scholarly journals Numerical Study on the Plastic Forming of Doubly Curved Surfaces of Aluminum Foam Sandwich Panel Using 3D Voronoi Model

Metals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 675
Author(s):  
Xi Zhang ◽  
Qingmin Chen ◽  
Jiaxin Gao ◽  
Mingwei Wang ◽  
Ya Zhang ◽  
...  
Keyword(s):  
Aluminum Foam ◽  
Sandwich Panel ◽  
Face Sheet ◽  
Thickness Variation ◽  
Shape Error ◽  
Curved Surfaces ◽  
The Face ◽  
Plastic Forming ◽  
Doubly Curved ◽  
Forming Defects

This paper presents a numerical investigation on the plastic forming of doubly curved surfaces of aluminum foam sandwich panel (AFSP). A mesoscopic 3D Voronoi model that can describe the structure of closed-cell aluminum foam relatively realistically was established, and a series of numerical simulations using the model of the sandwich panel with a Voronoi foam core were conducted on the plastic forming of two typical doubly curved surfaces including spherical and saddle-shaped surfaces of AFSPs to analyze the deformation behaviors and the forming defects in detail. Multi-point forming experiments of spherical and saddle-shaped AFSPs with different target radii were implemented and the doubly curved panels with good forming quality were obtained. The simulated results of the surface illumination maps, the face sheet profiles, and the maximum strain differences in selected areas of the face sheet and the experimental results indicated that the Voronoi AFSP model can reflect the actual defects occurred in the plastic forming of doubly curved sandwich panels, and the high forming accuracy of the sandwich panel model was also demonstrated in terms of the shape error and the thickness variation.

Optimum Stacking Sequence Design of Composite Sandwich Panel Using Genetic Algorithms

2012 ◽  
Vol 585 ◽  
pp. 29-33
Author(s):  
Amarpreet S. Bir ◽  
Hsin Piao Chen ◽  
Hsun Hu Chen
Keyword(s):  
Genetic Algorithms ◽  
Sandwich Panel ◽  
Compressive Loading ◽  
Face Sheet ◽  
Composite Sandwich ◽  
Minimization Problems ◽  
The Face ◽  
Coupling Terms ◽  
Laminate Thickness ◽  
Buckling Load Maximization

In the present study, both critical buckling load maximization and face-sheet laminate thickness minimization problems for the composite sandwich panel, subjected to bi-axial compressive loading under various imposed constraints have been investigated using genetic algorithms. In the previously published work, the optimization of simple composite laminate panels with only even number of laminae has been considered [1, 3]. The present work allows the optimization of a composite sandwich panel with both even and odd number of laminae in the face-sheet laminates. Also, the effects of the bending-twisting coupling terms (D16and D26) in bending stiffness matrix which were neglected in the previous studies [1, 2, 3], are considered in the present work for exact solutions. In addition effect of both balanced and unbalanced face-sheet laminates on the optimum solutions have also been investigated, whereas only balanced laminates were considered in the previous studies [1, 2, 3].

Large deflection geometrically nonlinear bending of sandwich beams with flexible core and nanocomposite face sheets reinforced by nonuniformly distributed graphene platelets

2019 ◽  
Vol 22 (3) ◽  
pp. 866-895 ◽  
Author(s):  
S Jedari Salami
Keyword(s):  
Sandwich Panel ◽  
Sandwich Beam ◽  
Weight Fraction ◽  
Functionally Graded ◽  
Face Sheet ◽  
Sandwich Beams ◽  
Nonlinear Bending ◽  
Graphene Platelet ◽  
The Face ◽  
Graphene Platelets

