Optimum Design of Layered Elastic Stress Wave Attenuators

1967 ◽  
Vol 34 (3) ◽  
pp. 751-755 ◽  
Author(s):  
L. E. Anfinsen
Keyword(s):  
Stress Wave ◽  
Elastic Stress ◽  
Stress Amplitude ◽  
Stress Waves ◽  
Wave Form ◽  
One Dimensional ◽  
In Series ◽  
Optimal Material ◽  
Subsequent Propagation ◽  
Elastic Stress Wave

The problem of maximizing or minimizing the amplitude of stress waves propagating through a one-dimensional elastic layered structure is investigated. The properties of layers in series, situated between free and fixed surfaces, are used in deriving difference equations that relate the applied stress wave form at the free surface to the transmitted stress wave form at the fixed surface along characteristic paths. Optimal material requirements are determined for the first transmitted stress wave, which strongly influences the subsequent propagation. Similarity parameters are derived by transform methods which provide optimization criteria for the two-layer case. Materials are systematically selected that can provide stress amplitude reductions of more than 99 percent.

Study of Stress Wave Propagation in SHPB with NHDMOC

2013 ◽  
Vol 444-445 ◽  
pp. 158-162
Author(s):  
Ming Li Xu ◽  
Guang Ying Zhang ◽  
Ruo Qi Zhang
Keyword(s):  
Wave Propagation ◽  
Stress Wave ◽  
Elastic Stress ◽  
Constitutive Relationship ◽  
Stress Wave Propagation ◽  
One Dimensional ◽  
Elastic Bar ◽  
The One ◽  
Dispersion And Attenuation ◽  
Elastic Stress Wave

In this paper the NHDMOC method which succeeded in studying stress wave propagation with one dimensional strain was applied to study the one-dimensional stress wave propagation. In this paper, the ZWT nonlinear visco-elastic constitutive relationship with 7 parameters to NHDMOC, and corresponding equations were deduced The equations was verified from the comparison of elastic stress wave propagation in SHPB with elastic bar and visco-elastic bar respectively. Finally the dispersion and attenuation of stress wave in SHPB with visco-elastic bar was studied.

Application of Study on Liquid Ablation in Laser Propulsion

2014 ◽  
Vol 644-650 ◽  
pp. 4918-4921
Author(s):  
Cun Yan Cui
Keyword(s):  
Stress Wave ◽  
Physical Mechanism ◽  
Elastic Stress ◽  
Research Result ◽  
Liquid Propellant ◽  
Perceptual Knowledge ◽  
Laser Propulsion ◽  
Elastic Stress Wave

It was found that evaporation and thermal elastic stress wave and cavity were dominant phenomenon in laser-induced ablation propulsion with liquid propellant according to our perceptual knowledge established in relative experiment and by analysis of physical mechanism of laser-induced ablation of liquid. The research result of the above phenomenon was introduced in this paper in order to give some elicitations to the researchers who were interested in the mechanism of laser propulsion with liquid ablation.

ON ELASTIC STRESS WAVES IN AN IMPACTED PLATE

2014 ◽  
Vol 06 (04) ◽  
pp. 1450047 ◽  
Author(s):  
ZHANFANG LIU ◽  
XIAOYONG SUN ◽  
YUAN GUO
Keyword(s):  
Wave Motion ◽  
Elastic Stress ◽  
Wave Theory ◽  
Stress Waves ◽  
Ceramic Plate ◽  
Elastic Solids ◽  
Plate Impact ◽  
Impact Surface ◽  
Macro Scale ◽  
Elastic Stress Wave

Elastic stress wave theory is developed and the stress waves in the impacted plate are examined in the paper. Generalized linear elasticity is adopted where the couple stress and curvature tensor are both deviatoric tensors and they meet a linear constitutive relation. It is found that there exist volumetric, rotational, and deviatoric waves in the generalized elastic solids. However, for macro-scale elastic solids only two wave modes, namely a volumetric wave and a deviatoric wave should be taken into account. Wave motion in plate impact tests is studied that a volumetric wave and a deviatoric wave are proposed. A set of exact solutions is attained for elastic stress waves in an impact plate. Excitation of stress waves at impact surface and reflection at free surface are formulated. Propagation of stress waves in the plate is analyzed in the waveforms. The predicted stress history in a ceramic plate under impact is agreed very well with the experiment measurement.

