GB/T 7124-2008 PDF English
US$70.00 · In stock · Download in 9 secondsGB/T 7124-2008: Adhesives -- Determination of tensile lap-shear strength of rigid-to-rigid bonded assemblies 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 7124: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 7124-2008 | English | 70 |
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Adhesives -- Determination of tensile lap-shear strength of rigid-to-rigid bonded assemblies
| Valid |
| GB/T 7124-1986 | English | 239 |
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The method for determination of strength properties of adhesive in shear by tension loading (Metal to metal)
| Obsolete |
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GB/T 7124-2008: Adhesives -- Determination of tensile lap-shear strength of rigid-to-rigid bonded assemblies
---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/GBT7124-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.180
G 38
GB/T 7124-2008 / ISO 4587.2003
Replacing GB/T 7124-1986
Adhesives - Determination of tensile
lap-shear strength of rigid-to-rigid bonded assemblies
(ISO 4587.2003, IDT)
Issued on. JUNE 4, 2008
Implemented on. DECEMBER 1, 2008
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
1 Scope... 5
2 Normative References... 5
3 Principle... 5
4 Apparatus... 6
5 Specimens... 6
6 Conditioning... 8
7 Procedure... 8
8 Expression of results... 9
9 Precision... 9
10 Test report... 9
Foreword
This Standard equivalently adopts ISO 4587.2003 “Adhesives - Determination of
tensile lap-shear strength of rigid-to-rigid bonded assemblies” (English version).
This Standard replaces GB/T 7124-1986 “The method for determination of strength
properties of adhesive in shear by tension loading (Metal to metal)”.
This Standard equivalently translates ISO 4587.2003.In normative references, it uses
national standards to replace the international standards; the referenced standards’
contents have no difference with the international standards.
For ease of use, this standard makes the following editorial changes.
a) "this international standard" is replaced by "this Standard";
b) Delete the foreword of international standard;
c) Use decimal point “.” to replace the comma that is used as the decimal point.
The main differences of this Standard, compared with GB 7124-1986, are as follows.
- Modify the name of the standard;
- Add the normative references (Clause 2 of this edition);
- Expand the adhesive material from metal to rigid material (Clause 1 of 1986 edition;
Clause 1 of this edition);
- Adhesive surface length of the sample is changed from 12.5±0.5 mm to 12.5
mm±0.25 mm (4.1 of 1986 Edition 4.1; 5.1 of this edition);
- Test plate’s thickness is changed from 2.0±0.1 mm to 1.6 mm±0.1 mm (4.1 of 1986
Edition; 5.1 of this edition);
- Add the layer thickness and the control method (5.2 of this edition);
- The test speed is changed from "5±1 mm/min" to "the shear load at a rate of 8.3
MPa to 9.8 MPa per minute.” (3.1 of 1986 edition; Clause 7 of this edition)";
- The expression of test result is changed from "arithmetic mean, maximum value,
minimum value" to "the arithmetic mean and standard deviation of the breaking
force or the breaking of the valid specimens." (8.2 of 1986 version; Clause 8 of
this edition).
This Standard was proposed by China Petroleum and Chemical Industry Association.
This Standard shall be under the jurisdiction of National Adhesive Standardization
Technical Committee.
Drafting organisations of this Standard. Shanghai Rubber Products Research Institute
AND Beijing Tianshan New Materials Technology Co., Ltd.
The main drafters of this Standard. Yang Chenyun, Huiying and Xu Ning.
The previous standard replaced by this Standard is as follows.
- GB/T 7124-1986.
Adhesives - Determination of tensile
lap-shear strength of rigid-to-rigid bonded assemblies
1 Scope
This Standard specifies a method for determining the tensile lap-shear strength of rigid-
to-rigid bonded assemblies.
2 Normative References
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For 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.
3 Principle
Adhesive lap-shear bond strength is determined by stressing a single-overlap joint
between rigid adherends in shear by the application of a tensile force parallel to the
bond area and to the major axis of the specimen.
4 Apparatus
Tensile-testing machine should be selected so that the rupture of the specimen falls
between 10 % and 80 % of the full-scale capacity.
5 Specimens
A typical thickness is 0.2 mm. Thicknesses can be controlled by inserting a calibrated
wire spacer or small glass spheres in the bond area. If a wire spacer is used, the wire
shall lie parallel to the direction of application of the load as this minimizes the effect
of the wire on the joint.
6 Conditioning
The specimens shall be conditioned and tested in one of the standard conditioning
atmospheres specified in GB/T 2918.
7 Procedure
Locate the specimen symmetrically in the grips, with each grip 50 mm±1 mm from the
nearest edge of the overlap. A shim may be used in the grips so that the applied force
will be in the plane of the adhesive bond.
8 Expression of results
Express the results of the tests as the arithmetic mean of the breaking force, in
newtons, or the breaking stress, in megapascals, of the valid specimens. The lap shear
strength, in megapascals, is calculated by dividing the breaking force, in newtons, by
the shear area, in square millimetres.
9 Precision
This test is widely used and accepted. However, the precision is not known because
interlaboratory data are not available.
10 Test report
The test report shall include the following information.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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