631 Effect of Material Grain Size on Transferability in Ultrasonic Vibration Assisted Micro-Coining Process

2013 ◽  
Vol 2013.21 (0) ◽  
pp. _631-1_-_631-4_
Author(s):  
Tetsuhide SHIMIZU ◽  
Shingo KOSUGE ◽  
Ming YANG
Keyword(s):  
Grain Size ◽  
Ultrasonic Vibration ◽  
Material Grain Size

Material Grain Size Determines Relaxation-Time Distributions in Slow-Dynamics Experiments

2022 ◽  
Vol 17 (1) ◽  
Author(s):  
J. Kober ◽  
A.S. Gliozzi ◽  
M. Scalerandi ◽  
M. Tortello
Keyword(s):  
Grain Size ◽  
Relaxation Time ◽  
Slow Dynamics ◽  
Material Grain Size

Grain Refinement of LC9 Alloy by Low-Power Ultrasonic Vibration Melt Treatment

2012 ◽  
Vol 538-541 ◽  
pp. 1267-1271
Author(s):  
Le Ping Chen ◽  
Yan Yan Han ◽  
Quan Zhou
Keyword(s):  
Grain Size ◽  
Low Power ◽  
Grain Refinement ◽  
Ultrasonic Vibration ◽  
Turning Point ◽  
Treatment Temperature ◽  
Melt Treatment ◽  
Preheating Temperature ◽  
Power Ultrasonic ◽  
Treatment Changes

The influences of different preheating temperature of mold and treatment temperature on solidified structure of LC9 alloy were studied by low-power ultrasonic vibration melt-treatment. The results show that grain of LC9 alloy can be refined greatly by low-power ultrasonic vibration melt-treatment. The dendrite growth is restrained and the microstructure is changed from larger dendrite grains to dominant fine none-dendritic and globular grains. With the decrease of preheating temperature of mold, grain size decreases. The efficiency of grain refinement is better at low preheating temperature. With the increase of ultrasonic vibration temperature, grain size decreases firstly, then increases, and the turning point is 660 °C. At 640 °C, grain size of the alloy with US vibration treatment changes slightly compared with non US-treated alloy.

Influence of the Plow Filling and Thread Angle onto the Plow Head Efficiency / Wpływ Współczynnika Wypełnienia Organu Oraz Kąta Nawinięcia Płata Ślimaka Na Sprawność Ładowania Frezującymi Organami Ślimakowymi

2015 ◽  
Vol 60 (1) ◽  
pp. 143-156 ◽  
Author(s):  
Tomasz Wydro
Keyword(s):  
Grain Size ◽  
Filling Rate ◽  
Optimal Loading ◽  
Loading Efficiency ◽  
Laboratory Examinations ◽  
Material Grain Size

Abstract Laboratory examinations on the plow heads at various filling rate and material grain-size, as well as various values of worm thread angle of the plow head have been executed. Influence of the worm thread angle and plow head filling onto optimal loading efficiency, has also been tested.

Influence of Servo Motion on Forming Limit of Thin Metallic Foils Using Micro Bulge Test

2016 ◽  
Vol 716 ◽  
pp. 208-214
Author(s):  
Ryo Yamaguchi ◽  
Tetsuhide Shimizu ◽  
Ming Yang
Keyword(s):  
Grain Size ◽  
Stress Relaxation ◽  
Ultrasonic Vibration ◽  
Forming Limit ◽  
Bulge Test ◽  
Production Methods ◽  
Step Motion ◽  
Stress States ◽  
Metallic Parts ◽  
Metallic Foils

The demand of microforming is increasing as one of the economical production methods for small metallic parts. However, the formability of metallic foils decreases with decreasing ratio of thickness to grain size. In the present study, a process combining step motion and ultrasonic vibration is proposed to enhance the formability by stress relaxation. To investigate the effect of stress relaxation on forming limit of metallic foils in different stress states, micro bulge tests were carried out. The material used was brass foils with a thickness of 0.03, 0.05 and 0.08 mm. For calculating the strains of the deformed specimens, a pattern of dots with a diameter and a pitch of 50 and 60 μm was fabricated on the surface of the specimens by photolithography. The results of micro bulge tests showed that the forming limit increases by the stress relaxation regardless of stress states, except for the foil with a thickness of 0.03 mm. The possibility of enhancing the formability of metallic foils by stress relaxation was experimentally demonstrated.

