Ductile Crack Growth
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Microstructure and mechanical properties of two Api steels for iron ore pipelines
This research compares the mechanical behavior of two API steels (X60 and X70) used in the longest pipeline in the world for the conveyance of iron ore. Tensile tests, Charpy impact tests, CTOD tests and fatigue crack growth tests are performed at ambient temperature. Metallographic examination showed a banded microstructure consisting of polygonal ferrite a
Mat. Res.. Publicado em: 27/05/2014
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2. Comportamento à fratura de defeitos circunferenciais em dutos submarinos instalados por bobinamento
This study aims to evaluate the limit of the fracture instability for submarine pipelines installed by the Reeling Method, determining the maximum allowable ductile tearing for use in analysis of structural integrity through correlations with SENT specimens (Single Edge Notched Tension). The Standard DNV-RP-F108, which gives guidance to testing and analysis
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2009
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3. Nonlinear boundary element models to analyse fracture problems and reliability/optimization models applied to structures submitted to fatigue / Modelos não lineares do método dos elementos de contorno para análise de problemas de fratura e aplicação de modelos de confiabilidade e otimização em estruturas submetidas à fadiga
This work deals with the development of boundary element method (BEM) formulations to be used in engineering problems. Particular attention is given to using these formulations in development of reliability and optimization models applied to fatigue problems. Contributions to BEM formulations are developed, particularly, models that deal with crack growth in
Publicado em: 2009
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4. Fracture mechanics methods applied to medium density polyethylene designed for extrusion of pipes. / Métodos de mecânica da fratura aplicados a polietileno de média densidade destinado à extrusão de tubos.
Medium density polyethylene (MDPE) is a semicrystalline thermoplastic polymer that has been increasingly used in engineering applications, as plastic pipes for water and gas distribution systems. Under constant load, however, this material may occasionally present creep failure, by means of a mechanism of slow crack growth, leading to leakage losses in the s
Publicado em: 2009
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5. Avaliação numérica do comportamento à fratura de um protótipo de vaso de pressão de reator PWR submetido a choque térmico pressurizado / Numerical evaluation of the fracture behavior of a PWR reactor pressure vessel prototype under pressurized thermal shock
In the primary system of a pressurized water reactor (PWR) nuclear power plant, the reactor coolant is kept at internal temperature around 300 C and internal pressure in the order of 15,0 MPa, during normal operation. The reactor pressure vessel (RPV) contains the fuel assemblies and is considered the most important component of the reactor primary system. T
Publicado em: 2005
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6. Development of alternative methods to the assessment of the creep fracture resistance of polyethylene resins used for the extrusion of water pipes. / Desenvolvimento de métodos alternativos para a avaliação da resistência à fratura por fluência de resinas de polietileno utilizadas para a extrusão de tubos de água.
Polyethylene has been largely used in potable water distribution systems, mainly in service lines. This polymer offers many advantages over its competitors: flexibility, low cost, ease installation and corrosion resistance. Pipes made with high density polyethylene HDPE, the generic designation of the material in the sanitation industry in Brazil fail
Publicado em: 2005
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7. Investigação experimental do comportamento dúctil de aços API-X70 e aplicação de curvas de resistência J-∆a para previsão de colapso em dutos. / Experimental analysis of ductile behaviour of API-X70 steels and use of resistance J-∆a curves for predicting pressure collapse of pipelines.
This study presents the experimental investigation of the ductile behaviour of microalloyed pipeline steel. Additionally, it extends the computational cell methodology to model Mode I crack extension in a high strength low alloy HSLA steel. Laboratory testing of an API 5L X70 steel at room temperature using standard, deep crack C(T) specimens provides the cr
Publicado em: 2004
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8. Experimental investigation of ductile crack growth in an API 5L X80 pipeline steel using J-R curves. / Caracterização das propriedades mecânicas e metalúrgicas do aço API 5L X 80 e determinação experimental de curvas J-R para avaliação da tenacidade a fratura.
Caracterizar propriedades de resistência à propagação de trinca em materiais dúcteis é um elemento central em métodos de avaliação de integridade estrutural de dutos destinados ao transporte de gás, petróleo e seus derivados que utilizam os aços ARBL. Sendo assim, o objetivo deste trabalho foi estudar as propriedades de fratura dúctil do aço AP
Publicado em: 2004
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9. Influência da austenita retida no crescimento de trincas curtas superficiais por fadiga em camada cementada de aço SAE 8620 / The influence of retained austenite on short fatigue crack growth in case carburized SAE 8620 steel
The retained austenite is always present in case carburized steel microstructure in small or high percentages. Since it is a ductile phase, its presence has long been a controversial subject. The influence of retained austenite on short fatigue crack propagation in case carburized SAE 8620 steel was studied in this work. Four-point-bend fatigue tests were ca
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/10/1997