Application of transmission photoelasticity in visualizing fluid-structure interactions
Application of transmission photoelasticity in visualizing fluid-structure interactions
复制标题
透射光弹性在流体-结构相互作用可视化中的应用
DOI：
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
F. Ayancik
中科院分区：
文献类型：
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作者：
E. Etter;K. Mulleners;F. Ayancik
光弹性是一种应力分析技术，其原理是某些材料在受到应力时充当波片。在这项研究中，透射光弹性被用作一种新的光学技术来捕捉流动信息。设计了一种仿生结构，其包括插入到由光弹性材料制成的感测基座中的胡须状轴。当受胡须启发的结构遇到流动刺激时，其偏转并在感测基座中产生高弯曲应力，该高弯曲应力被转换成与流动刺激相关的条纹图案。使用圆偏振镜观察图案，然后将其与结构所遇到的流动刺激相关联。结果表明，这种光学方法可以用来连接一个特定的条纹图案与相应的自由流速度的整体精度为85.7%。此外，该技术能够检测生物启发结构上游的障碍物。透射光弹性可以帮助设计流量传感装置。
Photoelasticity is a stress analysis technique based on the principle that some materials act as waveplates when stressed. In this study, transmission photoelasticity is used as a novel optical technique to capture flow information. A bio-inspired structure is designed comprising a whisker-like shaft inserted into a sensing base made of photoelastic material. When the whisker-inspired structure encounters a flow stimulus, it deflects and generates a high bending stress in the sensing base that is transduced into a fringe pattern that correlates with the flow stimulus. The pattern is observed using a circular polariscope and is then linked to the flow stimulus encountered by the structure. The results show that this optical method can be employed to link a specific fringe pattern with the corresponding free stream velocity with a global accuracy of 85.7%. Also, this technique is able to detect an obstacle upstream of the bio-inspired structure. Transmission photoelasticity could help design flow sensing devices.