Experimental investigation of mechanical and fracture properties of offshore wind monopile weldments: SLIC interlaboratory test results

Mehmanparast, Ali; Taylor, Jessica; Tavares, Isaac

doi:10.1111/ffe.12850

Cited by 31 publications

(30 citation statements)

References 39 publications

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“…The effectiveness of these methods was determined on the basis of the strength uniformity approach of structural elements with a crack, repaired by such methods and other structural elements made of the same material, operating under similar conditions, containing structural or technological stress concentrators permitted by the standards [1].…”

Section: Criteria and Methods For Assessing The Performance Of Structmentioning

confidence: 99%

“…The cracking is explained in most cases not by the high level of stress macroconcentration (except for the presence of hard points) as much as by the combination of macroconcentration with microconcentration (technological concentration reflected by the effective concentration ratio) and such adverse factors as poor quality steel, low temperature, dynamic loads, etc. [1,[11][12][13][14][15][16][17][18][19][20][21][22]].…”

Section: Criteria and Methods For Assessing The Performance Of Structmentioning

confidence: 99%

“…The fatigue tests of specimens of machine steel [1] have shown that the processing of the reamer holes made at the crack tips allows, at a moderate level of nominal stresses, to eliminate almost completely the effect of microconcentration.…”

Section: Calculation Schemesmentioning

confidence: 99%

“…The use of fracture mechanics to assess the performance of machine-building structures made it possible to proceed to the normalization of various parameters characterizing the crack resistance of the material [1][2][3][4][5][6][7][8][9]. This made it possible to choose material in terms of preventing crack formation.…”

Section: Introductionmentioning

confidence: 99%

“…In [1], the crack resistance of drive elements of wind turbine was investigated. Impact tests, chemical analysis, hardness tests, tensile tests, and fracture toughness tests were performed on specimens taken out of the three microstructures of the material.…”

Section: Introductionmentioning

confidence: 99%

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Performance assurance of mechanical engineering construction in the existence of cracks

2019

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The purpose of this paper is to consider the development of engineering ways of preventing the further development of through cracks in the sheet elements of the complex technical structures. The latest individual approach to the assessment and assurance of performance of structures with cracks, which is to take into account the features of their operation, has been applied in this work. Preference is given to methods that reduce the concentration in the danger zone. Studies have shown that the most appropriate and effective ways to prevent the further development of a through crack are the structural methods and combinations of the structural and technological methods. The effectiveness of these methods was determined on the basis of the strength uniformity approach of structural elements with a crack. The criterion of strength uniformity from the position of fatigue and brittle strength with an error on the safe side is the value of theoretical stress concentration factor ] [K . The ] [K value was made on the basis of generalization and analysis of cases of crack formation, the results of tests of typical components of hull structures and welded joints. The safe concentration of stresses near the holes of various purposes in the members of the machine-building structures is in the range from 2 to 4. Taking into account the relevant requirements for the ratio of the radius of curvature and the width of the cutout, we obtain 3.5. The value of the criterion К1 is determined by the ratio of the calculated crack length to the diameter of the hole drilled at its ends and the location of the crack.

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Section: Criteria and Methods For Assessing The Performance Of Structmentioning

confidence: 99%

Section: Criteria and Methods For Assessing The Performance Of Structmentioning

confidence: 99%

Section: Calculation Schemesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Performance assurance of mechanical engineering construction in the existence of cracks

2019

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Improvements in the fatigue design of support structures for offshore wind turbines

2021

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Extended keynote paper of Eurosteel 2021 This article provides an overview of the various support structures for offshore wind turbines and addresses the challenges that arise for the different design variants. First of all, the existing types of support structures are explained and their benefits and shortcomings discussed. Following that, the focus is on material fatigue and its analysis, which is of great importance due to the cyclic loading on the structures. A central topic of this article is the experimental evaluation of fatigue strength using large‐scale test setups and state‐of‐the‐art measurement methods. Critical and complex design details such as welds for extremely thick plates, tubular joints, grouted connections, large HV bolts and ring flanges are investigated to improve methods of analysis. Further, the new series of German standards (DIN 18088) for support structures for wind energy turbines and platforms is addressed. Finally, these topics are summarized and the importance of offshore wind energy for the transition to cleaner energy is emphasized.

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Structural reliability assessment of offshore wind turbine support structures subjected to pitting corrosion‐fatigue: A damage tolerance modelling approach

et al. 2020

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The structural integrity of offshore wind turbine (OWT) support structures is affected by one of the most severe damage mechanisms known as pitting corrosion-fatigue. In this study, the structural reliability of such structures subjected to pitting corrosion-fatigue is assessed using a damage tolerance modelling approach. A probabilistic model that ascertains the reliability of the structure is presented, incorporating the randomness in cyclic load and corrosive environment as well as uncertainties in shape factor, pit size and aspect ratio. A non-intrusive formulation is proposed consisting of a sequence of steps. First, a stochastic parametric Finite Element Analysis (FEA) is performed using SMART© crack growth and Design Xplorer© facilities within the software package ANSYS. Secondly, the results obtained from the FEA are processed using an Artificial Neural Network (ANN) response surface modelling technique. Finally, the First Order Reliability Method (FORM) is used to calculate the reliability indices of components. The results reveal that for the inherent stochastic conditions, the structure becomes unsafe after the 18th year, before the attainment of the design life of 20 years. The FEA results are in very good agreement with results obtained from analysis steps outlined in design standard BS 7910 and other references designated as 'theoretical analysis methods' in this study. The results predict, for the case study, that the pit growth life is approximately 56% of the total pitting corrosion fatigue life. Sensitivity analysis results show that the aspect ratio of pits at critical size plays a significant role on the reliability of the structure.

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Experimental investigation of mechanical and fracture properties of offshore wind monopile weldments: SLIC interlaboratory test results

Cited by 31 publications

References 39 publications

Performance assurance of mechanical engineering construction in the existence of cracks

Performance assurance of mechanical engineering construction in the existence of cracks

Improvements in the fatigue design of support structures for offshore wind turbines

Structural reliability assessment of offshore wind turbine support structures subjected to pitting corrosion‐fatigue: A damage tolerance modelling approach

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