Effect of Filling Humidity on the Propagation of High-Amplitude Stress Waves through an Artificial Joint

2018 ◽  
Vol 42 (1) ◽  
pp. 20170192 ◽  
Author(s):  
Xiaolin Huang ◽  
Shengwen Qi ◽  
Wei Yao ◽  
Kaiwen Xia
Keyword(s):  
High Amplitude ◽  
Stress Waves ◽  
Artificial Joint

Propagation of high amplitude stress waves through a filled artificial joint: An experimental study

2016 ◽  
Vol 130 ◽  
pp. 1-7 ◽  
Author(s):  
Xiaolin Huang ◽  
Shengwen Qi ◽  
Kaiwen Xia ◽  
Hong Zheng ◽  
Bowen Zheng
Keyword(s):  
Experimental Study ◽  
High Amplitude ◽  
Stress Waves ◽  
Artificial Joint

Laser generation of high‐amplitude stress waves in materials

1979 ◽  
Vol 50 (3) ◽  
pp. 1497-1502 ◽  
Author(s):  
B. P. Fairand ◽  
A. H. Clauer
Keyword(s):  
High Amplitude ◽  
Stress Waves ◽  
Laser Generation

scholarly journals Dynamic Response and Fracture of Composite Gun Tubes

2001 ◽  
Vol 8 (3-4) ◽  
pp. 229-238 ◽  
Author(s):  
Jerome T. Tzeng
Keyword(s):  
Fatigue Life ◽  
Dynamic Response ◽  
Material Properties ◽  
Fracture Behavior ◽  
High Amplitude ◽  
Critical Value ◽  
Stress Waves ◽  
Cyclic Stresses ◽  
Dynamic Amplification ◽  
Very High

The fracture behavior due to dynamic response in a composite gun tube subjected to a moving pressure has been investigated. The resonance of stress waves result in very high amplitude and frequency strains in the tube at the instant and location of pressure front passage as the velocity of the projectile approaches a critical value. The cyclic stresses can accelerate crack propagation in the gun tube with an existing imperfection and significantly shorten the fatigue life of gun tubes. The fracture mechanism induced by dynamic amplification effects is particularly critical for composite overwrap barrels because of a multi-material construction, anisotropic material properties, and the potential of thermal degradation.

scholarly journals Elastic–Plastic Wave Propagation in Uniform and Periodic Granular Chains

2015 ◽  
Vol 82 (8) ◽  
Author(s):  
Hayden A. Burgoyne ◽  
Chiara Daraio
Keyword(s):  
Wave Propagation ◽  
Hopkinson Bar ◽  
High Amplitude ◽  
Pulse Velocity ◽  
Stress Waves ◽  
Laser Vibrometer ◽  
Particle Properties ◽  
Elastic Plastic ◽  
Rate Dependent ◽  
Granular Chains

We investigate the properties of high-amplitude stress waves propagating through chains of elastic–plastic particles using experiments and simulations. We model the system after impact using discrete element method (DEM) with strain-rate dependent contact interactions. Experiments are performed on a Hopkinson bar coupled with a laser vibrometer. The bar excites chains of 50 identical particles and dimer chains of two alternating materials. After investigating how the speed of the initial stress wave varies with particle properties and loading amplitude, we provide an upper bound for the leading pulse velocity that can be used to design materials with tailored wave propagation.

scholarly journals Numerical Simulation on Seismic Response of the Filled Joint under High Amplitude Stress Waves Using Finite-Discrete Element Method (FDEM)

Materials ◽  
2016 ◽  
Vol 10 (1) ◽  
pp. 13 ◽  
Author(s):  
Xiaolin Huang ◽  
Qi Zhao ◽  
Shengwen Qi ◽  
Kaiwen Xia ◽  
Giovanni Grasselli ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Discrete Element Method ◽  
Seismic Response ◽  
Discrete Element ◽  
High Amplitude ◽  
Stress Waves ◽  
Filled Joint ◽  
Element Method

Analysis of Leakage Failures in Flash Memory Devices and Root Cause Identification

