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.

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

scholarly journals Experimental investigation of unbound nodes identification for metallic sandwich panels with truss core

2017 ◽  
Vol 163 ◽  
pp. 248-256 ◽  
Author(s):  
Lingling Lu ◽  
Hongwei Song ◽  
Chenguang Huang
Keyword(s):  
Experimental Investigation ◽  
Sandwich Panels ◽  
Truss Core

scholarly journals Prediction on Deflection of Truss-Core Sandwich Panels in Weak Direction

2013 ◽  
Vol 6 (1) ◽  
pp. 65-72
Author(s):  
Wang Yamin ◽  
Shao Yongbo ◽  
Liu Yukai
Keyword(s):  
Sandwich Panels ◽  
Truss Core

scholarly journals Damage identification of low-density material–filled sandwich panels with truss core based on vibration properties

2018 ◽  
Vol 18 (5-6) ◽  
pp. 1711-1721
Author(s):  
Jie Le ◽  
Lingling Lu ◽  
Yabo Wang ◽  
Hongwei Song ◽  
Xiaodong Xing ◽  
...  
Keyword(s):  
Young’S Modulus ◽  
Damage Identification ◽  
Young's Modulus ◽  
Damage Index ◽  
Sandwich Panels ◽  
Energy Operator ◽  
Weight Coefficient ◽  
Low Density ◽  
Truss Core ◽  
Method Effects

A damage-identification method based on flexibility matrix and Teager energy operator is proposed for low-density material–filled sandwich panels with truss core. In the proposed damage index, weight coefficient r is introduced to consider the effect of damages on both high-order and low-order modes. Numerical simulations and experiments are conducted to assess the performance of the proposed method. Effects of Young’s modulus of the filler material on the accuracy of the proposed method are also discussed. Results reveal that the method is reliable and effective for single-damage and multiple-damages identification of filled sandwich panels with truss core, and weight coefficient plays an important role, especially for cases with multiple damages or damages of small extent. Damage identification becomes more difficult as Young’s modulus of the filler increases, and there is a critical value, after which the damage could not be identified by the proposed method.

Modeling and reliability of insert in composite pyramidal lattice truss core sandwich panels

2019 ◽  
Vol 221 ◽  
pp. 110888 ◽  
Author(s):  
Ge Qi ◽  
Li Ma ◽  
Shu-Yang Wang
Keyword(s):  
Sandwich Panels ◽  
Truss Core

Effect of longitudinal deformation on wave propagation in truss core sandwich panel

2020 ◽  
pp. 095745652096488
Author(s):  
Sun Liang ◽  
Xiao Yougang
Keyword(s):  
Transverse Direction ◽  
Sandwich Panel ◽  
Sandwich Panels ◽  
Theoretical Models ◽  
The Other ◽  
Full Model ◽  
Longitudinal Deformation ◽  
Compressive Wave ◽  
High Frequencies ◽  
Truss Core

The longitudinal deformation has been ignored by most previous study on vibroacoustic behaviours of truss core sandwich panels. This paper investigates its effect by developing two theoretical models. One, named as full model, considers both flexural and longitudinal deformation of face sheets while the other, named as flexural model, incorporates only flexural deformation. By comparing free characteristic waves obtained from two models, one find that flexural model ignore two waves, that is, a compressive wave and a global flexural one. The ignored waves cause vibration in transverse direction even at high frequencies, and thus result in vibration peaks under forced vibration. Therefore the flexural model would underestimate the vibration response, and the longitudinal deformation of face sheets cannot be ignored during dynamic analysis of the sandwich panels.

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