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ASTM D3846-08

(Test Method)

Standard Test Method for In-Plane Shear Strength of Reinforced Plastics

Standard Test Method for In-Plane Shear Strength of Reinforced Plastics

SIGNIFICANCE AND USE
Shear tests of various kinds are widely used in the reinforced plastics industry to assess the strength of the reinforcement-to-resin bond in polyester-, vinyl ester-, and epoxy-resin composites. In addition to their importance for the generation of data for research and development, quality control, and specification purposes, such tests are of fundamental value to the fibrous reinforcement industry, since they can be used to assess the potential of new sizing systems for the surface treatment of glass fibers.
This test method is useful for establishing the shear strength of laminates or other reinforced plastics having randomly dispersed fiber reinforcement. While the test also lends itself to parallel-fiber reinforced plastics, it has been designed to accommodate nonparallel-fiber reinforced materials that cannot be tested satisfactorily by the short-beam procedure described in Test Method D 2344.
SCOPE
1.1 This test method covers the determination of the in-plane shear strength of reinforced thermosetting plastics in flat sheet form in thicknesses ranging from 2.54 to 6.60 mm (0.100 to 0.260 in.). This protocol in not for reinforced pultruded thermoset products, which may use Test Method D 2344/D 2344M.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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.
Note 1—This standard has no known ISO equivalent.

General Information

Status
Historical
Publication Date
30-Apr-2008
ICS
83.120 - Reinforced plastics
Technical Committee
D20 - Plastics
Drafting Committee
D20.18 - Reinforced Thermosetting Plastics
Current Stage
Ref Project

Relations

Replaces
ASTM D3846-02 - Standard Test Method for In-Plane Shear Strength of Reinforced Plastics
Effective Date
01-May-2008
Replaced By
ASTM D3846-08(2015) - Standard Test Method for In-Plane Shear Strength of Reinforced Plastics
Effective Date
01-Sep-2015
Referred By
ASTM E2478-11(2022) - Standard Practice for Determining Damage-Based Design Stress for Glass Fiber Reinforced Plastic (GFRP) Materials Using Acoustic Emission
Effective Date
01-May-2008
Referred By
ASTM D6856/D6856M-03(2016) - Standard Guide for Testing Fabric-Reinforced “Textile” Composite Materials
Effective Date
01-May-2008
Referred By
ASTM D7745-19 - Standard Practice for Testing Pultruded Composites
Effective Date
01-May-2008
Referred By
ASTM C1292-22 - Standard Test Method for Shear Strength of Continuous Fiber-Reinforced Advanced Ceramics at Ambient Temperatures
Effective Date
01-May-2008
Referred By
ASTM F2902-16e1 - Standard Guide for Assessment of Absorbable Polymeric Implants
Effective Date
01-May-2008
Referred By
ASTM F1092-19 - Standard Specification for Fiberglass (GRP) Pultruded Open-Weather Storm and Guard, Square Railing Systems
Effective Date
01-May-2008
Referred By
ASTM C1425-19 - Standard Test Method for Interlaminar Shear Strength of 1D and 2D Continuous Fiber-Reinforced Advanced Ceramics at Elevated Temperatures
Effective Date
01-May-2008
Referred By
ASTM D4762-18 - Standard Guide for Testing Polymer Matrix Composite Materials
Effective Date
01-May-2008

