SAE AMS STD 401 : 1999

SANDWICH CONSTRUCTIONS AND CORE MATERIALS - GENERAL TEST METHODS

SAE International

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1 SCOPE
    1.1 Scope
2 APPLICABLE DOCUMENTS
    2.1 U.S. Government Publications
    2.2 ASTM Publications
3 DEFINITIONS
    3.1 General
          3.1.1 Sandwich
          3.1.2 Core
          3.1.3 Facing
          3.1.4 Flatwise
          3.1.5 Edgewise
          3.1.6 Isotropic
          3.1.7 Orthotropic
                  3.1.7.1 Orthotropic facing directions
                  3.1.7.2 Orthotropic core directions
4 GENERAL REQUIREMENTS
    4.1 Selection of test samples
          4.1.1 Design data
          4.1.2 Quality assurance provisions
                  4.1.2.1 Sampling for the various
                            inspections, examinations and
                            tests
    4.2 Test conditions
    4.3 Test apparatus
    4.4 Report of test results
    4.5 Designation of units of measurement
5 DETAIL TEST METHODS
    5.1 Core Test Methods
          5.1.1 Core Density and Specific Gravity
          5.1.2 Core Moisture Sorption
          5.1.3 Core Thermal Conductivity
          5.1.4 Core Compression
          5.1.5 Core Shear
          5.1.6 Core Tension
          5.1.7 Core Water Migration
          5.1.8 Core Delamination of Honeycomb Core
    5.2 Sandwich test methods
          5.2.1 Sandwich Compression
          5.2.2 Sandwich Shear
          5.2.3 Sandwich Tension
          5.2.4 Sandwich Flexure
          5.2.5 Sandwich Thermal Conductivity
          5.2.6 Sandwich Peel
    5.3 Fatigue Tests
    5.4 Creep Characteristics
FIGURES
1 Axes notation for sandwich cores
2 Sketch showing shear specimens attached to loading plates
    and plane of action of applied loads
3 Compression test apparatus showing an adjustable
    supporting base and slotted round bars in position on
    the specimen ends. Deformations are being measured
    with Marten's mirror compressometers
4 Test apparatus for tension flatwise test of core
    material for sandwich-type constructions showing
    specimens and fitting for applying load
5 Apparatus for conducting flexure test of sandwich
    peel test
6 Type of apparatus suitable for making sandwich peel test
7 Possible modes of failure of sandwich composite under
    edgewise loads: General buckling, shear crimping,
    dimpling of facings, and wrinkling of facings either
    away from or into the core
8 Apparatus for node strength tests

Abstract

Describes the general requirements and procedures for testing sandwich core materials and for testing sandwich construction of the types used mainly in aircraft structures. Not inclusive of test procedures which apply only to a specified product, as these are included in detailed product specifications.