Institute of Biomechanics and Medical Engineering, AML, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, PR China.
Soft Matter. 2016 May 14;12(18):4204-13. doi: 10.1039/c6sm00265j. Epub 2016 Apr 13.
Compression of a film/substrate bilayer system with different surface/interfacial structures can lead to diverse buckling patterns including sinusoidal wrinkles, ridges, folds, creases and tilted sawteeth wrinkles. In this paper, we show that elastic wave band gaps in the film/substrate bilayer system largely depend on the wrinkling patterns. More interestingly, we find that different wrinkling patterns investigated here can coexist and evolve in one bilayer system and the elastic wave propagation behaviors can be controlled by manipulating the hybrid wrinkling patterns. Our analysis also reveals that the periodic stress pattern plays a dominant role in tuning the bandgap structures in comparison to geometrical patterns caused by surface instability. A careful investigation of the transmission spectra of the composite systems has validated the main findings given by the analysis based on the Bloch wave theory. Potential use of the method and materials reported here to gain wide attenuation frequency ranges and the design of nesting Fibonacci superlattices have been demonstrated.
具有不同表面/界面结构的薄膜/基底双层系统的压缩会导致多种屈曲模式，包括正弦波皱纹、脊、褶皱、折痕和倾斜锯齿状皱纹。在本文中，我们表明，薄膜/基底双层系统中的弹性波带隙在很大程度上取决于起皱模式。更有趣的是，我们发现这里研究的不同起皱模式可以在一个双层系统中共存和演变，并且可以通过操纵混合起皱模式来控制弹性波传播行为。我们的分析还表明，与由表面不稳定性引起的几何图案相比，周期性的应力图案在调整带隙结构方面起着主导作用。对复合系统的传输谱的仔细研究验证了基于布洛赫波理论的分析给出的主要结果。已经证明了这里报道的方法和材料的潜在用途，以获得宽的衰减频率范围和嵌套斐波那契超晶格的设计。
