研究目的
Investigating the effect of second-harmonic generation of primary Lamb wave propagation in a two-layered composite plate and the influence of interfacial properties on this effect at low frequency.
研究成果
The study concludes that the efficiency of SHG by primary low-frequency dilatational Lamb waves can reveal a subtle change in the interfacial properties of the composite plate. This provides a promising means for sensitively assessing a minor change in the interfacial properties of layered composite plates.
研究不足
The study is limited to a two-layered composite plate with isotropic and homogeneous materials. The analysis is focused on low-frequency dilatational Lamb waves, and the effect of higher frequencies or other wave modes is not considered.
1：Experimental Design and Method Selection:
The study focuses on the analysis of the SHG effect of low-frequency dilatational Lamb wave propagation in a two-layered composite plate. Theoretical models and finite element simulations are employed to analyze the effect.
2：Sample Selection and Data Sources:
A two-layered composite plate with aluminum layers is considered. The materials are isotropic and homogeneous with no attenuation and no dispersion.
3：List of Experimental Equipment and Materials:
The study uses Comsol Multiphysics, a commercial FE software, for simulation. The materials of the two solid layers are aluminum with specified parameters.
4：Experimental Procedures and Operational Workflow:
The primary S0 mode is excited by enforcing a prescribed displacement with a Hanning-windowed sinusoidal tone-burst on the left end. The effect of SHG is analyzed under different interfacial properties.
5：Data Analysis Methods:
The efficiency of SHG is quantitatively described by the relative acoustic nonlinearity parameter. The group velocity and phase velocity are calculated to analyze the effect.
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