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GB/T 1458-2008 (GBT1458-2008)

GB/T 1458-2008_English: PDF (GBT 1458-2008, GBT1458-2008)
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BASIC DATA
Standard ID GB/T 1458-2008 (GB/T1458-2008)
Description (Translated English) Test method for mechanical properties of ring of filament-winding reinforced plastics
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard Q23
Classification of International Standard 83.120
Word Count Estimation 14,196
Date of Issue 2008-06-30
Date of Implementation 2009-04-01
Older Standard (superseded by this standard) GB/T 1458-1988; GB/T 1461-1988; GB/T 2578-1989
Quoted Standard GB/T 1446; GB/T 2577; GB/T 3855
Adopted Standard ASTM D2291-1998, NEQ; ASTM D2290-2000, NEQ; ASTM D2344/D2344M-2000, NEQ
Drafting Organization Harbin FRP Research Institute
Administrative Organization Plastic fiber reinforced Standardization Technical Committee of the National
Regulation (derived from) National Standard Approval Announcement 2008 No.11 (Total No.124)
Proposing organization China Building Materials Federation
Issuing agency(ies) Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China
Summary This standard specifies the sample preparation filament wound reinforced plastic ring specimens for mechanical testing, shear test, tensile tests and test reports. This standard applies to the production of fiber reinforced plastic ring wrapped sample and measuring the filament-wound reinforced plastic ring specimens interlaminar shear strength, tensile strength, tensile modulus and tensile strength of the fibers.