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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: D3846 − 08
StandardTest Method for
1
In-Plane Shear Strength of Reinforced Plastics
This standard is issued under the fixed designation D3846; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber 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 U.S. Department of Defense.
1. Scope axis of the specimen between two centrally located notches
machined halfway through its thickness on opposing faces.
1.1 This test method covers the determination of the in-
plane shear strength of reinforced thermosetting plastics in flat
4. Summary of Test Method
sheetforminthicknessesrangingfrom2.54to6.60mm(0.100
4.1 In-plane shear strength, as determined by this test
to 0.260 in.). This protocol in not for reinforced pultruded
method, is measured by applying a compressive load to a
thermoset products, which may use Test Method D2344/
notched specimen of uniform width. The specimen is loaded
D2344M.
edgewise in a supporting jig of the same description as that
1.2 The values stated in SI units are to be regarded as the
referenced in Test Method D695 for testing thin specimens.A
standard. The values given in parentheses are for information
schematic of the specimen used for this test and the supporting
only.
jig is shown in Fig. 1. Failure of the specimen occurs in shear
1.3 This standard does not purport to address all of the
between two centrally located notches machined halfway
safety concerns, if any, associated with its use. It is the
through its thickness and spaced a fixed distance apart on
responsibility of the user of this standard to establish appro-
opposing faces.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
5. Significance and Use
NOTE 1—This standard has no known ISO equivalent.
5.1 Shear tests of various kinds are widely used in the
reinforced plastics industry to assess the strength of the
2. Referenced Documents
reinforcement-to-resin bond in polyester-, vinyl ester-, and
2
2.1 ASTM Standards: epoxy-resin composites. In addition to their importance for the
D618Practice for Conditioning Plastics for Testing
generation of data for research and development, quality
D695Test Method for Compressive Properties of Rigid
control,andspecificationpurposes,suchtestsareoffundamen-
Plastics
tal value to the fibrous reinforcement industry, since they can
D2344/D2344MTest Method for Short-Beam Strength of
be used to assess the potential of new sizing systems for the
PolymerMatrixCompositeMaterialsandTheirLaminates surface treatment of glass fibers.
E4Practices for Force Verification of Testing Machines
5.2 This test method is useful for establishing the shear
E691Practice for Conducting an Interlaboratory Study to
strength of laminates or other reinforced plastics having
Determine the Precision of a Test Method
randomly dispersed fiber reinforcement. While the test also
lends itself to parallel-fiber reinforced plastics, it has been
3. Terminology
designed to accommodate nonparallel-fiber reinforced materi-
3.1 Definitions:
als that cannot be tested satisfactorily by the short-beam
3.1.1 in-plane shear strength—the shear strength at rupture
procedure described in Test Method D2344/D2344M.
in which the plane of fracture is located along the longitudinal
6. Apparatus
1
This test method is under the jurisdiction ofASTM Committee D20 on Plastics
6.1 Testing Machine—Any suitable testing machine capable
and is the direct responsibility of Subcommittee D20.18 on Reinforced Thermoset-
of control of constant-rate-of-crosshead movement and com-
ting Plastics.
prising essentially the following:
Current edition approved May 1, 2008. Published June 2008. Originally
6.1.1 Drive Mechanism—A drive mechanism for imparting
approved in 1979. Last previous edition approved in 2002 as D3846-02. DOI:
10.1520/D3846-08.
to the movable member a uniform, controlled velocity with
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
respect to the stationary member, as required in 10.3.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
6.1.2 Load Indicator—A load-indicating mechanism ca-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. pable of showing the total compressive load carried by the test
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D3846 − 08
suspected or known to be anisotropic, ten specimens (five
normal to and five parallel with the principal axis
...

This document is not anASTM standard and is intended only to provide the user of anASTM 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:D3846 –02 Designation:D3846 –08
Standard Test Method for
1
In-Plane Shear Strength of Reinforced Plastics
This standard is issued under the fixed designation D3846; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber 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. Scope *
1.1Thistestmethodcoversthedeterminationofthein-planeshearstrengthofreinforcedthermosettingplasticsinflatsheetform
in thicknesses ranging from 2.54 to 6.60 mm (0.100 to 0.260 in.).
1.1 This test method covers the determination of the in-plane shear strength of reinforced thermosetting plastics in flat sheet
form in thicknesses ranging from 2.54 to 6.60 mm (0.100 to 0.260 in.). This protocol in not for reinforced pultruded thermoset
products, which may use Test Method D2344/D2344M.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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.
NOTE 1—This standard has no known ISO equivalent.
2. Referenced Documents
2
2.1 ASTM Standards:
D618 Practice for Conditioning Plastics for Testing
D695 Test Method for Compressive Properties of Rigid Plastics
D23442344/D2344M Test Method for Short-Beam Strength of Polymer Matrix Composite Materials and Their Laminates
E4 Practices for Force Verification of Testing Machines
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
3. Terminology
3.1 Definitions:
3.1.1 in-plane shear strength—the shear strength at rupture in which the plane of fracture is located along the longitudinal axis
of the specimen between two centrally located notches machined halfway through its thickness on opposing faces.
4. Summary of Test Method
4.1 In-plane shear strength, as determined by this test method, is measured by applying a compressive load to a notched
specimen of uniform width.The specimen is loaded edgewise in a supporting jig of the same description as that referenced inTest
Method D695 for testing thin specimens. A schematic of the specimen used for this test and the supporting jig is shown in Fig.
1. Failure of the specimen occurs in shear between two centrally located notches machined halfway through its thickness and
spaced a fixed distance apart on opposing faces.
5. Significance and Use
5.1 Shear tests of various kinds are widely used in the reinforced plastics industry to assess the strength of the
reinforcement-to-resin bond in polyester-, vinyl ester-, and epoxy-resin composites. In addition to their importance for the
generation of data for research and development, quality control, and specification purposes, such tests are of fundamental value
to the fibrous reinforcement industry, since they can be used to assess the potential of new sizing systems for the surface treatment
of glass fibers.
1
This test method is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.18 on Reinforced Thermosetting
Plastics.
Current edition approved March 10, 2002. Published May 2002. Originally published as D3846–79. Last previous edition D3846–94.
Current edition approved May 1, 2008. Published June 2008. Originally approved in 1979. Last previous edition approved in 2002 as D3846-02.
2
ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,orcontactASTMCustomerServiceatservice@astm.org.For Annual Book of ASTM Standards
, Vol 08.01.volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
D3846 –08
FIG. 1 Specimen and Loading Jig for In-Plane Shear Test
5.2 This test method is useful for establishing the shear strength of laminates or other reinforced plastics having randomly
dispersed fiber reinforcement. While the test also lends itself to parallel-fiber reinforced plastics, it has been des
...

