cohesive failure
Cohesive failure is a specific type of adhesive failure in which the adhesive itself fails due to internal weaknesses or insufficient strength. Unlike adhesive failure, where the adhesive does not adhere to any of the bonded surfaces, in cohesive failure, the adhesive breaks down the middle and the bond is severed without damaging any of the surfaces.
Cohesive failure occurs when the stresses acting on the bonded joint exceed the internal strength of the adhesive. This can be caused by a variety of factors including the type of adhesive, surface preparation, assembly conditions, environmental conditions, and the nature of the forces acting on the joint.
To avoid cohesive failure, it is important to choose the right adhesive for the application and to carry out careful surface preparation to ensure optimal adhesion. Installation conditions should also be considered to ensure the adhesive has adequate time and space to react and develop the required strength. Extreme temperatures or humidity can also degrade the adhesive, which can lead to cohesive failure.
In the event of a cohesive failure, it is important to determine the reason for the failure to avoid future problems. Possible causes can be insufficient adhesive strength, overloading of the adhesive joint or incorrect application of the adhesive. A thorough examination and analysis can help determine the cause of the breakage and take the necessary action to prevent future breakages.
Overall, cohesive failure is an important concept in adhesive engineering that should be considered when selecting and applying adhesives. By addressing the causes and risk factors for cohesive failure, high-quality, durable adhesive bonds can be created.
