ASTM D7616/D7616M-11(2017)
(Test Method)Standard Test Method for Determining Apparent Overlap Splice Shear Strength Properties of Wet Lay-Up Fiber-Reinforced Polymer Matrix Composites Used for Strengthening Civil Structures
Standard Test Method for Determining Apparent Overlap Splice Shear Strength Properties of Wet Lay-Up Fiber-Reinforced Polymer Matrix Composites Used for Strengthening Civil Structures
SIGNIFICANCE AND USE
5.1 Overlap splices are used in field applications of FRP composites when site conditions prohibit continuous access to a structural element or when the specified length of the FRP composite is such that saturation and placement of the entire length would be cumbersome. This method can be used as a quality control mechanism for ensuring that overlap splices constructed under field conditions meet or exceed the requirements established by the design engineer or FRP system manufacturer. Both the saturant mixing and fiber saturation method can be verified for wet-layup FRP systems.
5.2 Caution is recommended when interpreting apparent shear strength results obtained from this method. Single shear lap splices develop non-uniform shear stress distributions within the overlap splice region during testing. Additional guidance on the interpretation and use of results obtained from lap shear testing is found in D4896.
5.3 This test method focuses on the FRP material itself, irrespective of gripping method. Therefore, strengths resulting from failure or pullout at either grip are disregarded. The strength measurements are based solely on test specimens that fail in the gage section (away from the grips) or at the splice.
SCOPE
1.1 This test method describes the requirements for sample preparation and tensile testing of single-lap shear splices formed with fiber-reinforced polymer (FRP) composite materials commonly used for strengthening of structures made of materials such as metals, timber, masonry, and reinforced concrete. The objective of this method is to determine the apparent shear strength of an overlap splice joint through the application of a far-field tensile force. The method applies to wet lay-up FRP material systems fabricated on site or in a laboratory setting. The FRP composite may be of either unidirectional (0°) or cross-ply (0/90 type) reinforcement. For cross-ply laminates, the construction may be achieved using multiple-layers of unidirectional fibers at either 0 or 90°, or one or more layers of stitched or woven 0/90 fabrics. The composite material forms are limited to continuous fiber or discontinuous fiber-reinforced composites in which the laminate is balanced and symmetric with respect to the test direction. The method is often used to determine the length of the overlap splice needed to ensure that a tension failure occurs in the material away from the splice rather than the splice connection itself.
1.2 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, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
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 and health 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.
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Designation: D7616/D7616M − 11 (Reapproved 2017)
Standard Test Method for
Determining Apparent Overlap Splice Shear Strength
Properties of Wet Lay-Up Fiber-Reinforced Polymer Matrix
1
Composites Used for Strengthening Civil Structures
This standard is issued under the fixed designation D7616/D7616M; 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 responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
1.1 This test method describes the requirements for sample
bility of regulatory limitations prior to use.
preparation and tensile testing of single-lap shear splices
1.4 This international standard was developed in accor-
formed with fiber-reinforced polymer (FRP) composite mate-
dance with internationally recognized principles on standard-
rials commonly used for strengthening of structures made of
ization established in the Decision on Principles for the
materials such as metals, timber, masonry, and reinforced
Development of International Standards, Guides and Recom-
concrete. The objective of this method is to determine the
mendations issued by the World Trade Organization Technical
apparent shear strength of an overlap splice joint through the
Barriers to Trade (TBT) Committee.
application of a far-field tensile force. The method applies to
wet lay-up FRP material systems fabricated on site or in a
2. Referenced Documents
laboratory setting. The FRP composite may be of either
2
2.1 ASTM Standards:
unidirectional (0°) or cross-ply (0/90 type) reinforcement. For
D883 Terminology Relating to Plastics
cross-ply laminates, the construction may be achieved using
D3039/D3039M Test Method for Tensile Properties of Poly-
multiple-layers of unidirectional fibers at either 0 or 90°, or one
mer Matrix Composite Materials
or more layers of stitched or woven 0/90 fabrics. The compos-
D3878 Terminology for Composite Materials
ite material forms are limited to continuous fiber or discon-
D4896 Guide for Use of Adhesive-Bonded Single Lap-Joint
tinuous fiber-reinforced composites in which the laminate is
Specimen Test Results
balanced and symmetric with respect to the test direction. The
D5229/D5229M Test Method for Moisture Absorption Prop-
method is often used to determine the length of the overlap
erties and Equilibrium Conditioning of Polymer Matrix
splice needed to ensure that a tension failure occurs in the
Composite Materials
material away from the splice rather than the splice connection
D5687/D5687M Guide for Preparation of Flat Composite
itself.