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1.2 Supplementary information on chemical resistance, resistance to heat, and installation practices are provided in Appendix X1.  
1.3 The classification of these plastic panels into types based on relative response to a laboratory test shall not be considered a fire hazard classification.  
1.4 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.  
1.5 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in Tables and Figures) shall not be considered as requirements of this standard.  
1.6 Fire properties are determined by using laboratory flammability tests (Test Methods D635, D1929, and E84).  
1.6.1 This standard is used to measure and describe the response of materials, products, or assemblies to heat and flame under controlled conditions, but does not by itself incorporate all factors required for fire hazard or fire risk assessment of the materials, products or assemblies under actual fire conditions.  
1.6.2 Fire testing is inherently hazardous. Adequate safeguards for personnel and property shall be employed in conducting these tests.  
1.7 The following precautionary caveat pertains only to the test method portion, Section 8 of this specification. This specification 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 specification to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.  
Note 1: There is no known ISO equivalent to this standard.  
1.8 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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ASTM
ASTM D3982-21(Specification)
Standard Specification for Contact Molded “Fiberglass” (Glass Fiber Reinforced Thermosetting Resin) Ducts

ABSTRACT
This specification covers the material and design requirements, and fabrication of ducts and hoods made of "fiberglass" (glass fiber reinforced thermosetting resin) consisting of a polyester, vinyl ester, or other qualified resin-matrix systems with fiber reinforcement manufactured by contact molding, intended for use in handling corrosive fumes and process gases. Special attention is given to equipment that operates at specified temperatures with regard to strength and corrosion resistance. This specification does not address the selection of resins and reinforcements for specific chemical environments.
SCOPE
1.1 This specification covers ducts fabricated by contact molding intended for use in handling corrosive fumes and process gases. Special attention is given to equipment that operates at temperatures over 180°F (82.2°C) with regard to strength and corrosion resistance.  
1.2 The material of construction shall be “fiberglass” consisting of a polyester, vinyl ester, or other qualified resin-matrix systems with fiber reinforcement in accordance with Specification C582.  
1.3 This specification is not intended to cover selection of resins and reinforcements for specific chemical environments.  
1.4 This specification covers ducts up to a design pressure of ±5 psig (34.5 Pa).  
1.5 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.  
1.6 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.
Note 1: There is no known ISO equivalent to this standard.  
1.7 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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ASTM
ASTM C581-20(Practice)
Standard Practice for Determining Chemical Resistance of Thermosetting Resins Used in Glass-Fiber-Reinforced Structures Intended for Liquid Service

SIGNIFICANCE AND USE
4.1 The results obtained by this practice shall serve as a guide in, but not as the sole basis for, selection of a thermosetting resin used in an RTP structure. No attempt has been made to incorporate into the practice all the various factors that will potentially affect the serviceability of an RTP structure when subjected to chemical environments. These factors will potentially include stress, different resin-to-glass ratios, and multiple veils.
SCOPE
1.1 This practice is designed to evaluate, in an unstressed state, the chemical resistance of thermosetting resins used in the fabrication of reinforced thermosetting plastic (RTP) laminates. This practice provides for the determination of changes in the properties, described as follows, of the test specimens and test reagent after exposure of the specimens to the reagent: hardness of specimens, weight change thickness, appearance of specimens, appearance of immersion media, and flexural strength and modulus.  
1.1.1 This practice is also useful to evaluate other factors, such as surfacing veils and the effect of resin additives, on the chemical resistance of the resin.  
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
Note 1: There is no known ISO equivalent to this standard.  
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.

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