Thermal Buckling And Damping Characteristics Of Fiber Reinforced Laminated Plates With Viscoelastic Layers

Due to its excellent mechanical properties,fiber reinforced laminated plates are widely used in aerospace,submarines,bridges,construction and other industries.In practical applications,it is often subjected to harsh environment and complex loading conditions.For example,an aerospace vehicle is heated by solar radiation in space.The temperature changes significantly.The resulting thermal expansion and boundary constraints cause thermal stress within the structure,which may cause thermal buckling.The viscoelastic properties have a significant effect on the buckling and vibration behavior of viscoelastic laminates.Based on the above mentioned background,the thermal buckling and damping characteristics of fiber reinforced laminated plates with viscoelastic layers were analyzed.For fiber reinforced laminated plates with viscoelastic layers that do not take into account changes in material properties with temperature,classical von Karman plate theory and Hamiltonian principles are used to establish the equation of motion of the structure.The items related to the time derivative are omitted and the control equation of thermal buckling of the structure is obtained.By making the determinant of the stiffness matrix equal to zero,the critical thermal buckling temperature of the structure can be obtained.By solving the eigenvalue problem,the natural frequency and damping ratio of the structure can be obtained.The critical thermal buckling temperature,natural frequency and damping ratio of the structure under different viscoelastic layer thickness,paving patterns,aspect ratio and boundary conditions were calculated.The influence of non-uniform temperature distribution on the critical thermal buckling temperature,natural frequency and damping ratio of the structure is emphatically analyzed.The mechanical and thermophysical properties of many composite materials are sensitive to temperature changes.Fiber reinforced laminated plates with viscoelastic layers that consider temperature-dependent material properties were analyzed.The equation of motion of the structure is still derived based on the classical von Karmen plate theory and the Hamiltonian principle.The thermal buckling control equation obtained after neglecting the term related to the time derivative is a nonlinear equation about the instantaneous temperature T,and is solved using an iterative method.The effects of the thickness of viscoelastic layer,paving patterns,aspect ratio,boundary conditions,and temperature distribution on the critical thermal buckling temperature,natural frequency,and damping ratio of fiber reinforced laminated plates with viscoelastic layers were analyzed.And the results obtained were compared with the results of laminated composite plates with temperature-dependent material properties.