Plate bending wave propagation behavior under metal sphere impact loading

2018 ◽  
Vol 32 (3) ◽  
pp. 1117-1124 ◽  
Author(s):  
Seong-In Moon ◽  
To Kang ◽  
Jung-Seok Seo ◽  
Jeong-Han Lee ◽  
Soon-Woo Han ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Impact Loading ◽  
Plate Bending ◽  
Metal Sphere ◽  
Propagation Behavior ◽  
Bending Wave

Speed of stress wave propagation in lung

1986 ◽  
Vol 61 (2) ◽  
pp. 701-705 ◽  
Author(s):  
R. T. Yen ◽  
Y. C. Fung ◽  
H. H. Ho ◽  
G. Butterman
Keyword(s):  
Wave Propagation ◽  
Stress Wave ◽  
Impact Loading ◽  
Wave Speed ◽  
Dynamic Pressure ◽  
Transpulmonary Pressure ◽  
Lung Parenchyma ◽  
Surface Velocity ◽  
Stress Wave Propagation ◽  
Rabbit Lung

The speed of stress waves in the lung parenchyma was investigated to understand why, among all internal organs, the lung is the most easily injured when an animal is subjected to an impact loading. The speed of the sound is much less in the lung than that in other organs. To analyze the dynamic response of the lung to impact loading, it is necessary to know the speed of internal wave propagation. Excised lungs of the rabbit and the goat were impacted with water jet at dynamic pressure in the range of 7–35 kPa (1–5 psi) and surface velocity of 1–15 m/s. The stress wave was measured by pressure transducer. The distance between the point of impact and the sensor at another point on the far side of the lung and the transit time of the stress wave were measured. The wave speed in the goat lung was found to vary from 31.4 to 64.7 m/s when the transpulmonary pressure Pa-Ppl was varied from 0 to 20 cmH2O where Pa represents airway pressure and Ppl represents pleural pressure. In rabbit lung the wave speed varied from 16.5 to 36.9 m/s when Pa-Ppl was varied from 0 to 16 cmH2O. Using measured values of the bulk modulus, shear modulus, and density of the parenchyma, reasonable agreement between theoretical and experimental wave speeds were obtained.

Bending-wave propagation by microtubules and flagella

1988 ◽  
Vol 90 (1-2) ◽  
pp. 247-263 ◽  
Author(s):  
Charles J. Brokaw
Keyword(s):  
Wave Propagation ◽  
Bending Wave

Origami Metastructures for Tunable Wave Propagation

2016 ◽  
Author(s):  
M. Thota ◽  
S. Li ◽  
K. W. Wang
Keyword(s):  
Wave Propagation ◽  
Periodic Structures ◽  
Bravais Lattice ◽  
The Novel ◽  
Acoustic Wave Propagation ◽  
New Class ◽  
Wave Characteristics ◽  
Propagation Behavior ◽  
Numerical Studies ◽  
Wave Tailoring

Wave propagation inside a host media with periodically distributed inclusions can exhibit bandgaps. While controlling acoustic wave propagation has large impact on many engineering applications, studies on broadband acoustic bandgap (ABG) adaptation is still outstanding. One of the important properties of periodic structure in ABG design is the lattice-type. It is possible that by reconfiguring the periodic architectures between different lattice-types with fundamentally distinct dispersion relations, we may achieve broadband wave propagation tuning. In this spirit, this research pioneers a new class of reconfigurable periodic structures called origami metastructures (OM) that can achieve ABG adaption via topology reconfiguration by rigid-folding. It is found that origami folding, which can enable significant and precise topology reconfigurations between distinct Bravais lattice-types in underlying periodic architecture, can bring about drastic changes in wave propagation behavior. Such versatile wave transmission control is demonstrated via numerical studies that couple wave propagation theory with origami folding kinematics. Further, we also exploit the novel ABG adaptation feature of OM to design structures that can exhibit unique tunable non-reciprocal behavior. Overall the broadband adaptable wave characteristics of the OM coupled with scale independent rigid-folding mechanism can bring on-demand wave tailoring to a new level.

Sign in / Sign up

Export Citation Format

Share Document