Study on the Distribution of Frictional Forces on Z-Yarn Continuous Implanted Preforms and Its Application

2021 ◽  
Author(s):  
Zitong Guo ◽  
Zhongde Shan ◽  
JiHua Huang ◽  
Debo Xue
Keyword(s):  
Friction Force ◽  
Fracture Strength ◽  
Frictional Force ◽  
Tensile Force ◽  
Distribution Model ◽  
Tensile Fracture ◽  
Fiber Fracture ◽  
Measuring Device ◽  
Frictional Forces ◽  
The One

Abstract In order to improve the quality and efficiency of the Z-directional 3D preform forming, the Z-yarn friction force distribution model of the preform and its wear mechanism were investigated. Designed the tensile force measuring device of the replacement guide sleeves,the measured tensile force is equivalent to the Z-yarn friction force. Found that the frictional force was proportional to the number of preform layers, the frictional force applied to the one preform decreased from the corner, edge, sub-edge and middle in order. Established BP neural network model to predict the friction at different positions of preform with different layers, the error is within1.9%. The wear of Z-yarn was studied at different frictional positions and after different times of successive implantation into the preform, showed that with the increase of the number of Z-yarn implantation and the friction force, the amount of carbon fiber bundle hairiness gradually increase, and the tensile fracture strength damage of the fiber is increasingly affected by the friction force,and in the corner position of the preform, when the number of implantation is 25 times, the fiber fracture strength will occur non-linearly and substantially decreased, in order to avoid fiber fracture in the implantation process, the Z-yarn needs to be replaced in time after 20~25 times of continuous

Tensile fracture strength of 2124Al–10vol.% SiCp composite compact tension specimens

2010 ◽  
Vol 31 (6) ◽  
pp. 2987-2993 ◽  
Author(s):  
T. Parameshwaranpillai ◽  
P.R. Lakshminarayanan ◽  
B. Nageswara Rao
Keyword(s):  
Fracture Strength ◽  
Compact Tension ◽  
Tensile Fracture ◽  
Tensile Fracture Strength

A Study of Frictional Forces between Orthodontic Brackets and Archwires

1994 ◽  
Vol 21 (4) ◽  
pp. 349-357 ◽  
Author(s):  
Alison Downing ◽  
John McCabe ◽  
Peter Gordon
Keyword(s):  
Stainless Steel ◽  
Frictional Force ◽  
Nickel Titanium ◽  
The Other ◽  
Friction Testing ◽  
Beta Titanium ◽  
Polycrystalline Ceramic ◽  
Ceramic Brackets ◽  
Frictional Forces ◽  
Testing Assembly

The differences in magnitude of static and kinetic frictional forces generated by 0·022 × 0·030-inch stainless steel (Dentaurum®) and polycrystalline ceramic (Transcend®) brackets in combinntion with archwires of different sizes (0·018 inch and 0·019 × 0·025 inch) and materials (stainless steel, nickel-titanium, and beta-titanium) at a constant ligature force were investigated. A friction-testing assembly using the Instron machine was used. In all cases, the static frictional force was greater than the kinetic frictional force. There were no significant differences in the frictional forces generated by stainless steel and polycrystalline ceramic brackets. Beta-titanium archwires produced greater frictinal forces than the other two materials. Increasing the archwire diameter increased the frictional force.

Peristaltic Flow of a Jeffery Fluid with Heat Transfer in an Inclined Porous Tube under the Influence of Slip and Variable Viscosity

2019 ◽  
Vol 393 ◽  
pp. 16-30 ◽  
Author(s):  
Gudekote Manjunatha ◽  
Hanumesh Vaidya ◽  
Choudhari Rajashekhar ◽  
K.V. Prasad
Keyword(s):  
Heat Transfer ◽  
Frictional Force ◽  
Variable Viscosity ◽  
Pressure Rise ◽  
Velocity Slip ◽  
Slip Parameter ◽  
Porous Tube ◽  
Closed Form Solutions ◽  
Long Wavelength ◽  
Frictional Forces

The present paper investigates the role of heat transfer on peristaltic transport of Jeffery liquid in a porous tube. The effect of variable viscosity and slip impacts are taken into account. The closed-form solutions are obtained with the help of long wavelength and small Reynolds number. The results of physiological parameters on velocity, pressure rise, frictional force, trapped bolus, and temperature are plotted graphically. It is seen that the pressure rise and the frictional forces decline with an expansion in the viscosity parameter. The study further demonstrates that an increase in the value of the slip parameter significantly alters the pressure rise, frictional force, and temperature. Moreover, the volume of trapped bolus increases with an increase in the value of the velocity slip parameter.

