ASTM C394-00(2008)
(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
Relations
Buy Standard
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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(Reapproved 2008)
Standard Test Method for
Shear Fatigue of Sandwich Core Materials
This standard is issued under the fixed designation C394; 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 cross-head. The load measuring system used shall have an
accuracy of 61 % of the indicated value. The accuracy of the
1.1 This test method covers determination of the effect of
test machine shall be verified in accordance with Practices E4.
repeated shear loads on sandwich core materials.
4.3 Test Fixtures, test fixtures similar to those described in
1.2 The values stated in SI units are to be regarded as the
Test Method C273.
standard. The inch-pound units given may be approximate.
4.4 Micrometer, Gage, or Caliper, capable of measuring
1.3 This standard does not purport to address all of the
accurately to 0.025 mm (0.001 in.).
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
5. Test Specimens
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
5.1 The test specimens shall be similar to those described in
Test Method C273, except that the core material shall be
2. Referenced Documents
bonded directly to the fixture plates. The dimensions of the
2.1 ASTM Standards: specimen shall be such that the line of load action passes
C273 Test Method for Shear Properties of Sandwich Core through the diagonally opposite corners of the core material.
Materials
5.2 The number of test specimens and the method of their
E4 Practices for Force Verification of Testing Machines
selection depend on the purpose of the particular test under
consideration. It is recommended that at least five specimens
3. Significance and Use
are used for static control tests, and three specimens for each
3.1 Usually the most critical stress to which a sandwich
stress level to be tested. For establishment of an S-N curve of
panel core is subjected is shear. The effect of repeated shear
stress versus number of cycles to failure, test at least three
stresses on the core material can be very important.
stress levels.
3.2 These test methods provide a standard method of
6. Conditioning
obtaining the sandwich core shear fatigue properties.
6.1 When the physical properties of the component materi-
4. Apparatus
als are affected by moisture, bring the test specimens to
4.1 Fatigue Testing Machine, any standard constant load
constant weight (61 %) before testing, preferably in a condi-
fatigue testing machine capable of applying a direct stress to
tioning room having temperature and humidity control. Con-
the specimen and equipped with a counter. The load measuring
duct the tests under the same temperature and humidity
system used shall have an accuracy of 61 % of the indicated
conditions. A temperature of 23 6 3°C (73 6 5°F) and a
value. The accuracy of the test machine shall be verified in
relative humidity of 50 6 5 % are recommended as standard
accordance with Practices E4.
conditions.
4.2 TestingMachine,anystandarduniversaltestingmachine
7. Procedure
capable of operation at a constant rate of motion of the
7.1 The length and width dimensions of the specimen shall
bemeasuredtothenearest0.25mm(0.01in.)andthethickness
This test method is under the jurisdiction of ASTM Committee D30 on
dimension to the nearest 0.025 mm (0.001 in.). Weight the
Composite Materials and is the direct responsibility of Subcommittee D30.09 on
Sandwich Construction.
specimen to the nearest 0.1 g and calculate the specimen
Current edition approved March 1, 2008. Published April 2008. Originally
density.
approved in 1957. Last previous edition approved in 2000 as C394 – 00 . DOI:
10.1520/C0394-00R08.
7.2 Before the fatigue tests, test a minimum of five control
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
specimens statically in a standard test machine in accordance
contact ASTM Customer Service at service@astm.org. For An
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:C394–00 Designation: C 394 – 00 (Reapproved 2008)
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
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.
2. Referenced Documents
2.1 ASTM Standards:
C 273 Test Method for Shear Properties of Sandwich Core Materials
E 4 Practices for Force Verification of Testing Machines
3. Significance and Use
3.1 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.
3.2 These test methods provide a standard method of obtaining the sandwich core shear fatigue properties.
4. Apparatus
4.1 Fatigue Testing Machine, any standard constant load fatigue testing machine capable of applying a direct stress to the
specimen and equipped with a counter. The load measuring system used shall have an accuracy of 61 % of the indicated value.
The accuracy of the test machine shall be verified in accordance with Practices E 4.
4.2 Testing Machine, any standard universal testing machine capable of operation at a constant rate of motion of the cross-head.
The load measuring system used shall have an accuracy of 61 % of the indicated value. The accuracy of the test machine shall
be verified in accordance with Practices E 4.
4.3 Test Fixtures, test fixtures similar to those described in Test Method C 273.
4.4 Micrometer, Gage, or Caliper , capable of measuring accurately to 0.025 mm (0.001 in.).
5. Test Specimens
5.1 The test specimens shall be similar to those described in Test Method C 273, except that the core material shall be bonded
directlytothefixtureplates.Thedimensionsofthespecimenshallbesuchthatthelineofloadactionpassesthroughthediagonally
opposite corners of the core material.
5.2 The number of test specimens and the method of their selection depend on the purpose of the particular test under
consideration. It is recommended that at least five specimens are used for static control tests, and three specimens for each stress
level to be tested. For establishment of an S-N curve of stress versus number of cycles to failure, test at least three stress levels.
6. Conditioning
6.1 When the physical properties of the component materials are affected by moisture, bring the test specimens to constant
weight (61 %) before testing, preferably in a conditioning room having temperature and humidity control. Conduct the tests under
This specification is under the jurisdiction of ASTM Committee D-30 on Composite Materials and is the direct responsibility of Subcommittee D30.09 on Sandwich
Construction.
Current edition approved Jan. 10, 2000. Published April 2000. Originally published as C394–57T. Last previous edition C394–94 .
This test method is under the jurisdiction of ASTM Committee D30 on Composite Materials and is the direct responsibility of Subcommittee D30.09 on Sandwich
Construction.
Current edition approved March 1, 2008. Published April 2008. Originally approved in 1957. Last previous edition approved in 2000 as C 394 – 00 .
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book ofASTM Standards
, Vol 15.03.volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.