W. R. Tyson

Material Selection for Fracture Control

W. R. Tyson

To prevent fracture, pipeline material must be sufficiently tough. This chapter discusses the properties defining fracture resistance and their measurement: Charpy absorbed energy (notch toughness), stress intensity factor (fracture toughness), J -integral, crack-tip opening displacement, and crack-tip opening angle. Methods to specify …

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Characterization of CTOA for resistance to pipeline ductile fracture propagation

Su Xu, Chris Bassindale, Xin Wang, W. R. Tyson

In the present paper, the crack-tip opening angle (CTOA) data used by Jiao et al. are assessed to show that the CTOA-fracture speed data were in transient regions of different types of drop-weight tear test (DWTT) specimens but not in steady-state fracture …

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Challenges in Mechanical Performance of Materials in SCWR

Faramarz Zarandi, W. R. Tyson

The Super Critical Water-cooled Reactor (SCWR) system is a high temperature, high pressure water-cooled reactor that operates above the thermodynamic critical point of water. This aggressive environment, together with irradiation, decreases the mechanical stability of the construction materials. Although materials for light …

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Prediction of Ductile Fracture Arrest in Natural Gas Pipelines Using the Crack Tip Opening Angle

Chris Bassindale, Xin Wang, W. R. Tyson, Su Xu

Abstract In this paper, an analytical equation is developed to predict fracture arrest CTOA requirements for gas pipelines pressurized with natural gas that undergo single phase decompression using finite element (FE) analysis. The FE model is briefly reviewed. Dynamic pipe fracture simulations …

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Effect of Orientation on CVN and K-CVN Toughness Correlation of SAW Pipe Seam Welds

Xu Su, Jie Liang, Cheng Qian, W. R. Tyson

Abstract Charpy absorbed energy (CVN), and fracture toughness (stress intensity factor K) using single-edge notched bend (SE(B)) specimens, were measured for submerged-arc welded (SAW) pipe seam welds using two typical two-pass seam welds. Because the intent is to derive K values for …

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Characterization of CTOA for Resistance to Pipeline Ductile Fracture Propagation

Su Xu, Chris Bassindale, Xin Wang, W. R. Tyson

Engineering Approach for Ductile Fracture Arrest Based on CTOA

Su Xu, Chris Bassindale, Xin Wang, Bruce W. Williams et autres

Abstract Ductile fracture propagation control and arrest are important elements in fracture control of pipelines transporting natural gas and other high-vapour-pressure media (e.g., dense-phase carbon dioxide). The most familiar crack arrest methodology, the Battelle Two-Curve Method (BTCM), is based on Charpy absorbed …

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Development of CTOA Requirements for Ductile Fracture Arrest in Gas Pipelines: FE Model and Simulations

Chris Bassindale, Xin Wang, W. R. Tyson, Xu Su

Abstract In this paper, an engineering analysis approach is presented to predict fracture arrest CTOA requirements for gas pipelines using finite element (FE) analysis. A model with constant CTOA as fracture criterion was developed using the commercial FE code ABAQUS 2017x-explicit. Dynamic …

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Modeling the effect of backfill on dynamic fracture propagation in steel pipelines

Chris Bassindale, Xin Wang, W. R. Tyson, Su Xu

In this paper, dynamic ductile fracture propagation simulations were conducted to study the use of smoothed particle hydrodynamics (SPH) for modeling the effects of backfill in pipeline burst simulations. The effect of SPH parameters on fracture velocity was studied using the Battelle …

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Analysis of dynamic fracture propagation in steel pipes using a shell-based constant-CTOA fracture model

Chris Bassindale, Xin Wang, W. R. Tyson, Su Xu

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Damage Model Prediction of Crack Initiation and Propagation in Five Fracture Geometries for X80 Pipeline Steel

Bruce W. Williams, Jia Xue, Su Xu, Dong-Yeob Park et autres

Abstract Test specimens used to calibrate damage-mechanics models are designed to produce a range of stress triaxialities and Lode angles to accurately capture the fracture envelope of the metal. Many of these specimens have lower constraint than deeply notched fracture specimens that …

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Analysis of full-scale burst tests by FE modelling using constant CTOA fracture criterion

Chris Bassindale, Xin Wang, W. R. Tyson, Su Xu et autres

Several backfilled full-scale burst tests were recently performed by TC Energy on CSA Z245.1 Grade 550 Category II pipe steels. This paper presents a new interpretation of the recent full scale burst test data using the crack tip opening angle (CTOA) as …

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