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Online since: July 2007
Authors: Leo A.I. Kestens, Kim Verbeken
Introduction Changing the deformation and annealing parameters affects many structure sensitive material properties like the electrical, mechanical and magnetic properties.
Cold rolling is often the final step of the entire rolling process, where the final thickness is obtained and which generates the greatest impact on the final properties of the sheet.
The question that will be investigated is whether or not the rolling reduction will affect the prevailing recrystallization mechanism.
These spreads are independent of the Taylor factors of the grains and therefore appear to be determined by the requirements of strain compatibility near grain boundaries and not by the crystallographic orientation of the grain. [14, 15] After a rolling reduction of 60%, the strain heterogeneities of the deformed microstructure were much better developed.
Here, it was found, by contrast, that the nucleation stage of secondary recrystallization in ULC steel has very specific and important properties.
Online since: September 2013
Authors: Carmen Rodríguez-Liñán, M. Jesús Morales-Conde, Paloma Rubio de Hita
In a second stage, a representative sample of the affected area was analyzed and thoroughly evaluated.
This radiation, defined by the Stefan-Boltzmann law [17], is proportional to body temperature and the thermal properties of the material.
Ultrasonics is based on the acoustic properties of the material.
Sound wood: From the dynamic elasticity modulus (Ed) a correlation (eq. 3) with elastic properties determined by bending tests (MOE) is obtained.
“Timber in buildings: Estimation of some properties using Pilodyn® and Resistograph®” Proceedings of the XII DBMC, International Conference on Durability of Building Materials and Components, Porto, Portugal, April 2011
Online since: October 2014
Authors: Aristotel Popescu, Ovidiu Virgil Stadoleanu, Ana Georgiana Lupu, David Pfund, Abel Hernandez-Guerrero, Ema Carmen Panaite
Improved Heat Transfer using Micro-structures in Trifold Solar Energy Conversion Systems POPESCU Aristotel1,a*, PFUND David2,b, HERNANDEZ-GUERRERO Abel3,c, PANAITE Ema-Carmen1,d, LUPU Ana Georgiana1,e and STADOLEANU Ovidiu-Virgil1,f 1”Gheorghe Asachi” Technical University of Iaşi, Faculty of Mechanical Engineering, Bd.
Introduction The ever-rising global trend of renewable energy options usage was affected by the recent economic crisis, but remained on an increasing curve, mainly due to developments and investments on Asian markets [1].
The combination of these two factors alone, would provide enough incentives to apply micro-scale heat exchanger technology to hybrid trifold solar panels.
The conditions assumed for analysis of both channel configurations were: steady state, negligible radiation heat transfer and constant properties.
For smaller size channels, the minor increase relative to theoretical values may be due to the more realistic situation where fluid properties are temperature dependent.
Online since: April 2012
Authors: Jian Min Zeng, Zhi Liu Hu, Chen Liu
Introduction Impurities such as non metallic inclusions and hydrogen in the aluminum adversely affect the mechanical, physical and chemical properties of aluminum castings, such as the strengths, electrical and thermal conductivities and corrosion resistance, and so on.
It is dispersedly distributed in the melt and usually of small size (from less than 1 to hundreds of micron and of flocculent structures), which is extremely harmful to the properties of the materials, especially elongation and fatigue performance.
A, Chemical and kinetic factors related to hydrogen removal from aluminum, Metall.
Online since: October 2014
Authors: Jian Can Hu, Li Ming Zhang, Min Xiao
Because of their high water content and excellent hydrophilic properties, hydrogels have been widely utilized in tissue engineering, pharmaceuticals, food, personal care products and drug delivery [2].
In this study, cellulose was added to reinforce the hydrogel structure on the grounds that the chains of cellulose are very stiff and act as a backbone to improve the mechanical strength of the hydrogel.
Figure 4 Swelling ratios of the hydrogels in 9g/L NaCl solution The swelling behavior of cellulose-CMC hydrogels in physical saline water is one of the important factors that will affect the application of hydrogels as biomaterials.
Characterization and properties of carboxymethyl cellulose hydrogels crosslinked by polyethylene glycol.
Online since: October 2011
Authors: Xiang Ji, Guang Ying Ran
Therefore improving the operation ability of operational personnel in substation is the influence of the factors which influent the safe and reliable operation of power system.