Monitoring material grain size by laser‐generated ultrasound

1991 ◽  
Vol 59 (27) ◽  
pp. 3530-3532 ◽  
Author(s):  
A. Aharoni ◽  
M. Tur ◽  
K. M. Jassby
Keyword(s):  
Grain Size ◽  
Material Grain Size

scholarly journals Effect of Roughness on Discharge

2013 ◽  
Vol 4 (3) ◽  
pp. 29-33 ◽  
Author(s):  
T.W. Lau ◽  
N.R. Afshar
Keyword(s):  
Grain Size ◽  
Flow Rate ◽  
Roughness Coefficient ◽  
Coefficient Increase ◽  
Different Types ◽  
Channel Slope ◽  
Experimental Works ◽  
Bed Roughness ◽  
Material Grain Size ◽  
Effect Of Surface

These Water resource projects and hydraulic engineering works have been developing rapidly throughout the world, thus prediction of water roughness coefficient is becoming an importance criteria for the designs of hydraulic related structure like open channel, and dam structure. The purposes of this research are to determine the effect of roughness on discharge and study on the factors that affect roughness coefficient. The roughness coefficient for this study is expressed in terms of Manning’s n. Experimental works were carried out to study the effect of roughness by using flumes (8m x 0.3m x 0.4m) with different types of roughened bed such as 2mm grain size plate and 5mm grain size plate. The experiments were being tested with various flow rates for slope equal to 1:300, 1:600 and 1:900 to determine the effect of slope on roughness coefficient. The results of the experimental study were presented and shown that the effect of surface roughness, material grain size, channel slope, and Manning’s roughness coefficient on flow rate. For the range of conditions tested, the discharge was found to be decreased as roughness coefficient increase. From the experiments, it shows smoother surface is having lower roughness coefficient and less retarding effect on the water flow, higher flow rate is produced. As conclusion, flow rate and roughness coefficient were influenced by bed roughness and slope.

Elimination of membrane compliance in undrained triaxial testing. I. Measurement and evaluation

1993 ◽  
Vol 30 (5) ◽  
pp. 727-738 ◽  
Author(s):  
P.G. Nicholson ◽  
R.B. Seed ◽  
H.A. Anwar
Keyword(s):  
Grain Size ◽  
Test Results ◽  
Factors Affecting ◽  
Grain Sizes ◽  
Wide Range ◽  
Specimen Density ◽  
Thin Membranes ◽  
Alternative Approaches ◽  
Measurement And Evaluation ◽  
Material Grain Size

Several alternative approaches have been suggested for evaluation and correction of the testing errors caused by membrane compliance. The degree to which membrane compliance may affect the results of an undrained test is a function of the soil grain size and overall geometry of the test specimen, as well as specimen density and range of effective confining stresses during a given test. Membrane-compliance effects may be negligible for fine sands and silts tested in conventional 71 mm diameter samples, since even very thin membranes cannot penetrate significantly into the small surficial voids. For medium to coarse sands and gravels, however, membrane-compliance effects may have a significant influence on test results. The scope of this paper is threefold: firstly, to review, examine, and evaluate the variety of methods to measure and characterize membrane compliance; secondly, to develop an improved understanding of the factors affecting membrane compliance; and thirdly, to provide an enhanced, updated, and expanded correlation for estimating membrane compliance characteristics as a function of material grain size for a range of soil types, including a wide range of gradation types and representative grain sizes from silts through gravels. Key words : membrane, penetration, compliance, undrained testing, triaxial, measurement, evaluation.

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