Thermal Compatibility of Ceramic Veneers to a High Strength Core Material

2019 ◽  
Vol 29 (4) ◽  
Author(s):  
Pannapa Sinthuprasirt
Keyword(s):  
High Strength ◽  
Core Material ◽  
Thermal Compatibility

Mechanical performance of honeycomb sandwich structures built by FDM printing technique

2021 ◽  
pp. 089270572199789
Author(s):  
S Gohar ◽  
G Hussain ◽  
A Ali ◽  
H Ahmad
Keyword(s):  
Fused Deposition Modeling ◽  
Mechanical Performance ◽  
Sandwich Structures ◽  
Weight Ratio ◽  
High Strength ◽  
Core Material ◽  
Interfacial Bond Strength ◽  
Fused Deposition ◽  
Competitive Prices ◽  
Composite Face

Honey Comb Sandwich Structures (HCSS) have numerous applications in aerospace, automobile, and satellite industry because of their properties like high strength to weight ratio, stiffness and impact strength. Fused Deposition Modeling (FDM) is a process which, through its flexibility, simple processing, short manufacturing time, competitive prices and freedom of design, has an ability to enhance the functionality of HCSS. This paper investigates the mechanical behavior (i.e. flexural, edgewise compression and Interfacial bond strength) of FDM-built HCSS. The influence of face/core material was examined by manufacturing four types of specimens namely ABS core with Composite (PLA + 15% carbon fibers) face sheets, ABS core with PLA face sheets, TPU core with composite face sheets and TPU core with PLA face sheets. To measure the effect of face sheets geometry, raster layup was varied at 0°/90° and 45°/−45°. The mechanical characterization revealed that an optimum combination of materials is ABS core with composite face sheets having raster layup of 0°/90°. This study indicates that HCSS with complex lamination schemes and adequate mechanical properties could be manufactured using FDM which may widen the applications of FDM on an industrial scale.

Stretch Formability Behaviour of Glass Fibre Reinforced Nanoclay on Fiber Metal Laminated Composites

2018 ◽  
Vol 10 (2) ◽  
Author(s):  
K. Logesh ◽  
V.K Bupesh Raja ◽  
C. Krishnaraj
Keyword(s):  
Ductile Fracture ◽  
Epoxy Resin ◽  
Glass Fibre ◽  
Weight Ratio ◽  
High Strength ◽  
Core Material ◽  
Fibre Metal Laminates ◽  
Sem Image ◽  
Pull Out ◽  
Fibre Metal

Innovations and research in material processing have brought forward new and improvised materials that are applied in body panels of automobiles, aircraft cabins and railway wagons. These materials are used widely is because of their good mechanical properties and their high strength to weight ratio. In this paper Fibre Metal Laminates (FMLs) were added with organo modified montmorillonite (MMT) commonly known as nanoclay along with epoxy resin. The homogeneous dispersion of nanoclay in epoxy resin is accomplished by a hand stirrer dispersion method in ethanol. The FML material was processed by hand layup method. In this study the aluminium alloy 5052-H32 was used as a skin material and glass fibre (woven roving) used as core material which is bounded by epoxy with 5 wt.% nano clay (closet 30B). The fabricated sandwich material was cut by using water jet machine as per IS standards for testing. The fabricated material subjected to erichsen cupping test and was observed under Scanning Electron Microscope (SEM). The results from SEM image analysis indicated that the FML had fibre pull out and surface cracks were obtained in the skin material. Progressive loading resulted in ductile fracture which is absorbed in the specimen. Fibres came across brittle failure and the skin through ductile fracture. Non-uniform distribution of reinforcement is observed in the material, SEM micrographs revealed fibre cracks which were oriented in line to the direction of crack growth on the skin material. This study shows that these fibre metal laminates can be safely applied in automotive field.

scholarly journals Experimental study on flexural and shear behaviour of sandwich panels using glass textile reinforced concrete and autoclaved aerated concrete

2020 ◽  
Vol 71 (1) ◽  
pp. 18-26
Author(s):  
Mai Bui Thi Thanh ◽  
Cuong Nguyen Huy ◽  
Quang Ngo Dang ◽  
Tai Dinh Huu
Keyword(s):  
Reinforced Concrete ◽  
Lightweight Concrete ◽  
Sandwich Panels ◽  
High Strength ◽  
Core Material ◽  
Shear Behaviour ◽  
Textile Reinforced Concrete ◽  
Autoclaved Aerated Concrete ◽  
Sandwich Construction ◽  
Aerated Concrete

