This competition is supported by a project funded by the U.S. Department of Energy to assess and improve concrete compression fatigue models. The project is led by Tufts University, and the project participants and advisors include the University of Illinois, DNV GL, the Leibniz University of Hanover, Olav Olsen, Seatower, Bintong Engineering, and Wind Tower Technologies. The motivation for this research project and competition are that the design of wind turbine support structures can be controlled by Fatigue Limit State (FLS) considerations, and that the fatigue capacity (number of permissible cycles for a particular stress range) by one model (or code) can vary from another by an order of magnitude. Participation in this competition would be greatly appreciated, and it will help assess the maturity of the design models and identify where additional work is needed. As with most such competitions, the names of participants will not be associated with their specific predictions. Those whose predictions are closest to what was measured will be asked if they wish to have their names associated with their predictions. The due date for submissions is 8 June 2022. For more information, please download “Competition Invitation.pdf” file and other supporting documents.