Projekt

Wind turbine bolts

Udbyder

Vejleder

Sted

København og omegn

Background

In order for wind power to compete without subsidies against other cheaper energy sources such as coal, a higher reliability is needed for lowering downtime and maintenance expenses. Bolted joints are one of the critical issues for wind turbines, while relatively simple and inexpensive components in themselves, regular inspections and replacement procedures are expensive. Although designed to last throughout the design lifetime of the turbine, replacements of bolts are quite common and constitute a considerable portion of the maintenance expenses. This project will deal the effect of surface cracks on bolt failure in wind turbines. The results obtained from this investigation can play a significant role in improving bolt lifetime in future wind turbine designs and therefore help to reduce cost of energy.

Content

The main aim of this project is to investigate surface cracks and defects of failed galvanized large bolts (M30-M64) that have been tested at a major wind turbine manufacturer. Surface defects have a significant effect on the fatigue properties of bolts. While hot-dip galvanization is commonly used to effectively protect bolts from corrosion, hot-dip galvanization is renowned for introducing microcracks in the surface, which diminishes the fatigue life. Therefore, crack size and crack distribution will be investigated as a function of bolt size, load magnitude and level of bending during testing. Light optical microscopy, scanning electron microscopy and potentially 3D techniques will be used for identifying and characterizing defects with a particular emphasis on surface micro-cracks.

More specific goals will be defined between the student and the supervisor, depending on the specific research interests of the student. The project can be carried out in collaboration with a major wind turbine manufacturer, depending on the specific goals.

Forudsætninger

Some background in material science and/or mechanical engineering.

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Kontakt

Virksomhed/organisation

DTU Vindenergi

Navn

Hilmar Kjartansson Danielsen

Stilling

Seniorforsker

Mail

hkda@dtu.dk

Vejleder-info

Kandidatuddannelsen i Vindenergi

Vejleder

Hilmar Kjartansson Danielsen

ECTS-point

15 - 45

Type

Afgangsprojekt, Bachelorprojekt, Kandidatspeciale, Specialkursus

OM DTU

DTU er et teknisk eliteuniversitet med international rækkevidde og standard. Vores mission er at udvikle og nyttiggøre naturvidenskab og teknisk videnskab til gavn for samfundet. 10.000 studerende uddanner sig her til fremtiden, og 5.700 medarbejdere har hver dag fokus på uddannelse, forskning, myndighedsrådgivning og innovation, som bidrager til øget vækst og velfærd.

Find os her

Anker Engelunds Vej 1
Bygning 101A
2800 Kgs. Lyngby


45 25 25 25

dtu@dtu.dk

CVR-nr. 30 06 09 46

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