Relationship between a non-spherical collapse of a bubble and a stress state inside a wall
Relationship between a non-spherical collapse of a bubble and a stress state inside a wall
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DOI：
10.1063/5.0136355
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发表时间：
2023-02-01
影响因子：
4.6
通讯作者：
Sasaki, Hirotoshi
中科院分区：
文献类型：
--
作者：
Iga, Yuka;Sasaki, Hirotoshi
本研究进行了流体/材料耦合的数值模拟的第一阶段的非球形崩溃的气泡附近的壁和调查的应力状态内的弹性材料的壁根据的变化，在气泡和壁之间的间距γ。对于典型的破裂模式：γ =-0.3时的饼状破裂模式、γ = 0时的半球状破裂模式、γ = 0.3 <γ < 1.0时的微射流破裂模式和γ> 1.2时的分离破裂模式，证实了气泡破裂行为与应力波传播之间的关系。对材料损伤的一个指标--应力影响区进行了估算。在0.3 < gamma < 1.0时，微射流引起的应力影响区在材料中较窄且较浅，而压力波引起的应力影响区则较宽且较深，尤其是在材料内部。这意味着压力波比微射流对材料损伤的影响更大，即使在微射流和压力波之间等效应力的最大值几乎相同。此外，尽管γ = 0时的体积和最大应力大于0.3 < gamma <0.5时的体积和最大应力，但0.3 < gamma < 0.5时的应力影响区深度大于gamma = 0时的深度。这表明，与半球形气泡塌陷相比，附着在壁面上的环形气泡回弹的情况有可能在材料内部引起更深的损伤。2023年作者。所有文章内容，除非另有说明，是根据知识共享署名（CC BY）许可证（http：//creativecommons.org/licenses/by/4.0/）。https://doi.org/10.1063/5.0136355
This study performed a fluid/material coupled numerical simulation of the first stage of a non-spherical collapse of a bubble near a wall and investigated the stress state inside the elastic material of the wall according to the change in the stand-off distance gamma between the bubble and the wall. The relationship between the collapse behavior of the bubble and propagation of stress waves was confirmed for typical collapse modes: pancake-shaped mode at gamma = -0.3, hemispherical mode at gamma = 0, microjet mode at 0.3 < gamma < 1.0, and detaching mode at gamma > 1.2. The stress influence area, which is an index of material damage, was estimated. At 0.3 < gamma < 1.0, the stress influence area caused by the microjet is narrow and shallow in the material; in contrast, that caused by the pressure waves spreads more widely and deeply, especially inside the material. This means that the pressure wave has a larger influence than the microjet on damage to a material even though the maximum value of the equivalent stress is nearly identical between the microjet and the pressure wave. Additionally, the depth of the stress influence area at 0.3 < gamma < 0.5 is larger than that at gamma = 0, although the volume and the maximum stress are larger at gamma = 0 than at 0.3 < gamma < 0.5. This indicates that the case of toroidal bubble rebound attaching to a wall has the potential to cause a deeper damage inside a material in comparison with hemispherical bubble collapse.@ 2023 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http:// creativecommons.org/licenses/by/4.0/). https://doi.org/10.1063/5.0136355