Fault nucleation, restriction, and aspect ratio in layered sections: Quantification of the strength and stiffness roles using numerical modeling

2013 ◽  
Vol 118 (8) ◽  
pp. 4446-4460 ◽  
Author(s):  
V. Roche ◽  
C. Homberg ◽  
M. Rocher
Keyword(s):  
Numerical Modeling ◽  
Aspect Ratio ◽  
Strength And Stiffness ◽  
Fault Nucleation

High Aspect-Ratio Nanocrystalline CuNi T-Structures and Micro-Gears: Synthesis, Numerical Modeling and Characterization

2019 ◽  
Vol 166 (10) ◽  
pp. E310-E316 ◽  
Author(s):  
Cristina V. Manzano ◽  
Patrik Schürch ◽  
Laszlo Pethö ◽  
Gerhard Bürki ◽  
Johann Michler ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Aspect Ratio ◽  
High Aspect Ratio

2D numerical modeling of naturally fractured media using finite elements with high aspect ratio

2017 ◽  
Author(s):  
Pedro Rogério Cleto ◽  
Osvaldo Luís Manzoli ◽  
Heber Agnelo Antonel Fabbri ◽  
Eduardo Alexandre Rodrigues ◽  
José Henrique Krähenbühl Ambiel
Keyword(s):  
Numerical Modeling ◽  
Finite Elements ◽  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Fractured Media ◽  
Naturally Fractured

Numerical modeling of high aspect ratio flexible fibers in inertial flows

2017 ◽  
Vol 29 (9) ◽  
pp. 093302 ◽  
Author(s):  
D. Kunhappan ◽  
B. Harthong ◽  
B. Chareyre ◽  
G. Balarac ◽  
P. J. J. Dumont
Keyword(s):  
Numerical Modeling ◽  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Flexible Fibers

EVALUATION OF THE TIME-DEPENDENT CHARACTERISTICS OF GROUTED SAND USING AN ELASTIC WAVE

2008 ◽  
Vol 22 (11) ◽  
pp. 899-904 ◽  
Author(s):  
JOOWON KIM ◽  
KI-IL SONG ◽  
GYE-CHUN CHO ◽  
SEOK-WON LEE
Keyword(s):  
Numerical Modeling ◽  
Elastic Wave ◽  
Elastic Waves ◽  
Experimental Tests ◽  
Time Dependent ◽  
Soft Ground ◽  
Large Section ◽  
Wave Velocities ◽  
Dependent Behavior ◽  
Strength And Stiffness

For a better evaluation of a grouted zone during and after tunnel construction involving weak soil layers, it is necessary to estimate the characteristics of grouted zone effectively. This study suggests a method that can be used for characterizing the time-dependent behavior of pre-reinforced zones around a large section of tunnel in soft ground using elastic waves. Experimental tests were performed to characterize the time-dependent behavior of the pre-reinforced zone. Experimental results show that shear strengths as well as elastic wave velocities increase with the curing time. Thus, shear strength or strength parameters can be uniquely correlated to elastic wave velocities. It is possible to characterize grouted soils around tunnel using elastic waves. Time-dependent strength and stiffness parameters in the experimental tests were applied in a numerical modeling of a large-section tunnel in soft ground, taking into account its construction sequence. According to the results of the numerical modeling, displacement results for fewer than 2~3 days of constant time boundary conditions are nearly identical to the analysis results of the time-dependent condition. The proposed analysis method, which combines experimental and numerical procedures while considering the time-dependent effect of the pre-reinforced zone on the tunnel behavior, will provide a reliable and practical design basis and a means of analysis for large-section tunnels in soft ground.

Numerical Modeling of Damping Characteristics in a Torsional Micro-Resonator

2012 ◽  
Author(s):  
Tathagata Acharya ◽  
Michael J. Martin
Keyword(s):  
Numerical Modeling ◽  
Phase Shift ◽  
Aspect Ratio ◽  
Dynamic Response ◽  
Dynamic Behavior ◽  
Ambient Air ◽  
Damping Characteristics ◽  
Micro Resonator ◽  
Parameters Of Interest

The dynamic behavior of torsional micro-resonators with dimensions, 100 μm × 20 μm, 100 μm × 10 μm, 100 μm × 5 μm, and 100 μm × 2.5 μm are modeled under continuum conditions in ambient air and different liquids and at angular frequencies of 1000 Hz and 5000 Hz respectively. The dynamic response in terms of energy lost per cycle, torsional amplitude and the phase shift are calculated and non-dimensionalized suitably. Finally efforts have been made to establish a relationship between the parameters of interest and the aspect ratio.

Cellulose Nanowhiskers Reinforced Green Nanocomposites: Some Recent Development

2015 ◽  
Vol 1125 ◽  
pp. 217-221
Author(s):  
Azman Hassan ◽  
Reza Arjmandi ◽  
M.K. Mohamad Haafiz
Keyword(s):  
Mechanical Properties ◽  
Aspect Ratio ◽  
High Strength ◽  
Cellulose Nanowhiskers ◽  
Low Weight ◽  
Multi Level ◽  
Green Polymers ◽  
Strength And Stiffness ◽  
Effective Reinforcement ◽  
Cellulose Materials

Cellulose is the most abundant biomass material in nature. Due to their abundance, high strength and stiffness, low weight and biodegradability, cellulose materials serve as promising candidates for bio-composites production. Extracted from natural fibres, its hierarchical and multi-level organization allows different kinds of cellulosic fillers to be obtained; microcrystalline cellulose (MCC) and cellulose nanowhiskers (CNW). Because of the high aspect ratio and nanoscopic size, CNW has shown to be an effective reinforcement to many polymers. The use of CNW as reinforcements in nanocomposites is becoming increasingly attractive leading to green nanocomposites; biodegradable and renewable. Among the green polymers, polylactic acid (PLA) acid has shown to be very popular due to the good mechanical properties. This paper will provide a review of recent studies on the use of CNW in various green polymers with greater emphasis on PLA. Comparison between the effects MCC and CNW in the nanocomposites will also be discussed.

Numerical Modeling of Wet Cooling Towers—Part 2: Application to Natural and Mechanical Draft Towers

1983 ◽  
Vol 105 (4) ◽  
pp. 736-743 ◽  
Author(s):  
A. K. Majumdar ◽  
A. K. Singhal ◽  
H. E. Reilly ◽  
J. A. Bartz
Keyword(s):  
Experimental Data ◽  
Mathematical Model ◽  
Numerical Modeling ◽  
Aspect Ratio ◽  
Atmospheric Pressure ◽  
Air Travel ◽  
Analysis Tool ◽  
Cooling Towers ◽  
Self Consistent ◽  
The Mathematical Model

This paper presents several applications of the mathematical model described in Part 1 of the paper. Natural and mechanical draft towers of counterflow and crossflow arrangement have been considered. Predicted thermal performances compare well with the available data from operating towers. The distributions of air velocities, pressure, temperature, moisture fraction, and water temperature have been assessed from the considerations of physical plausibility only, since no experimental data are available for comparison. Some sample parametric computations for a mechanical draft crossflow tower are also presented. The parameters studied are: (a) air travel dimension of fill; (b) aspect ratio of fill; (c) fan power; and (d) atmospheric pressure. The results are self-consistent and demonstrate the applicability of the model as an analysis tool.

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