Vibration Analysis of FGM Structure under Hygrothermal Effect using DQ Method

Abstract

The axially functionally graded material (AFGM) beam plays an important role in the light- newlineweight design of an air-foil structure in the aerospace industry. Specifically, the wing root can newlinebe made in high elasticity modulus and mass density materials such as alloy steel to enhance newlinestiffness and the wing tip can be made in low elasticity modulus and mass density materials newlinesuch as aluminium alloy to reduce weight. At present, engineering applications of the axially newlinefunctionally graded materials (AFGMs) are available in which material constants vary in newlinelongitudinal direction i.e., supersonic aircrafts and shuttles, supersonic airflows, rotor blades newline(e.g.,turbine, compressor, or helicopter blades), and aeroelastic stability of aircraft wings. In newlineaerospace vehicles, the aerodynamic pressure varies along the axial direction. Environmental newlineeffects, namely moisture and temperature changes play a vital role in the design of newlineengineering applications. The combined effect of moisture and temperature-loading is called newlinethe hygrothermal effect. After a certain moisture content and temperature rise, the structural newlineelements can lose their strength. This innovative modeling is used in long-duration aerospace newlinemissions. As such, research on the vibration behavior of an AFGM beam under various types newlineof thermal variations under moisture effects needs to be explored. newline