Standards related to: GB/T 1458-2008

GB/T 1458-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.120
Q 23
Replacing GB/T 1458-1988, GB/T 1461-1988, GB/T 2578-1989
Test method for mechanical properties of ring of
filament-winding reinforced plastics
ISSUED ON: JUNE 30, 2008
IMPLEMENTED ON: APRIL 01, 2009
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Method overview ... 5 
4 Specimen preparation ... 7 
5 Shear test ... 10 
6 Tensile test ... 13 
7 Test report ... 17 
Appendix A (Normative) Determination of elastic modulus ... 18 
Test method for mechanical properties of ring of
filament-winding reinforced plastics
1 Scope
This standard specifies the specimen preparation, shear test, tensile test, test
report for the mechanical performance test of ring of filament-winding reinforced
plastics.
This standard applies to the production of ring of filament-winding reinforced
plastics, as well as the determination of the interlaminar shear strength, tensile
strength, tensile elastic modulus, fiber tensile strength of ring of filament-
winding reinforced plastics.
2 Normative references
The provisions in following documents become the provisions of this Standard
through reference in this Standard. For the dated references, the subsequent
amendments (excluding corrections) or revisions do not apply to this Standard;
however, parties who reach an agreement based on this Standard are
encouraged to study if the latest versions of these documents are applicable.
For undated references, the latest edition of the referenced document applies.
GB/T 1446 The generals of test methods for properties of fiber-reinforced
plastics
GB/T 2577 Test method for resin content of glass fiber reinforced plastics
GB/T 3855 Test method for resin content of carbon fiber reinforced plastics
3 Method overview
3.1 Method of specimen preparation
3.1.1 Overview
The specimen is prepared by the single-ring winding method or the cylindrical
cutting ring method. These two methods can adopt wet winding or prepreg
winding. The two winding processes are as shown in Figure 1 and Figure 2,
respectively. When making performance comparisons, the specimens shall be
1 - Prepreg tape ball; 2 - Tension device; 3 - Yarn nozzle; 4 - Ring mold.
Figure 2 -- Schematic diagram of prepreg winding
3.2 Shear test method
Cut the ring specimen into the specified size; apply the load with the three-point
bending loading method as shown in the Figure 3; record the failure load;
calculate the shear strength of the specimen.
3.3 Tensile test method
Mount the ring specimen on the tension plate of the testing machine; load and
stretch at the specified loading speed until the specimen fails; record the failure
load; calculate the strength and modulus.
4 Specimen preparation
4.1 Equipment
4.1.1 Winding machine
The winding machine is composed of a creel, a glue tank, a tension control
device, a yarn nozzle, a driving mechanism, etc.
4.1.2 Mold and core mold
The single-ring mold is as shown in the Figure 3. The two ends of the core mold
of the cylindrical ring cutting method shall be left with appropriate shafts to
facilitate the assembly of the mold on the winding machine.
4.1.3 Demolding
A suitable press can be used for the demolding machine.
4.1.4 Curing
The curing device shall have an appropriate controllable temperature range,
which has a temperature control accuracy of ±2 °C.
from the yarn ball, the twist of yarn shall be kept constant; a slight tension shall
be applied to prevent it from shaking.
4.3.3 Impregnation
The fiber is drawn from the yarn ball, passes through the guide roller, enters the
glue tank with heating device. When the fiber is pulled out from the glue tank,
use a squeezing roller or a squeegee to remove the excess glue while
minimizing fiber wear.
4.3.4 Tension control
The impregnated fiber is passed through a series of guide rollers; apply the
required tension to the fiber. The winding tension is: 5% ~ 8% of the breaking
strength of the fiber for glass fiber; 3% ~ 4% of the breaking strength of the fiber
for aramid; according to the process requirements of carbon fiber, it should not
damage the fiber.
4.3.5 Yarn arrangement
The fiber arrangement shall be uniform; neither accumulation nor separation
from the seam is allowed. Make the fiber impregnation uniform; the tension is
stable; the winding speed should be not more than 60 r/min (the line speed is
28 m/min).
4.3.6 Curing
After winding the ring specimen, it is cured according to the specified curing
system. The storage time of the ring specimens wound in the same batch before
curing shall not exceed 8h.
4.3.7 Processing and demolding
After curing the single-ring specimen, first remove the outer molds on both sides
and string together for surface processing by grinding or fine turning. After
processing, use a press to remove the middle mold.
After curing, the cylinder is ground or precision turned for surface processing,
then the ring is cut and demolded.
4.4 Prepreg winding process
The procedure for preparing specimens by the prepreg method is basically the
same as the wet winding process, but the preheating temperature of the mold
and the baking conditions, winding tension, winding speed of the prepreg tape
must be determined according to the technical conditions specified for the
prepreg tape.
The test results are in accordance with the provisions of GB/T 1446.
7 Test report
The content of the test report shall include all or part of the following items:
a) The name of the test item and the number of this standard;
b) Varieties and specifications of raw materials;
c) Ambient temperature and relative humidity when preparing the ring
specimen;
d) Winding tension and speed;
e) Mold material;
f) Curing system;
g) Specimen preparer and date;
h) The type, number, shape, size, appearance quality and quantity of the
specimen;
i) Test temperature, relative humidity, specimen state conditioning;
j) Model, measurement range and using conditions of test equipment and
instruments;
k) Test results:
Giving the single value of the shear performance of each specimen (if
necessary, giving the damage of each specimen), arithmetic mean,
standard deviation, dispersion coefficient;
l) Test personnel, date, and others.
Where:
E - Modulus of elasticity, in megapascals (MPa);
Δp - The load increment of the initial straight line segment on the load-strain
curve, in Newton (N);
b - The width of the specimen, in millimeters (mm);
h - The thickness of the specimen, in millimeters (mm);
Δε1, Δε2 - Strain increments at both sides corresponding to the load
increments Δp.
A.1.6 The number of specimens is in accordance with the provisions of GB/T
1446.
A.1.7 The test results are in accordance with the provisions of GB/T 1446.
A.2 Deformation gauge method
A.2.1 Install deformation gauges symmetrically on both sides of the gap in the
tension plate (see Figure A.1).
A.2.2 Operate according to A.1.2, A.1.3, A.1.4.
A.2.3 The elastic modulus is calculated according to formula (A.2):
Where:
E - Modulus of elasticity, in megapascals (MPa);
Δp - The load increment of the initial straight line segment on the load-strain
curve, in Newton (N);
b - The width of the specimen, in millimeters (mm);
h - The thickness of the specimen, in millimeters (mm);
D - The diameter of the specimen, in millimeters (mm);
Δl1, Δl2 - The deformation increments on both sides corresponding to the
load increment Δp, in millimeters (mm).
...