ASTM F734-17

Standard Test Method for Shear Strength of Fusion Bonded Polycarbonate Aerospace Glazing Material

SIGNIFICANCE AND USE
5.1 At this writing, aerospace quality extruded transparent polycarbonate material is not available in thicknesses greater than 0.5 in. (12.7 mm). When a requirement exists for sheets thicker than 0.5 in. (12.7 mm), two or more sheets are fusion bonded together to form a single sheet of the desired thickness.  
5.2 The structural integrity of the completed transparency depends on the integrity of the fusion bond. This test applies torsional shear loads to measure the structural integrity of the fusion bond. This test method is considered more reliable and more reproducible than shear tests in tension or compression.
SCOPE
1.1 This test method determines the shear yield strength Fsy   and shear ultimate strength Fsu   of fusion bonds in polycarbonate by applying torsional shear loads to the fusion-bond line.  
1.2 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.  
1.3 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

• Status: Historical
• Publication Date: 31-May-2017
• ICS: 49.025.40 - Rubber and plastics
• Technical Committee: F07 - Aerospace and Aircraft
• Drafting Committee: F07.08 - Transparent Enclosures and Materials

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: F734 − 17
Standard Test Method for
Shear Strength of Fusion Bonded Polycarbonate Aerospace
1
Glazing Material
ThisstandardisissuedunderthefixeddesignationF734;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3.1.4 torsional shear fixture, n—a device used to apply a
shear force in the circular section of the test specimen to
1.1 This test method determines the shear yield strength F
sy
produce a peripherally uniform stress distribution.
and shear ultimate strength F of fusion bonds in polycarbon-
su
ate by applying torsional shear loads to the fusion-bond line.
4. Summary of Test Method
1.2 This standard does not purport to address all of the
4.1 Test specimens are prepared with a fusion bond at the
safety concerns, if any, associated with its use. It is the
center of a polycarbonate laminate joined to two metal test
responsibility of the user of this standard to establish appro-
blocks. A twisting action is applied to one block and the load
priate safety and health practices and determine the applica-
required to fracture the fusion bond is transformed into the
bility of regulatory limitations prior to use.
torsional shear strength of the fusion bond.
1.3 This international standard was developed in accor-
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
2. Referenced Documents
5. Significance and Use
2
2.1 ASTM Standards:
5.1 At this writing, aerospace quality extruded transparent
D618Practice for Conditioning Plastics for Testing polycarbonate material is not available in thicknesses greater
than 0.5 in. (12.7 mm). When a requirement exists for sheets
3. Terminology thicker than 0.5 in. (12.7 mm), two or more sheets are fusion
bondedtogethertoformasinglesheetofthedesiredthickness.
3.1 Definitions of Terms Specific to This Standard:
5.2 The structural integrity of the completed transparency
3.1.1 fusion bond, n—thebondingoftwopiecesofthesame
depends on the integrity of the fusion bond. This test applies
material using heat and pressure.
torsional shear loads to measure the structural integrity of the
3.1.2 shear, n—internal force tangential to the section on
fusion bond. This test method is considered more reliable and
which it acts.
more reproducible than shear tests in tension or compression.
3.1.3 shear strength, n—the maximum allowable stress in a
bodyresultingfromforceswhichtendtocausetwocontiguous
6. Apparatus
parts of the body to slide relative to each other in a direction
NOTE 1—A standard torsional test machine is a suitable substitute for
the apparatus described in this section. The machine shall have variable
parallel to their plane of contact.
angular displacement rates from 8 to 800°/min. (0.14 to 14 rad/min.). If a
torsional test machine is used, the calibration and standardization in
Section 8 shall be disregarded.
1
This practice is under the jurisdiction ofASTM Committee F07 on Aerospace
6.1 Torsional Shear Fixture—Illustrations of the fixture are
andAircraft and is the direct responsibility of Subcommittee F07.08 on Transparent
shown in Figs. 1 and 2.
Enclosures and Materials.
Current edition approved June 1, 2017. Published June 2017. Originally
6.2 Calibration Load Arm—A lever arm with a load pan
approvedin1981.Lastpreviouseditionapprovedin2011asF734–95(2011).DOI:
shallbeprovidedforpurposesofcalibratingthetorsionalshear
10.1520/F0734-17.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or apparatus.
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
6.3 Universal Testing Machine—Anautographicallyrecord-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. ing universal tensile testing machine shall be used to apply a
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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F734 − 17
FIG. 1 Torsional Shear Test Fixture (All Dimensions in Inches)
constant rate of rotation to the torsional shear fixture by means 7.2 Test a minimum of five specimens from each fusion
of the loading cable. The machine shall have variable cross- bondedsheet.Sheetswithmultiplefusionbondsshallhavefive
head rates (from 0.2 in./min [5.08 mm/min] to 20 in./min [508 test specimens tested for each fusion bond interface.
mm/min.]), and a calibrated load measurement mechanism
8. Calibra
...