This study investigates the nonlinear bending response of a novel class of sandwich beams with flexible core and face sheets reinforced with graphene platelets that are functionally graded distributed through the thickness. Nonlinear governing equations are established based on extended high-order sandwich panel theory and Von Kármán type of geometrical nonlinearity. In this theory, the face sheets follow the first-order shear deformation theory, and the two-dimensional elasticity is adopted for the core. These nonlinear differential equations are discretized into algebraic systems by means of the Ritz-based method from which the static bending solution can be achieved. The effective Young’s modulus of functionally graded graphene platelet-reinforced composite (GPLRC) face sheets is determined through the modified Halpin–Tsai micromechanics model, and associated Poisson’s ratio is evaluated by employing the rule of mixture. Comparison studies are provided for a sandwich beam with graphene-reinforced face sheets and conventional nanocomposite beam reinforced by graphene platelets due to lack of results for introduced sandwich beams. Besides, three-point bending test was carried out in order to assure the validity of nonlinear bending analysis of a sandwich beam based on extended high-order sandwich panel theory. Afterwards, parametric studies are given to examine the influences of graphene platelet distribution pattern, weight fraction, and core-to-face sheet thickness ratio together with the total number of layers on the linear and nonlinear bending performances of the sandwich beams. Numerical results demonstrate that distributing more graphene platelets near the upper and lower surface layers of the face sheets, named X-GPLRC, is capable to improve the bending strength and decrease the local deflection of the top face sheet, and this recovery effect becomes more significant as graphene platelet weight fraction increases. The results also reveal that the graphene platelet distribution pattern of the face sheets plays an important role to decrease the transverse shear stress of the core by dispersing more graphene platelets near surfaces of the face sheets (X-GPLRC). So, reducing the local deflection of the top face sheet tends to be much more safety of the soft core from any failure. Besides, sandwich beams with a lower weight fraction of graphene platelets in face sheets that are symmetrically distributed in such a way, called O-GPLRC, are also less sensitive to the nonlinear deformation.

Numerical Modelling of Impact Behavior of Composite Sandwich Panel With Honeycomb Core

2019 ◽  
Author(s):  
Shah Alam ◽  
Aakash Bungatavula
Keyword(s):  
Sandwich Panel ◽  
Sheet Thickness ◽  
Face Sheet ◽  
Honeycomb Core ◽  
Impact Performance ◽  
Composite Sandwich ◽  
The Core ◽  
The Face ◽  
Core Height ◽  
The Impact

Abstract The goal of this paper is to find the best impact response of the composite sandwich panels with honeycomb core. The focus of the study is to find the effects of changing the face sheet thickness and the core height of the sandwich panel subjected to variable velocities on impact performance. Initially, honeycomb core sandwich panel with 1mm thick face sheet is modelled in Abaqus/explicit to calculate the energy absorption, residual velocity, and deformation at four different velocities. Then, the process is repeated by changing the face sheets thickness to 2mm and 3mm to see the effects of changing the thickness on the impact performance of a composite sandwich panel. The honeycomb core height is also changed to see its effect on the performance. In all models, Al 7039 is used in the core and T1000G is used in the face sheets.

Numerical Simulation on the Compression Property in Different Face Sheet of Sandwich Panel Combined with Aluminum Foam

2018 ◽  
Vol 933 ◽  
pp. 351-356
Author(s):  
Yan Li Wang ◽  
Ke Nan Tian ◽  
Hong Xu ◽  
Lu Cai Wang
Keyword(s):  
Numerical Simulation ◽  
Composite Materials ◽  
Aluminum Foam ◽  
Sandwich Panel ◽  
Face Sheet ◽  
Absorption Properties ◽  
Plateau Stress ◽  
Absorption Energy ◽  
Bottom Face ◽  
Sandwich Sheets

Sandwich face sheets are very important roles in composite materials. It was simulated that the quasi-static compressive crush performances of three types of sandwich sheets by ANSYS/LS-DYNA software. The aluminum top panels (“half hard”) had the higher plateau stress and its absorption energy reached 20.483J/mm3, were superior to the steel top panel (“hard”); the bottom face sheet rarely affects the energy absorption properties in cases.

