Ali Mehmanparast
Cranfield University
Ultimate tensile strengthFinite element methodCreepComposite materialMetallurgyMaterials scienceWeldingMarine engineeringTension (physics)TurbineResidual stressFracture (geology)Fracture mechanicsDuctilityStructural engineeringParis' lawCrack closureOffshore wind powerStress (mechanics)Fracture toughness
95Publications
15H-index
883Citations
Publications 96
Newest
Abstract null null This paper investigates from a structural reliability assessment (SRA) perspective the fatigue reliability using the S-N curve approach compared with the fracture mechanics (FM) approach for a typical welded offshore wind turbine (OWT) jacket support structure. A non-intrusive formulation was developed for an OWT jacket support structure in 50 m deep water, consisting of a sequence of steps. First, stochastic parametric 3D (three-dimensional) Finite Element Analysis (FEA) simu...
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#1Satya Anandavijayan (Cranfield University)H-Index: 1
#2Ali Mehmanparast (Cranfield University)H-Index: 15
Last. Amir Chahardehi (Atkins)H-Index: 5
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Abstract A commonly used material in offshore structures is S355 structural steel. For example, during the monopile fabrication process, the material is pre-strained to different levels at different depths through the thickness. Therefore, the influence of pre-straining on fatigue life and crack growth behaviour of the material needs to be examined and considered for design and life assessment procedures. In the present study, uniaxial fatigue and fatigue crack growth tests have been conducted o...
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#1Jessica Taylor (Cranfield University)H-Index: 3
#2Ali Mehmanparast (Cranfield University)H-Index: 15
Last. Li Xu (Lloyd's Register)H-Index: 1
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Abstract It is vitally important to measure the brittle crack arrest properties of shipbuilding steels to ensure that accidental damage will not result in total structural failure. Wide-plate test methods allow for direct measurement of the crack arrest toughness but this kind of testing is incredibly expensive. Therefore, there is a need for cheaper and simpler test methods which are able to measure a material’s brittle crack arrest toughness. In this work, Compact Crack Arrest (CCA) testing, w...
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#1Satya Anandavijayan (Cranfield University)H-Index: 1
#2Ali Mehmanparast (Cranfield University)H-Index: 15
Last. Amir Chahardehi (Atkins)H-Index: 5
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Abstract null null S355 structural steel is a commonly used material in the fabrication of foundation structures of offshore wind turbines, which are predominantly supported using monopiles. During the manufacturing process of monopile foundations, S355 steel plates are pre-strained via a three point bending and rolling process, which subsequently changes the mechanical, fatigue and fracture properties of the material. The aim of this study is to investigate the variation in fracture toughness o...
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#1Anna Ermakova (Cranfield University)H-Index: 3
#2Ali Mehmanparast (Cranfield University)H-Index: 15
Last. Filippo Berto (NTNU: Norwegian University of Science and Technology)H-Index: 68
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The new emerging Wire and Arc Additive Manufacturing (WAAM) technology has significant potential to improve material design and efficiency for structural components as well as reducing manufacturing costs. Due to repeated and periodic melting, solidification and reheating of the layers, the WAAM deposition technique results in some elastic, plastic and viscous deformations that can affect material degradation and crack propagation behaviour in additively manufactured components. Therefore, it is...
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#1Ali Mehmanparast (Cranfield University)H-Index: 15
#2Azenor Vidament (Cranfield University)
Abstract Offshore wind turbines are subjected to cyclic loading conditions during their operational lifespan which is typically between 20 and 25 years. An important issue in fatigue design and integrity assessment of offshore wind turbine foundations is the examination of the long-term fatigue and corrosion-fatigue behaviour of steel structures in the high cycle region. High cycle fatigue tests, particularly at low frequencies in a seawater environment, are time-consuming and costly. Therefore,...
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#2Anna ErmakovaH-Index: 3
Last. Ali MehmanparastH-Index: 15
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The aim of this study is to look into the current information surrounding decommissioning and life extension strategies in the offshore wind sector and critically assess them to make informed decisions upon completion of the initial design life in offshore wind farms. This was done through a two-pronged approach by looking into the technical aspects through comprehensive discussions with industrial specialists in the field and also looking into similar but more mature industries such as the Offs...
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#1Haoliang ZhouH-Index: 2
#2Ali MehmanparastH-Index: 15
Last. Kamran NikbinH-Index: 26
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Reheat cracking in an ex-service Type 316H stainless steel steam header component has been investigated in this study. The examined steam header was in service for 87,790h and the cracks in this co...
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