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How to Perform a Shear Strength Test to ISO 4587

ISO 4587 is a widely adopted testing standard used to measure the shear strength of adhesion between rigid components. This guide is designed to introduce you to the basic elements of an ISO 4587 adhesive shear test, including the defination, principle, test procedure,etc .

1. What is ISO 4587

ISO 4587 is a International Standard that specifies the method for determining the tensile lap-shear strength of rigid-to-rigid bonded assemblies using a standard specimen under specified conditions of preparation and testing. This test is used to determine the strength of the component when it comes into contact with another object or surface. It also helps to predict the location of any weak points in the component and the potential failure risks.

2. What is the Principle of this Test

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.

3. How to conduct this test

3.1 Test Equipment Requirements

The testing Equipment need to meet the following requirements:

Tensile-testing machine

1. The rupture of the specimen falls between 10 % and 80 % of the full-scale capacity.

2. The machine shall be capable of maintaining a rate of loading of 8.3 MPa/min to 9.7 MPa/min.

3. The recorded force shall not differ from the true applied force by more than 1 %.

Grips

1. The construction of the grips and accessories should ensure that they can align with the sample immediately when a load is applied, thus making the direction of the applied force consistent.

2. Avoid using grips that operate by bolting through the adherends, as such fixtures can cause undesirable stress concentration.

3.2 Test Procedure

①Locate 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.

②Operate the machine at a constant test speed so that the average joint will be broken in a period of65 s ± 20 s.

③If a machine working at a constant rate of loading is used, apply the shear load at a rate of 8.3 MPa to 9.8 MPa per minute.

④Record the highest force during rupture as the breaking force for that specimen.

⑤Record the type of failure in accordance with ISO 10365.

3.3 Specimens Preparation

Size and shape:

The standard test sample is shown in Figure 1, with the overlap length being 12.5mm ± 0.25mm.

Adherend surface:

The recommended thickness of the adhesive layer is 0.2mm. It can be controlled using calibration lines or glass microspheres.

Surface treatments shall be in accordance with manufacturer's instructions or the appropriate standard (EN 13887).

3.4 Result Expression

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. 

Calculate shear strength: breaking force(N)÷shear area(mm²)