Abstract
During the manufacturing process of adhesive bonds different faults can occur, leading to a loss of structural integrity of the entire structure. This requires a thorough study of the connection behaviour in the presence of faults and localisation of such faults. For this purpose, double cantilever beam specimens were manufactured with and without predefined gaps. A soft, rubber-like adhesive system (Sikaflex®-521 UV) was investigated. The experimental investigations include several measurement methods to identify the deflection of the adherend beams and to calculate the J-Integral in situ during testing. Optical measurement techniques such as digital image correlation and shearography are compared to backface strain measurement by optical fibres. In addition to quantifying of the effects of certain defects on Mode I fracture behaviour, the applicability of the selected test methods and their respective limitations are discussed. All measurement methods are suitable for detecting gaps with different advantages and disadvantages. For example, it is possible to evaluate the J-integral from the backface strain and digital image correlation measurement with the deflection curve approach.
Published Version
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