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ASTM C480-99

(Test Method)

Standard Test Method for Flexure Creep of Sandwich Constructions

Standard Test Method for Flexure Creep of Sandwich Constructions

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
09-Oct-1999
ICS
83.120 - Reinforced plastics
Technical Committee
D30 - Composite Materials
Drafting Committee
D30.09 - Sandwich Construction
Current Stage
Ref Project

Relations

Replaced By
ASTM C480-99(2005) - Standard Test Method for Flexure Creep of Sandwich Constructions
Effective Date
01-Mar-2005
Referred By
ASTM C1484-10(2018) - Standard Specification for Vacuum Insulation Panels
Effective Date
10-Oct-1999

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ASTM C480-99 - 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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:C480–99
Standard Test Method for
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 (e) 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 393 except that a constant load shall be applied
in flexure, at any desired temperature. by means of weights and a lever system. Fig. 1 shows a lever
1.2 The values stated in SI units are to be regarded as the and weight-loading apparatus that has been found satisfactory.
standard. The inch-pound units given may be approximate. 4.2 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
5. Test Specimens
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- 5.1 The test specimen shall be of sandwich construction of
a size and proportions conforming to the flexure test specimen
bility of regulatory limitations prior to use.
described in Test Method C 393.
2. Referenced Documents
5.2 The number of test specimens and the method of their
2.1 ASTM Standards: selection depend on the purpose of the particular test under
C 393 Test Method for Flexural Properties of Flat Sandwich consideration, and no general rule can be given to cover all
Constructions cases. However, when specimens are to be used for acceptance
tests, at least three specimens shall be tested.
3. Significance and Use
6. Conditioning
3.1 The determination of the creep rate provides informa-
tion on the behavior of sandwich constructions under constant 6.1 When the test is performed at room temperature and the
load. Creep is defined as deflection under constant load over a physical properties of the component materials are affected by
period of time beyond the initial deformation as a result of the moisture, bring the test specimens to constant weight (61%)
application of the load. Deflection data obtained from this test before testing, preferably in a conditioning room with tempera-
method can be plotted against time, and a creep rate deter- ture and humidity control. The tests, preferably, should be
mined. By using standard specimen constructions and constant madeinaroomunderthesameconditions.Atemperatureof23
loading, the test method may also be used to evaluate creep 6 3°C (73 6 5°F) and a relative humidity of 50 6 5 % are
behavior of sandwich panel core-to-facing adhesives. recommended for standard control conditions.
3.2 This test method provides a standard method of obtain-
7. Procedure
ing flexure creep of sandwich constructions for quality control,
7.1 Measure the dimensions of the specimens in millimetres
acceptance specification testing, and research and develop-
ment. (inches) to a precision of 60.5 %.
7.2 The load applied to the specimen by the lever system
shown in Fig. 1 may be calculated as follows:
WM 1wB
This specification is under the jurisdiction of ASTM Committee D-30 on
P 5 1 p (1)
Composite Materials and is the direct responsibility of Subcommittee D30.09 on
A
Sandwich Construction.
Current edition approved Oct. 10, 1999. Published February 2000. Originally
where:
published as C 480 – 61T. Last previous edition C 480 – 62 (1999).
P 5 load applied to specimen, N (lb);
Annual Book of ASTM Standards, Vol 15.03.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
C480
D 2 d
W 5 weight (including tray mass), N (l
...

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5.1 The determination of the creep rate provides information on the behavior of sandwich constructions under constant applied force. Creep is defined as deflection under constant force over a period of time beyond the initial deformation as a result of the application of the force. 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.  
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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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1.1 This test method covers the procedure for the determination of the dry or wet (moisture conditioned) glass transition temperature (Tg) of polymer matrix composites containing high-modulus, 20 GPa (> 3 × 106 psi), fibers using a dynamic mechanical analyzer (DMA) under flexural oscillation mode, which is a specific subset of the Dynamic Mechanical Analysis (DMA) method.  
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5.1 Refer to Guide D8509.
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