GB/T 1458-2023 PDF English
US$325.00 · In stock · Download in 9 secondsGB/T 1458-2023: Test method for mechanical properties of ring of filament-winding reinforced composites Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 1458: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 1458-2023 | English | 325 |
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Test method for mechanical properties of ring of filament-winding reinforced composites
| Valid |
| GB/T 1458-2008 | English | 185 |
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Test method for mechanical properties of ring of filament-winding reinforced plastics
| Obsolete |
| GB/T 1458-1988 | English | 279 |
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Test method for tensile strength of ring of filament-winding reinforced plastics
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GB/T 1458-2023: Test method for mechanical properties of ring of filament-winding reinforced composites
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT1458-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.120
CCS Q 23
Replacing GB/T 1458-2008
Test method for mechanical properties of ring of filament-
winding reinforced composites
Issued on: SEPTEMBER 07, 2023
Implemented on: APRIL 01, 2024
Issued by. State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 5
4 Method principle... 5
5 Specimen preparation... 7
6 Shear test... 11
7 Tensile test... 14
8 Test report... 18
Annex A (normative) Determination of tensile elastic modulus of unidirectional ring of
filament-winding reinforced composites... 19
Test method for mechanical properties of ring of filament-
winding reinforced composites
1 Scope
This document specifies the method and principle, specimen preparation, shear test,
tensile test and test report for mechanical properties of ring of filament-winding
reinforced composites.
This document is applicable to the determination of interlaminar shear strength, tensile
strength, tensile elastic modulus, fiber tensile strength of unidirectional ring of filament-
winding reinforced composites, and hoop tensile strength of filament-winding
reinforced composite tubes.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 1446, Fiber-reinforced plastics composites -- The generals for determination
of properties
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 Terms and definitions
There are no terms or definitions that require definition in this document.
4 Method principle
4.1 Specimen preparation method
4.1.1 Overview
The ring of filament-winding reinforced composites is made by single-ring winding
method or cylindrical ring cutting method. These two methods can be wet winding or
prepreg winding. The two winding processes are shown in Figure 1 and Figure 2
winding machine according to the specified inner diameter size, and then undergoes
curing, external surface processing, and demolding to produce a ring-shaped specimen.
4.1.3 Cylindrical ring cutting method
The cylindrical ring cutting method uses a cylindrical core mold to wind the specimen
into a cylinder on a winding machine according to the specified inner diameter size of
the specimen. After curing, outer surface processing, demolding and cutting, a ring-
shaped specimen is made.
4.2 Shear test method
The specimen is loaded by three-point bending. The load is applied at a specified
loading rate until the specimen fails. The failure load is recorded. The shear strength is
calculated.
4.3 Tensile test method
Place the specimen on the tensile plate of the testing machine. Apply tensile load at a
specified loading rate until the specimen fails. Record the failure load. Calculate the
tensile strength.
5 Specimen preparation
5.1 Equipment
5.1.1 Winding machine
The winding machine consists of a yarn frame, a rubber groove, a tension control device,
a wire guide hole and a driving mechanism.
5.1.2 Mold and core mold
Single ring mold is shown in Figure 3.Appropriate connecting shafts should be left at
both ends of the core mold of the cylindrical ring cutting method to facilitate the
assembly of the mold on the winding machine.
5.1.3 Demolding device
A suitable press can be used.
5.1.4 Curing device
The curing device should have an appropriate controllable temperature range. The
temperature control accuracy is ±2℃.
The fiber is drawn out from the yarn ball, passes through the guide roller, and enters the
glue groove with a heating device. When the fiber is pulled out from the glue groove,
the excess glue is removed by a device such as a glue squeeze roller or a scraper while
minimizing the wear of the fiber.
5.3.4 Tension control
The impregnated fibers are passed through a series of guide rollers to apply the required
tension to the fibers. Winding tension. 5%~8% of the fiber breaking strength for glass
fibers; 3%~4% of the fiber breaking strength for aramid fibers; and carbon fibers
according to process requirements, preferably without damaging the fibers.
5.3.5 Yarn arrangement
The fiber arrangement should be uniform, without accumulation, separation, etc. The
fiber should be evenly impregnated, with stable tension. The winding speed should not
exceed 60 r/min (the linear speed is 28 m/min).
5.3.6 Curing
After the annular specimen is wound, it shall be cured according to the prescribed
curing system. The storage time of the annular specimens wound in the same batch
before curing shall not exceed 8 h.
