GB/T 7124-2008 in English

《GB/T 7124-2008胶粘剂 拉伸剪切强度的测定（刚性材料对刚性材料）》由TC185（全国胶粘剂标准化技术委员会）归口，主管部门为中国石油和化学工业联合会。
本标准代替ＧＢ／Ｔ７１２４―１９８６《胶粘剂拉伸剪切强度测定方法（金属对金属）》。本标准规定了刚性材料对刚性材料胶接件的拉伸剪切强度的测定方法。本标准也规定了试样制备及测试的条件。 本标准与ＧＢ７１２４―１９８６相比主要的差别如下：
―――修改了标准的名称；
―――增加了规范性引用文件（本版的第２章）；
―――粘接的材料从金属扩展为刚性材料（１９８６年版的第一章；本版的第一章）；
―――试样的粘接面长度由１２．５±０．５ ｍｍ 改为１２．５ ｍｍ±０．２５ ｍｍ（１９８６ 年版的４．１；本版的５．１）；
―――试板厚度由２．０±０．１ｍｍ 改为１．６ｍｍ±０．１ｍｍ（１９８６年版的４．１；本版的５．１）
―――增加了胶层厚度，及其控制方法（本版的５．２）；
―――将测试速度由原来的“５±１ｍｍ／ｍｉｎ”改为“将剪切力变化速率定在每分钟８．３ＭＰａ～９．８ＭＰａ之间。”（１９８６年版的３．１；本版的第七章）；
―――试验结果的表示由“算术平均值、最高值、最低值”改为“每个试样的破坏载荷或拉伸剪切强度，算术平均值和标准偏差。”（１９８６年版的８．２；本版的第八章）。

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.

This standard also specifies the conditions of specimen preparation and testing. This test procedure does not provide design information.

2 Normative references

The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding any corrigendum), or revisions of, any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the latest editions of the standards indicated below. For undated references, the latest edition of the normative document applies.

GB/T 2918 Plastics - Standard atmospheres for conditioning and testing (GB/T 2918-1998, ISO 291: 1997, IDT)
GB/T 16997 Adhesives - Designation of main failure patterns (GB/T 16977-1997, ISO 10365: 1992, IDT)
ISO 527-1:1993 Plastics - Determination of tensile properties - Part 1: General principles
ISO 17212 Structural adhesives - Guidelines for the surface preparation of metals and plastics prior to adhesive bonding

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.

Note 1: Single-lap specimens are economical, practical and easy to make. They are the most widely used specimens for development, evaluation and comparative studies involving adhesives and bonded products, including manufacturing quality control.

Note 2: The strength values obtained from the single-lap specimen shall not be used as allowable design-stress values for structural joints.

Foreword i
1 Scope
2 Normative references
3 Principle
4 Apparatus
5 Specimens
6 Conditioning
7 Test procedure
8 Expression of results
9 Precision
10 Test report