In the transformer substation simulation based on component software development technology, all sorts of second equipment in accordance with their respective physical properties of the generation of their virtual equipment respectively, and by using the component technology, created virtual equipment will be packed into equipment simulation component to make software has good open and easy extensibility.
It introduced appraisal factor and geographical factor to describe the circumstances, the two factors is estimated function F (N) of parameters.
G(i):The geographical factors, used to reflect far and near of the geographical location.
So through the F(N) calculation, got an optimal path reasoning, it carries the constraints of the comprehensive consideration of the rules, appraisal factor and geographical factors, is a kind of very effective optimal ask award algorithm.
Online since: March 2007
Authors: Kotaro Kuroda, Masazumi Okido, Ryoichi Ichino
The properties for the coated samples were studied using XRD, EDX, FT-IR, and SEM.
Introduction Calcium phosphates, specifically HAp (Ca10(PO4)6(OH)2), are of interest in bone-interfacing implant applications because of their demonstrated osteoconductive properties[1].
Hydroxyapatite is considered to be a bioactive material, and is used in the fabrication of medical and dental implants, usually in the form of a coating on a metallic substrate to compensate for its poor intrinsic mechanical properties.
The properties of the coated samples were studied using X-ray diffraction (XRD), energy dispersive X-ray analysis (EDX), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM).
The surface morphology is considered to be one of the most important factors in the behavior of cells.
Online since: January 2013
Authors: Min Huang
Introduction Reinforced concrete has only a history of more than 100 years from the beginning of the 19th century up to now, although compared with the masonry structure and the steel structure, its history is not long, but as a result of continuous improvement of the concrete and steel material properties, the progress on the structure theory construction technology make its development is very rapid.
The Characteristics of the Steel Structure Performance Based on Filling Technology Reinforced concrete structure is made of two materials, and the steel and concrete are combined into a whole common mechanical engineering structure, of which the main beard component is built with reinforced concrete, reinforcement under tension and concrete under pressure.
Although the existence of crack doesn't necessarily mean that structure will be destroyed, but it affects the durability of the steel structure and beautiful.
Overview of the Ductility Performance The used variables for description of ductility include the material toughness, curvature ductility factor of the cross section, displacement ductility coefficient of the component or structural, plastic hinge rotation capacity, hysteretic curve ( as shown), energy dissipation capacity.
The Factors of Influencing Component Ductility (1)The longitudinal reinforcement ratio Experiments show that when the beam of longitudinal tensile reinforcement ratio is very high, and the moment when the maximum is reached, the curvature curve of the bending moment soon decline; When the reinforcement ratio is low, the moment after reaching the maximum can be maintained for a long horizontal section, thus greatly improving the ductility and energy dissipation capacity.
Online since: April 2018
Authors: Tetsuo Oya, Shin Onoshima
Multiscale modeling is a model that relates the mechanical characteristics between microscopic and macroscopic scale.
Material properties of the test sheet metal.
However, considering the effect of uncertainty factors, such as crystal lattice defects and non-uniform thermal effect induced by the heat treatment process, it is possible to assume that work-hardening laws on each slip system differs slightly.
M0 is Taylor’s factor and usually set to 3.07.
In elastic region, however, work-hardening expression, n-power law in this analysis, affected the form of the curve.
Online since: July 2015
Authors: Yue Ming Li, Qian Geng, Wei Li
Theoretical Analyses of Vibration and Sound Radiation Responses of Heated Symmetric Laminated Plates in Pre- and Post-Buckling Ranges Wei Li, Qian Geng and Yue Ming Li a * State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Jiaotong University, Xi’an, 710049, People’s Republic of China a liyueming@mail.xjtu.edu.cn Keywords: Laminated plate, Dynamic response, Thermal buckling.
Thickness of the facing layers is 2 mm, and material properties are Young’s modulus 210 GPa, Poisson’s ratio 0.27, mass density 7850 kg/m3, and thermal expansion coefficient 10-5 K-1.
All the material properties are considered to be temperature independent. 0 oC is defined as the reference temperature which represents the state without thermal influence.
Affected by the two effects, the increment of frequency suggests that the stiffening effect of thermal load plays the leading role.
Thermal environment performs as two opposite factors before and after buckling.
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