Compression Behavior of Adhesive Butt Joints of Aluminum Hexagonal Core Sandwich Panels with Different Edging Configurations

2012 ◽  
Vol 488-489 ◽  
pp. 737-741 ◽  
Author(s):  
S. Rajkumar ◽  
D. Ravindran ◽  
P.K. Arul Raj ◽  
V. Hariprasath
Keyword(s):  
Sandwich Panels ◽  
Weight Ratio ◽  
Fire Retardant ◽  
High Strength ◽  
Butt Joint ◽  
Honeycomb Core ◽  
Butt Joints ◽  
Compression Behavior ◽  
Complex Shapes ◽  
Aluminum Honeycomb

Aluminum honeycomb core sandwich panels are now commercially available and are widely used as light weight materials in aircraft, naval and other applications because of their high strength to weight ratio, high bending stiffness, fire retardant resistance, insulation properties and sound attenuation properties. In all these applications extensive joining is encountered in fabricating the panels to complex shapes. This paper has investigated various edging and configuration details to secure butt joints with adequate soundness through adhesive joining methods. The compression strength of the joints has been assessed experimentally. The configuration of each butt joint is discussed and best combinations of edging and configuration are recommended for successful fabrication of complex assembles with aluminum honey core sandwich panels.

scholarly journals Ballistic Resistance of Honeycomb Sandwich Panels under In-Plane High-Velocity Impact

2013 ◽  
Vol 2013 ◽  
pp. 1-20 ◽  
Author(s):  
Chang Qi ◽  
Shu Yang ◽  
Dong Wang ◽  
Li-Jun Yang
Keyword(s):  
Structural Parameters ◽  
Sandwich Panels ◽  
Unit Cell ◽  
Dynamic Responses ◽  
Honeycomb Core ◽  
Ballistic Resistance ◽  
Honeycomb Sandwich ◽  
Aluminum Honeycomb ◽  
Parametric Studies ◽  
Nonmonotonic Effects

The dynamic responses of honeycomb sandwich panels (HSPs) subjected to in-plane projectile impact were studied by means of explicit nonlinear finite element simulations using LS-DYNA. The HSPs consisted of two identical aluminum alloy face-sheets and an aluminum honeycomb core featuring three types of unit cell configurations (regular, rectangular-shaped, and reentrant hexagons). The ballistic resistances of HSPs with the three core configurations were first analyzed. It was found that the HSP with the reentrant auxetic honeycomb core has the best ballistic resistance, due to the negative Poisson’s ratio effect of the core. Parametric studies were then carried out to clarify the influences of both macroscopic (face-sheet and core thicknesses, core relative density) and mesoscopic (unit cell angle and size) parameters on the ballistic responses of the auxetic HSPs. Numerical results show that the perforation resistant capabilities of the auxetic HSPs increase as the values of the macroscopic parameters increase. However, the mesoscopic parameters show nonmonotonic effects on the panels' ballistic capacities. The empirical equations for projectile residual velocities were formulated in terms of impact velocity and the structural parameters. It was also found that the blunter projectiles result in higher ballistic limits of the auxetic HSPs.

scholarly journals Study on Bending Properties of Double Layer Aluminum Honeycomb Core Sandwich Panels

2006 ◽  
Vol 72 (724) ◽  
pp. 2050-2057 ◽  
Author(s):  
Yukiyoshi KOBAYASHI ◽  
Toshihisa OHTSUKA ◽  
Hiroshi TAMURA ◽  
Takehiro SATOH ◽  
Hiroyuki NAKAJIMA
Keyword(s):  
Double Layer ◽  
Sandwich Panels ◽  
Honeycomb Core ◽  
Bending Properties ◽  
Aluminum Honeycomb

Laser Weldability of Aluminum Alloy and Steel

2005 ◽  
Vol 502 ◽  
pp. 481-486 ◽  
Author(s):  
Seiji Katayama ◽  
Sung Min Joo ◽  
Masami Mizutani ◽  
Han Sur Bang
Keyword(s):  
Aluminum Alloy ◽  
Fusion Zone ◽  
Dissimilar Materials ◽  
High Strength ◽  
Butt Joint ◽  
Joint Interface ◽  
Butt Joints ◽  
Alloy Base ◽  
Lap Welding ◽  
Weld Fusion Zone

