Standard Practice for Tensile Properties of Tapered and Stepped Joints of Polymer Matrix Composite Laminates

SIGNIFICANCE AND USE
5.1 This test practice is designed to produce tensile property data for material specifications, research and development, quality assurance, and structural design and analysis. Factors that influence the tensile response and should therefore be reported include the following: materials (laminates and adhesive), methods of material preparation including surface preparation prior to bonding, lay-ups, specimen stacking sequence, joint taper ratio or step length, ply overlap length, material relative thicknesses and stiffness of the parent and repair laminates, adhesive bond stiffness, specimen preparation, specimen conditioning, environment of testing, specimen alignment and gripping, speed of testing, time at temperature, void content, and volume percent reinforcement. Properties in the test direction, which may be obtained from this test practice, include the following:  
5.1.1 Ultimate tensile strength (based on the nominal parent material thickness), (Fptu).  
5.1.2 Ultimate tensile strength (based on the nominal repair material thickness), (Frtu).  
5.1.3 Ultimate running force per repair ply, (Nj).
SCOPE
1.1 This test practice defines the procedure for determination of the tensile strength of a tapered or stepped joint of polymer matrix composite materials. It is applicable to secondary bonded or co-bonded laminates with either unidirectional plies or woven fabric reinforcements. The materials to be bonded may be different material systems. In the bondline, a separate adhesive material may or may not be used (example: adhesives may be used with a prepreg system or may not be used with a wet lay-up repair system). The range of acceptable test laminates and thicknesses is described in 8.2.1.  
1.2 This practice supplements Test Method D3039/D3039M for tensile loading. Several important test specimen parameters (for example, joint length, ply overlaps, step depth, and taper ratio) are not mandated by this practice, however, these parameters are required to be specified and reported to support repeatable results.  
1.3 Unidirectional (0° ply orientation) tape composites, textile composites, as well as multidirectional composite laminates, can be tested.  
1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard.  
1.4.1 Within the text the inch-pound units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the standard  
1.5 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.  
1.6 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-Jul-2017
Technical Committee
Current Stage
Ref Project

Relations

Buy Standard

Standard
ASTM D8131/D8131M-17 - Standard Practice for Tensile Properties of Tapered and Stepped Joints of Polymer Matrix Composite Laminates
English language
9 pages
sale 15% off
Preview
sale 15% off
Preview

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: D8131/D8131M − 17
Standard Practice for
Tensile Properties of Tapered and Stepped Joints of
1
Polymer Matrix Composite Laminates
This standard is issued under the fixed designation D8131/D8131M; 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 Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
1.1 This test practice defines the procedure for determina-
Barriers to Trade (TBT) Committee.
tion of the tensile strength of a tapered or stepped joint of
polymer matrix composite materials. It is applicable to second-
2. Referenced Documents
ary bonded or co-bonded laminates with either unidirectional
2
2.1 ASTM Standards:
plies or woven fabric reinforcements. The materials to be
D792 Test Methods for Density and Specific Gravity (Rela-
bonded may be different material systems. In the bondline, a
tive Density) of Plastics by Displacement
separate adhesive material may or may not be used (example:
D883 Terminology Relating to Plastics
adhesives may be used with a prepreg system or may not be
D3039/D3039M Test Method for Tensile Properties of Poly-
used with a wet lay-up repair system). The range of acceptable
mer Matrix Composite Materials
test laminates and thicknesses is described in 8.2.1.
D3171 Test Methods for Constituent Content of Composite
1.2 This practice supplementsTest Method D3039/D3039M
Materials
for tensile loading. Several important test specimen parameters
D3878 Terminology for Composite Materials
(for example, joint length, ply overlaps, step depth, and taper
D5229/D5229M Test Method for MoistureAbsorption Prop-
ratio) are not mandated by this practice, however, these
erties and Equilibrium Conditioning of Polymer Matrix
parameters are required to be specified and reported to support
Composite Materials
repeatable results.
E4 Practices for Force Verification of Testing Machines
1.3 Unidirectional (0° ply orientation) tape composites,
E6 Terminology Relating to Methods of Mechanical Testing
textile composites, as well as multidirectional composite
E122 Practice for Calculating Sample Size to Estimate,With
laminates, can be tested.
Specified Precision, the Average for a Characteristic of a
Lot or Process
1.4 The values stated in either SI units or inch-pound units
E177 Practice for Use of the Terms Precision and Bias in
are to be regarded separately as standard.
ASTM Test Methods
1.4.1 Within the text the inch-pound units are shown in
E456 Terminology Relating to Quality and Statistics
brackets. The values stated in each system are not exact
E2533 Guide for Nondestructive Testing of Polymer Matrix
equivalents; therefore, each system must be used indepen-
Composites Used in Aerospace Applications
dently of the other. Combining values from the two systems
3
2.2 Other Documents:
may result in nonconformance with the standard
CMH-17 Composite Materials Handbook-17 – Volume I
1.5 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
3. Terminology
responsibility of the user of this standard to establish appro-
3.1 Terminology D3878 defines terms relating to high-
priate safety, health and environmental practices and deter-
modulus fibers and their composites. Terminology D883 de-
mine the applicability of regulatory limitations prior to use.
fines terms relating to plastics. Terminology E6 defines terms
1.6 This international standard was developed in accor-
relating to mechanical testing. Terminology E456 and Practice
dance with internationally recognized principles on standard-
E177 define terms relating to statistics. In the event of a
ization established in the Decision on Principles for the
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
1
This practice is under the jurisdiction ofASTM Committee D30 on Composite contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Materials and is the direct responsibility of Subcommittee D30.05 on StructuralTest Standards volume information, refer to the standard’s Document Summary page on
Methods. the ASTM website.
3
Current edition approved Aug. 1, 2017. Published August 2017. Originally Available for purchase in print and e-book format from SAE International,
approved in 2017. DOI: 10.1520/D8131_D8131M-17. http://books.sae.org/r-422/.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D8131/D8131M − 17
conflict between terms, Terminology D3878 shall h
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.