arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1405.3198cond-mat.soft
收藏

弹性固体中重力驱动的不稳定性

Gravity driven instability in elastic solids

Serge Mora, Ty Phou, Jean-Marc Fromental, Yves Pomeau

摘要:

我们证明了面向下的软弹性固体的自由表面的不稳定性。使用恒定密度$ρ$、剪切模量为$μ$的凝胶进行实验,将其置于深度为$h$的刚性圆柱形盘中。当上下颠倒时,凝胶的自由表面经历法向向外加速度$g$。对于具有$α^*\simeq 6$的$ρg h/μ<α^* $,它保持完全平坦,而在相反的情况下自发地出现稳定的模式。这种现象是由于引力能和弹性形变能的相互作用,使瑞利波迅速衰减,并在阈值处消失。

英文摘要:

We demonstrate the instability of the free surface of a soft elastic solid facing downwards. Experiments are carried out using a gel of constant density $ρ$, shear modulus $μ$, put in a rigid cylindrical dish of depth $h$. When turned upside down, the free surface of the gel undergoes a normal outgoing acceleration $g$. It remains perfectly flat for $ρg h/μ<α^* $ with $α^*\simeq 6$, whereas a steady pattern spontaneously appears in the opposite case. This phenomenon results from the interplay between the gravitational energy and the elastic energy of deformation, which reduces the Rayleigh waves celerity and vanishes it at the threshold.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