Adhesive joints of bonded metal to composite materials are a recent development and in a high interest in automotive and aerospace industry. Current industrial progress substitutes metal components by carbon fiber reinforced plastic (CFRP) in a load bearing structures due to reduction of weight and energy saving. However, not all metal components can be replaced by CFRP. In this case, combination of metal and CFRP gives improved enhancement of the structure. It is challenging to detect disbonding type defects in bonding area between dissimilar joints due to different properties of metal and composite materials and multilayered structure. Though extensive work was done to evaluate interface bonding in similar material joints yet not enough attention was paid to dissimilar joints. This work presents high quality nondestructive testing (NDT) process which includes quantitative evaluation, experimental study and model assisted probability of detection (MAPOD) evaluation. Ultrasonic pulse echo technique was used for inspection of adhesively bonded aluminum to CFRP in order to detect disbonds which occur between dissimilar layers. Computer modelling was performed in order to learn behavior of ultrasonic wave transmitted and reflected in the case of dissimilar joints. To verify modelling results experimental study was performed using 10MHz focused transducer in immersion pulse echo mode. Sensitivity analysis of parameters that can influence the measurement was performed as well as MAPOD assessment.
High Quality Process of Ultrasonic Nondestructive Testing of Adhesively Bonded Dissimilar Materials
2020-06-01
2209282 byte
Conference paper
Electronic Resource
English
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