With the intention of improving butt or lap joint of dissimilar materials, specially devised weld beads together with lap and butt-joints were produced between A5052 and SPCC, where A5052 butt-joint was melted by heat-conduction of SPCC weld bead in addition to the formation of a limited weld fusion zone at the lap part in A5052 alloy. The thickness of intermetallic compounds at the butt-joint interface was approximately 2 μm and free of cracks. It was also revealed that crack-free lap weld metals were formed between aluminum alloy and steel when the penetration was controlled to be of less than 0.3 mm in depth at small heat input. It was moreover found that the majority of a laser weld fusion zone solidified as alpha(bcc)-iron phase containing small amount of aluminum, and cracks were absent in the case of hard intermetallic (AlxFey type) layer of less than 10μm zone. It was confirmed that a weld with lap and butt joints possessed high strength (leading to the load 3500 N to 4,380 N for 40 mm width specimen). In addition, SPCC and A1100 or A5052 were subjected to lap welding with a cw YAG laser, where one to three passes were performed to produce wider bonded areas. Dissimilar steel and aluminum joints with good mechanical properties were obtained, since the fracture occurred in the aluminum alloy base metal in the tensile test. It is concluded that welded joints of high strength can be produced between aluminum alloy and steel with proper devices.

Analysis of Physical and Mechanical Properties of A3003 Aluminum Honeycomb Core Sandwich Panels

2017 ◽  
Vol 867 ◽  
pp. 245-253 ◽  
Author(s):  
S. Rajkumar ◽  
B. Arulmurugan ◽  
M. Manikandan ◽  
R. Karthick ◽  
S. Kaviprasath
Keyword(s):  
Mechanical Properties ◽  
Sandwich Panels ◽  
Physical And Mechanical Properties ◽  
Honeycomb Core ◽  
Shear Moduli ◽  
The Core ◽  
Industrial Sectors ◽  
Aluminum Honeycomb ◽  
Strength And Stiffness ◽  
Core Materials

The demand for lightweight structures made of sandwich panels is ever increasing in many Industrial sectors. Numerous research efforts have been taken by various researchers in this area in terms of weight and cost reduction. Sandwich panel is a composite structure and it is an excellent alternative material in place of weight reduction without sacrificing its strength and stiffness characteristics. The geometrical characteristics of honeycomb core sandwich panels as well as their physical and mechanical properties such as compressive strength, flexural stiffness, core shear moduli, shear strength and stiffness are analyzed. The sandwich panels are available in various shapes and sizes to the service requirement. The commercially available sandwich panels have different core materials such as foams, FRPs and metallic and non metallic materials. The structure of the core typically varies as truss type and honeycomb. The face sheets and the core materials are bonded using thermo-set resins.

Investigation of Polyurethane Bonding to Steel in Sandwich Panels

2017 ◽  
Vol 890 ◽  
pp. 401-405 ◽  
Author(s):  
Meyrick Pereira ◽  
Maziar Ramezani ◽  
Timotius Pasang ◽  
Ben Withy
Keyword(s):  
Sandwich Structure ◽  
Load Transfer ◽  
Sandwich Panels ◽  
Weight Ratio ◽  
High Strength ◽  
Lap Shear ◽  
Bending Resistance ◽  
Point Bend Test ◽  
Three Point Bend Test ◽  
Point Bend

Sandwich panels made of thin and stiff skins, connected by a thick and soft core are widely used in load-bearing components mainly due to their high strength to weight ratio. To improve the reliability in using sandwich beams, it is necessary to understand their responses under external mechanical and environmental stimuli. This paper investigates the construction of steel-polyurethane-steel sandwich panels and their mechanical properties. Key properties of a sandwich structure are the adhesion between the skins and the sandwich material, and the load transfer from the outer skin to the inner skin. Lap shear specimens were selected to give an indication of the bond strength of the polyurethane to steel, whilst three point bend test specimens were selected to indicate the degree of load transfer between the skins and the bending resistance provided by the sandwich structure.

