One dimensional Willis-form equations can retain time synchronization under spatial transformations

One dimensional Willis-form equations can retain time synchronization under spatial transformations
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一维 Willis 形式方程可以在空间变换下保持时间同步

DOI:
10.1016/j.ijsolstr.2017.12.032
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发表时间:
2018-06
影响因子:
3.6
通讯作者:
Xiang Z H
Xiang Z H
中科院分区:
工程技术2区
文献类型:
--
作者:
Yao R W;Xiang Z H

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与传统的弹性动力学方程相比,用坐标变换的方法给出了非均匀介质的一维弹性动力学方程的更全面的表述。这些修正方程考虑了预应力的梯度,使之具有形式不变性,并能在空间坐标变换下保持时间同步,符合一般不变性原理。通过数值算例,比较了修正方程和传统方程计算的波速分布。结果表明,只有当波动频率足够高时,传统方程才是修正方程的良好近似。
In contrast to the traditional elastodynamic equations, a more comprehensive formulation of one dimensional (1D) elastodynamic equations is given for inhomogeneous media by using the coordinate transformation method. These modified equations consider the gradient of pre-stresses so that they are form-invariant and can retain time synchronization under spatial coordinate transformation, which comply with the principle of general invariance. A numerical example is conducted to compare the distributions of wave speeds calculated by the modified equations and the traditional equations. It demonstrates that the traditional equations are good approximations of the modified equations only when the wave frequency is sufficiently high.
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