Sandwich panels are a type of composite structure that is commonly used in aerospace, marine, and automotive applications where strength or stiffness is required, but weight is a critical component.
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A sandwich panel works by inserting a lightweight core material between two thin, stiff facesheets. If the whole sandwich panel deforms it behaves as a composite material that is stronger than the sum of its parts.
The composite parts work together by having the thin (yet stiff) faces resist bending, while the thick (yet compliant) core absorbs any deformation from shearing or sliding. But the stiffness and strength of the panel depends not only on the stiffness of the faces, but also the thickness of the core. When the stiff skins are bonded to a core, it keeps the skins separated from each other, massively increasing the overall bending stiffness of the sandwich panel structure without appreciably increasing the weight.
The core should be lightweight and the skins should be stiff. Ideally, core and skins should be able to be bonded together easily. Often a foam or honeycomb material made of thermoplastic polymer is used as the lightweight core, and stiffer products like steel and fiber-reinforced materials are used for the skins.
A sandwich panel makes efficient use of material by placing stiff components where they are needed most - in this case, on either side of the core - and lessening weight everywhere else.
To visualize this efficiency, imagine making a series of sandwich panels with aluminum skins and a lightweight foam core., The skins are always the same thickness, but we'll adjust the core by cutting our foam to different thicknesses.
If there is no foam at all, then we can see the stiffness for the two skins is at 1. By adding foam between, both the weight and stiffness increase, but crucially, the stiffness-to-weight ratio increases dramatically as the panel gets thicker.
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This question can be hard to answer, since it depends on your application. So let's use a concrete example.
For semi-trailer transportation, weight is king - but the walls of a dry van still need to be stiff enough to bear the load it carries and potentially hold up to curveballs like strong winds, falling cargo, or errant forklifts.
We'll need to choose a sandwich panel with the right stiffness for the job, and it turns out that there are many different skin and core thickness options that all give the same stiffness.
To get the best panel for our semi-trailer, we need to optimize the combination of skins and core that gives the lightest sandwich without sacrificing stiffness. If multiple types of material can be considered for both skins and core, then our problem becomes even more involved, but still tractable.
Sandwich panels rely on continued bonding between the skins and core to remain effective. Often the compliant core material is the weak point, and will fracture long before the adhesive bond or the skins fail. One problem with using lightweight foams is that they are relatively weak, so sometimes honeycomb cores are used instead to get a boost in strength. Unfortunately, honeycomb also suffers drawbacks as it is more difficult to bond to the skins and, when deformed, it has a natural tendency to peel away from the skins in a process called delamination.
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Polyurethane sandwich panel beautiful shape, the overall effect is good, it integrating bearing, thermal insulation, fire prevention, waterproof, without secondary decoration, convenient installation, short construction period, good comprehensive benefits, have good price advantage, is a kind of widely used, potential energy efficient building palisade materials, it is advocated by the ministry of construction and promotion of a new type of energy-saving plates.
Sandwich against leaking roof panel, polyurethane rigid foam insulation board, polyurethane composite panels, PU board, is the popular term polyurethane sandwich board, strictly speaking, should be used in polyurethane thermal insulation sandwich board, conforms to the national standard GB/T -, the replacement of the old standard JC/T868-.
Usage:
The product is rigid polyurethane as the thermal insulation layer of double metal surface, sheet metal, non-metallic surface composite plate, usually used in industrial workshop, logistics, warehousing, integration, building walls, roof containment system.
Data:
Polyurethane sandwich board bond strength is not less than 0.09 MPa, sandwich board combustion performance achieve B1 level, flexural bearing capacity of sandwich board deflection for Lo / 200 (Lo), the distance between bearings, sandwich plate flexural bearing capacity of not less than 0.5 Kn/m2. Plank effective width is usually mm, the length can be customized.
Process:
Polyurethane sandwich panel production needs to have a continuous production line, advanced sandwich board process for zinc (aluminum zinc plating) inside and outside the color steel plate cold bending forming, intermediate coating polyurethane hard foam composite.
The patent technology of seepage prevention sandwich roofing board, but also the advantages of the polyurethane sandwich board play to the extreme.
The performance characteristics
This product has the following features:
1) low coefficient of thermal conductivity of polyurethane sandwich panel composite board small coefficient of thermal conductivity, good thermal insulation performance, is currently the best thermal insulation material.
2) plates is beautiful, easy installation
3) polyurethane sandwich board fire retardancy
4) polyurethane sandwich board avirulent insipidity
5) use temperature range
6) waterproof, moisture proof
Polyurethane sandwich panel beautiful shape, the overall effect is good, it integrating bearing, thermal insulation, fire prevention, waterproof, without secondary decoration, convenient installation, short construction period, good comprehensive benefits, have good price advantage, is a kind of widely used, potential energy efficient building palisade materials, it is advocated by the ministry of construction and promotion of a new type of energy-saving plates.