometries and material (hardening) based upon fully-plastic solutions. A summary of the methodology upon which J and CTOD are derived sets the necessary framework to determine nondimensional functions h1 and h2 applicable to a wide range of crack geometries and material properties characteristic of structural, pressure vessel and pipeline steels. The extensive nonlinear, 3-D numerical analyses provide a large set of solutions for J and CTOD which enters directly into fitness-for-service (FFS) analyses and defect assessment procedures of cracked pipes and cylinders subjected to bending load.
IPC2010-31071
RESEARCH AND PROSPECT ON RELATIONSHIP BETWEEN MICROSTRUCTURE CHARACTERISTICS AND STRENGTH-TOUGHNESS OF HIGH GRADE PIPELINE STEEL
对高钢级管线钢微观结构特征和强韧性之间关系的研究和预测 Tong Ke Zhuang Chuanjing Tubular Goods Resarch Center of CNPC, Tubular Goods Resarch Center of CNPC, Xi'an, China Xi'an, China He Xiaodong Han Xinli Song Juan Tubular Goods Resarch Tubular Goods Resarch Tubular Goods Resarch Center of CNPC, Xi'an, Center of CNPC, Xi'an, Center of CNPC, Xi'an, China China China
ABSTRACT The strength property of high grade pipeline steel has been obviously improved with the rapid development of the constructing of oil and gas pipelines. And the excellent strength-toughness matching of pipeline steel is very important. The major affecting factor on strength-toughness of pipeline steel is microstructure characteristic. In this paper, the research status of pipeline steel microstructure characteristic including effective grain size, non-metallic inclusions and banded structure is summarized at home and abroad. In addition, the shortcomings of former research on the relationship between microstructure characteristics and strength-toughness are also analyzed for this pipeline steel. On this basis, a solution is put forward to investigate the characterization of effective grain size and micro-mechanical behavior of inclusions and banded structure with the method of electron backscatter diffraction and the method of SEM in situ observation. And the necessities and feasibilities of the solution are discussed.

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