Effects of Tip Compliance in Friction Force Microscopy

2005 ◽  
Author(s):  
William G. Conley ◽  
Arvind Raman ◽  
Charles M. Krousgrill
Keyword(s):  
Friction Force ◽  
Frictional Force ◽  
Friction Force Microscopy ◽  
Stick Slip ◽  
Force Microscopy

Friction force microscopy (FFM) enables the unprecedented measurement of friction at the nanoscale. It is known that when FFM microcantilevers are dragged across surface, the nanometer tip executes stick-slip motions as the tip “plucks” individual atoms on the surface. Tomlinson’s model is usually used to explain these effects. In what follows we investigate the effects of tip compliance on the stick-slip motions in FFM. New results are predicted describing the transition from steady sliding to single and multiple atom stick-slip. Additionally, the effect of these different motions on the average frictional force is calculated.

scholarly journals Assessment of Stickiness with Pressure Distribution Sensor Using Offset Magnetic Force

Micromachines ◽  
2019 ◽  
Vol 10 (10) ◽  
pp. 652 ◽  
Author(s):  
Takayuki Kameoka ◽  
Akifumi Takahashi ◽  
Vibol Yem ◽  
Hiroyuki Kajimoto ◽  
Kohei Matsumori ◽  
...  
Keyword(s):  
Virtual Reality ◽  
Pressure Distribution ◽  
Magnetic Force ◽  
Tensile Force ◽  
Human Computer Interactions ◽  
Research Attention ◽  
Measuring Device ◽  
Measurement Results ◽  
The Difference ◽  
Intense Research

The quantification of stickiness experienced upon touching a sticky or adhesive substance has attracted intense research attention, particularly for application to haptics, virtual reality, and human–computer interactions. Here, we develop and evaluate a device that quantifies the feeling of stickiness experienced upon touching an adhesive substance. Keeping in mind that a typical pressure distribution sensor can only measure a pressing force, but not a tensile force, in our setup, we apply an offset pressure to a pressure distribution sensor and measure the tensile force generated by an adhesive substance as the difference from the offset pressure. We propose a method of using a magnetic force to generate the offset pressure and develop a measuring device using a magnet that attracts magnetic pin arrays and pin magnets; the feasibility of the method is verified with a first prototype. We develop a second prototype that overcomes the noise problems of the first, arising from the misalignment of the pins owing to the bending of the magnetic force lines at the sensor edges. We also obtain measurement results for actual samples and standard viscosity liquids. Our findings indicate the feasibility of our setup as a suitable device for measuring stickiness.

scholarly journals A hierarchical bayesian dust SED model and its application to the nearby universe

2019 ◽  
Vol 15 (S341) ◽  
pp. 138-142
Author(s):  
Frédéric Galliano
Keyword(s):  
Spectral Energy Distribution ◽  
Distribution Model ◽  
Spectral Energy ◽  
Nearby Galaxy ◽  
Hierarchical Bayesian ◽  
Galaxy Sample ◽  
Hierarchical Bayesian Method ◽  
The One ◽  
Dust Evolution ◽  
Gas Ratio

AbstractIn this paper, I review several dust evolution studies based on the DustPedia nearby galaxy sample. I first present the dust spectral energy distribution model, implementing a hierarchical Bayesian method, that we have developed. I then discuss the dust evolution trends we have derived among (integrated) and within (resolved) galaxies. In particular, we show that the trend of dust-to-gas ratio with metallicity is clearly non-linear, indicating the need for grain growth in the interstellar medium. Our trend is closer to the one derived with damped Lyα systems than what was suggested by previous studies. We finally demonstrate the universal processing of small amorphous carbon grains by stellar photons.

A STUDY OF THE INFLUENCE OF FRICTION FORCES ON THE TRANSMISSION OF SOIL VIBRATION ON GAS PIPELINES

Tribologia ◽  
2017 ◽  
Vol 272 (2) ◽  
pp. 49-58 ◽  
Author(s):  
Wacław GAWĘDZKI ◽  
Jerzy TARNOWSKI
Keyword(s):  
Friction Force ◽  
Field Experiments ◽  
Tensile Force ◽  
Variable Parameter ◽  
Gas Pipeline ◽  
Vibration Acceleration ◽  
Friction Forces ◽  
Acceleration Signal ◽  
Acceleration Signals ◽  
Pipe Vibration

The article presents the influence of friction force values during the contact of a gas pipeline with sand pack on the transmission of soil vibrations on a tested pipe section. Field experiments were carried out on standard gas pipeline insulations subjected to dynamic interactions. The load sources comprised artificially generated soil vibrations with an impulsive character. Within the course of experiments, soil and pipe vibration acceleration signals were registered for different values of friction forces in its contact with the soil. The value of friction forces being a variable parameter during experiments were applied by the change of values of the tension static force of the gas pipeline section. The analysis of the registered soil and pipe vibration acceleration signals were conducted based on the time-domain signal decomposition method, Hilbert-Huang Transform (HHT). This method enables one to decompose the non-stationary vibration acceleration signal into narrowband components. For each component, a course of instantaneous values for frequency and amplitude was specified. The dependence of the pipe vibration acceleration amplitude on the pipe tensile force and friction force of the pipe in the contact with the soil was demonstrated.

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