scholarly journals Evaluation of mechanical properties of nanoparticles using a constant-volume shear tester

2020 ◽  
Vol 31 (3) ◽  
pp. 1007-1012
Author(s):  
Yasuhiro Shimada ◽  
Kai Yamamura ◽  
Shuji Matsusaka
Keyword(s):  
Mechanical Properties ◽  
Constant Volume ◽  
Shear Tester

Precision of Shear Tests in Evaluating Asphalt Mixtures

2003 ◽  
Vol 1832 (1) ◽  
pp. 155-160 ◽  
Author(s):  
R. Michael Anderson ◽  
Richard K. Steger ◽  
Gerald A. Huber ◽  
Pedro Romero
Keyword(s):  
Mechanical Properties ◽  
Hot Mix Asphalt ◽  
Shear Stiffness ◽  
Asphalt Mixtures ◽  
Shear Tests ◽  
Frequency Sweep ◽  
Constant Height ◽  
Repeated Load ◽  
Shear Tester ◽  
Highway Research

Various methods exist to measure the mechanical properties of hot-mix asphalt (HMA). To be useful such a test not only must measure a property that controls performance but also must be repeatable. The Strategic Highway Research Program developed tests with the Superpave® shear tester that have been shown to be related to HMA performance. To date, repeatability has not been quantified. The results of a repeatability study for the measurement of shear stiffness (frequency sweep) and of permanent shear strain (repeated-load, constant-height testing) are reported.

scholarly journals A new method for evaluating powder flowability using constant-volume shear tester,

2018 ◽  
Vol 29 (12) ◽  
pp. 3577-3583 ◽  
Author(s):  
Yasuhiro Shimada ◽  
Shigenobu Hatano ◽  
Shuji Matsusaka
Keyword(s):  
Constant Volume ◽  
New Method ◽  
Powder Flowability ◽  
Shear Tester

scholarly journals Mechanical properties of native maize, wheat, and potato starches

2013 ◽  
Vol 31 (No. 4) ◽  
pp. 347-354 ◽  
Author(s):  
M. Stasiak ◽  
M. Molenda ◽  
I. Opaliński ◽  
W. Błaszczak
Keyword(s):  
Mechanical Properties ◽  
Moisture Content ◽  
Mechanical Behaviour ◽  
Potato Starch ◽  
Uniaxial Compression Test ◽  
Strength Parameters ◽  
Ring Shear ◽  
Potato Starches ◽  
Particle Sizer ◽  
Shear Tester

The interrelations between moisture content and mechanical properties of dry and wet native starches of wheat, maize, and potato were investigated. Strength parameters of powders were tested using direct shear and ring shear tester. Carr indices and associated parameters were determined using a Hosokawa Powder Tester. Particle size distribution of powder was analysed using an Infrared Particle Sizer. Uniaxial compression test was conducted to determine the reaction of powder in a cylindrical probe to vertical load. Mechanical behaviour of the material was found to be changing with increasing moisture content. Mechanical behaviour of potato starch was found to be different from that of cereal starches, which may require different utilisation in some processes.  

scholarly journals A New Method for Evaluating Powder Flowability Using Constant Volume Shear Tester

2017 ◽  
Vol 54 (2) ◽  
pp. 90-96 ◽  
Author(s):  
Yasuhiro Shimada ◽  
Shigenobu Hatano ◽  
Shuji Matsusaka
Keyword(s):  
Constant Volume ◽  
New Method ◽  
Powder Flowability ◽  
Shear Tester

scholarly journals Estimating the unconfined yield strength of coal in the case of longwall coal mining with hanging wall top caving

2016 ◽  
Vol 63 (2) ◽  
pp. 73-80
Author(s):  
Damjan Hann
Keyword(s):  
Mechanical Properties ◽  
Yield Strength ◽  
Coal Mining ◽  
Bulk Material ◽  
Hanging Wall ◽  
Measured Data ◽  
Innovative Approach ◽  
Bulk Materials ◽  
Longwall Coal Mining ◽  
Shear Tester

Abstract This study presents an innovative approach for determining the unconfined yield strength σc during the excavation of coal from the earth’s crust by using an equipment that was developed for measuring the mechanical properties of bulk materials stored in silos. Highly productive excavation of coal with a hanging wall top caving leads to intensive deformations in the hanging wall and the broken coal can be considered as bulk material. In this research, the shear tester Johanson Hang-Up Indicizer was used to measure the unconfined yield strength of the tested samples, even though such a tester cannot produce stress-strain conditions similar to those occurring during the excavation. An attempt was made to estimate the real unconfined yield strength of broken coal deep under the surface through a combination of measured data and extrapolation.

