ASTM C274-07

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Designation:C274 −07
StandardTerminology of
1
Structural Sandwich Constructions
This standard is issued under the fixed designation C274; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope face dimpling,n—buckling of the compressive facing into the
individual cells of the honeycomb core due to compressive
1.1 This terminology covers terms necessary for a basic
loading or the prepreg facing sagging into the individual
uniform understanding and usage of the language peculiar to
honeycomb cells during cocure.
structural sandwich constructions. The simplest structural
sandwich is a three layered construction formed by bonding a
face wrinkling,n—buckling of the compressive facing into or
thin layer (facing) to each side of a thick layer (core).
away from the core. This progresses the width of the panel
and causes failure.
2. Terminology
co-curing,n—curing a composite laminate and simultaneously
facing, n—the outermost layer or composite component of a
bonding it to the sandwich core.
sandwich construction, generally thin and of high density,
which resists most of the edgewise loads and flatwise
co-fab,n—fabrication process where close-outs and inserts are
bending moments: synonymous with face, skin and
bonded into the panel the same time the facings are bonded
facesheet.
to the core.
core,n—a centrally located layer of a sandwich construction, inserts, n—apparatus placed into the sandwich for attaching
usually low density, which separates and stabilizes the
items: synonymous with hard points.
facings and transmits shear between the facings and provides
shear crimping,n—buckling of the compressive facing due to
most of the shear rigidity of the construction.
low core shear modulus. Usually causes the core to fail in
doublers, n—an extra piece of facing attached to strength or
shear at the crimp.
stiffen the panel or to distribute the load more widely to the
core.
structural sandwich construction,n—a lamin
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