Parametric study of Sandwich Plates with Viscoelastic, Auxetic Viscoelastic and Orthotropic Viscoelastic Core Using a New Higher Order Global-Local Theory

سال انتشار: 1400
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 337

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شناسه ملی سند علمی:

JR_JCAM-52-1_009

تاریخ نمایه سازی: 21 اردیبهشت 1400

چکیده مقاله:

In this paper, sandwich plates with flexible core and composite surfaces as well as viscoelastic and auxetic core is investigated under dynamic loading. A new higher order global-local theory is used for simulation of the dynamic behavior of sandwich plate. Ability of simulation the thickness changes of the plate and calculation of exact transverse stresses which are so crucial for studying of thick sandwich plate especially by soft core are some of the important features of the presented theory. Furthermore, in terms of solving equations, an iterative incremental method based on the formulation of transient nonlinear finite element as well as a real time algorithm was employed to simulate viscoelastic behavior accurately. The results indicate a significant increase in the stiffness of the sandwich plate due to the auxetic properties of the core materials, leading consequently to the reduction of the vibration amplitude and stresses level. Some of the innovations belonging to this paper are: ۱) presenting a global-local higher-order theory while considering the changes in the thickness of the sandwich plates; ۲) calculating transverse stresses using the three-dimensional elasticity method as well as modifying the results obtained from displacement and inertial effects based on this method; ۳) simulating sandwich plate with viscoelastic and auxetic cores; ۴) taking orthotropic properties for the viscoelastic core into account.

نویسندگان

Aidin Ghaznavi

Renewable Energies Department, Niroo Research Institute (NRI), Tehran, Iran

Mohammad Shariyat

Faculty of Mechanical Engineering, K.N. Toosi University of Technology, Tehran, Iran

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