Aerospace

In addition to high stress and inertial force, aerospace materials also experience shock loads and alternating loads caused by factors such as takeoff and landing, engine vibration, high-speed rotation of rotating parts, maneuvering flight, and sudden winds. Engine gas and solar radiation cause the aircraft to be in a high temperature environment. As the flight speed increases, the aerodynamic heating effect is prominent, resulting in a "thermal barrier". In addition, it has to withstand alternating temperatures. When the stratosphere flies at subsonic speeds, the surface temperature will drop to about -50 ° C, the severe winter ambient temperature in the polar circle will be lower than -40 ° C, and metal components or rubber tires are prone to Embrittlement phenomenon. Gasoline, kerosene and other fuels, as well as various lubricants and hydraulic oils, mostly have a corrosive effect on metal materials and a swelling effect on non-metallic materials, while mold generated by solar radiation, wind and rain erosion, and long-term storage in underground humid environments will accelerate the aging process of polymer materials.