Panels with Processing Guidelines for Specimen Prepara-
1.2 The values stated in either SI units or inch-pound units
tion
are to be regarded separately as standard. The values stated in
D7565/D7565M Test Method for Determining Tensile Prop-
each system may not be exact equivalents; therefore, each
erties of Fiber Reinforced Polymer Matrix Composites
system shall be used independently of the other. Combining
Used for Strengthening of Civil Structures
values from the two systems may result in non-conformance
E6 Terminology Relating to Methods of Mechanical Testing
with the standard.
E122 Practice for Calculating Sample Size to Estimate, With
1.2.1 Within the text, the inch-pound units are shown in
Specified Precision, the Average for a Characteristic of a
brackets.
Lot or Process
1.3 This standard does not purport to address all of the
E177 Practice for Use of the Terms Precision and Bias in
safety concerns, if any, associated with its use. It is the
ASTM Test Methods
E456 Terminology Relating to Quality and Statistics
1
This test method is under the jurisdiction of ASTM Committee D30 on
Composite Materials and is the direct responsibility of Subcommittee D30.10 on
2
Composites for Civil Structures. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Aug. 1, 2017. Published September 2017. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 2011. Last previous edition approved as D7616/D7616M–11. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D7616_D7616M-11R17. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D7616/D7616M − 11 (2017)
3
2.2 Other Standards: 3.3.7 L'—length of the overlap splice region
DOT/FAA/AR-01/33 Investigation of Thick Bondline Adhe-
3.3.8 n—number of specimens.
sive Joints, June 2001
3.3
...
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: D7616/D7616M − 11 D7616/D7616M − 11 (Reapproved 2017)
Standard Test Method for
Determining Apparent Overlap Splice Shear Strength
Properties of Wet Lay-Up Fiber-Reinforced Polymer Matrix
1
Composites Used for Strengthening Civil Structures
This standard is issued under the fixed designation D7616/D7616M; 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 describes the requirements for sample preparation and tensile testing of single-lap shear splices formed
with fiber-reinforced polymer (FRP) composite materials commonly used for strengthening of structures made of materials such
as metals, timber, masonry, and reinforced concrete. The objective of this method is to determine the apparent shear strength of
an overlap splice joint through the application of a far-field tensile force. The method applies to wet lay-up FRP material systems
fabricated on site or in a laboratory setting. The FRP composite may be of either unidirectional (0°) or cross-ply (0/90 type)
reinforcement. For cross-ply laminates, the construction may be achieved using multiple-layers of unidirectional fibers at either
0 or 90°, or one or more layers of stitched or woven 0/90 fabrics. The composite material forms are limited to continuous fiber
or discontinuous fiber-reinforced composites in which the laminate is balanced and symmetric with respect to the test direction.
The method is often used to determine the length of the overlap splice needed to ensure that a tension failure occurs in the material
away from the splice rather than the splice connection itself.
1.2 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, each system shall be used independently of the other. Combining values from the
two systems may result in non-conformance with the standard.
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 and health 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D883 Terminology Relating to Plastics
D3039/D3039M Test Method for Tensile Properties of Polymer Matrix Composite Materials
D3878 Terminology for Composite Materials
D4896 Guide for Use of Adhesive-Bonded Single Lap-Joint Specimen Test Results
D5229/D5229M Test Method for Moisture Absorption Properties and Equilibrium Conditioning of Polymer Matrix Composite
Materials
D5687/D5687M Guide for Preparation of Flat Composite Panels with Processing Guidelines for Specimen Preparation
D7565/D7565M Test Method for Determining Tensile Properties of Fiber Reinforced Polymer Matrix Composites Used for
Strengthening of Civil Structures
E6 Terminology Relating to Methods of Mechanical Testing
1
This test method is under the jurisdiction of ASTM Committee D30 on Composite Materials and is the direct responsibility of Subcommittee D30.10 on Composites
for Civil Structures.
Current edition approved March 1, 2011Aug. 1, 2017. Published May 2011September 2017. Originally approved in 2011. Last previous edition approved as
D7616/D7616M–11. DOI: 10.1520/D7616_D7616M-11.10.1520/D7616_D7616M-11R17.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. 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
---------------------- Page: 1 ----------------------
D7616/D7616M − 11 (2017)
E122 Practice for Calculating Sample Size to Estimate, With Specified Precision, the Average for a Characteristic of a Lot or
Pro
...
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