Effect of local damages on the buckling behaviour of pyramidal truss core sandwich panels

2016 ◽  
Vol 149 ◽  
pp. 271-278 ◽  
Author(s):  
Wu Yuan ◽  
Hongwei Song ◽  
Lingling Lu ◽  
Chenguang Huang
Keyword(s):  
Sandwich Panels ◽  
Truss Core ◽  
Pyramidal Truss

Mechanical and thermal insulate behaviors of pultruded GFRP truss-core sandwich panels filled with EPS mortar

2021 ◽  
Vol 21 (2) ◽  
Author(s):  
Sensen Li ◽  
Bei Zhang ◽  
Dapeng Yang ◽  
He Wang ◽  
Yang Liu ◽  
...  
Keyword(s):  
Sandwich Panels ◽  
Truss Core

Buckling of sandwich panels with transversely flexible core: Correction of the equivalent single-layer model using thick-faces effect

2018 ◽  
Vol 22 (5) ◽  
pp. 1612-1634 ◽  
Author(s):  
J Jelovica ◽  
J Romanoff
Keyword(s):  
Finite Element ◽  
Transverse Shear ◽  
Sandwich Panels ◽  
Shear Deformation Theory ◽  
Single Layer ◽  
Element Model ◽  
Layer Model ◽  
The Core ◽  
Truss Core ◽  
Single Layer Model

Modeling a periodic structure as a homogeneous continuum allows for an effective structural analysis. This approach represents a sandwich panel as a two-dimensional plate of equivalent stiffness. Known as the equivalent single-layer, the method is used here to analyze bifurcation buckling of three types of sandwich panels with unidirectional stiffeners in the core: truss-core, web-core and corrugated-core panels made of an isotropic material. The transverse shear stiffnesses of these panels can differ by several orders of magnitude, which cause incorrect buckling analysis when using the equivalent single-layer model with the first-order shear deformation theory. Analytical solution of the problem predicts critical buckling loads that feature infinite number of half-waves in the direction perpendicular to the stiffeners. Finite element model also predicts buckling modes that have non-physical, saw-tooth shape with infinite curvature at nodes. However, such unrealistic behavior is not observed when using detailed three-dimensional finite element models. The error in the prediction of the critical buckling load is up to 85% for the cases considered here. The correction of the equivalent single-layer model is proposed by modeling the thick-faces effect to ensure finite curvature. This is performed in the finite element setting by introducing an additional plate with tied deflections to the equivalent single-layer plate. The extra plate is represented with bending and transverse shear stiffness of the face plates. As a result, global buckling is predicted accurately. Guidelines are proposed to identify the sandwich panels where ordinary model is incorrect. Truss-core and web-core sandwich panels need the correction. Corrugated-core panels without a gap between plates in the core have smaller shear orthotropy and do not need the correction. Modeling the thick-faces effect ensures correct results for all cases considered in this study, and thus one should resort to this approach in case of uncertainty whether the ordinary equivalent single-layer model is valid.

Sound insulation performance of pyramidal truss core sandwich structure with frame

2021 ◽  
pp. 109963622110288
Author(s):  
Yu-Zhou Wang ◽  
Li Ma
Keyword(s):  
Mechanical Properties ◽  
Sandwich Structure ◽  
Transmission Loss ◽  
Low Frequency ◽  
Sound Insulation ◽  
Geometrical Parameters ◽  
Acoustic Performance ◽  
Truss Core ◽  
Pyramidal Truss ◽  
Wave Angle

Recently, sandwich structures have been widely used in different fields because of their good mechanical properties, but these structures are weak in acoustic performance. In this paper, by combining pyramidal truss core sandwich structure with frame, a new structure is proposed with both good mechanical properties and excellent acoustic performance at low frequency. An analytical model of the pyramidal truss core sandwich structure with frame is developed to investigate the sound transmission loss (STL) performance. Finite element method (FEM) is also used to investigate the STL performance at low frequency. The effects of the incident wave angle and the geometrical parameters on the STL of the structure are discussed.

A protocol for characterizing the structural performance of metallic sandwich panels: application to pyramidal truss cores

2004 ◽  
Vol 41 (22-23) ◽  
pp. 6249-6271 ◽  
Author(s):  
F.W. Zok ◽  
S.A. Waltner ◽  
Z. Wei ◽  
H.J. Rathbun ◽  
R.M. McMeeking ◽  
...  
Keyword(s):  
Sandwich Panels ◽  
Structural Performance ◽  
Pyramidal Truss

scholarly journals Internal Damage Identification of Sandwich Panels With Truss Core Through Dynamic Properties and Deep Learning

2020 ◽  
Vol 7 ◽  
Author(s):  
Lingling Lu ◽  
Yabo Wang ◽  
Jianquan Bi ◽  
Cheng Liu ◽  
Hongwei Song ◽  
...  
Keyword(s):  
Deep Learning ◽  
Damage Identification ◽  
Dynamic Properties ◽  
Sandwich Panels ◽  
Internal Damage ◽  
Truss Core
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