Peel test tensile deformation

When testing peel adhesion, the angle of peel usually determines which type of stress is applied to the adhesive. In 90 peel tests, the tensile modulus is revealed while all other angles of peel are a blend of tensile and shear modulus. To test the liquid properties of the adhesive in a slow deformation, it is necessary to keep the adhesive test area a constant (such as is done in shear testing). 

Adhesion tests may be divided into the methods by which stress is applied to the lilm/coating. Adhesion test methods include tensile tests, peel tests, shear tests, deformation tests, energy deposition tests, fatigue (thermal, mechanical) tests, and many others. Some of these tests are depicted in Figure 12.3. Adhesion testing of thin films on flexible substrates such as webs is a particularly difficult problem.f ... 

When this method is applied to MID It is important to bear in mind that a comparatively large test metallization is needed. Empirical experience indicates that connectors for peel-off testing should be more than 800 pm in width. The metallization should be at least 17 pm thick in order to withstand the necessary tensile forces. The common metallizations such as LPKF-LDS plating therefore often require galvanic overplating to bring them up to the necessary thickness. The thickness of the metallization influences the result, and this has to be taken into account. Deformation of the metal layer factors into the measurement result. Consequently, the result cannot be applied one-to-one to combinations of materials other than that tested. 

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