Effect of pre-crack in the fracture properties of steel pipes used in oil type API 5L X70
| Autor: | João Roberto Sartori Moreno, Julio Cesar Sousa Francisco, Cassio O. F. T. Ruchert, Waldek W. B. Filho |
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| Rok vydání: | 2016 |
| Předmět: |
0209 industrial biotechnology
Materials science MECÂNICA DA FRATURA Aerospace Engineering 02 engineering and technology Crack growth resistance curve Industrial and Manufacturing Engineering Crack closure 020901 industrial engineering & automation Fracture toughness 0203 mechanical engineering mental disorders Composite material Plane stress business.industry Mechanical Engineering Applied Mathematics Delamination General Engineering Fracture mechanics Structural engineering 020303 mechanical engineering & transports Automotive Engineering Fracture (geology) business Displacement (fluid) |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| Popis: | In this work, we studied the impact resistance of the weld metal of a steel API 5L X70, assessing the influence of geometry and dimensions of the specimen fracture toughness. Curves resistance to crack propagation ductile (J–R) following the methodology “Single Specimen” together with the variation of the elastically generated by the crack initiation (CMOD) providing a load versus displacement/length graph for crack (ASTM E1820-05). Tests were conducted on samples according to the standard SE(T) to surface cracks (a/W = 0.2) and deep (a/W = 0.5) and the ratios W/B = 1.0 and 2.5, keeping the plane strain. The results show that regardless of initial crack dimension, no significant differences were observed in the curves J–R, confirming the similarity of the curves for W/B = 1.0 for any a/W. However, most of the samples showed anomalous ductile crack growth, generating high plane stress along the sides of the notches. Samples tested according to the J–R curve showed no cracks of encapsulating, and the values of the crack length a i and a f are very close to those obtained by the elastic flexibility variation method. Since delamination influenced the properties of impact for increased efforts to crack propagation, mainly by microstructural conditions of the samples. |
| Databáze: | OpenAIRE |
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