2000 ◽  
Author(s):  
J. N. C. de Luna ◽  
M. O. del Fierro ◽  
J. L. Muñoz
Keyword(s):  
Flash Memory ◽  
Electromagnetic Interference ◽  
Yield Loss ◽  
High Amplitude ◽  
Physical Analysis ◽  
Input Buffer ◽  
Automated Test Equipment ◽  
Root Cause ◽  
Root Cause Identification ◽  
Test Process

Abstract An advanced flash bootblock device was exceeding current leakage specifications on certain pins. Physical analysis showed pinholes on the gate oxide of the n-channel transistor at the input buffer circuit of the affected pins. The fallout contributed ~1% to factory yield loss and was suspected to be caused by electrostatic discharge or ESD somewhere in the assembly and test process. Root cause investigation narrowed down the source to a charged core picker inside the automated test equipment handlers. By using an electromagnetic interference (EMI) locator, we were able to observe in real-time the high amplitude electromagnetic pulse created by this ESD event. Installing air ionizers inside the testers solved the problem.

APPLICATION OF THE EMPIRICAL MODE DECOMPOSITION METHOD TO GROUND-ROLL NOISE ATTENUATION IN SEISMIC DATA

2013 ◽  
Vol 31 (4) ◽  
pp. 619 ◽  
Author(s):  
Luiz Eduardo Soares Ferreira ◽  
Milton José Porsani ◽  
Michelângelo G. Da Silva ◽  
Giovani Lopes Vasconcelos
Keyword(s):  
Empirical Mode Decomposition ◽  
Seismic Data ◽  
Low Frequency ◽  
High Amplitude ◽  
Seismic Line ◽  
Seismic Processing ◽  
Mode Decomposition ◽  
Ground Roll ◽  
Fortran 90 ◽  
Emd Method

ABSTRACT. Seismic processing aims to provide an adequate image of the subsurface geology. During seismic processing, the filtering of signals considered noise is of utmost importance. Among these signals is the surface rolling noise, better known as ground-roll. Ground-roll occurs mainly in land seismic data, masking reflections, and this roll has the following main features: high amplitude, low frequency and low speed. The attenuation of this noise is generally performed through so-called conventional methods using 1-D or 2-D frequency filters in the fk domain. This study uses the empirical mode decomposition (EMD) method for ground-roll attenuation. The EMD method was implemented in the programming language FORTRAN 90 and applied in the time and frequency domains. The application of this method to the processing of land seismic line 204-RL-247 in Tacutu Basin resulted in stacked seismic sections that were of similar or sometimes better quality compared with those obtained using the fk and high-pass filtering methods.Keywords: seismic processing, empirical mode decomposition, seismic data filtering, ground-roll. RESUMO. O processamento sísmico tem como principal objetivo fornecer uma imagem adequada da geologia da subsuperfície. Nas etapas do processamento sísmico a filtragem de sinais considerados como ruídos é de fundamental importância. Dentre esses ruídos encontramos o ruído de rolamento superficial, mais conhecido como ground-roll . O ground-roll ocorre principalmente em dados sísmicos terrestres, mascarando as reflexões e possui como principais características: alta amplitude, baixa frequência e baixa velocidade. A atenuação desse ruído é geralmente realizada através de métodos de filtragem ditos convencionais, que utilizam filtros de frequência 1D ou filtro 2D no domínio fk. Este trabalho utiliza o método de Decomposição em Modos Empíricos (DME) para a atenuação do ground-roll. O método DME foi implementado em linguagem de programação FORTRAN 90, e foi aplicado no domínio do tempo e da frequência. Sua aplicação no processamento da linha sísmica terrestre 204-RL-247 da Bacia do Tacutu gerou como resultados, seções sísmicas empilhadas de qualidade semelhante e por vezes melhor, quando comparadas as obtidas com os métodos de filtragem fk e passa-alta.Palavras-chave: processamento sísmico, decomposição em modos empíricos, filtragem dados sísmicos, atenuação do ground-roll.

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