ASTM C274-99

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Designation:C274–99
Standard Terminology of
Structural Sandwich Constructions
This standard is issued under the fixed designation C 274; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope a support or another panel.
facingdelamination, n—where the facing becomes disbonded
1.1 This terminology covers terms necessary for a basic
from the core.
uniform understanding and usage of the language peculiar to
face dimpling, n—buckling of the compressive facing into the
structural sandwich constructions. The simplest structural
individual cells of the honeycomb core due to compressive
sandwich is a three layered construction formed by bonding a
loading or the prepreg facing sagging into the individual
thin layer (facing) to each side of a thick layer (core).
honeycomb cells during cocure.
2. Referenced Documents face wrinkling, n—buckling of the compressive facing into or
away from the core. This progresses the width of the panel
2.1 ASTM Standards:
and causes failure.
D 907 Terminology of Adhesives
facing, n—the outermost layer or composite component of a
3. Terminology
sandwich construction, generally thin and of high density,
which resists most of the edgewise loads and flatwise
adhesive,n—asubstancecapableofholdingmaterialstogether
bending moments: synonymous with face, skin and
by surface attachment.
facesheet.
DISCUSSION—This definition was established in Terminology D 907.
inplane loads, n—loads which are parallel to the facings.
inserts, n—apparatus placed into the sandwich for attaching
bending stiffness, n—the sandwich property which resists
items: synonymous with hard points.
bending deflections. D=EI; the facing modulus times the
post-fab, n—fabrication process where close-outs and inserts
panel moment of inertia.
are attached or put into the panel after the facings are bonded
co-curing,n—curingacompositelaminateandsimultaneously
to the core.
bonding it to the sandwich core.
shearcrimping, n—buckling of the compressive facing due to
co-fab, n—fabrication process where close-outs and inserts are
low core shear modulus. Usually causes the core to fail in
bonded into the panel the same time the facings are bonded
shear at the crimp.
to the core.
shear rigidity, n—the sandwich property which resists shear
core, n—a centrally located layer of a sandwich construction,
distortions:synonymouswithshearstiffness.U=hG;thecore
usually low density, which separat
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