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Online since: May 2013
Authors: Sean K. Powell, Suzanne M. Mithieux, Anthony S. Weiss, Konstantin I. Momot
Discussion MR properties of water in hydrated biomaterials and tissues can be approximated by the model involving dynamic equilibrium between two distinct pools, “free” and “bound” water [5,6].
Water in the free pool has molecular hydrodynamic properties similar to those of bulk water and possesses a rotational correlation time ~10 ps.
The two-site exchange model shows that the water-proton spin relaxation rates are determined by several factors.
It may be that the intrinsic bound relaxation rates, R1B and R2B, are themselves affected by compression.
By distinguishing between these two models, mMRI would provide valuable insights into the macromolecular basis of the biomechanical properties of elastin networks.
Online since: June 2010
Authors: T. Manzoor, E. Ahmad, M. Sarwar
Duplex stainless steels have become renowned for its excellent properties such as, high strength, toughness and resistance to corrosion [3].
These steels are widely used in petroleum, petrochemical industry due to its good properties, which make them economically competitive with other types of stainless steels and carbon steels in offshore, oil and gas industry.
The controlling factor for cracking of DSS is ferrite phase yielding since ferrite is harder than the austenite phase.
Hydrogen may affect the critical tensile stress σf for crack propagation.
Devine, "Influence of Microstructure on the Mechanical Properties and Localized Corrosion of Duplex Steel in ASTM-5, PP 672, ASTM, Philadephia
Online since: March 2007
Authors: Kanryu Inoue, Gon Seung Yang, Jong Kook Lee, Woo Yang Jang, Soon Jong Jeong
Effect of Aging and Microstructure on Mechanical Rolling CuAlNi Shape Memory Alloy G.S.
Introduction Shape memory effect is called as the property to recover the original shape from deformed one by heat treatment above critical temperature.
Therefore, in order to apply to mechanical and thermal materials, it is important to obtain the experimental data for a transformation under the loading, and physical properties, and slip resistant for repeated thermal cycling.
Another factor is the decrease of Al concentration by the change of β1 F+ γ1 F Phase, and the increase of orderness during a long time aging.
Also, they affected in the formation of G.P zone and transformation temperature in company with γ2 phase formed by θ F to θ at grain boundary.
Online since: November 2015
Authors: Peter Sivák, Oskar Ostertag
The solved problem and the object of performed analyses The technical issue solved in this paper is the investigation of the effects and the factors that led to permanent plastic deformation and occurrence of cracking in the structure of the locomotive, the excessive deterioration of the axle gripping, the drive mechanisms and the braking systems of the shunting locomotive.
Later, it turned out, that the used drive systems, braking and wagon interconnection significantly affected the movement of the whole set and were one of the major sources of potential problems.
They represented significant technical risk factors causing progressive damage of observed critical elements of the locomotive and the source of the technical problems that have arisen.
The determining fact was the knowledge that under experimental measurements it was not possible to perform a deeper analysis of the effects of the particular parameters on the dynamic properties of the system such as: · size of braking force, · clearance in the couplers, · train set speed before braking and others.
This will cause the decrease of shocks and shift at mechanical braking.
Online since: November 2012
Authors: Jin Hua Zhang
Introduction The vibration mill is the key equipment in the process of making super-powder, the product that satisfy the property of granularity can be acquired after grinding.
But fuzzy controller over-relied on the experiments of experts in the field, the subjective factor is the main factors.
In the traditional production craft, the powder doesn’t meet technical requirements is sent to vibration mill again, and main motor speed keep constant, thus it will affect the production efficiency.
Because of subjective factor playing a main role, so this kind of design method is empirical, even rough.
In this paper, the fuzzy controller is taken, but it is over-relied on the experiments of experts in the field, the subjective factor is the main factors.
Online since: June 2012
Authors: Xiao Ping Hu, Sen Yan Chen, Zhi Chuang Zhang
Poor applicability of traditional processing technology, difficult to process and high processing costs affect the overall growth of the using of Nomex honeycomb material [4].
