Introduction
Internal stresses within the adhesive or sealant joint can significantly reduce the inherent adhesive strength. Internal stresses can occur on setting or curing, but they may also develop due to the joint's aging in service. For example, internal stresses could occur by bending forces or by dimensional change of the substrate due to absorption of moisture or aging. This article will focus on internal stresses that occur during the setting process. These stresses are difficult to foresee and avoid. They are common to all adhesive and sealant joints and detract from the ultimate strength of the joint even before it is placed into service.
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