Bonding strength can be said to be the most important indicator for measuring the mechanical properties of adhesives, and it is also the most valuable factor for purchasing adhesives. Do you know? In fact, bonding strength is just a general term. When conducting bonding strength tests on adhesives, we mainly conduct experiments and make determinations from three aspects: shear strength, tensile strength, and peel strength. Next, let's have a good discussion about the detection knowledge of shear, tensile, and peel strengths in adhesive testing.

Shear strength and tensile strength actually refer to the ability of an adhesive joint to withstand the maximum load parallel or perpendicular to the bonded surface. Most of the adhesive shear strength tests are carried out with a single - lap joint structure. However, according to the test method of ASTM D3528, using a double - lap shear test can result in a more balanced force, thereby reducing the influence of peel stress and cleavage stress in a single - lap test. The determination of the tensile - shear strength of adhesives is usually carried out simultaneously.

Peel strength mainly measures the 180 - degree peel resistance performance of adhesives, mainly for the bonding of flexible materials and rigid materials. Usually, the stress distribution, peel angle, thickness of the adhesive layer, etc. are the main factors affecting the adhesive peel strength test. When determining the peel strength of adhesives between metal materials, the non - uniform tearing strength test method is usually adopted.

Bonding strength is of great significance for whether an adhesive can firmly bond two or more materials, whether they are the same or different. And shear strength, tensile strength, and peel strength, as the three major means of bonding strength, can well reflect the mechanical properties of adhesives. Therefore, understanding the knowledge in these three aspects has a positive effect on both the production and application of adhesives.