Composite materials have the advantages of low density, high strength, friction resistance, ablation resistance, good high temperature performance, etc., and are widely used in high-tech fields such as aerospace. The accurate evaluation of the interface bonding strength of composite materials directly affects the effective use of composite materials. Ultrasound is one of the most extensive nondestructive testing techniques. For the debonding of the adhesive layer, the characteristic parameters used are mainly echo amplitude and reflected echo time, but for high attenuation materials, the debonding surface is small, etc. In the case of wave amplitude and reflection time, it is impossible to quantify defects using ultrasonic reflection. By measuring the non-linear coefficient of the bonding surface, the mechanical properties of the bonding surface can be evaluated accordingly, and the service life of the bonding surface can be predicted. Acoustic-ultrasonic technology experiment system based on Ritec-SNAP system Curve of stress wave factor (SWF) with curing time of adhesive layer Solution for non-linear research of composite bonding interface: Non-linear ultrasonic testing main system (customized according to requirements, the number of channels is optional, and the optimal frequency range is optional) SNAP accessories package (customized according to experiment, including impedance matching, attenuation configuration, filter device, duplex device, sampler, signal amplification device, etc.) SNAP oblique probe (customized according to experimental materials) Oscilloscope (observing and monitoring time-domain signals)
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