OS1716 積層複合材料における超音波伝搬挙動に及ぼす層間界面の影響(OS17-4 複合材料,OS-17 先端材料システムの力学とメゾスケールモデリング)

概要

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The influence of the interlaminar interfaces on the longitudinal wave propagation behavior in a multilayered composite material immersed in water is investigated through FEM analysis. Spring boundary conditions are applied to each interface and different interfacial stiffnesses are considered by varying the spring constants. The results of amplitude reflection coefficient of the laminate are compared with those obtained by the transfer matrix method. Good agreement is observed between the results of FEM and the transfer matrix method. Reflection coefficient strongly depends on frequency. It is also found that there exists a stop band, a frequency range in which the reflection coefficient is near or equal to unity, and that this became wider as the interfacial stiffness decreases. From the short-time Fourier transform of waveform data, waves reflected by each interface are found to contain a frequency range corresponding to the stop band.
一般社団法人日本機械学会の論文
2011-07-16