scholarly journals Influence of the Thermal Field on Static Behaviour of Sandwich Structures

2019 ◽  
Vol 56 (1) ◽  
pp. 110-114
Author(s):  
Elena-Felicia Beznea ◽  
Gelu Coman ◽  
Nicusor Baroiu ◽  
Ionel Chirica
Keyword(s):  
Thermal Conductivity ◽  
Numerical Simulation ◽  
Thermal Field ◽  
Sandwich Structures ◽  
Experimental Studies ◽  
Sandwich Plates ◽  
Composite Sandwich ◽  
The Core ◽  
Composite Sandwich Structures ◽  
Static Behaviour

In this paper, numerical and experimental studies on the influence of the thermal field on behavior of the structure of sandwich plates in three points bending is analysed. Various materials are used so for skins. For the core only extruded polystyrene, with various thicknesses is used. The thermal conductivity n was determined by using the Hilton B480 unit, based on the heat flowmeter method described in ISO 8301:1991. We have been analyzed 12 cases of composite sandwich structures. The results obtained by experimental determination and numerical simulation of all cases of modeling are compared and certain differences occurred on the analyzing of influence of the thermal field on the bending characteristics of sandwich structures.

A parametric study of linear and nonlinear models for moisture diffusion in composite sandwich structures

2017 ◽  
Vol 52 (9) ◽  
pp. 1193-1201 ◽  
Author(s):  
Shane Paulson ◽  
John Peddieson ◽  
Jane Liu ◽  
Steve Mills
Keyword(s):  
Numerical Solutions ◽  
Model Problem ◽  
Sandwich Structures ◽  
Nonlinear Models ◽  
Relative Concentration ◽  
Moisture Diffusion ◽  
One Dimensional ◽  
Composite Sandwich ◽  
The Core ◽  
Composite Sandwich Structures

Disagreement has persisted in the modeling of Fickian moisture diffusion in sandwich structures as to the correct continuity conditions at the core/facesheet interface. The purpose of the present work is to compare moisture diffusion predictions based on two of the most widely used sets of these continuity conditions. The model problem of one-dimensional time-dependent moisture diffusion in a symmetric sandwich slab is selected for analysis. Finite difference numerical solutions reveal very little difference between the predictions of models assuming continuity of relative humidity and continuity of relative concentration over a wide variety of parametric conditions.

Research on Deformation Properties and Boundary Effect of Composite Sandwich Structure under Deep Hydrostatic Pressure

2012 ◽  
Vol 490-495 ◽  
pp. 3907-3911
Author(s):  
Jia Bo Qiu ◽  
Zhi Yuan Mei
Keyword(s):  
Hydrostatic Pressure ◽  
Theoretical Analysis ◽  
Deep Water ◽  
Surface Deformation ◽  
Sandwich Structures ◽  
Boundary Effect ◽  
Composite Sandwich ◽  
The Core ◽  
Composite Sandwich Structures ◽  
Deformation Properties

Composite sandwich structures have been used more and more widely in the underwater structures, therefore deformation problems under deep-water hydrostatic pressure can not be ignored. For the deformation properties of composite sandwich structures under deep-water hydrostatic pressure, the paper carried out theoretical and test research. First, the paper analyzed the surface deformation features as well as the law of the element’s cross-sectional dimension, the core thickness and elastic modulus to the surface deformation by establishing theoretical analysis model; The results show that the deformation area can be divided into central area and boundary area, and the boundary effect is an important factor affecting the deformation, the core parameters can affect the reach of boundary effect. Second, the paper carried out hydrostatic test of composite sandwich structural element model, and then verified the theoretical analysis model’s rationality and accuracy by comparing the test results and theoretical results.

Mechanical performance of CF/PEEK–PEI foam core sandwich structures

2017 ◽  
Vol 21 (8) ◽  
pp. 2680-2699 ◽  
Author(s):  
Jonas Grünewald ◽  
Patricia P Parlevliet ◽  
Alexander Matschinski ◽  
Volker Altstädt
Keyword(s):  
Mechanical Performance ◽  
Sandwich Structures ◽  
Cell Structure ◽  
Processing Parameters ◽  
Thermoplastic Composite ◽  
Composite Sandwich ◽  
The Core ◽  
Composite Sandwich Structures ◽  
Cell Structures ◽  
Original Cell

Previous work showed that thermoplastic composite sandwich structures offer great potential to meet the demands of lightweight structures for aviation applications. In this study, the influence of several processing parameters on the mechanical properties of thermoplastic sandwich components, consisting of carbon fibre reinforced polyetheretherketone skins and polyetherimide foam cores, is characterised. Sandwich specimens are manufactured with varying skin temperatures, core compaction distances and different polyetherimide concentrations at the skin–core interface. Following, sandwich samples are mechanically tested to characterise the bond strength, the core performance as well as the performance of the whole sandwich. The results show that in most cases the processing parameters significantly affect the cell structure of the sandwich core, provided that a proper fusion bond between skins and core exists. Thereby, the core performance seems to be weakened and failure predominantly occurs in the transition between affected and original cell structures.

scholarly journals The energy absorption behavior of novel composite sandwich structures reinforced with trapezoidal latticed webs

2021 ◽  
Vol 60 (1) ◽  
pp. 503-518
Author(s):  
Juan Han ◽  
Lu Zhu ◽  
Hai Fang ◽  
Jian Wang ◽  
Peng Wu
Keyword(s):  
Bearing Capacity ◽  
Energy Absorption ◽  
Sandwich Structure ◽  
Ultimate Load ◽  
Sandwich Structures ◽  
Elastic Displacement ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Composite Sandwich ◽  
Composite Sandwich Structures

Abstract This article proposed an innovative composite sandwich structure reinforced with trapezoidal latticed webs with angles of 45°, 60° and 75°. Four specimens were conducted according to quasi-static compression methods to investigate the compressive behavior of the novel composite structures. The experimental results indicated that the specimen with 45° trapezoidal latticed webs showed the most excellent energy absorption ability, which was about 2.5 times of the structures with vertical latticed webs. Compared to the traditional composite sandwich structure, the elastic displacement and ultimate load-bearing capacity of the specimen with 45° trapezoidal latticed webs were increased by 624.1 and 439.8%, respectively. Numerical analysis of the composite sandwich structures was carried out by using a nonlinear explicit finite element (FE) software ANSYS/LS-DYNA. The influence of the thickness of face sheets, lattice webs and foam density on the elastic ultimate load-bearing capacity, the elastic displacement and initial stiffness was analyzed. This innovative composite bumper device for bridge pier protection against ship collision was simulated to verify its performance. The results showed that the peak impact force of the composite anti-collision device with 45° trapezoidal latticed webs would be reduced by 17.3%, and the time duration will be prolonged by about 31.1%.

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