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WANG Jun WANG Yinguan 《声学学报:英文版》2006,25(4):310-318
On the fact that an isotropic metal solid produces anisotropic property in the state of static stress, based on the theory of the nonlinear acoustoelasticity, the equivalent second order elastic constants are calculated for metal plate with static stress. For the case of thin metal plate with stress, the two kinds of dispersion equation for Lamb waves propagating parallel and vertical to the direction of static stress are derived. Using the equations, the relationships between Lamb wave velocity and static stress in a metal plate are discussed. 相似文献
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The optical reflectance by a metallic plate arranged with array consisting of subwavelength periodic square hole is investigated by using the three-dimensional finite-difference time-domain method (3D-FDTD). There are dips in the reflectivity spectra, which indicate the absorption peaks. The absorption peaks behave differently according to the ratio of hole width and the period of the hole array. Combined with the near fields of the absorption peaks, it is found that the surface plasmon (SP) resonance on the surface of plate and localized SP in the hole play a major role for the two absorptions. 相似文献
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本文给出了研究抛体大变形的光学实验测试方法,用该方法测定了水中爆炸作用下的金属板的变形过程,得到了金属板上任意点随时间变化的位移曲线和速度曲线以及金属板变形过程的真实位移场。该方法比常用的测量抛体运动速度的电测探针法前进了一步。 相似文献
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【题目】(2008年高考宁夏卷理综第21题)如图1所示,C为中间插有电介质的电容器,a和b为其两极板;a板接地.P和Q为两竖直放置的平行金属板,在两板间用绝缘线悬挂一带电小球.P板与b板用导线相连,Q板接地.开始时悬线静止在竖直方向,在b板带电后,悬线偏转了角度α.在以下方法中,能使悬线的偏角α变大的是A.缩小a,b间的距离B.加大a,b间的距离C.取出a,b两极板间的电介质 相似文献
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平板内后分叉的局部化带 总被引:1,自引:0,他引:1
已知剪切带状分叉将引发裂隙.为模拟其后继效应,本文利用大应变有限元的空单元技术设计了自动释放损伤单元内残余应力的方法.这种损伤松弛可以具有各向同性或各向异性的性质.结果显示,受单向拉伸平板中心的水平裂隙会向斜角方向辐射局部化带,带内有明显厚度颈缩及平面错动.由此说明实验所观察到的这类局限于带内的变形应属于后分叉的效应 相似文献