ASTM D2733-70(1976)

Method of Test for Interlaminar Shear Strength of Structural Reinforced Plastics at Elevated Temperatures (Withdrawn 1980)

General Information

• Status: Withdrawn
• Technical Committee: D20 - Plastics
• Drafting Committee: D20.18 - Reinforced Thermosetting Plastics

Standards Content (Sample)

AMERICAN NATIONAL
ANSI/ASTM D 2733- 70 (Reapproved 1976)
STANDARD
Standard Test Methods for
INTERLAMINAR SHEAR STRENGTH OF
STRUCTURAL REINFORCED PLASTICS AT
1
ELEVATED TEMPERATURES
This Standard is issued under the fixed designation D 2733: the number immediately following the designation indicates
the year of ongmal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the
year of last reapproval.
I. Scope
2.1.2 Method B does not require the use of
1.1 These methods cover the determination side-supporting steel plates; hence peel effects
are promoted. A shear-type failure with some
of interlaminar shear strength of structural
reinforced plastics at temperatures above the peeling at the interlaminar bond should result.
Standard Laboratory Temperature of 23 C
3. Significance
(73.4 F).
3.1 Inter laminar shear strength properties
NOTE 1-The values stated in SJ units are to be
regarded as the standard.
of reinforced plastic structures at elevated
NoTE 2-Safeguards against the effects or ex­
temperatures are of considerable importance
tremely high temperatures should be utilized to pro­
in predicting the strength of materials for
tect the operator.
characterization of materials for control and
1.2 These methods are not intended specifi­
specification purposes, and to provide useful
cally for use in determining the effect of long
data for research and development studies.
continued exposure at elevated temperatures
or of a cyclic exposure range of temperature·,
4. Definition
although they may be used for such special
4.1 inter/am inar shear strength-the shear
tests if desired.
strength at rupture in which the plane of frac­
ture is located between the layers of reinforce­
2. Summary of Methods
ment of a plastic reinforced structure. It is
2.1 These methods consist of preparing
expressed in pounds per square inch based on
specimens as described in 6.2 and inserting
the distance between saw cuts.
the specimens in the testing machine, with or
without attachments as required. The speci­
5. Apparatus
mens are then stressed until rupture occurs, in
5.1 Testing Machine-The tension testing
accordance with either of the methods out­
machine and its accessory equipment shall
lined below:
conform to the requirements specified in
2.1.1 Method A requires the use of side­
ASTM Method D 638, Test for Tensile Prop­
supporting steel plates, tightened evenly and
erties of Plastics.' All mechanical parts of the
firmly (to the extent necessary to prevent peel­
apparatus that are exposed to elevated tem­
ing of the specimen during the test, but not to
peratures during the test shall be adjusted to
the point where the specimen is crushed)
against the faces of the test specimen by
means of two small clamps, located 6.5 em
' These methods are under the jurisdiction of ASTM
1
Committee D-20 on Plastics and are the direct responsibility
(2 / in.) apart. With the steel plates in place,
2
of Subcommittee D-20.18 on Reinforced Thermosetting
of
the specimen shall be inserted in the grips
Plastics.
Current edition effective Dec. 24, 1970. Originally is­
the testing machine and stressed until rupture
sued 1968. Replaces D 2733 68 T.
2
occurs. A shear-type failure should result.
Annual Book of ASTM Standards, Part 35.
543

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02733
function normally at these temperatures, and support during the conditioning period.
their accuracy shall be verified by calibration 5.7 Side-Supporting Plates used for
tests at the specified test temperatures. Verifi­ Method A, 0.3 by 2.5 by 7.6 em Clx by l by 3
cation shall be repeated as often as necessary in.).
to ensure correct test readings. 5.8 C-Clamps, 2.5-cm (1-in.), for clamping
steel plates to test specimens.
5.2 Insulated Test Chamber, through which
air is circulated at the required temperature,
6. Test Specimens
to enclose the specimen during the actual test
(Note 3). This chamber shall also enclose at 6.1 Configuration ·Test specimens for both
least enough of the test machine components methods shall conform to the dimensions and
in Fig. I. They shall have a mini­
to ensure that conduction of heat through shape given
these components will not materially change mum thickness of 0.32 em ('!" in.) and shall be
the temperature of the specimen from that of 2.54 em (I in.) wide by 20 em (8 in.) long. The
length of the specimens may be varied to ac­
the test temperature. The temperature of the
air in the test chamber may be regulated by commodate requirements of the available test­
any convenient means. For high-temperature ing equipment. The edges of the specimen
testing of plastics that are readily attacked by shall be smooth but not round or beveled.
oxygen, the specimen may be enclosed in a 6.2 Preparation-- Two parallel cuts, one on
capsule so that it can be tested in an inert gas each opposite face of the specimen and
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