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ASTM C394-00

(Test Method)

Standard Test Method for Shear Fatigue of Sandwich Core Materials

Standard Test Method for Shear Fatigue of Sandwich Core Materials

SIGNIFICANCE AND USE
Usually the most critical stress to which a sandwich panel core is subjected is shear. The effect of repeated shear stresses on the core material can be very important.
These test methods provide a standard method of obtaining the sandwich core shear fatigue properties.
SCOPE
1.1 This test method covers determination of the effect of repeated shear loads on sandwich core materials.
1.2 The values stated in SI units are to be regarded as the standard. The inch-pound units given may be approximate.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
09-Jan-2000
ICS
83.120 - Reinforced plastics
Technical Committee
D30 - Composite Materials
Drafting Committee
D30.09 - Sandwich Construction
Current Stage
Ref Project

Relations

Replaced By
ASTM C394-00(2008) - Standard Test Method for Shear Fatigue of Sandwich Core Materials
Effective Date
01-Mar-2008

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ASTM C394-00 - Standard Test Method for Shear Fatigue of Sandwich Core Materials
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:C394–00
Standard Test Method for
Shear Fatigue of Sandwich Core Materials
This standard is issued under the fixed designation C 394; 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 4.3 Test Fixtures, test fixtures similar to those described in
Test Method C 273.
1.1 This test method covers determination of the effect of
4.4 Micrometer, Gage, or Caliper, capable of measuring
repeated shear loads on sandwich core materials.
accurately to 0.025 mm (0.001 in.).
1.2 The values stated in SI units are to be regarded as the
standard. The inch-pound units given may be approximate.
5. Test Specimens
1.3 This standard does not purport to address all of the
5.1 The test specimens shall be similar to those described in
safety concerns, if any, associated with its use. It is the
Test Method C 273, except that the core material shall be
responsibility of the user of this standard to establish appro-
bonded directly to the fixture plates. The dimensions of the
priate safety and health practices and determine the applica-
specimen shall be such that the line of load action passes
bility of regulatory limitations prior to use.
through the diagonally opposite corners of the core material.
2. Referenced Documents 5.2 The number of test specimens and the method of their
selection depend on the purpose of the particular test under
2.1 ASTM Standards:
consideration. It is recommended that at least five specimens
C 273 Test Method for Shear Properties of Sandwich Core
are used for static control tests, and three specimens for each
Materials
stress level to be tested. For establishment of an S-N curve of
E 4 Practices for Force Verification of Testing Machines
stress versus number of cycles to failure, test at least three
3. Significance and Use
stress levels.
3.1 Usually the most critical stress to which a sandwich
6. Conditioning
panel core is subjected is shear. The effect of repeated shear
6.1 When the physical properties of the component materi-
stresses on the core material can be very important.
als are affected by moisture, bring the test specimens to
3.2 These test methods provide a standard method of
constant weight (61 %) before testing, preferably in a condi-
obtaining the sandwich core shear fatigue properties.
tioning room having temperature and humidity control. Con-
4. Apparatus duct the tests under the same temperature and humidity
conditions. A temperature of 23 6 3°C (73 6 5°F) and a
4.1 Fatigue Testing Machine, any standard constant load
relative humidity of 50 6 5 % are recommended as standard
fatigue testing machine capable of applying a direct stress to
conditions.
the specimen and equipped with a counter. The load measuring
system used shall have an accuracy of 61 % of the indicated
7. Procedure
value. The accuracy of the test machine shall be verified in
7.1 The length and width dimensions of the specimen shall
accordance with Practices E 4.
bemeasuredtothenearest0.25mm(0.01in.)andthethickness
4.2 TestingMachine,anystandarduniversaltestingmachine
dimension to the nearest 0.025 mm (0.001 in.). Weight the
capable of operation at a constant rate of motion of the
specimen to the nearest 0.1 g and calculate the specimen
cross-head. The load measuring system used shall have an
density.
accuracy of 61 % of the indicated value. The accuracy of the
7.2 Before the fatigue tests, test a minimum of five control
test machine shall be verified in accordance with Practices E 4.
specimens statically in a standard test machine in accordance
withTest Method C 273. Use the average of the five specimens
This specification is under the jurisdiction of ASTM Committee D-30 on
as the 100 % level for the fatigue tests.
Composite Materials and is the direct responsibility of Subcommittee D30.09 on
7.3 The stress levels to be tested shall be agreed upon by t
...

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5.1 Often the most critical stress to which a sandwich panel core is subjected is shear. The effect of repeated shear stresses on the core material can be very important, particularly in terms of durability under various environmental conditions.  
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1.1 This test method covers measurement of adhesion (tack) between partially cured (B-staged) composite prepreg and a surface in a peel test, under specified conditions. The test may be conducted to measure tack between a flexible layer of prepreg and another prepreg layer bonded to a rigid substrate (Method I) or a rigid metal substrate (Method II). This test method is primarily geared towards material characterization for automated material layup but can be modified for use with other processes. It is well known that material tack is a function of multiple processing and environmental variables. Permissible composite prepreg materials include carbon, glass, and aramid fibers within a B-staged thermoset resin.  
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5.1 This test method is designed to determine the glass transition temperature of continuous fiber reinforced polymer composites using the DMA method. The DMA Tg value is frequently used to indicate the upper use temperature of composite materials, as well as for quality control of composite materials.
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5.1 The prepreg volatiles content, matrix content, reinforcement content, and filler content of composite prepreg materials are used to control material manufacture and subsequent fabrication processes, and are key parameters in the specification and production of such materials, as well as in the fabrication of products made with such materials.  
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1.4 The technical content of this standard has been stable since 1997 without significant objection from its stakeholders. As there is limited technical support for the maintenance of this standard, changes since that date have been limited to items required to retain consistency with other ASTM D30 Committee standards. The standard therefore should not be considered to include any significant changes in approach and practice since 1997. Future maintenance of the standard will only be in response to specific requests and performed only as technical support allows.  
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5.1 Refer to Guide D8509.
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1.1 This test method determines the fastener pull-through resistance of multidirectional polymer matrix composites reinforced by high-modulus fibers. Fastener pull-through resistance is characterized by the force-versus-displacement response exhibited when a mechanical fastener is pulled through a composite plate, with the force applied perpendicular to the plane of the plate. The composite material forms are limited to continuous-fiber or discontinuous-fiber (tape or fabric, or both) reinforced composites for which the laminate is symmetric and balanced with respect to the test direction. The range of acceptable test laminates and thicknesses is defined in 8.2.  
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1.5.1 Within the text, the inch-pound units are shown in brackets.  
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