ASTM D3914-02

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Designation: D 3914 – 02
Standard Test Method for
In-Plane Shear Strength of Pultruded Glass-Reinforced
1
Plastic Rod
This standard is issued under the fixed designation D 3914; 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.
1. Scope compression tool, such as those shown in Fig. 1 and Fig. 2 of
Test Method D 695. Failure of the specimen occurs in shear
1.1 This test method covers the determination of the in-
between two centrally located notches, diametrically opposed
plane shear strength of pultruded, glass-fiber reinforced, ther-
and machined halfway through its diameter at a fixed distance
mosetting plastic rod of diameters ranging from 19 to 32 mm
3 1 apart. The notches are accurately machined in the specimen
( ⁄4 to 1 ⁄4in.).
with maximum reproducibility by means of a special notching
1.2 The values stated in SI units are to be regarded as the
jig (Fig. 2a and Fig. 2b) designed specifically for this purpose.
standard.
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. Specific precau-
epoxy-resin composites. In addition to their importance for the
tionary statements are given in Note 2 and Note 3.
generation of data for research and development, quality
NOTE 1—There is no similar or equivalent ISO standard.
control,andspecificationpurposes,suchtestsareoffundamen-
tal value to the fibrous reinforcement industry, since they can
2. Referenced Documents
beusedtodeterminethepotentialofnewsizingsystemsforthe
2.1 ASTM Standards:
surface treatment of glass fibers.
2
D 618 Practice for Conditioning Plastics for Testing
5.2 The in-plane shear strength of pultruded cylindrical
D 695 Test Method for Compressive Properties of Rigid
composites is an important property from an engineering
2
Plastics
standpoint, since pultruded rod, as such, is used in many
3
E 4 Practices for Force Verification of Testing Machines
structural applications.
3. Terminology
6. Apparatus
3.1 Definition:
6.1 Testing Machine—Any suitable testing machine capable
3.1.1 in-plane shear strength—the shear strength at maxi-
of control of constant-rate-of-crosshead movement and com-
mum load in which the plane of fracture is centrally located
prising essentially the following:
along the longitudinal axis of the specimen between two
6.1.1 Drive Mechanism—A drive mechanism for imparting
diametrically opposed notches machined halfway through its
to the movable member a uniform, controlled velocity with
diameter.
respect to the stationary member, as required in 10.3.
6.1.2 Load Indicator—A load-indicating mechanism ca-
4. Summary of Test Method
pable of showing the total compressive load carried by the test
4.1 In-plane shear strength, as determined by this test
specimen. The mechanism shall be essentially free of inertial
method, is measured by applying a compressive load to
lag at the specified rate of testing and shall indicate the load
notched cylindrical specimens of the type shown in Fig. 1.
with an accuracy of 61 % of the maximum indicated value of
Loading of the specimen is accomplished with a subpress, or
the test (load). The accuracy of the testing machine shall be
verified at least once a year in accordance with Practices E 4.
1 6.1.3 Notching Jig—A notching jig of the type shown in
This test method is under the jurisdiction ofASTM Committee D20 on Plastics
Fig. 2a and Fig. 2b, or the equivalent, for notching the test
and is the direct responsibility of Subcommittee D20.18 on Reinforced Thermoset-
ting Plastics.
specimens.
Current edition approved March 10, 2002. Published May 2002. Originally
6.1.4 Compression Tool—A compression tool for applying
published as D 3914 – 80. Last previous edition D 3914 – 96.
2 the load to the test specimen, such as those shown in Fig. 1 and
Annual Book of ASTM Standards, Vol 08.01.
3
Annual Book of ASTM Standards, Vols 03.01 and 04.02. Fig. 2 of Test Method D 695.
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D 3914
FIG. 1 Notched Rod In-Plane Shear Specimen; Dimensions: Top, mm; Bottom, in.
6.1.5 Micrometers—Suitable micrometers, reading to 0.025 the
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