Creep Analysis of Aluminum Alloy Disk Experiment for High Speed Energy Storage Flywheel

In order to achieve higher speed and higher energy density, aero aluminum alloy and carbon fiber are used in building the Flywheel Energy Storage System (FESS). When FESS’s energy is stored in or released out quickly, the system temperature would notably rise up. To the aluminum alloy part of the rotor, thermal creep effect in this high temperature environment has to be carefully considered. Even though the temperature rising does not often occur, it will definitely depresses the FESS’s operating lifetime and reliability. Through a special experiment device, this creep phenomenon could be observed and the creep deformation could be obtained as well. This paper discusses a computer simulation of this aluminum alloy creep performance, by using the traditional creep model and Nonlinear Finite Element Analysis (solved in ANSYS). The simulation result can not only well repeat the experimental result, it can also simulate the unmeasured structure stress redistribution under creep effect. This creep analysis has a very important contribution to the further research of FESS’s optimum design, reliability design and its lifetime estimation.

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