Hybrid Fiber Laser – Arc Welding of High Strength Low Alloy Steel

2014 ◽  
Vol 783-786 ◽  
pp. 663-668 ◽  
Author(s):  
Xin Jin Cao ◽  
Priti Wanjara ◽  
A. Bernard ◽  
Dominik Pudo ◽  
Cameron Munro ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Arc Welding ◽  
Welding Process ◽  
High Strength ◽  
Butt Joint ◽  
Hybrid Fiber ◽  
Butt Joints ◽  
Slow Cooling ◽  
High Laser ◽  
Arc Welding Process

High strength low alloy (HSLA) grade 80 (HSLA-80) steel with a thickness of 9.1-mm was successfully welded in a single pass using a 5-kW fiber laser combined with an arc welding process. It was found that the maximum gap size in the Y-groove butt joint configuration should remain below 0.2 mm for a 9.1-mm section thickness. Sound butt joints with no welding cracks but some minor microporosity were successfully obtained. However, an underfill defect was frequently observed on the top surface of the weldments. Underfilling could be mitigated through increasing the filler wire addition so as to exceed the groove volume; however, due to significant evaporation and expulsion of the molten pool at the high laser power density, the underfill defect would be difficult to fully eliminate. At slow cooling rates, slight softening in the heat affected zone (HAZ) was present in the mid-thickness region but its elimination is possible at high welding speeds.

Compressive strength of aluminum honeycomb core sandwich panels with thick carbon–epoxy facesheets subjected to barely visible indentation damage

2015 ◽  
Vol 50 (3) ◽  
pp. 387-402 ◽  
Author(s):  
Benjamin PJ Hasseldine ◽  
Alan T Zehnder ◽  
Bryan D Keating ◽  
Abhendra K Singh ◽  
Barry D Davidson
Keyword(s):  
Compressive Strength ◽  
Sandwich Panels ◽  
Honeycomb Core ◽  
Aluminum Honeycomb ◽  
Indentation Damage

scholarly journals Effect of Changing Properties of Wythes in Precast Structural Sandwich Panels

2020 ◽  
Vol 6 (9) ◽  
pp. 1765-1778
Author(s):  
Mohamed Abo El-Naga Kandil ◽  
Ahmed H. Abdelraheem ◽  
Mohamed Mahdy ◽  
Ahmed M. Tahwia
Keyword(s):  
High Strength Concrete ◽  
Sandwich Panels ◽  
Weight Ratio ◽  
High Strength ◽  
Core Material ◽  
Light Weight ◽  
Composite Action ◽  
Strength Concrete ◽  
Concrete Face ◽  
Positive Effect

This study investigates the effects of changing in the properties of face and core wythes in structural sandwich panels (with dimensions of 500 500 mm and 120 mm total height). Concrete face wythes of three grades (80, 70, 37) MPa, thicknesses of (25, 35, and 45) mm, and three types of core materials (high density foam, polyethylene foam, and palm bark) were used in the production of panels. Steel shear connectors were installed in the panels with angle of 45º. Three-point bending load test was carried out on all panels and results were compared with both of the theoretical extremes capacities of non- composite and fully-composite states and ANSYS software results. The degree of composite action (%) and the (strength/weight) ratio were the main parameters that judged the specimens. It was found that upgrading concrete increased overall strength of slabs especially in high strength concrete (80 MPa), however the use of lightweight concrete (70 MPa) caused high (strength/weight) ratio due to very lightweight. Results revealed that decreasing thickness of concrete face wythes had a positive effect on strength/weight ratio (although the ultimate loads decreased) that enhanced the performance of panels as lightweight structural panels. The optimum face wythe thickness is that of 2.5 cm and has high (strength/weight) ratio. It was noticed that adding polyethylene foam as a core material results in positive effect and high (strength/weight) ratio. Results revealed that high strength concrete (80 MPa) and light-weight concrete (37 MPa) are very successful in the production face wythes of precast light-weight sandwich panels that can obtain high (strength/weight) ratio and high percent of composite action.

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