Textile-reinforced concrete (TRC) is a new composite material made of high-strength textiles embedded within fine grained concrete (FGC). The application of TRC leads to the design of thin and slender structures or for repairing and strengthening of existing structural members. Autoclaved aerated concrete (AAC) is an ultra-lightweight concrete, which can be combined with high strength TRC to form some kinds of precast curtain panels in construction. The concept of the TRC-AAC panel is based on the theory of sandwich construction with strong and stiff skins, like TRC layers, bonded to a lightweight AAC core. The resulting hybrid TRC-AAC panel can be used as structural or non-structural member for the housing construction. In this paper, the flexural and shear performance of hybrid TRC-AAC sandwich panels is presented by means of experimental results. The sandwich panels use three layers of different materials: TRC for the tensile layer, AAC for the core material and FGC for the compressive layer. Three different types of glass textile were used as reinforcements in the TRC layers.

Roll Bonding of Two Materials Using Temperature to Compensate the Material Strength Difference

2014 ◽  
Vol 966-967 ◽  
pp. 471-480 ◽  
Author(s):  
Alina Melzner ◽  
Gerhard Hirt
Keyword(s):  
Surface Layer ◽  
Atmospheric Corrosion ◽  
Pure Aluminum ◽  
High Strength ◽  
Cooling Time ◽  
Core Material ◽  
Material Strength ◽  
Roll Bonding ◽  
Strength Difference ◽  
High Strength Aluminum Alloys

A part with optimized material characteristics can be realized by cladding of two or more materials. In the aerospace industry high strength aluminum alloys like AA2024 are commonly used. Due to their susceptibility to atmospheric corrosion a protective surface layer has to be provided, e.g. pure aluminum. Because of high differences in material strength problems occur during bonding. This study discusses if and how active cooling can be used to create a temperature field which compensates the material strength difference and thus improves roll bonding of two materials of different strength. Cooling simulations were carried out to investigate the influence of the boundary conditions and cooling time before hot rolling for different layer thicknesses. For the example of a thick core (50 mm) and a thinner cover layer (10 mm) the optimal cooling time was determined to be in a range of 3 - 14 s. Furthermore, roll bonding experiments were performed at various height reductions and cooling times to investigate the influence of the material strength differences on the rolling and bonding behavior. Due to the implementation of a cooling operation a varying elongation of the surface layer and the core material has been successfully reduced from 30 to 22 mm.

scholarly journals Compound Layer Design for Deep Nitrided Gearings

Metals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 455
Author(s):  
Stefanie Hoja ◽  
Matthias Steinbacher ◽  
Hans-Werner Zoch
Keyword(s):  
Bulk Material ◽  
Load Capacity ◽  
Nitrided Layer ◽  
High Strength ◽  
Compound Layer ◽  
Nitride Layer ◽  
Negative Influence ◽  
Core Material ◽  
Simultaneous Formation ◽  
Short And Long Term

Deep nitriding is used to obtain a nitriding hardness depth beyond 0.6 mm. The long nitriding processes, which are necessary to reach the high nitriding hardness depths, mostly have a negative influence on the hardness and strength of the nitrided layer as well as on the bulk material. The compound layer often is considered less, because in most practical cases, it is removed mechanically after nitriding, to avoid spalling in service. However, in former investigations, it was shown, that thick and compact compound layers have the potential for high flank load capacity of gears. The investigations focus on the simultaneous formation of a high nitriding depth and a thick and compact compound layer. Beside the preservation of the strength, a challenge is to control the porosity of the compound layer, which should be as low as possible. The investigations were carried out using the common nitriding and heat treatable mild steel 31CrMoV9, which is often used for gear applications. The article gives an insight on the development of multistage nitriding processes studied by short- and long-term experiments aiming for a specific compound layer build-up with low porosity and high strength of the nitride layer and core material.

