Adhesive joints sandwich panels

Ten prototype elements were tested in four-point bending tests under static and cyclic loading to determine the load-bearing behavior and capacity. The results of three representative bending tests are depicted in Fig. 11. As calculated, all sandwich panels failed by shear rupture of the core. The load level at which the shear failure occurred was significantly influenced by the quality of the adhesive bond between the notched core and concrete facings, [5]. After the tests, the joint quality of the panels was examined by saw cuts. 

X-ray inspection Radiography (X-ray) inspection can be used to detect voids or discontinuities in molded parts, adhesive bonds, iaminates, composites and panel constructions. This method is more expensive and requires more skilled experience than ultrasonic methods. The product must contain some metal powder or other suitable fdler to create enough contrast to make the defects visible. This method is applicable to honeycomb sandwich structures as well as metal and nomnetal joints. 

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