Interior energy focusing within an elasto-plastic material
Interior energy focusing within an elasto-plastic material
复制标题
内部能量集中在弹塑性材料内
DOI：
10.1016/0020-7683(95)00137-9
复制
发表时间：
1996
影响因子：
3.6
通讯作者：
J. McManus
中科院分区：
文献类型：
--
作者：
M. Tadi;H. Rabitz;Kim Young Sik;A. Askar;J. Prévost;J. McManus
在本文中，我们考虑了利用设计的表面图案在固体的地下体积内聚焦声能的问题，并讨论了聚焦如何受到材料塑性屈服率的影响。基于固体的线性弹性模型，利用最优控制理论设计了产生有效地下声聚焦的表面力模式。由这些力产生的声波然后通过数值算法在显示塑性屈服的模型固体中传播。数值结果表明，随着力幅值的增大，在焦点处屈服开始发展，形成永久塑性变形扩展区；尽管在焦点附近出现了屈服，声能仍能以良好的效率传递到焦点体积。
In this paper we consider the problem of focusing acoustic energy within a subsurface volume in a solid by means of a designed surface pattern, and ask how that focusing is affected by plastic yield of the material. Surface force patterns that yield efficient subsurface acoustic focusing have been designed using optimal control theory, based on a linear elastic model of a solid. The acoustic waves generated by these forces then are propagated, via numerical algorithms, in a model solid that exhibits plastic yield. Numerical results indicate that as the amplitude of the force increases, yield begins to develop at the focus, with the formation of an expanding region of permanent plastic deformation. Despite the occurrence of yield near the focus, acoustic energy still can be delivered to the focal volume with good efficiency.