Superpave® Laboratory Compaction Versus Field Compaction

2003 ◽  
Vol 1832 (1) ◽  
pp. 201-208 ◽  
Author(s):  
Robert L. Peterson ◽  
Kamyar C. Mahboub ◽  
R. Michael Anderson ◽  
Eyad Masad ◽  
Laith Tashman
Keyword(s):  
Mechanical Properties ◽  
Design Process ◽  
Mix Design ◽  
Air Voids ◽  
Superpave Gyratory Compactor ◽  
Asphalt Mix ◽  
Field Compaction ◽  
Shear Tester

Laboratory compaction is an important part of asphalt mix design. For the mix design process to be effective, laboratory compaction must adequately simulate field compaction. In this study mechanical properties measured with the Superpave® shear tester were used to evaluate field compaction and laboratory compaction. The field compaction consisted of three test sections with different compaction patterns. The laboratory compaction used the Superpave gyratory compactor with adjustments to several parameters. Results of this study indicate that current gyratory protocol produces specimens with significantly different mechanical properties than those of field cores produced with the same material and compacted to the same air voids. Results also show that adjustments to certain parameters of the gyratory can produce specimens that better simulate the mechanical properties of pavement cores.

Phase Transformations in Ti-7w/oMo-3w/oMe Alloy

1974 ◽  
Vol 32 ◽  
pp. 514-515
Author(s):  
S. Fujishiro
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Transmission Electron Microscopy ◽  
Tensile Strength ◽  
Mechanical Processing ◽  
Ray Method ◽  
X Ray ◽  
Transmission Electron ◽  
Water Quench ◽  
Alpha Beta

The mechanical properties of three titanium alloys (Ti-7Mo-3Al, Ti-7Mo- 3Cu and Ti-7Mo-3Ta) were evaluated as function of: 1) Solutionizing in the beta field and aging, 2) Thermal Mechanical Processing in the beta field and aging, 3) Solutionizing in the alpha + beta field and aging. The samples were isothermally aged in the temperature range 300° to 700*C for 4 to 24 hours, followed by a water quench. Transmission electron microscopy and X-ray method were used to identify the phase formed. All three alloys solutionized at 1050°C (beta field) transformed to martensitic alpha (alpha prime) upon being water quenched. Despite this heavily strained alpha prime, which is characterized by microtwins the tensile strength of the as-quenched alloys is relatively low and the elongation is as high as 30%.

Effects of cooling rate on the mechanical properties of dual phase treated vanadium steels

1983 ◽  
Vol 41 ◽  
pp. 220-221
Author(s):  
L.J. Chen ◽  
H.C. Cheng ◽  
J.R. Gong ◽  
J.G. Yang
Keyword(s):  
Mechanical Properties ◽  
Cooling Rate ◽  
Automobile Industry ◽  
High Strength ◽  
Weight Percent ◽  
Low Alloy Steels ◽  
Dual Phase ◽  
Resource Requirement ◽  
Alloy Steels ◽  
Potential Weight

For fuel savings as well as energy and resource requirement, high strength low alloy steels (HSLA) are of particular interest to automobile industry because of the potential weight reduction which can be achieved by using thinner section of these steels to carry the same load and thus to improve the fuel mileage. Dual phase treatment has been utilized to obtain superior strength and ductility combinations compared to the HSLA of identical composition. Recently, cooling rate following heat treatment was found to be important to the tensile properties of the dual phase steels. In this paper, we report the results of the investigation of cooling rate on the microstructures and mechanical properties of several vanadium HSLA steels.The steels with composition (in weight percent) listed below were supplied by China Steel Corporation: 1. low V steel (0.11C, 0.65Si, 1.63Mn, 0.015P, 0.008S, 0.084Aℓ, 0.004V), 2. 0.059V steel (0.13C, 0.62S1, 1.59Mn, 0.012P, 0.008S, 0.065Aℓ, 0.059V), 3. 0.10V steel (0.11C, 0.58Si, 1.58Mn, 0.017P, 0.008S, 0.068Aℓ, 0.10V).

Lattice Imaging of Grain Boundaries in Ceramics

1977 ◽  
Vol 35 ◽  
pp. 114-115
Author(s):  
D. R. Clarke ◽  
G. Thomas
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Silicon Nitride ◽  
Grain Boundaries ◽  
High Temperature Strength ◽  
Current Interest ◽  
Lattice Imaging ◽  
Special Significance ◽  
Structural Applications ◽  
Refractory Ceramics

Grain boundaries have long held a special significance to ceramicists. In part, this has been because it has been impossible until now to actually observe the boundaries themselves. Just as important, however, is the fact that the grain boundaries and their environs have a determing influence on both the mechanisms by which powder compaction occurs during fabrication, and on the overall mechanical properties of the material. One area where the grain boundary plays a particularly important role is in the high temperature strength of hot-pressed ceramics. This is a subject of current interest as extensive efforts are being made to develop ceramics, such as silicon nitride alloys, for high temperature structural applications. In this presentation we describe how the techniques of lattice fringe imaging have made it possible to study the grain boundaries in a number of refractory ceramics, and illustrate some of the findings.

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