With the Nomex honeycomb composite material properties, this paper proposed the NC cutting method based on ultrasonic vibration, analyzed the curved surface forming principle and established an error analysis model.
The basic principle of ultrasonic cutting is to use an electronic ultrasonic generator, which first creates an ultrasound with the frequency 20~30kHz, then the ultrasonic-mechanical converter placed inside the ultrasonic cutting head converts the ultrasonic vibration with weak amplitude and energy into mechanical vibration of same frequency, and the resonance amplifier gets amplitude and energy that is strong enough and can meet the requirements of cutting parts, finally transfers to the cutting tool placed on the top of the ultrasonic cutting head for the cutting process of composite material.
Tool path generation is by the parts geometry model, to calculate the tool position and produce processing trajectory, according to the selected cutting machine, cutting tool, feed method, mechanical allowance and other factors.
Hong Soon H:Mechanical behavior and failure process during compressive of honeycomb composite at elevated temperatures.
Online since: May 2011
Authors: Feng Shan Ma, Jie Guo, Hai Jun Zhao
Introduction Joints are the main influencing factor for the deformation, failure and instability of surrounding rocks.
Currently, few attempts have been done on the stability of tunnels affected by joint sets with different orientations and overburden pressures.
Without original state of strain energy, this elastic body is considered as an optimal material to simulate the actual behaviours of physical and mechanical properties of a geological body after diagenesis.
Studies shown the main cause of the deformation and failure of the tunnels are the mechanical performance of the shear slip and deformation of joints due to excavation and the overburden pressure.
Its mechanical essences are the continued deformation and the repeated failure of joints in varied stress field caused by excavation and overburden pressures.
Online since: February 2019
Authors: Anamul Hossain, Dong Bin Wei, Mandeep Singh
Mostly these both factors (dimension and grain size) consider together for deep understanding.
All the models [5] directly added dimensions factors like T and D to conventional constitutive model to fit their experimental data.
Sample 1 Sample 2 Sample 3 Material Copper Copper Copper Thickness 50 μm 50 μm 50 μm Time 5 min 10 min 20 min Temperature 700 700 700 Microstructure Average grain size 19 μm 31 μm 40 μm T/D 2.6 1.6 1.3 Fig. 1. 3D laser scanning microscope. 2.2 Micro tensile test The micro tensile tests were performed to investigate the mechanical properties of the prepared specimen, which are equipped with different T/D ratios.
To express the fraction of inner portion to the complete material area the size factor Ƞ is employed.
Yang, Experimental studies of the size effect affected microscale plastic deformation in micro upsetting process, Materials Science and Engineering: A. 534 (2012), 374-383
Online since: June 2025
Authors: M. Isya, Sri Aprilia, Meidia Refiyanni, Sofyan M. Saleh, Ichvan Fadil
The study began with testing the physical properties of aggregates and asphalt, both conventional and modified.
After testing the physical properties, the next step was determining the optimum asphalt content.
The R² value of 0.835 indicates that 83.52% of the variation is explained by the model, with the remaining 16.48% attributed to factors related to the modification of the asphalt used [24].
Kang, “Mechanical Properties of Porous Asphalt Mixtures Containing Styrene-Butadiene-Styrene and High-Viscosity Modifiers,” J.
Setyawan, “Design and properties of hot mixture porous asphalt for semi-flexible pavement applications,” J.
Online since: October 2014
Authors: Ángel Linares-Solano, Mirko Kunowsky, Juan Pablo Marco-Lozar
Thus, the packing density of the adsorbent affects directly the excess adsorption on a volumetric basis.
The mold was installed in a mechanical press.
All of them have mechanical stability and can be well managed.
It has been well proved [15,26] that, depending on the adsorption temperature and on the pressure used, the hydrogen uptake depends on the sample properties (i.e., the micropore volume (also the apparent BET surface area) or the narrow-micropore volume).
Furthermore, if the density of the sample used is different from the packing density or the monolith density, the results will be affected.
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