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: F734 − 95 (Reapproved 2011) F734 − 17
Standard Test Method for
Shear Strength of Fusion Bonded Polycarbonate Aerospace
1
Glazing Material
This standard is issued under the fixed designation F734; 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
1.1 This test method determines the shear yield strength F and shear ultimate strength F of fusion bonds in polycarbonate
sy su
by applying torsional shear loads to the fusion-bond line.
1.2 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.
1.3 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D618 Practice for Conditioning Plastics for Testing
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 fusion bond, n—the bonding of two pieces of the same material using heat and pressure.
3.1.2 shear, n—internal force tangential to the section on which it acts.
3.1.3 shear strength, n—the maximum allowable stress in a body resulting from forces which tend to cause two contiguous parts
of the body to slide relative to each other in a direction parallel to their plane of contact.
3.1.4 torsional shear fixture, n—a device used to apply a shear force in the circular section of the test specimen to produce a
peripherally uniform stress distribution.
4. Summary of Test Method
4.1 Test specimens are prepared with a fusion bond at the center of a polycarbonate laminate joined to two metal test blocks.
A twisting action is applied to one block and the load required to fracture the fusion bond is transformed into the torsional shear
strength of the fusion bond.
1
This practice is under the jurisdiction of ASTM Committee F07 on Aerospace and Aircraft and is the direct responsibility of Subcommittee F07.08 on Transparent
Enclosures and Materials.
Current edition approved Dec. 1, 2011June 1, 2017. Published April 2012June 2017. Originally approved in 1981. Last previous edition approved in 20062011 as F734 – 95
(2006).F734 – 95(2011). DOI: 10.1520/F0734-95R11.10.1520/F0734-17.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. 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

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F734 − 17
5. Significance and Use
5.1 At this writing, aerospace quality extruded transparent polycarbonate material is not available in thicknesses greater than
0.5 in. (12.7 mm). When a requirement exists for sheets thicker than 0.5 in. (12.7 mm), two or more sheets are fusion bonded
together to form a single sheet of the desired thickness.
5.2 The structural integrity of the completed transparency depends on the integrity of the fusion bond. This test applies torsional
shear loads to measure the structural integrity of the fusion bond. This test method is considered more reliable and more
reproducible than shear tests in tension or compression.
6. Apparatus
NOTE 1—A standard torsional test machine may be substituted is a suitable substitute for the apparatus described in this section. The machine shall
have variable angular displacement rates from 8 to 800°/min. (0.14 to 14 rad/min.). If a torsional test machine is used, the calibration and standardization
in Section 8 shouldshall be disregarded.
6.1 Torsional Shear Fixture—Illustrations of the fixture are shown in Figs. 1 and 2.
6.2 Calibration Load Arm—A lever arm with a load pan shall be provided for purposes of calibrating the torsional shear
apparatus.
FIG. 1 Torsional Shear Test Fixture (All Dimensions in Inches)
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F734 − 17
FIG.
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