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honeycomb core failure

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Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0009083
EISBN: 978-1-62708-177-1
... step. Fig. 5 Micrographs of an unprepared honeycomb sandwich composite structure after climbing drum peel testing showing the adhesive surface after failure and the separated honeycomb core. Dark-field illumination, 65 mm macrophotograph Fig. 7 Micrograph of honeycomb core (cell...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003388
EISBN: 978-1-62708-195-5
... of describing the structural analysis of sandwich panels, a honeycomb core panel with beveled core edges, as shown in Fig. 1 , is used. The methods developed for the analysis of honeycomb sandwich panels of this type offer an example for describing the various failure modes of sandwich construction...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003489
EISBN: 978-1-62708-195-5
..., and honeycomb processing, including perimeter trimming, mechanical forming, heat forming, core splicing, contouring, and cleaning. The article presents basic steps involved in the adhesive-bonding process and concludes with a discussion on adhesive applications and tooling. adhesive adhesive bonded...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006457
EISBN: 978-1-62708-190-0
... that leads to adhesion failures is caused by improper cleaning of the honeycomb core prior to bonding. This condition results if glycol (which is often used to support the core when it is machined) is not completely removed prior to bonding. Incomplete removal of glycol will cause a weak bond to exist...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003457
EISBN: 978-1-62708-195-5
... thickness criteria based on realistic impact energy levels; avoid self-adhesive prepregs when bonding to sandwich core; avoid fasteners penetrating into the core; potting around fasteners sufficient diameter; potting susceptible to cracking over time, or to moisture absorption; avoid square-edge honeycomb...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003455
EISBN: 978-1-62708-195-5
... layers of unidirectional AS4/3501-6 tape aligned in the ±45° directions with respect to the 0° reference of the leading and trailing edges of the spoiler. It has a full-depth honeycomb core of 4.8 mm ( 3 16 in.) hexagonal cell size. Most of the in-service damage is expected to consist of small...
Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002194
EISBN: 978-1-62708-188-7
... in <xref rid="a0002194-f13" ref-type="fig">Fig. 13</xref> Table 6 Machining parameters for milling nonmetallic honeycomb structures using the roughing and finishing tools shown in Fig. 13 Honeycomb core material Cell size Density Feed rate Roughing Finishing mm in. kg/m 3 lb/ft 3 mm/min in./min mm/min in./min...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003467
EISBN: 978-1-62708-195-5
... plies on either side. The number of plies, their orientation and layup were as specified by the manufacturer. The shear webs were manufactured using Nomex honeycomb core with glass/epoxy skins, which are subsequently bonded to the upper and lower caps. The cross sections of the upper and lower caps...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003459
EISBN: 978-1-62708-195-5
... Reinforcement fibers and fabrics Fiberglass Aramid Carbon Boron Others Reinforcement form Unidirectional tape Woven cloth Weave style Core materials Honeycomb Foam Balsa wood Potting compounds Others Lightning-strike materials Aluminum mesh Copper...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0009071
EISBN: 978-1-62708-177-1
... whereby the composite layers are separated by a lightweight material, making a sandwich structure. Typical materials used for the sandwich materials are honeycomb core or foam materials. Honeycomb core materials are usually based on Nomex (E.I. du Pont de Nemours and Company), glass fiber, aluminum...
Book Chapter

By Greg Kress
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003392
EISBN: 978-1-62708-195-5
... and cause a redistribution of stress that eventually leads to fiber breakage and finally, laminate failure. Damage tolerance can be improved by using toughened resin systems that resist crack propagation. The use of honeycomb core in frequent-impact areas needs to be closely evaluated. The choice...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003475
EISBN: 978-1-62708-195-5
... to their mass. A sandwich structure consists of two thin facesheets separated by and adhesively bonded to a lightweight aluminum honeycomb core. Most often, the facesheets are composite laminates with quasi-isotropic lay-up (e.g., [0/±45/90] s or [0/±60] s ). The facesheets carry the axial loads, bending...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003434
EISBN: 978-1-62708-195-5
... Thickness  Up to 50 mm (2 in.) ±0.15 mm (±0.006 in.)  50–100 mm (2–4 in.) ±0.25 mm (±0.010 in.)  Over 100 mm (4 in.) ±1.6 mm (±0.063 in.) Position ±0.25 mm (±0.010 in.) Chamfer angle ±3° Note: Actual tolerances depend on specific program requirements. Typical honeycomb core...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003456
EISBN: 978-1-62708-195-5
..., or a combination of these materials in an epoxy matrix. The core is typically an aramid or fiberglass paper honeycomb, aluminum honeycomb, foam, or balsa wood material. Sandwich structures composed of a solid laminate plus an equivalent core thickness will be seven times the stiffness and almost four times...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003444
EISBN: 978-1-62708-195-5
... Delamination Strength of Honeycomb Core Materials Peel C 364 Edgewise Compressive Strength of Flat Sandwich Constructions Edgewise compression C 365 Flatwise Compressive Properties of Sandwich Cores Flatwise compression C 393 Flexural Properties of Sandwich Constructions Flexure C 394 Shear...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003395
EISBN: 978-1-62708-195-5
... such as expanded polymer foam, balsa wood, aluminum or Nomex honeycomb, or syntactic closed-cell foams. The face sheets can be formed separately and bonded to the core, cocured with the core, or cured in separate steps layer by layer. Forming core to different contours requires additional fabrication. Foam...
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002492
EISBN: 978-1-62708-194-8
... are used such as balsa wood, aluminum or Nomex honeycomb, or syntactic closed-cell foams. The face sheets can be formed separately and bonded to the core, cocured with the core, or cured in separate steps layer by layer. Forming core to different contours requires additional fabrication. Foam and honeycomb...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003479
EISBN: 978-1-62708-195-5
... process that ensures uniformity, while it eliminates seams and overlaps. Braided skis resist torsion better and weigh 0.45 kg (1 lb) less than hand lay-up skis—due to closer tolerances and less excess resin. Hexcel Corporation is manufacturing Alpine and cross-country skis using honeycomb cores...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001466
EISBN: 978-1-62708-173-3
... preparation. Note exposed fibers and small amount of damaged fibers. 415× Fig. 12 Effect of not predrying organic honeycomb cores. (a) Dried core. (b) Undried core Fig. 7 Imprint of a nylon peel ply left after removal from composite laminate. 58× Fig. 8 Imprint of a peel ply...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003047
EISBN: 978-1-62708-200-6
.... A properly selected adhesive can generally withstand repeated strains induced by cyclic loading without the propagation of failure-producing cracks. Smoothing Contours Adhesives usually do not change the contours of the parts they join. Unlike screws, rivets, or bolts, adhesives give little...