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ASTM C480-99(2005)

(Test Method)

Standard Test Method for Flexure Creep of Sandwich Constructions

Standard Test Method for Flexure Creep of Sandwich Constructions

SIGNIFICANCE AND USE
The determination of the creep rate provides information on the behavior of sandwich constructions under constant load. Creep is defined as deflection under constant load over a period of time beyond the initial deformation as a result of the application of the load. Deflection data obtained from this test method can be plotted against time, and a creep rate determined. By using standard specimen constructions and constant loading, the test method may also be used to evaluate creep behavior of sandwich panel core-to-facing adhesives.
This test method provides a standard method of obtaining flexure creep of sandwich constructions for quality control, acceptance specification testing, and research and development.
SCOPE
1.1 This test method covers the determination of the creep characteristics and creep rate of sandwich constructions loaded in flexure, at any desired temperature.  
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
28-Feb-2005
ICS
83.120 - Reinforced plastics
Technical Committee
D30 - Composite Materials
Drafting Committee
D30.09 - Sandwich Construction
Current Stage
Ref Project

Relations

Replaces
ASTM C480-99 - Standard Test Method for Flexure Creep of Sandwich Constructions
Effective Date
01-Mar-2005
Replaced By
ASTM C480/C480M-08 - Standard Test Method for Flexure Creep of Sandwich Constructions
Effective Date
01-Sep-2008
Referred By
ASTM C1484-10(2018) - Standard Specification for Vacuum Insulation Panels
Effective Date
01-Mar-2005

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ASTM C480-99(2005) - Standard Test Method for Flexure Creep of Sandwich ConstructionsASTM C480-99(2005) - Standard Test Method for Flexure Creep of Sandwich Constructions
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ASTM C480-99(2005) - Standard Test Method for Flexure Creep of Sandwich Constructions
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Please contact ASTM International (www.astm.org) for the latest information.
Designation: C 480 – 99 (Reapproved 2005)
Standard Test Method for
1
Flexure Creep of Sandwich Constructions
This standard is issued under the fixed designation C 480; 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 (ϵ) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Apparatus
1.1 This test method covers the determination of the creep 4.1 The apparatus for loading the specimen shall conform to
characteristics and creep rate of sandwich constructions loaded Test Method C 393C 393 except that a constant load shall be
in flexure, at any desired temperature. applied by means of weights and a lever system. Fig. 1 shows
1.2 The values stated in SI units are to be regarded as the a lever and weight-loading apparatus that has been found
standard. The inch-pound units given may be approximate. satisfactory.
1.3 This standard does not purport to address all of the 4.2 Micrometer, gage, or caliper, capable of measuring
safety concerns, if any, associated with its use. It is the accurately to 0.025 mm (0.001 in.).
responsibility of the user of this standard to establish appro-
5. Test Specimens
priate safety and health practices and determine the applica-
5.1 The test specimen shall be of sandwich construction of
bility of regulatory limitations prior to use.
a size and proportions conforming to the flexure test specimen
2. Referenced Documents
described in Test Method C 393C 393.
2
2.1 ASTM Standards: 5.2 The number of test specimens and the method of their
C 393 Test Method for Flexural Properties of Sandwich selection depend on the purpose of the particular test under
Constructions consideration, and no general rule can be given to cover all
cases. However, when specimens are to be used for acceptance
3. Significance and Use
tests, at least three specimens shall be tested.
3.1 The determination of the creep rate provides informa-
6. Conditioning
tion on the behavior of sandwich constructions under constant
load. Creep is defined as deflection under constant load over a 6.1 When the test is performed at room temperature and the
period of time beyond the initial deformation as a result of the physical properties of the component materials are affected by
application of the load. Deflection data obtained from this test moisture, bring the test specimens to constant weight (61%)
method can be plotted against time, and a creep rate deter- before testing, preferably in a conditioning room with tempera-
mined. By using standard specimen constructions and constant ture and humidity control. The tests, preferably, should be
loading, the test method may also be used to evaluate creep madeinaroomunderthesameconditions.Atemperatureof23
behavior of sandwich panel core-to-facing adhesives. 6 3°C (73 6 5°F) and a relative humidity of 50 6 5 % are
3.2 This test method provides a standard method of obtain- recommended for standard control conditions.
ing flexure creep of sandwich constructions for quality control,
7. Procedure
acceptance specification testing, and research and develop-
ment. 7.1 Measure the dimensions of the specimens in millimetres
(inches) to a precision of60.5 %.
7.2 The load applied to the specimen by the lever system
1
This specification is under the jurisdiction of ASTM Committee D30 on
shown in Fig. 1 may be calculated as follows:
Composite Materials and is the direct responsibility of Subcommittee D30.09 on
Sandwich Construction.
WM1wB
P5 1 p (1)
Current edition approved Mar. 1, 2005. Published March 2005. Originally
A
approved in 1961. Last previous edition approved in 1999 as C 480 – 99.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards 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.
1

---------------------- Page: 1 ----------------------
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Please contact ASTM International (www.astm.org) for the latest information.
C 480 – 99 (2005)
portion of the curve (beyond the initial deformation) by
obtaining the difference of the two deflections and dividing by
the period of time.
8.2 For comparison of materials, the creep deflection may
be expressed as a percentage of the initial deflection after a
period of time as follows:
D2 d
Creep, % of original deflection5 3 100 (2)
d
FIG. 1 Creep Test Apparatus and Loading System
where:
D = total deflection under constant load at time t, mm (in.)
where:
P =
...

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5.2.2 To compare quantitatively the relative values of the damage resistance parameters for sandwich constructions with different facing, core or adhesive materials. The damage response parameters can include dent depth, damage dimensions and location(s), indentation or impact force magnitudes, impact energy magnitudes, as well as the force versus time curve.  
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1.5 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not ...

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