Mehdi Ezzati

Mehdi Ezzati
Babol Noshirvani University of Technology | NIT · Faculty of Civil Engineering

PhD

About

11
Publications
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178
Citations

Publications

Publications (11)
Article
Repair welds are frequently used to fix defects in the manufacturing process, remedy in-service degradations, and for the life extension of ageing steel components and pressure vessels. Nevertheless, repair welds may exert detrimental impacts on the integrity of these structures in the long term. The primary focus of the current study is on the vee...
Article
This paper presents the results of an experimental study in which for the first time the progressive inelastic deformation of high strength steel pressurized pipes with plain and gouged dents was analyzed. The effect of some key loading and geometrical parameters such as initial pre-strain (εmon), dent depth ratio (δ/D) and the presence of the goug...
Conference Paper
Full-text available
The Gulf of Oman offers the only entrance from the Arabian Sea and the Indian Ocean into the Persian Gulf and is affected by the climate and hydrodynamic processes of this ocean. Makran Coast plays an important role in country's future navigation and trade due to its accessibility. The Oman Sea is located in the northern margin of tropical climate...
Article
A B S T R A C T In this study, indentation responses of high strength steel pipe with local wall thinning (gouge) under internal pressure have been studied through experimental procedure and numerical analysis. The experimental study was carried out on laboratory scale specimens from API 5 L X80 steel. Dent produced by a hemi-spherical indenter wit...
Article
Full-text available
Metallic tubes experiences a progressive accumulation of ovalisation, or ratchet, under cyclic inelastic bending. The current paper deals with the ratcheting behaviour of defective small-scale API X80 carbon steel tubes subjected to cyclic bending. The subject appears not to have received due previous attentions but is important in the design and m...
Article
High strength steel pipes have found increasing applications in deep high pressure offshore oil/gas lines. Damages in the form of dent are among common causes of pipeline failure. Indentation, plastic buckling and residual strength of dented normal grade steel pipes under bending, axial and combined loading have previously been addressed by a numbe...
Article
Full-text available
In the current study a numerical simulation approach has been chosen to simulate the force-deflection response of tubular member under lateral impact in the absence of internal pressure or axial force and the results have then been compared with analytical relations. Two series small scale experiments were carried out by the authors on X70 steel tu...
Article
Full-text available
In practice, steel tubulars lack a mathematically perfect cylindrical shape, due to nonuniformities introduced during the manufacturing process, construction methods, damages incurred in the transport. The imperfections might exist in the cross section and along the tubular member. Imperfections can greatly affect the behavior of tubular members. T...

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