160 Propagation of elastic stress wave in universal rate range load-cell

2015 ◽  
Vol 2015.28 (0) ◽  
pp. _160-1_-_160-2_
Author(s):  
Nagahisa OGASAWARA ◽  
Yusuke SHIGA ◽  
Chihiro KAKUNO ◽  
Hiroyuki YAMADA
Keyword(s):  
Stress Wave ◽  
Elastic Stress ◽  
Load Cell ◽  
Rate Range ◽  
Elastic Stress Wave

Determination of the Unloading Boundary in Longitudinal Elastic-Plastic Stress Wave Propagation

1971 ◽  
Vol 38 (4) ◽  
pp. 888-894 ◽  
Author(s):  
P. A. Tuschak ◽  
A. B. Schultz
Keyword(s):  
Wave Propagation ◽  
Moving Boundary ◽  
Stress Waves ◽  
Stress Wave Propagation ◽  
Initial Portion ◽  
One Dimensional ◽  
Elastic Plastic ◽  
In Series ◽  
Plastic Stress

For several types of excitation of one-dimensional elastic-plastic stress waves in a rod, unloading waves propagate which interact with the loading waves. The moving boundary at which this interaction occurs is the unloading boundary. A knowledge of the location of this boundary and the behavior exhibited on it is necessary for the solution of wave-propagation problems of this kind. A technique is presented to obtain an arbitrary number of terms in series expressions describing the response in semi-infinite rods. Several examples, including finite mass impact of the rod, are given to illustrate the use of the technique. The technique will determine the initial portion of the boundary in a finite length rod.

Optimal Design of Bundled Layered Elastic Stress Wave Attenuators

2012 ◽  
Vol 26 (3) ◽  
pp. 387-395 ◽  
Author(s):  
Xiaobo Luo ◽  
Amjad J. Aref ◽  
Gary F. Dargush
Keyword(s):  
Optimal Design ◽  
Stress Wave ◽  
Elastic Stress ◽  
Elastic Stress Wave

scholarly journals Design and Analysis of a Novel Piezoceramic Stack-based Smart Aggregate

Sensors ◽  
2020 ◽  
Vol 20 (22) ◽  
pp. 6438
Author(s):  
Guangtao Lu ◽  
Xin Zhu ◽  
Tao Wang ◽  
Zhiqiang Hao ◽  
Bohai Tan
Keyword(s):  
Resonance Frequency ◽  
Electromechanical Coupling ◽  
Structural Parameters ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Stress Waves ◽  
Parallel Connection ◽  
Smart Aggregate ◽  
In Series ◽  
Piezoelectric Wafers

A novel piezoceramic stack-based smart aggregate (PiSSA) with piezoceramic wafers in series or parallel connection is developed to increase the efficiency and output performance over the conventional smart aggregate with only one piezoelectric patch. Due to the improvement, PiSSA is suitable for situations where the stress waves easily attenuate. In PiSSA, the piezoelectric wafers are electrically connected in series or parallel, and three types of piezoelectric wafers with different electrode patterns are designed for easy connection. Based on the theory of piezo-elasticity, a simplified one-dimensional model is derived to study the electromechanical, transmitting and sensing performance of PiSSAs with the wafers in series and parallel connection, and the model was verified by experiments. The theoretical results reveal that the first resonance frequency of PiSSAs in series and parallel decreases as the number or thickness of the PZT wafers increases, and the first electromechanical coupling factor increases firstly and then decrease gradually as the number or thickness increases. The results also show that both the first resonance frequency and the first electromechanical coupling factor of PiSSA in series and parallel change no more than 0.87% as the Young’s modulus of the epoxy increases from 0.5 to 1.5 times 3.2 GPa, which is helpful for the fabrication of PiSSAs. In addition, the displacement output of PiSSAs in parallel is about 2.18–22.49 times that in series at 1–50 kHz, while the voltage output of PiSSAs in parallel is much less than that in parallel, which indicates that PiSSA in parallel is much more suitable for working as an actuator to excite stress waves and PiSSA in series is suitable for working as a sensor to detect the waves. All the results demonstrate that the connecting type, number and thickness of the PZT wafers should be carefully selected to increase the efficiency and output of PiSSA actuators and sensors. This study contributes to providing a method to investigate the characteristics and optimize the structural parameters of the proposed PiSSAs.

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