【摘要】 利用Msc.Nastran平台的可扩展性,通过重合节点方法,建立了含分层损伤的非线形壁板颤振模型,考虑结构大变形、材料非线性的影响,研究了分层损伤对纤维增强金属层合板的气动弹性稳定性的影响规律及机理。研究表明:1)分层损伤面积增大时,纤维增强金属层合板出现多种非线性动力学运动,观察到概周期、极限环和多频振动的现象;2)分层损伤影响FML颤振模态的改变,是出现多种非线性动力学行为的原因;3)金属层的应力超过屈服极限时,由于材料弹塑性的影响,FML的颤振幅值明显增大。更多还原

【Abstract】 With the expansibility of Msc.Nastran platform,an element model of delaminated laminates is established based on coincident nodes method.With considering the effect of large-deformation and material nonlinearity,the nonlinear flutter equation of the plate is presented on the basis of the energy conservation principle,which is used to study the influence of delamination on aeroelastic stability of the fiber-reinforced metal laminate.The research results show that:1)The delamination causes several nonlinear dynamic phenomena of fiber-reinforced metal laminates;when the delamination area increases,limit cycle oscillation,almost periodic and multi-frequency vibration were observed.2)The presence of delamination would change the flutter mode of the fiber-reinforced metal laminate and is the main reason for the appearance of several nonlinear dynamic phenomena.3)when the composite metal layer stress reaches its yield limit,material nonlinearity will increase remarkably the amplitude of limit cycle oscillation.更多还原