When the high speed train is in operation

the roof silicon rubber composite insulator umbrella skirt has a tearing problem in the long-term high-speed sand environment.To study the cause of roof insulator tearing

and the stress and deformation characteristics of umbrella skirt in strong wind and sand-dust environment

based on the fluidstructure interaction（FSI） method

calculate the wind pressure distribution on roof insulator surface

research the influence of wind speed and wind angle on the stress and deformation characteristics of the roof insulator.Results show the wind pressure difference between the positive and negative wind pressure zone produces a larger resultant force acting on the umbrella skirt

resulting in deformation of the umbrella skirt.The greater the wind pressure difference on the skirt surface

the greater the deformation of the umbrella skirt.The stress concentration phenomenon appears at the root of umbrella skirt.The life at the root of the umbrella skirt is obviously lower than that of the other part of the umbrella skirt under the action of repeated external force.Under different wind angles

the shape variables of umbrella skirt edges are obviously different.As the wind speed increases from 60 m/s to 100 m/s

the maximum shape variable of umbrella skirt increases from 6.773 2 mm to 18.561 mm

and the maximum stress at the root of umbrella skirt increases from 0.180 56 MPa to 0.496 98 MPa.At the same time

the structure

angel of sheds and diameter of the umbrella skirt significantly affect the wind-resistant performance of the insulators at the same time.