A Novel Fluid Structure Interaction Experiment to Investigate Deformation of Structural Elements Subjected to Impulsive Loading
A Novel Fluid Structure Interaction Experiment to Investigate Deformation of Structural Elements Subjected to Impulsive Loading
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DOI：
10.1007/s11340-006-0296-7
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发表时间：
2006-12
影响因子：
2.4
通讯作者：
H. Espinosa;Sungsoo S. Lee;N. Moldovan
中科院分区：
文献类型：
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作者：
H. Espinosa;Sungsoo S. Lee;N. Moldovan
本文提出了一种研究水下冲击载荷作用下结构动态变形的实验方法。该实验装置模拟了感兴趣的各种应用中遇到的流体-结构相互作用（FSI）。为了产生类似于爆炸的冲击载荷，设计并实现了飞片冲击实验。该设计是基于缩放分析，以实现实验室规模的设备，可以捕捉的基本特征，在变形和破坏的大型海军结构。在FSI装置中，由钢管制成的水室被并入气体枪设备中。钢管的一端固定有缩放结构，另一端由水活塞密封。飞片撞击水活塞并产生指数衰减的压力历史以代替爆炸。由飞板引起的压力传播并对结构（板试样）施加脉冲，其响应导致气泡形成和水空化。标定实验和数值模拟证明了实验装置的功能。对304不锈钢整体板在冲击载荷作用下的动态变形行为进行了试验和分析。实验诊断包括测量飞片撞击速度、水中压力波历史以及通过阴影云纹和高速摄影的全变形场。
This paper presents a novel experimental methodology for the study of dynamic deformation of structures under underwater impulsive loading. The experimental setup simulates fluid–structure interactions (FSI) encountered in various applications of interest. To generate impulsive loading similar to blast, a specially designed flyer plate impact experiment was designed and implemented. The design is based on scaling analysis to achieve a laboratory scale apparatus that can capture essential features in the deformation and failure of large scale naval structures. In the FSI setup, a water chamber made of a steel tube is incorporated into a gas gun apparatus. A scaled structure is fixed at one end of the steel tube and a water piston seals the other end. A flyer plate impacts the water piston and produces an exponentially decaying pressure history in lieu of explosive detonation. The pressure induced by the flyer plate propagates and imposes an impulse to the structure (panel specimen), which response elicits bubble formation and water cavitations. Calibration experiments and numerical simulations proved the experimental setup to be functional. A 304 stainless steel monolithic plate was tested and analyzed to assess its dynamic deformation behavior under impulsive loading. The experimental diagnostic included measurements of flyer impact velocity, pressure wave history in the water, and full deformation fields by means of shadow moiré and high speed photography.