Reference solution
=====================


Calculation method
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The aim is to calculate the response of a solid block subjected to harmonic pressure on its upper face. The reference solution is obtained by performing a transient response calculation on a physical basis using the Newmark integration scheme with the parameters :math:`\mathit{alpha}\mathrm{=}0.25` and :math:`\mathit{delta}\mathrm{=}0.5`.


Reference quantities and results
-----------------------------------

It is proposed to test the following quantities:


* Move next :math:`x` to coordinate point :math:`(0.1575,0.125,0)`


* Stress and deformation at the Gauss point of a cell containing the coordinate node :math:`(0.3325,0.05,0)`


* Stress and deformation at coordinate node :math:`(0.3325,0.05,0)`


Uncertainty about the solution
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It is considered that the regime is established after 90 periods of excitement. The reference values used are those recorded over the 98th and 99th periods of the transitory response.