Hexcel honeycomb HEXCELS^ Composites

99HXDH1679 Rv. HW HC Guide v.2 11/24/99 2:37 PM Page 3 HexWeb Honeycomb Attributes and Properties Contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 How Honeycomb Is Manufactured . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Honeycomb Cell Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

99HXDH1679 Rv. HW HC Guide v.2 Contents 11/24/99 2:37 PM Page 4 cont. Comparison of Typical Mechanical Properties and Other Design Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Additional Properties of Honeycomb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Acoustical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28 Air/Fluid Directionalization...

HexWeb Honeycomb Attributes and Properties Hexcel has produced more than 700 varieties of honeycomb over the past 50 years.Today, HexWeb honeycomb is available in a wide range of materials and cell configurations, and additional products are continually developed in response to new uses for honeycomb sandwich construction. This brochure lists the materials, configurations, and mechanical properties of Hexcel's standard honeycomb as a guide to selecting honeycomb core best suited for particular applications. Solid Metal Relative Stiffness 7 times more rigid 37 times more rigid! Relative Strength...

99HXDH1679 Rv. HW HC Guide v.2 11/24/99 2:37 PM Page 6 How Honeycomb Is Manufactured Honeycomb is made primarily by the expansion method.The corrugated process is most common for high density honeycomb materials. Expansion Process of Honeycomb Manufacture Roll Web Sheet HOBE Block HOBE Slice Adhesive Expanded Sheet Expansion Process The honeycomb fabrication process by the expansion method begins with the stacking of sheets of the substrate material on which adhesive node lines have been printed.The adhesive lines are then cured to form a HOBE® (HOneycomb Before Expansion) block. The HOBE block...

HexWeb Honeycomb Attributes and Properties Honeycomb Cell Configurations Hexagonal Core The standard hexagonal honeycomb is the basic and most common cellular honeycomb configuration, and is currently available in all metallic and nonmetallic materials. The OX configuration is a hexagonal honey- comb that has been overexpanded in the W direction, providing a rectangular cell configuration that facilitates curving or forming in the L direction. The OX process increases W shear properties and decreases L shear properties when compared to hexagonal Reinforced Hexagonal Core Reinforced honeycomb...

The Flex-Core cell configuration provides for exceptional formability in compound curvatures with reduced anticlastic curvature and without buckling the cell walls. Curvatures of very tight radii are easily formed. When formed into tight radii, Flex-Core provides higher shear strengths than comparable hexagonal core of equivalent density. Flex-Core is manufactured from aluminum, Nomext and fiberglass substrates. Double-Flex is a unique large cell Flex-Core for excellent formability and high specific compression properties. Double-Flex is the most formable cell configuration. Tube-Core configuration...

HexWeb Honeycomb Attributes and Properties Honeycomb Materials Aluminum Honeycomb Hexcel aluminum honeycombs are designated as Material - Cell Size - Alloy - Foil Thickness - Density ' - signifies the honeycomb is treated with a corrosion-resistant coating - is the cell size in fractions of an inch is the aluminum alloy used is the nominal reference foil thickness in - indicates the cell walls are nonperforated - is the density in pounds per cubic foot Corrosion-Resistant Coatings Corrosion-resistant coatings consist of a base layer underlying a primer layer. Aluminum honeycomb is available with...

Fiberglass Reinforced Honeycomb Hexcel fiberglass reinforced honeycombs are Material - Cell Size - Density HRP® - refers to the type of material 3/16 - is the cell size in fractions of an inch 4.0 - is the nominal density in pounds HRP is a fiberglass fabric reinforced honeycomb dipped in a heat-resistant phenolic resin to achieve the final density. This product was developed for use at service temperatures up to 350°E However, it is also well suited for short exposures at higher temperatures. The HRP-series honeycomb is available in the standard hexagonal configuration, as well as in the two...

HexWeb Honeycomb Attributes and Properties KOREX honeycomb is made from KOREX aramid paper dipped in a heat-resistant phenolic resin to achieve the final density. KOREX honeycomb offers improved strength-to-weight ratios and/or lower moisture absorp- tion than Nomex honeycomb of a similar configuration. Special Honeycomb_ HFT-G is a bias weave carbon fabric reinforced honeycomb dipped in either a heat-resistant phenolic resin or a polyimide resin to achieve the final density. This product was developed for use at service tempera- tures up to 500°E However, it is well suited for short exposures...

Specifying Honeycomb_ When honeycomb is specified, the following informa- tion needs to be provided: • Cell configuration (hexagonal, OX-Core, Flex-Core, etc.) • Cell size • Alloy and foil gauge (aluminum honeycomb only) Cell sizes range from 1/16" to 1", with 1/8", 3/16", 1/4", and 3/8" being the most common. Honeycomb densi- ties range from 1.0 lb/ft3 to 55 lb/ft3. Guide to Determining Which Type Determining which type of honeycomb to specify requires that the relevant possible attributes be defined for the application. The attributes that help determine the most appropriate honeycomb type...