ASTM C273-00e1

Standard Test Method for Shear Properties of Sandwich Core Materials

SCOPE
1.1 This test method covers the determination of shear properties of sandwich construction core materials associated with shear distortion of planes parallel to the facings. It covers the determination of shear strength parallel to the plane of the sandwich, and the shear modulus associated with strains in a plane normal to the facings. The test may be conducted on core materials bonded directly to the loading plates or the sandwich facings bonded to the plates.  
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: 24-Jul-2000
• ICS: 83.120 - Reinforced plastics
• Technical Committee: D30 - Composite Materials
• Drafting Committee: D30.09 - Sandwich Construction

Relations

• Referred By: ASTM F1839-08(2021) - Standard Specification for Rigid Polyurethane Foam for Use as a Standard Material for Testing Orthopaedic Devices and Instruments
• Effective Date: 25-Jul-2000
• Referred By: ASTM C481-99(2016) - Standard Test Method for Laboratory Aging of Sandwich Constructions
• Effective Date: 25-Jul-2000
• Referred By: ASTM D7250/D7250M-20 - Standard Practice for Determining Sandwich Beam Flexural and Shear Stiffness
• Effective Date: 25-Jul-2000
• Referred By: ASTM D1037-12(2020) - Standard Test Methods for Evaluating Properties of Wood-Base Fiber and Particle Panel Materials
• Effective Date: 25-Jul-2000
• Referred By: ASTM C393/C393M-20 - Standard Test Method for Core Shear Properties of Sandwich Constructions by Beam Flexure
• Effective Date: 25-Jul-2000

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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.
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Designation:C273–00
Standard Test Method for
Shear Properties of Sandwich Core Materials
This standard is issued under the fixed designation C 273; 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.
This standard has been approved for use by agencies of the Department of Defense.
1 2 2
´ NOTE—In 5.3, the value 6 000 000 lb-in. /in. was editorially corrected to 600 000 lb-in. /in. in July 2000.
1. Scope shear stress at proportional limit, at yield, or at maximum load)
and to compute an effective core shear modulus.
1.1 This test method covers the determination of shear
3.2 The test does not produce pure shear, but the specimen
properties of sandwich construction core materials associated
length is prescribed so that secondary stresses have a minimum
with shear distortion of planes parallel to the facings. It covers
effect.Approximate shear properties can also be obtained from
the determination of shear strength parallel to the plane of the
a sandwich flexure test (see Test Method C 393).
sandwich, and the shear modulus associated with strains in a
3.3 This test method provides a standard method of obtain-
plane normal to the facings.The test may be conducted on core
ing sandwich core shear data for quality control, acceptance
materials bonded directly to the loading plates or the sandwich
specification testing, sandwich design, and research and devel-
facings bonded to the plates.
opment.
1.2 The values stated in SI units are to be regarded as the
standard. The inch-pound units given may be approximate.
4. Apparatus
1.3 This standard does not purport to address all of the
4.1 Test Machine, capable of maintaining a controlled load-
safety concerns, if any, associated with its use. It is the
ing rate and indicating the load with an accuracy of 61%of
responsibility of the user of this standard to establish appro-
the indicated value. The accuracy of the test machine shall be
priate safety and health practices and determine the applica-
verified in accordance with PracticesE4.
bility of regulatory limitations prior to use.
4.2 Deflectometer, compressometer, or extensometer, ca-
2. Referenced Documents pableofmeasuringthedisplacementwithaprecisionofatleast
61%.
2.1 ASTM Standards:
4.3 Micrometer, gage, or caliper, capable of measuring
C 393 Test Method for Flexural Properties of Flat Sandwich
accurately to 0.025 mm (0.001 in.).
Constructions
C 394 Test Method for Shear Fatigue of Sandwich Core
5. Test Specimens
Materials
3 5.1 The test specimen shall have a thickness equal to the
E4 Practices for Force Verification of Testing Machines
thickness of the sandwich, a width not less than 50 mm (2 in.),
3. Significance and Use and a length not less than twelve times the thickness, except as
agreed upon by the purchaser and the seller.
3.1 The core shear properties are fundamental properties
5.2 Measure the thickness to the nearest 0.025 mm (0.001
thatareusedinthedesignofsandwichpanels.Thistestmethod
in.) and the length and width to the nearest 0.25 mm (0.01 in.).
provides information on the load-deflection behavior of sand-
Weigh the specimen to the nearest 0.1 g and calculate the
wichconstructionsorcoreswhenloadedinshearparalleltothe
specimen density.
plane of the facings. From a complete load-deflection curve, it
5.3 The test specimen shall be rigidly supported by means
is possible to compute core shear stress at any load (such as the
of steel plates bonded to the facings (Note 1) as shown in Fig.
1.The thickness of the plates may be varied in accordance with
the strength of the sandwich, but the plate length shall be such
This test method is under the jurisdiction of ASTM Committee D30 on
that the line of action of the direct tensile or compressive force
Composite Materials and is the direct responsibility of Subcommittee D30.09 on
Sandwich Construction.
shall pass through the diagonally opposite corners of the
Current edition approved Jan. 10, 2000. Published March 2000. Originally
sandwich as shown in Fig. 1.Acorrect line of load action may
published as C 273 – 51T. Last previous edition C 273 – 94.
alsobeobtainedbymodifyingthecorelengthtothicknessratio
Annual Book of ASTM Standards, Vol 15.03.
Annual Book of ASTM Standards, Vol 03.01. provided the requirements in 5.1 are fulfulled. It has been
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C273–00
NOTE 2—A suggested rate of cross-head movement is 0.50 mm/min
(0.020 in./min).
7.2 The failure mode desired is a 100 % shear failure of the
core. Specimens that exhibit cohesive failures of the core-to-
plate adhesive or adhesion failures to the core or plates should
be rejected. The thickness of the adhesive bond to honeycomb
core (adhesive-filled depth into the honeycomb core cells) may
affect the core shear strength and modulus values depending
...