Thermal compatibility of ceramic veneers to a fluorcanasite core material

2009 ◽  
Vol 25 (5) ◽  
pp. e43-e44
Author(s):  
S. Pollington ◽  
R. Van Noort
Keyword(s):  
Core Material ◽  
Thermal Compatibility

Novel Honeycomb Glassfiber Mat as the Core of Vacuum Insulation Panel

2014 ◽  
Vol 900 ◽  
pp. 247-250
Author(s):  
Cheng Dong Li ◽  
Zhao Feng Chen
Keyword(s):  
Thermal Insulation ◽  
High Performance ◽  
Three Dimensional ◽  
High Strength ◽  
Glass Wool ◽  
Core Material ◽  
The Core ◽  
Vacuum Insulation ◽  
Novel Structure ◽  
Chopped Strand Mat

Vacuum insulation panels (VIPs) are regarded as one of the most promising high-performance thermal insulation solutions on the market today. In this paper, a novel structure, i.e., honeycomb glassfiber mat was proposed as the core material of VIP. The honeycomb glassfiber mat was composed of glass wool mat and glassfiber chopped strand mat. Among them, 70% centrifugal glass wool and 30% flame attenuated glass wool were mixed together to form the 0.5mm-thickness glass wool mat, while thirteen holes with diameter of 10mm were opened uniformly on the surface of glassfiber chopped strand mat. Glassfiber VIPs possessed honeycomb core material have superior thermal conductivity of 1.52mW/(m•K). In order to obtain better thermal insulation performance, ultrafine and stiff fibers with three-dimensional overlapping structure is preferable. Meanwhile, hollow fibers with bifurcated structure are the guarantee of high-strength core material.

scholarly journals Design and Analysis of Hexagonal and Octagonal Honey Comb Structures with Various Materials and FEM Analysis.

2020 ◽  
Vol 9 (7) ◽  
pp. 669-678
Keyword(s):  
Low Cost ◽  
Flow Simulation ◽  
Fem Analysis ◽  
High Strength ◽  
Simulation Software ◽  
Core Material ◽  
Efficient Production ◽  
Material Usage ◽  
High Efficient ◽  
Cost Efficient

The demands for automotive interior and exterior panels in present and future request is an optimal combination of materials and cost-efficient production processes. Mechanical andacoustical requirementsof high strength and a weight target result, todayoften in the selection of a sandwich design with a cost efficient and recyclable core material. Honey comb sandwich structures are used in Airplane wings, Ships, Cars, Civil Constructions, etc. Now a days this technology is being used allover the automotive fields. These designs are the best way for low material usage and high strength. In this project the designs of hexagonal and octagonal honey comb structures are to be analysed and compared for the best result in structure. The structures are to be developed by using SolidWorks[1] software. Solidworks flow simulation is to be used to test the effectiveness and limitations of the structures. Thermal and static analysis are to be analysed by using solidworks simulation software with different types of materials like Titanium, Aluminum, and Stainless steelto identify the best material at low cost and high efficient by applying various loads of finite element method analysis.

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.

scholarly journals Method for determination of optimal geometrical parameters of a unit cell of X-shaped truss cores

2019 ◽  
Vol 18 (3) ◽  
pp. 99-108
Author(s):  
S. M. Mousavi Safavi
Keyword(s):  
Relative Density ◽  
Shear Stiffness ◽  
High Strength ◽  
Metal Plate ◽  
Unit Cell ◽  
Truss Structures ◽  
Core Material ◽  
Geometrical Parameters ◽  
Shear Stresses ◽  
Truss Core

Recently, in order to develop high-strength lightweight core materials of sandwich structures for multi-functional applications, a large number of truss structures have been created, including pyramidal and tetrahedral truss cores. In this paper, a new truss structure is developed to be used as core material in sandwich panels. The X-shaped truss core consists of discrete hourglass-shaped unit cells formed by the groove-to-groove connection of two flat X-shaped truss elements made by metal plate cutting. In order to determine optimal geometrical parameters of a unit cell of X-shaped truss core, in this work it is proposed to plot the diagrams of relative density versus the angle of the rods for the required values of equivalent critical compression and lateral shear stresses, and for the required values of equivalent compression and shear stiffness of the unit cell of X-shaped truss core. The results show that with the same mechanical characteristics, the relative density of the optimal X-shaped truss core is less than the relative density of optimal pyramidal and tetrahedral truss cores.

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