The effect of local bending stiffness on the wrinkling of sandwich panels

2003 ◽  
Vol 217 (2) ◽  
pp. 111-119
Author(s):  
L Fagerberg
Keyword(s):  
Elastic Modulus ◽  
Sandwich Panel ◽  
Volume Fraction ◽  
Fibre Volume Fraction ◽  
Fibre Volume ◽  
Bending Stiffness ◽  
Face Sheet ◽  
Stacking Sequence ◽  
The Core ◽  
The Face

The use of the face sheet elastic modulus versus the face sheet local bending stiffness while designing against wrinkling is discussed in this paper. It shows that there are several ways to improve the critical wrinkling load of a sandwich panel without replacing the core. It is often possible to increase the wrinkling load by as much as 25 per cent without virtually any increase in weight or cost of the sandwich. This is achieved by improving the local bending stiffness of the sandwich face sheet by either optimizing the stacking sequence, lowering the fibre volume fraction or adding some extra layers of a cheap fibre material to the sandwich face, creating a minisandwich within the face sheet. Experiments are performed that clearly show the potential for increasing the critical wrinkling load by means of altering the face sheet.

Response of aluminum corrugated sandwich panels under foam projectile impact – Experiment and numerical simulation

2016 ◽  
Vol 19 (5) ◽  
pp. 595-615 ◽  
Author(s):  
Xin Li ◽  
Shiqiang Li ◽  
Zhihua Wang ◽  
Jinglei Yang ◽  
Guiying Wu
Keyword(s):  
Impact Velocity ◽  
Aluminum Foam ◽  
Sandwich Panels ◽  
Face Sheet ◽  
Front Face ◽  
Comparable Amount ◽  
Projectile Impact ◽  
The Face ◽  
Core Height ◽  
The Impact

The paper studied the dynamic response of square aluminum corrugated sandwich panels under projectile impact. The aluminum foam projectile was utilized to apply the impulse on the sandwich panels. In order to increase the applied impulse under controlled impact velocity ( V < 200 m/s), a cylindrical Nylon mass was adhered to the back of foam projectile. Corrugated sandwich panels with two different configurations were tested and their typical deformation modes were obtained in the experiment. Based on the experiment, corresponding numerical simulations were presented. The energy absorption and deformation mechanism of corrugated sandwich panels were studied through the simulation. The influence of impact velocity, thickness of face sheet and wall thickness of corrugated core were discussed. The results indicated that the corrugated sandwich panels with smaller core height produce larger deformation than the panels with larger core height. The face sheets of corrugated sandwich panel absorbed comparable amount of energy with the corrugated core. The velocity histories show that under the combined action of aluminum foam projectile and nylon back mass, a second peak velocity of front face sheet can be produced during the impact process, which is defined as “accelerating impact stage” in current study. The influence of “accelerating impact stage” to the response of structures is sensitive to the impact velocity.

Compression Test of Composite Sandwich Panel

2007 ◽  
Vol 348-349 ◽  
pp. 605-608
Author(s):  
Jong Woong Lee ◽  
Cheol Won Kong ◽  
Se Won Eun ◽  
Jae Sung Park ◽  
Young Soon Jang ◽  
...  
Keyword(s):  
Compression Test ◽  
Sandwich Panel ◽  
Weight Ratio ◽  
Fem Analysis ◽  
Face Sheet ◽  
Bending Stress ◽  
Composite Sandwich Panels ◽  
Composite Sandwich ◽  
Commercial Code ◽  
The Face

Composite materials are used in aerospace structures due to their considerable bending stiffness and strength-to-weight ratio. A composite sandwich is composed of a face-sheet and an aluminum core. The face-sheet of the sandwich takes the bending stress and core of sandwich takes the shear stress. A compression test and FEM analysis accomplished about composite sandwich panels that have curvature. The FEM analysis was performed using a commercial code, ANSYS and the compression test was performed until failure occurred in the sandwich panel. A strain gauge and a displacement gauge were used to acquire the data. In this paper, the failure strength and failure mode was checked. Additionally, the results of the test and analysis were compared.

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