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ON THE EXPERIENCE OF COMPUTED X-RAY TOMOGRAPHY OF REINFORCED THREE-STRINGER PANELS MADE OF POLYMER COMPOSITE MATERIALS

Experimental studies of the possibility of the MCT method for NC three-stringer panels made of PCM by the method of autoclave molding have been carried out. Based on the results of the experimental studies, it was shown that the MCT method makes it possible with a high reliability to identify defects in composite structures at the stage of final inspection (immediately after production), which is especially important for highly loaded and critical structures made of carbon composite materials based on polymer matrices of various types. On the example of testing a three-stringer (reinforced) panel, it is shown that the presented structure as a whole does not have pronounced macrodefects, however, an accumulation of micro-layers is observed in the zone of transition of layers from the sheathing plane to the stringer, which indicates a slight decrease in the molding pressure in this zone. In the studies carried out, these microdefects are not critical, while the results of the tomogram can be used to slightly refine the shape of the tooling in the zone of transition of layers from the skin to the stringer to provide the required molding pressure. Thus, it has been shown that the SRT method is an effective tool for assessing the structure of reinforced composite panels, taking into account different degrees of damage. The high measurement accuracy and resolution of the MCT method allow realizing high reliability and information content of control and ensuring high reliability of PCM structures due to the following factors: • Structures with defects exceeding the maximum permissible ones are not allowed into operation by the technical control department (QCD); • Structures with defects close to the maximum permissible are taken out of service until their properties are restored; • Positioning of defects reduces the labor intensity of repair.