The present invention discloses a soft phononic crystal with stretchable bandgap control. There are two kinds of scatterers regularly distributed in the two-dimensional plane of the base body. The elliptical long axes of the two kinds of scatterers are perpendicular to each other, and the two kinds of scatterers are staggered. The long axes of the first type scatterers and the short axes of the second type scatterers are in the same line in each row, and the short axes of the first type scatterers and the short axes of the second type scatterers in each row are The long axis of the second kind of scatterer is in the same straight line, and the matrix is isotropic homogeneous material with elastic modulus less than 10 MPa. The soft phononic crystal of the present invention adopts two kinds of crystal configurations with elliptical hole staggered arrangement. By stretching the soft phononic crystal, the band gap range can be gradually reduced, and the reverse regulation of \from being to not\ can be realized. The stretching regulation mode is more stable than the traditional compression regulation, and the effect of band gap regulation is better.
【技术实现步骤摘要】
一种可拉伸调控带隙的软声子晶体
本专利技术涉及一种软声子晶体,具体涉及一种可拉伸调控带隙的软声子晶体,该晶体是具有低频(1000Hz以下)带隙的二维软周期多孔声子晶体结构。
技术介绍
近年来,软材料的应用受到了越来越广泛的关注。将软材料与周期多孔结构相结合,基于软材料易于大变形及接近不可压的特性,可使多孔结构在外加载荷的作用下产生较为稳定的后屈曲变形,有效改变了结构原有的几何拓扑构型及瞬时切向刚度,从而进一步改变其带隙的分布,达到带隙调控的目的。另外,软材料的超弹性还可以保证结构在外加载荷移除后完全恢复到原有构型,从而使得这种调控作用可以多次反复实施,这为声学开关等器件的设计及弹性波传播的实施调控提供了新思路。目前关于机械加载调控结构声学特性的研究大多是通过施加压缩载荷来实现的。Bertoldi等人对圆孔多种排列方式的软材料周期结构施加不同程度的压缩载荷,发现施加不同程度的压力可使其产生多种后屈曲变形,从而获得不同的带隙特性,进一步达到带隙调控的目的。除了开孔周期结构,格栅结构也具有丰富的受压后屈曲变形及带隙调控性能。Chen等人研究了格栅结构的多种后屈曲构型,发 ...
【技术保护点】
1.一种可拉伸调控带隙的软声子晶体,其特征在于,在基体二维平面内规则分布有若干椭圆孔状的两类散射体,两类散射体的椭圆长轴彼此垂直,且两类散射体交错排列,每行中第一类散射体的长轴与第二类散射体的短轴在同一直线上,每列中第一类散射体的短轴与第二类散射体的长轴在同一直线,所述的基体为弹性模量小于10MPa的各向同性均匀材料。
【技术特征摘要】
1.一种可拉伸调控带隙的软声子晶体,其特征在于,在基体二维平面内规则分布有若干椭圆孔状的两类散射体,两类散射体的椭圆长轴彼此垂直,且两类散射体交错排列,每行中第...
【专利技术属性】
技术研发人员:高楠,李剑,鲍荣浩,陈伟球,
申请(专利权)人:浙江大学,
类型:发明
国别省市:浙江,33
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