ASTM D3846-94

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

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.).
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: 09-Mar-2002
• ICS: 83.120 - Reinforced plastics
• Technical Committee: D20 - Plastics
• Drafting Committee: D20.18 - Reinforced Thermosetting Plastics

Relations

• Replaced By: ASTM D3846-02 - Standard Test Method for In-Plane Shear Strength of Reinforced Plastics
• Effective Date: 10-Mar-2002
• Referred By: ASTM F1092-19 - Standard Specification for Fiberglass (GRP) Pultruded Open-Weather Storm and Guard, Square Railing Systems
• Effective Date: 10-Mar-2002
• 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: 10-Mar-2002
• Referred By: ASTM C1292-22 - Standard Test Method for Shear Strength of Continuous Fiber-Reinforced Advanced Ceramics at Ambient Temperatures
• Effective Date: 10-Mar-2002
• Referred By: ASTM D4762-18 - Standard Guide for Testing Polymer Matrix Composite Materials
• Effective Date: 10-Mar-2002
• Referred By: ASTM D7745-19 - Standard Practice for Testing Pultruded Composites
• Effective Date: 10-Mar-2002
• Referred By: ASTM F2902-16e1 - Standard Guide for Assessment of Absorbable Polymeric Implants
• Effective Date: 10-Mar-2002
• Referred By: ASTM D6856/D6856M-03(2016) - Standard Guide for Testing Fabric-Reinforced “Textile” Composite Materials
• Effective Date: 10-Mar-2002
• 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: 10-Mar-2002

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: D 3846 – 94
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Method for
In-Plane Shear Strength of Reinforced Plastics
This standard is issued under the fixed designation D 3846; 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 (e) 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 notched specimen of uniform width. The specimen is loaded
edgewise in a supporting jig of the same description as that
1.1 This test method covers the determination of the in-
referenced in Test Method D 695 for testing thin specimens. A
plane shear strength of reinforced thermosetting plastics in flat
schematic of the specimen used for this test and the supporting
sheet form in thicknesses ranging from 2.54 to 6.60 mm (0.100
jig is shown in Fig. 1. Failure of the specimen occurs in shear
to 0.260 in.).
between two centrally located notches machined halfway
1.2 The values stated in SI units are to be regarded as the
through its thickness and spaced a fixed distance apart on
standard. The values given in parentheses are for information
opposing faces.
only.
1.3 This standard does not purport to address all of the
5. Significance and Use
safety concerns, if any, associated with its use. It is the
5.1 Shear tests of various kinds are widely used in the
responsibility of the user of this standard to establish appro-
reinforced plastics industry to assess the strength of the
priate safety and health practices and determine the applica-
reinforcement-to-resin bond in polyester-, vinyl ester-, and
bility of regulatory limitations prior to use.
epoxy-resin composites. In addition to their importance for the
NOTE 1—This standard has no known ISO equivalent.
generation of data for research and development, quality
control, and specification purposes, such tests are of fundamen-
2. Referenced Documents
tal value to the fiberous reinforcement industry, since they can
2.1 ASTM Standards:
be used to assess the potential of new sizing systems for the
D 618 Practice for Conditioning Plastics and Electrical
surface treatment of glass fibers.
Insulating Materials for Testing
5.2 This test method is useful for establishing the shear
D 695 Test Method for Compressive Properties of Rigid
strength of laminates or other reinforced plastics having
Plastics
randomly dispersed fiber reinforcement. While the test also
D 2344 Test Method for Apparent Interlaminar Shear
lends itself to parallel-fiber reinforced plastics, it has been
Strength of Parallel Fiber Composites by Short Beam
designed to accommodate nonparallel-fiber reinforced materi-
Method
als that cannot be tested satisfactorily by the short-beam
E 4 Practices for Load Verification of Testing Machines
procedure described in Test Method D 2344.
3. Terminology
6. Apparatus
3.1 Definitions:
6.1 Testing Machine—Any suitable testing machine capable
3.1.1 in-plane shear strength—the shear strength at rupture
of control of constant-rate-of-crosshead movement and com-
in which the plane of fracture is located along the longitudinal
prising essentially the following:
axis of the specimen between two centrally located notches
6.1.1 Drive Mechanism—A drive mechanism for imparting
machined halfway through its thickness on opposing faces.
to the movable member a uniform, controlled velocity with
respect to the stationary member, as required in 10.3.
4. Summary of Test Method
6.1.2 Load Indicator—A load-indicating mechanism ca-
4.1 In-plane shear strength, as determined by this test
pable of showing the total compressive load carried by the test
method, is measured by applying a compressive load to a
specimen. The mechanism shall be essentially free of inertial
lag at the specified rate of testing and shall indicate the load
This test method is under the jurisdiction of ASTM Committee D-20 on Plastics
with an accuracy of 61 % of the maximum indicated value of
and is the direct responsibility of Subcommittee D20.18 on Reinforced Thermoset-
the test (load). The accuracy of the testing machine shall be
ting Plastics.
verified at least once a year in accordance with Practices E 4.
Current edition approved June 15, 1994. Published August 1994. Originally
6.1.3 Compression Tool—A compression tool for applying
published as D 3846 – 79. Last previous edition D 3846 – 93.
Annual Book of ASTM Standards, Vol 08.01.
the load to the test specimen, such as those shown in Figs. 1
Annual Book of ASTM Standards, Vol 15.03.
and 2 of Test Method D 695.
Annual Book of ASTM Standards, Vol 03.01.
D 3846
In case of disagreement, the tolerances shall be6 1°C (61.8°F)
and 62 % relative humidity.
8.2 Test Conditions—Conduct tests in the standard labora-
tory atmosphere of 23 6 2°C (73.4 6 3.6°F) and 50 6 5%
relative humidity, unless otherwise specified. In cases of
disagreement, the tolerances shall be 61°C (61.8°F) and
62 % relative humidity.
9. Speed of Testing
9.1 Speed of testing shall be the relative rate of motion of
the grips or test fixtures during the test. Rate of motion of the
driven grip or fixture when the machine is running idle may be
used if it can be shown
...