Minimum stress design of transversely isotropic sandwich plates based on higher-order theory

1998 ◽  
Vol 15 (2) ◽  
pp. 114-123 ◽  
Author(s):  
V. E. Verijenko ◽  
E. B. Summers ◽  
S. Adali ◽  
M. Walker
Keyword(s):  
Transversely Isotropic ◽  
Order Theory ◽  
Higher Order ◽  
Sandwich Plates ◽  
Minimum Stress ◽  
Higher Order Theory

New Higher-Order Models for Sandwich Plates with a Flexible Core and their Accuracy Assessment

2019 ◽  
Vol 19 (03) ◽  
pp. 1950024 ◽  
Author(s):  
Ali Tian ◽  
Renchuan Ye ◽  
Peng Ren ◽  
Pengming Jiang ◽  
Zengtao Chen ◽  
...  
Keyword(s):  
Dynamic Models ◽  
Accuracy Assessment ◽  
Order Theory ◽  
Higher Order ◽  
Analytical Models ◽  
Core Material ◽  
Sandwich Plates ◽  
Higher Order Theory ◽  
Flexible Core

Two higher-order analytical models based on a new higher-order theory for sandwich plates with flexible cores are developed considering the effect of the core material density and skin-to-core-stiffness-ratio (SCSR). The main difference between the two models is the role of the flexible core in the dynamic response of sandwich plates with cores of different stiffnesses. Firstly, the governing equations of a simply supported sandwich plate with a flexible core are derived based on the two models, and the analytical solutions are determined by using Navier’s approach. Then, the free vibration, static, dynamic bending and stress field characteristics of the sandwich plates with different SCSRs are investigated. The results obtained by the proposed method are compared with other published results. In particular, an accuracy assessment of the present dynamic models is conducted for different SCSRs. Finally, conclusions on the applicability of the proposed method and other theories on sandwich plates with different SCSRs are drawn.

Analysis of damped composite sandwich plates using plate bending elements with substitute shear strain fields based on Reddy's higher-order theory

2002 ◽  
Vol 216 (5) ◽  
pp. 591-606 ◽  
Author(s):  
A K Nayak ◽  
R A Shenoi ◽  
S S J Moy
Keyword(s):  
Natural Frequencies ◽  
Mass Matrix ◽  
Order Theory ◽  
Higher Order ◽  
Sandwich Plates ◽  
Assumed Strain ◽  
Parametric Effects ◽  
Higher Order Theory ◽  
Damping Materials ◽  
Loss Factors

Two new C0 assumed strain finite element formulations of Reddy's higher-order theory are used to determine the natural frequencies and loss factors of layered anisotropic composite and sandwich plates. Material properties typical of fibre polyester resins for the skin and HEREX C70 PVC foam damping materials for cores are used to show the parametric effects of plate aspect ratio, length-thickness ratio on natural frequencies and loss factors. A consistent mass matrix is adopted in the present formulation. Both frequency-independent and frequency-dependent damping of viscoelastic materials are considered. The developed elements are free from spurious zero energy modes due to the assumed strain approach.

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