Abstract
This paper discusses the quality of common methods for estimating the fatigue strength of EN-GJS-400-18-LT specimens under multiaxial stress. This is particularly important for the lightweight design of wind turbines. Experimental fatigue tests with axial, torsional and combined loads with a load ratio of R = -1 were performed. The results of these fatigue tests are used to validate commonly used multi-axial stress hypotheses. The investigated methods are the von Mises hypothesis, the Findley-criterion, the modified Gough-Pollard method and the critical plane nominal stress hypothesis.
Highlights
Due to the growing demand for regenerative energy production, developments in wind energy technology are leading to more powerful wind turbines and increasing turbine sizes [1]
Since for cyclically loaded large components an experimental fatigue strength verification can only be performed with economically unacceptable effort, the calculated fatigue life estimation based on available or easy to determine methods is of central importance
The following stress-based multiaxial methods are investigated: The von Mises hypothesis, the Findley criterion [6], as well as the modified Gough-Pollard method recommended in Eurocode 3 [7] and the critical plane normal stress hypothesis referred to in DNV GL [8] for the given material EN-GJS-400-18-LT
Summary
Due to the growing demand for regenerative energy production, developments in wind energy technology are leading to more powerful wind turbines and increasing turbine sizes [1]. For their realization, an improved utilization of the lightweight design potential is essential, taking into account the required component strength and reliability. The fatigue life under combined loads depends to a great extent on the locally available material properties, especially the toughness. It is not known how the ductile EN-GJS-400, which is widely used in wind turbine construction, will behave under non-proportional multiaxial stresses. The results of the individual methods are validated using the results of the fatigue tests with combined loading
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call