ASTM D8453/D8453M-22
(Practice)Standard Practice for Open-Hole Flexural Strength of Sandwich Constructions
Standard Practice for Open-Hole Flexural Strength of Sandwich Constructions
SIGNIFICANCE AND USE
5.1 This practice provides supplemental instructions that allow the use of Test Method D7249/D7249M to determine the open-hole (notched) strength of the sandwich panel facesheets for structural design allowables, material specifications, and research and development. Due to the curvature of the flexural test specimen when loaded, the open-hole sandwich facesheet strength from this test may not be equivalent to the open-hole sandwich facesheet strength of sandwich structures subjected to pure edgewise (in-plane) tension or compression.
5.2 Factors that influence the notched facesheet strength and shall therefore be reported include the following: facesheet material, core material, adhesive material, methods of material fabrication, facesheet stacking sequence and overall thickness, core geometry (cell size), core density, adhesive thickness, specimen geometry (including hole diameter, diameter-to-thickness ratio, and width-to-diameter ratio), specimen preparation (especially of the hole), specimen conditioning, environment of testing, specimen alignment, loading procedure, speed of testing, facesheet void content, adhesive void content, and facesheet volume percent reinforcement. Further, notched facesheet strength may be different between precured/bonded and co-cured facesheets of the same material.
SCOPE
1.1 This practice provides instructions for modifying the long beam flexure test method to determine open-hole facesheet properties of flat sandwich constructions subjected to flexure in such a manner that the applied moments produce curvature of the sandwich facesheet planes and result in compressive and tensile forces in the facesheets. Permissible core material forms include those with continuous bonding surfaces (such as balsa wood and foams) as well as those with discontinuous bonding surfaces (such as honeycomb). This practice supplements Test Method D7249/D7249M with provisions for testing specimens that contain a centrally located through-hole.
1.2 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 may not be exact equivalents; therefore, to enforce conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.
1.2.1 Within the text, the inch-pound units are shown in brackets.
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Relations
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D8453/D8453M − 22
Standard Practice for
1
Open-Hole Flexural Strength of Sandwich Constructions
This standard is issued under the fixed designation D8453/D8453M; 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 2. Referenced Documents
2
2.1 ASTM Standards:
1.1 This practice provides instructions for modifying the
D3410/D3410M Test Method for Compressive Properties of
long beam flexure test method to determine open-hole
Polymer Matrix Composite Materials with Unsupported
facesheet properties of flat sandwich constructions subjected to
Gage Section by Shear Loading
flexure in such a manner that the applied moments produce
D3878 Terminology for Composite Materials
curvature of the sandwich facesheet planes and result in
D5687/D5687M Guide for Preparation of Flat Composite
compressive and tensile forces in the facesheets. Permissible
Panels with Processing Guidelines for Specimen Prepara-
core material forms include those with continuous bonding
tion
surfaces (such as balsa wood and foams) as well as those with
D7249/D7249M Test Method for Facesheet Properties of
discontinuous bonding surfaces (such as honeycomb). This
Sandwich Constructions by Long Beam Flexure
practice supplements Test Method D7249/D7249M with pro-
E6 Terminology Relating to Methods of Mechanical Testing
visions for testing specimens that contain a centrally located
E122 Practice for Calculating Sample Size to Estimate,With
through-hole.
Specified Precision, the Average for a Characteristic of a
1.2 Units—The values stated in either SI units or inch- Lot or Process
E177 Practice for Use of the Terms Precision and Bias in
pound units are to be regarded separately as standard. The
ASTM Test Methods
values stated in each system may not be exact equivalents;
E456 Terminology Relating to Quality and Statistics
therefore, to enforce conformance with the standard, each
system shall be used independently of the other, and values
3. Terminology
from the two systems shall not be combined.
3.1 Definitions—Terminology D3878 defines terms relating
1.2.1 Within the text, the inch-pound units are shown in
to high-modulus fibers and their composites, as well as terms
brackets.
relating to sandwich constructions. Terminology E6 defines
1.3 This standard does not purport to address all of the
terms relating to mechanical testing. Terminology E456 and
safety concerns, if any, associated with its use. It is the
Practice E177 define terms relating to statistics. In the event of
responsibility of the user of this standard to establish appro-
a conflict between terms, Terminology D3878 shall have
priate safety, health, and environmental practices and deter-
precedence over the other standards.
mine the applicability of regulatory limitations prior to use.
3.2 Definitions of Terms Specific to This Standard:
1.4 This international standard was developed in accor-
NOTE 1—If the term represents a physical quantity, its analytical
dance with internationally recognized principles on standard-
dimensionsarestatedimmediatelyfollowingtheterm(orlettersymbol)in
ization established in the Decision on Principles for the
fundamental dimension form, using the following ASTM standard sym-
Development of International Standards, Guides and Recom-
bology for fundamental dimensions, shown within square brackets: [M]
mendations issued by the World Trade Organization Technical for mass, [L] for length, [T] for time, [θ] for thermodynamic temperature,
and [nd] for nondimensional quantities. Use of these symbols is restricted
Barriers to Trade (TBT) Committee.
to analytical dimensions when used with square brackets, as the symbols
may have other definitions when used without the brackets.
1
This practice is under the jurisdiction ofASTM Committee D30 on Composite
2
Materials and is the direct responsibility of Subcommittee D30.09 on Sandwich For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Construction. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Current edition approved Nov. 1, 2022. Published December 2022. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D8453_D8453M-22. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D8453/D8453M − 22
3.2.1 diameter-to-facesheet thickness ra
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.