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Online since: April 2013
Authors: Muchtar Andanastuti, Kok Fong Lim, Chou Yong Tan, Rusnah Mustaffa
In the development of a ceramic composite, the sintering and processing methods can significantly affect the mechanical properties of the composite.
The sintering and processing methods significantly affect the mechanical properties, phase stability, and aesthetic appearance of the composites, which has drawn the attention of a number of researchers.
Figure 2 Comparison of mechanical properties of Pure HA and HA/YSZ composite [14] However, a high temperature is required to densify the composites to obtain the desired mechanical properties.
HIP also improves the workability and mechanical properties of the material.
Zhang, Thermal decomposition and mechanical properties of hydroxyapatite ceramic.
The sintering and processing methods significantly affect the mechanical properties, phase stability, and aesthetic appearance of the composites, which has drawn the attention of a number of researchers.
Figure 2 Comparison of mechanical properties of Pure HA and HA/YSZ composite [14] However, a high temperature is required to densify the composites to obtain the desired mechanical properties.
HIP also improves the workability and mechanical properties of the material.
Zhang, Thermal decomposition and mechanical properties of hydroxyapatite ceramic.
Online since: October 2014
Authors: Xiao Hai Li, De Sheng Xu
An in depth understanding of the mechanical properties of pharmaceutical materials is crucial when attempting to predict compaction behavior as well as the final properties and quality of the compact [4].
In tablet compaction Canonical Correlation Analysis can be employed to examine the relation between processing factors or material properties and mechanical performance [62, 63].
In Bohidar’s paper, material properties (X variables) and mechanical performances (Y variables) were studied by Canonical Correlation Analysis.
This shows that these three variables can also serve as important material properties controlling the mechanical performances of MCC.
It should be emphasized that many factors must be considered when investigating compaction characteristics of powder blends.
In tablet compaction Canonical Correlation Analysis can be employed to examine the relation between processing factors or material properties and mechanical performance [62, 63].
In Bohidar’s paper, material properties (X variables) and mechanical performances (Y variables) were studied by Canonical Correlation Analysis.
This shows that these three variables can also serve as important material properties controlling the mechanical performances of MCC.
It should be emphasized that many factors must be considered when investigating compaction characteristics of powder blends.
Online since: December 2013
Authors: Soňa Leitnerová, Dušan Jankovič, Juraj Olbřímek
It is important to remember properties of the individual components of a structural element and subsequent interaction during a fire.
Fig.2 Dependences of charring Reaction to fire classification and other no standardized material properties Element of building construction type D2 has every combustible components and product hidden under non-combustible cover and so this element doesn´t increase intensity of fire.
If would be used glued joints with having properly selected properties.
When filled with combustible material it can lose it is properties before the time the covering is destroyed.
Summary There are many factors affecting preterm failure of timber frame constructions.
Fig.2 Dependences of charring Reaction to fire classification and other no standardized material properties Element of building construction type D2 has every combustible components and product hidden under non-combustible cover and so this element doesn´t increase intensity of fire.
If would be used glued joints with having properly selected properties.
When filled with combustible material it can lose it is properties before the time the covering is destroyed.
Summary There are many factors affecting preterm failure of timber frame constructions.
Online since: December 2012
Authors: Carlos José de Araújo, Antônio Gilson Barbosa de Lima, Suédina Maria L. Silva, Artur S.C. Leal
The thermal behavior of epoxy systems depends on a number of factors such as components used, mixing, curing conditions, and treatment of post-cure.
The results, sometimes divergent, for the thermomechanical properties of nanocomposites, are due to the fact that these properties are affected not only by the structure of nanocomposite, but by many other factors, such as the crosslinking density, charge-matrix adhesion and reaction kinetics and the method of determination [8].
Characterization and Properties Dynamic mechanical properties of samples were measured with a TA Q800 dynamical mechanical analyzer (DMA) in fixed frequency mode at 1 Hz with 15 μm oscillation amplitude, and from 30 to 180 °C at 5°C/min loaded under single cantilever mode.
Kotaki, Preparation, microstructure and thermal mechanical properties of epoxy/crude clay nanocomposites, Appl.
Ninan, Thermoplastic toughened layered silicate epoxy ternary nanocomposites-preparation, morphology, and thermomechanical properties, Polym.
The results, sometimes divergent, for the thermomechanical properties of nanocomposites, are due to the fact that these properties are affected not only by the structure of nanocomposite, but by many other factors, such as the crosslinking density, charge-matrix adhesion and reaction kinetics and the method of determination [8].
