Pull-Out Test
The Pull-Out Test is a practical test used to measure the strength of a bond between two surfaces. This type of test is utilized across different industries, such as civil engineering, automotive and shipping. It is a commonly used evaluation method to determine the mechanical strength of a bond, or bonding interface. This can help to ensure the quality of components and materials prior to their incorporation into products.
The Pull-Out Test is often referred to as a shear-loading test and is used to measure the load-supporting capacity of a bond. The test works by applying a pull-force to the two surfaces, while measuring the applied force required to pull one surface away from the other. It is usually performed by attaching two surfaces with a hand-held pull-hook. The pull-hook is attached to one surface and the pull-force is then applied.
From this test, the surface’s bonding resistance and strength can be accurately measured. Results will be given usually in Newtons, as this is an internationally accepted measure of force. High-restricted bonding results are placed around 30–40 KN, although this may vary depending on the materials being tested.
Aside from its primary function of evaluating the bonding quality of materials, the Pull-Out Test is also used to measure the surface adhesion of a variety of materials. This includes metals, plastics and ceramics; it can also be used to test surface-to-surface adhesion.
The principle behind the Pull-Out Test is very simple. It works by measuring the amount of force that is required to overcome the cohesive force of a bond. The pull-force is applied in a way that the two surfaces become detached. It is this tension that is then calculated and given in a unit of measure, usually Newtons.
The Pull-Out Test can be an effective means of progressively building an understanding of the adhesive, surface and bond strengths of a variety of materials. It is an essential process within the industrial production and design chain, allowing assurance of the quality of materials and components before product roll-out. This relatively simple process that is relatively easy to execute can prove to be invaluable within the production process.