Abstract
In the case of assuming that the debonding interface layer was a thin fluid layer and taking the structural boundary conditions into consideration, we derived the expressions of ultrasonic reflection/transmission coefficients in a thick adhesive layer composite structure with debonding and slip defects under water immersion conditions based on the global matrix method. In addition, the finite element method was used to calculate the ultrasonic reflection/transmission coefficients when the bonding interface is debonded and slipped in the bonding structure. The theoretical calculation and simulation results are in complete agreement. The influences of the position of the interface defects (upper or lower interface of the adhesive layer) and defect types (slippage, debonding) on the ultrasonic reflection characteristics were also studied. The results show that if the incident angle and frequency of the sound wave are set appropriately, the perfected bonding, slippage and debonding interfaces can be distinguished.
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