Characterization and Properties Dynamic mechanical properties of samples were measured with a TA Q800 dynamical mechanical analyzer (DMA) in fixed frequency mode at 1 Hz with 15 μm oscillation amplitude, and from 30 to 180 °C at 5°C/min loaded under single cantilever mode.
Kotaki, Preparation, microstructure and thermal mechanical properties of epoxy/crude clay nanocomposites, Appl.
Ninan, Thermoplastic toughened layered silicate epoxy ternary nanocomposites-preparation, morphology, and thermomechanical properties, Polym.
Online since: January 2013
Authors: Vasiliy D. Buchelnikov, Sergey Taskaev, Dmitry Bataev, Akhmed Aliev, Vladimir Khovaylo, Anatoliy Pellenen, Konstantin Skokov
And one of the possible ways of engineering magnetocaloric (MCE) materials is tightly connected with preparing very thin (a few microns) ribbons of high value MCE alloys with good mechanical properties.
In this article we show the results of designing Gd thin foils with the help of cold rolling technique and magnetocaloric properties of such media.
The disadvantage of this approach is that work hardening may affect the magnetocaloric properties of well-characterized bulk materials in an undesirable way.
Next advantage of this approach is good mechanical properties of prepared foils – they are elastic and flexible.
Kuz’min, Factors limiting the operation frequency of magnetic refrigerators, Appl.
In this article we show the results of designing Gd thin foils with the help of cold rolling technique and magnetocaloric properties of such media.
The disadvantage of this approach is that work hardening may affect the magnetocaloric properties of well-characterized bulk materials in an undesirable way.
Next advantage of this approach is good mechanical properties of prepared foils – they are elastic and flexible.
Kuz’min, Factors limiting the operation frequency of magnetic refrigerators, Appl.
Online since: May 2012
Authors: Zhi Qiang Ji, Chuan Kai Zhao, Xue Yan Xu
Coupling among heat, moisture, and mechanical deformations is solved based on finite element method.
The frost depths and deformations also the porosity in consideration of the orthotropic properties of frozen soil is discussed.
Method of numerical solution It is assumed that the response of the soil to loads is elastic (total stress analysis), and the elastic properties depend on the temperature.
These results are consistent with the fact that freezing speed significantly affects the frost heave amount.
(2)The porosity character is nonuniform distribution along the soil column, the temperature gradient is one of primary factor affected the porosity rate.
The frost depths and deformations also the porosity in consideration of the orthotropic properties of frozen soil is discussed.
Method of numerical solution It is assumed that the response of the soil to loads is elastic (total stress analysis), and the elastic properties depend on the temperature.
These results are consistent with the fact that freezing speed significantly affects the frost heave amount.
(2)The porosity character is nonuniform distribution along the soil column, the temperature gradient is one of primary factor affected the porosity rate.
Online since: July 2013
Authors: Li Juan Yu, Ya Nan Niu
Research on Influencing Factors of Electrostatic Force in a Micro-Force Calibration Device
Lijuan Yu1, a, Yanan Niu2,b
1,2 Mechanical scientific and Engineering College,Jilin University,Changchun 130022, China
atallyu@163.com, bbelievenyn@126.com
Keywords: micro-force calibration, lever principle, electrostatic force reproduction, finite element analysis.
The manufacturing material of lever must be low density, high intensity and good machining property; Knife-edge bearing must be small incision radius, high hardness and low friction coefficient.
For a manufactured one-dimensional capacitor, the capacitance gradient dC/dz is its inherent property.
For other influencing factors, this paper conducted the following research by Maxwell.
Because the error of the mean value with the theoretical value is 4.93%,simple change of the thickness of the internal electrode end cover have no significant affect on the electrostatic force. 3) The influence of the thickness of the insulating layer outside the external electrode Capacitor need stable voltage applied between the electrodes,but the external electrode exposing is not safe,thus it must be insulated.The purpose of this study is to explore the relationship between the thickness of the insulating layer and electrostatic force.
The manufacturing material of lever must be low density, high intensity and good machining property; Knife-edge bearing must be small incision radius, high hardness and low friction coefficient.
For a manufactured one-dimensional capacitor, the capacitance gradient dC/dz is its inherent property.
For other influencing factors, this paper conducted the following research by Maxwell.
Because the error of the mean value with the theoretical value is 4.93%,simple change of the thickness of the internal electrode end cover have no significant affect on the electrostatic force. 3) The influence of the thickness of the insulating layer outside the external electrode Capacitor need stable voltage applied between the electrodes,but the external electrode exposing is not safe,thus it must be insulated.The purpose of this study is to explore the relationship between the thickness of the insulating layer and electrostatic force.
