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This book covers the development of innovative computational methodologies for the simulation of steel material fracture under both monotonic and ultra-low-cycle fatigue. The main aspects are summarised as follows: i) Database of small and full-scale testing data covering the X52, X60, X65, X70 and X80 piping steel grades. Monotonic and ULCF tests of pipe components were performed (buckled and dented pipes, elbows and straight pipes). ii) New constitutive models for both monotonic and ULCF loading are proposed. Besides the Barcelona model, alternative approaches are presented such as the combined Bai-Wierzbicki-Ohata-Toyoda model. iii) Developed constitutive models are calibrated and validated using experimentally derived testing data. Guidelines for damage simulation are included. The book could be seen as a comprehensive repository of experimental results and numerical modeling on advanced methods dealing with Ultra Low Cycle Fatigue of Pipelines when subjected to high strain loading conditions.

Inhaltsverzeichnis

Frontmatter

Chapter 1. Introduction

Abstract
The need to transport gas from far way regions to the final market drives the pipeline industry to engineer new transportation options; mandatory steps are improving pipe materials as well as developing validated and reliable design criteria and quick construction solutions.
António Augusto Fernandes, Abílio M. P. de Jesus, Renato Natal Jorge

Chapter 2. Small-Scale Monotonic Test Data of Smooth and Notched Specimens

Abstract
This chapter presents results of small-scale monotonic tests performed with smooth and notched specimens made of various pipeline steels, covering medium to high strength steels and isotropic and anisotropic materials. Tension/compression, torsion and bending loads are explored. The materials investigated cover the API X52, X60, X65, X70 and X80 steel grades.
António Augusto Fernandes, Abílio M. P. de Jesus, Renato Natal Jorge

Chapter 3. Small-Scale Cyclic Test Data of Smooth and Notched Geometries

Abstract
This chapter presents results of small-scale cyclic tests performed with smooth and notched specimens made of various pipeline steels. Both LCF and ULCF behaviours will be investigated. The generated experimental data is used latter in plasticity/damage models calibration/validation which will be later used in finite element simulation of large-scale piping components made of similar materials.
António Augusto Fernandes, Abílio M. P. de Jesus, Renato Natal Jorge

Chapter 4. Large-Scale Monotonic Tests of Piping Components

Abstract
This chapter presents results of a testing programme of large-scale monotonic tests carried out on pipeline components manufactured with X52, X70 and X80 steel grades.
António Augusto Fernandes, Abílio M. P. de Jesus, Renato Natal Jorge

Chapter 5. Large-Scale Cyclic Tests of Piping Components

Abstract
This chapter presents results of a testing programme of large-scale cyclic tests carried out on pipeline components manufactured with X52, X60 and X65 steel grades. Those tests cover distinct loading scenarios and geometries and were performed until final failure.
António Augusto Fernandes, Abílio M. P. de Jesus, Renato Natal Jorge

Chapter 6. Constitutive Modelling for Plastic Monotonic and Cyclic Damage Behaviour

Abstract
Developments of constitutive modelling for plastic monotonic and cyclic damage behaviours are covered in this chapter.
António Augusto Fernandes, Abílio M. P. de Jesus, Renato Natal Jorge

Chapter 7. Simulation of Monotonic Full-Scale Tests

Abstract
This chapter presents the results of numerical simulations of monotonic large-scale tests described in Chap. 4, using constitutive models described in Chap. 6 and material properties identified with material (small-scale) test data obtained in Chap. 2.
António Augusto Fernandes, Abílio M. P. de Jesus, Renato Natal Jorge

Chapter 8. Simulation of Cyclic Full-Scale Tests

Abstract
This chapter presents results of numerical simulations of cyclic large-scale tests described in Chap. 5, using various constitutive models including some described in Chap. 6 and material properties identified with material (small-scale) test data obtained in Chaps. 2 and 3.
António Augusto Fernandes, Abílio M. P. de Jesus, Renato Natal Jorge

Chapter 9. Assessment Guidelines

Abstract
This chapter presents an overview of existing design procedures for the assessment of pipeline components undergoing monotonic and cyclic (ULCF) plastic damage conditions and comments on their limitations and suggestions for their possible update are proposed. This chapter covers more practical oriented guidelines for a strain based design of pipeline components under ULCF loading. Several existing design guidelines are assessed using ULCF data and comments for their improvement are presented.
António Augusto Fernandes, Abílio M. P. de Jesus, Renato Natal Jorge

Backmatter

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