5.3.7 Processing and demolding
For the solidified single-ring specimen, first remove the outer molds on both sides,
string them together and perform surface processing by grinding or fine turning. After
processing, remove the middle mold by a press.
After solidification, the cylinder is first ground or precision turned for surface
processing, and then the ring is cut and demolded.
5.4 Prepreg winding process specimen preparation
The procedure for preparing the specimen by the prepreg method is basically the same
as the wet winding process. However, the preheating temperature of the mold and the
baking conditions, winding tension, winding speed, etc. of the prepreg tape must be
determined according to the technical conditions specified for the prepreg tape.
5.5 Filament-winding reinforced composite tube specimen
The specimens are cut directly from the filament-winding reinforced composite tube
and then machined. The two reduction planes are at a distance of 180°. The cross section
is at the center relative to the width of the specimen.
5.6 Type and size of test specimen
7.3.4 Install the specimen on the fixture. Align the scribe line of the unidirectional ring
of filament-winding reinforced composites or the reduced surface of the filament-
winding reinforced composite tube specimen with the gap of the tension plate. The
contact surface between the specimen and the fixture should be lubricated.
7.3.5 Apply load to the specimen evenly and continuously until failure. Record the
failure load.
7.3.6 The tensile elastic modulus of unidirectional ring of filament-winding reinforced
composites shall be measured in accordance with the provisions of Annex A.
7.3.7 The fiber volume content of glass fiber specimens shall be determined in
accordance with the provisions of GB/T 2577.The fiber volume content of carbon fiber
specimens shall be determined in accordance with the provisions of GB/T 3855.
7.4 Calculation
7.4.1 Tensile strength
Tensile strength is calculated according to formula (2).
Where,
σt - tensile strength of reinforced composite material, in megapascals (MPa);
pb - destructive load, in Newtons (N);
b - specimen width, in millimeters (mm);
h - specimen thickness, in millimeters (mm).
7.4.2 Tensile elastic modulus of unidirectional ring of filament-winding reinforced
composites
The calculation of tensile elastic modulus shall be carried out in accordance with the
provisions of Annex A.
7.4.3 Fiber tensile strength of unidirectional ring of filament-winding reinforced
composites
The fiber tensile strength is calculated according to formula (3).
Where,
σf - fiber tensile strength, in megapascals (MPa);
pb - destructive load, in Newtons (N);
b - specimen width, in millimeters (mm);
h - specimen thickness, in millimeters (mm);
Vf - fiber volume content, %.
7.5 Test results
The test results shall be in accordance with the provisions of GB/T 1446.
8 Test report
The test report shall include the following contents.
a) Name of the test item and the number of this document;
b) Type and specification of raw materials;
c) Ambient temperature and relative humidity when making the ring specimen;
d) Winding tension and speed;
e) Mold material;
f) Curing system;
g) Personnel and date of specimen making;
h) Type, number, shape, size, appearance quality and quantity of the specimen;
i) Test temperature, relative humidity and specimen state adjustment;
j) Model, range and use of test equipment and instruments;
k) Test results. providing a single value of each specimen performance (if necessary,
give the damage of each specimen), arithmetic mean, standard deviation and
dispersion coefficient;
l) Test personnel, date and others.
A.1.5 Calculate the tensile elastic modulus according to formula (A.1).
Where,
E - tensile elastic modulus, in megapascals (MPa);
Δp - load increment of the initial straight line segment on the load-strain curve, in
Newtons (N);
b - specimen width, in millimeters (mm);
h - specimen thickness, in millimeters (mm);
Δε1, Δε2 - strain increments on both sides corresponding to the load increment Δp,
respectively.
A.1.6 The number of specimens shall comply with the provisions of GB/T 1446.
A.1.7 The test results shall comply with the provisions of GB/T 1446.
A.2 Deformometer method
A.2.1 Install the strain gauge symmetrically on both sides of the tension plate gap (see
Figure A.1).
A.2.2 Operate according to the provisions of A.1.2, A.1.3 and A.1.4.
A.2.3 Calculate the tensile elastic modulus according to formula (A.2).
Where,
E - tensile elastic modulus, in megapascals (MPa);
Δp - load increment of the initial straight-line segment on the load-strain curve, in
Newtons (N);
b - specimen width, in millimeters (mm);
h - specimen thickness, in millimeters (mm);
D - specimen diameter, in millimeters (mm);
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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