Online since: February 2012
Authors: Archimede Forcellese, Michela Simoncini, Gianluca Buffa, Livan Fratini
The effect of the different tool configurations and sizes, and welding parameters on mechanical properties of FSWed joints were analyzed in detail.
The use of a numerical tool has allowed investigating the distribution of temperature for the welding configurations characterized by higher mechanical properties.
The mechanical properties of the welded joints were evaluated by means of tensile tests performed at room temperature on specimens, machined from the friction stir welded blanks with the loading direction perpendicular to the welding line.
The FSWed joints, showing the higher mechanical properties in terms of ultimate tensile strength and ultimate elongation, were obtained with a pinless tool characterized by a shoulder diameter of 19 mm.
Simoncini, Mechanical properties and microstructure of joints in AZ31 thin sheets obtained by friction stir welding using ‘‘pin’’ and ‘‘pinless’’ tool configurations, Materials and Design 34 (2012) 219–229
The use of a numerical tool has allowed investigating the distribution of temperature for the welding configurations characterized by higher mechanical properties.
The mechanical properties of the welded joints were evaluated by means of tensile tests performed at room temperature on specimens, machined from the friction stir welded blanks with the loading direction perpendicular to the welding line.
The FSWed joints, showing the higher mechanical properties in terms of ultimate tensile strength and ultimate elongation, were obtained with a pinless tool characterized by a shoulder diameter of 19 mm.
Simoncini, Mechanical properties and microstructure of joints in AZ31 thin sheets obtained by friction stir welding using ‘‘pin’’ and ‘‘pinless’’ tool configurations, Materials and Design 34 (2012) 219–229
Online since: July 2015
Authors: A.S. Benosman, Y. Senhadji, M. Mouli
From this study, it was found that the PET-modified mortars exposed to aggressive environments showed better resistance to chemical attack than unmodified one without substantially affecting the mechanical strength in tap water and UPV values decrease as the proportion of PET waste in the mix increases.
So, several works have been performed or are under way to evaluate the properties of cement-composites containing various types of plastic waste as aggregate, filler or fiber.
Moreover, Cobîrzan et al. [11] reported that considering sustainability principles, the building materials, structural and non structural element or an entire construction must be designed in order to resist to mechanical, chemical and physical damages, and not affecting air, water and soil quality during entire lifecycle.
Therefore, we felt it important to study and evaluate the influence of these additions, substitutions such as cement, on the sustainable properties of hardened mortar or composite.
For this we crafted four types of composite materials containing PET (0%, 6%, 12% and 17% by volume fractions), on which we measured the properties of PET-mortar composites by destructive and non-destructive testing and for chemical resistance to acid solutions at different concentrations.
So, several works have been performed or are under way to evaluate the properties of cement-composites containing various types of plastic waste as aggregate, filler or fiber.
Moreover, Cobîrzan et al. [11] reported that considering sustainability principles, the building materials, structural and non structural element or an entire construction must be designed in order to resist to mechanical, chemical and physical damages, and not affecting air, water and soil quality during entire lifecycle.
Therefore, we felt it important to study and evaluate the influence of these additions, substitutions such as cement, on the sustainable properties of hardened mortar or composite.
For this we crafted four types of composite materials containing PET (0%, 6%, 12% and 17% by volume fractions), on which we measured the properties of PET-mortar composites by destructive and non-destructive testing and for chemical resistance to acid solutions at different concentrations.
Online since: January 2018
Authors: Mohamed Helmy, Hassan El-Hofy, M.H. El-Hofy
Introduction
Over the last few decades, the demand for carbon fiber reinforced plastics (CFRPs) is increased compared to other traditional metals owing to their superior mechanical and physical properties.
In his regard, cutting speed and feed rate are significant factors that affect the machined surface quality and tool wear [6].
As described earlier, these factors are responsible for the generation of higher feed Fx and normal Fy forces.
Bouncing-back (mm) = -0.01475 - 0.000077*A + 0.000189*B + 0.05200*C (1) Summary The investigation revealed that C, BC, and B are the most significant factors affecting the feed force and normal force due to the increase in chip thickness area.
The depth of cut C, the interaction BC, and feed rate B are the most significant factors that affect the bounce back.
In his regard, cutting speed and feed rate are significant factors that affect the machined surface quality and tool wear [6].
As described earlier, these factors are responsible for the generation of higher feed Fx and normal Fy forces.
Bouncing-back (mm) = -0.01475 - 0.000077*A + 0.000189*B + 0.05200*C (1) Summary The investigation revealed that C, BC, and B are the most significant factors affecting the feed force and normal force due to the increase in chip thickness area.
The depth of cut C, the interaction BC, and feed rate B are the most significant factors that affect the bounce back.