Simulation Study On Mechanical Properties Of Fiber/Epoxy Composites Rotor

Compared with the traditional energy storage method,the flywheel energy storage device has many advantages such as high energy efficiency,fast charge-discharge response and wide range of application.The flywheel rotor,as a key part of the whole energy storage system,has a direct impact on its performance energy storage density and energy storage scale.However,the transverse strength of the composite restricts the speed limit of the flywheel rotor.Therefore,the study on the mechanical properties of the flywheel rotor has important guiding significance for the application of flywheel energy storage.In this paper,we use the finite element simulation software Abaqus / CAE and DIGIMAT in combination with the meso-mechanics to establish two-dimensional transverse meso-model and three-dimensional characteristic voxel model of glass fiber composite respectively,and analyze the transverse performance.The performance of the three-dimensional feature element model of glass fiber,T300 fiber and T800 fiber composite is estimated.Combined with the Whitney-Riley model,the composite material properties of different fiber volume fractions are calculated.Based on the measured fiber composite performance parameters,the influence of wheel hub and wheel rim materials,the wheel hub position and the wheel rim length on the stress of the rotor is analyzed.The Limiting speed of the flywheel of different materials is measured.The different flywheels are modeled to evaluate the vibration characteristics.According to the actual engineering requirements to select the optimal program for the composite rotor engineering application,to provide a theoretical basis and guiding role.By analyzing the transverse strength of the glass fiber composites,it is found that the transverse tensile strength value is 38.6 MPa,and the error is 4.8% compared with the reference experimental data of 40 MPa.Calculating the rotational speed of the rims of different materials,we found that the limiting speed of the fiberglass composite rotor is about 4500 rpm,the limiting speed of the T300 carbon fiber composite rotor is about 8300 rpm,and the limiting speed of the T800 fiber composite material is about 11,000 rpm.T300/T800 The limit speed is approximately 9300 rpm.The effects of the rim material,the rim length and the hub position on the natural frequency of the rotor were studied and analyzed.It was found that the length of the rim has the greatest influence on the natural frequency of the rotor,and the minimum natural frequency of the rotor corresponds to the rotational speed of the rim with a rim length of 740 mm and this paper.The preset speed of 10,000 rpm is very close,and the T800 fiber composite rim with a rim length of 1500 mm will not resonate at 10,000 rpm.