کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
288383 | 509620 | 2011 | 18 صفحه PDF | دانلود رایگان |
A theoretical framework is presented for predicting the nonlinear damping and damped vibration of laminated composite strips due to large in-plane forces. Nonlinear Green–Lagrange axial strains are introduced in the governing equations of a viscoelastic composite and new nonlinear damping and stiffness matrices are formulated including initial stress effects. Building upon the nonlinear laminate mechanics, a damped beam finite element is developed. Finite element stiffness and damping matrices are synthesized and the static equilibrium is predicted using a Newton–Raphson solver. The corresponding linearized damped free-vibration response is predicted and modal frequencies and damping of the in-plane deflected strip are calculated. Numerical results quantify the nonlinear effect of in-plane loads on structural modal damping of various laminated composite strips. The modal loss-factors and natural frequencies of cross-ply Glass/Epoxy beams subject to in-plane loading are measured and correlated with numerical results.
► Theoretical formulation for nonlinear stiffness and damping of laminated beams.
► Finite element inclusive of nonlinear effects of prestressing on structural damping.
► Initial tensile in-plane stresses effect on laminated strips structural modal damping.
► Dependence of modal damping and frequencies of Glass/Epoxy strips on axial stress.
Journal: Journal of Sound and Vibration - Volume 330, Issue 23, 7 November 2011, Pages 5660–5677