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Online since: April 2006
Authors: Vaclav Paidar
Interfaces and properties of advanced materials
V.
Introduction The properties of materials are affected to a large extent by the internal interfaces.
The interfaces are both sources and sinks of point defects as vacancies or imperfections and affect thus the properties sensitive to such defect concentrations.
It determines morphological stability of layers essential for the production of electronic devices and plays a crucial role for the mechanical properties as well.
Moreover, in addition to these extrinsic parameters, the intrinsic factors describing unequal boundary atomic structures such as a relative translation of the two grains has to be considered.
Introduction The properties of materials are affected to a large extent by the internal interfaces.
The interfaces are both sources and sinks of point defects as vacancies or imperfections and affect thus the properties sensitive to such defect concentrations.
It determines morphological stability of layers essential for the production of electronic devices and plays a crucial role for the mechanical properties as well.
Moreover, in addition to these extrinsic parameters, the intrinsic factors describing unequal boundary atomic structures such as a relative translation of the two grains has to be considered.
Online since: July 2018
Authors: Hao Liang
In this paper, the influence factors, such as sputtering power, sputtering oxygen argon ratio and sputtering temperature, are introduced.
It will determine the micro structure of the film, so it has some control on the electrical properties and optical properties of the film, affecting the practical application.
Ion beam sputtering ZnO films along the c axis orientation from the substrate temperature, oxygen partial pressure and sputtering factors.
Optical properties.
Electrical Properties.
It will determine the micro structure of the film, so it has some control on the electrical properties and optical properties of the film, affecting the practical application.
Ion beam sputtering ZnO films along the c axis orientation from the substrate temperature, oxygen partial pressure and sputtering factors.
Optical properties.
Electrical Properties.
Online since: July 2014
Authors: Murahari Kolli, Adepu Kumar
Analysis of variance (ANOVA) revealed that discharge current, pulse on time and B4C powder concentration in dielectric are most important parameters affecting both the performance parameters.
The standard EDM working conditions, Titanium alloy chemical composition and properties mentioned in the Table 1.
The degree of freedom of all the four factors is 8.
Also, it was found that the optimal levels of the performance factors for MRR are A3B3C3D3 and for SR are A1B1C1D1.
From ANOVA, discharge current and pulse on time are more important factors for MRR, whereas pulse on time, pulse on and concentration are more significant factors for SR.
The standard EDM working conditions, Titanium alloy chemical composition and properties mentioned in the Table 1.
The degree of freedom of all the four factors is 8.
Also, it was found that the optimal levels of the performance factors for MRR are A3B3C3D3 and for SR are A1B1C1D1.
From ANOVA, discharge current and pulse on time are more important factors for MRR, whereas pulse on time, pulse on and concentration are more significant factors for SR.
Online since: April 2014
Authors: Xing Xia Wang, Chen Jing Deng
Therefore, determining the range of excavation unloading zone accurately is one of the key factors to ensure the rationality and validity of numerical simulation results of rock slope excavation.
Formation of natural unloading zone is a very long period, which is often affected by climate, topography, rock type and structure.
Building the mechanical model.
Conclusions Rock mass in unloading zone is under unloading condition, whose stress and strain analysis, deformation analysis, and other numerical simulation should be based on the theory of unloading rock mass mechanics, for mechanical properties of rock mass under unloading condition are essentially different from properties under loading condition.
Determining the range of excavation unloading zone accurately is one of the key factors to ensure the rationality and validity of numerical simulation results of rock slope excavation.
Formation of natural unloading zone is a very long period, which is often affected by climate, topography, rock type and structure.
Building the mechanical model.
Conclusions Rock mass in unloading zone is under unloading condition, whose stress and strain analysis, deformation analysis, and other numerical simulation should be based on the theory of unloading rock mass mechanics, for mechanical properties of rock mass under unloading condition are essentially different from properties under loading condition.
Determining the range of excavation unloading zone accurately is one of the key factors to ensure the rationality and validity of numerical simulation results of rock slope excavation.
Online since: January 2021
Authors: Mansour Rokbi, Madani Grine, Brahim Baali, Houria Benkharbeche, Moustapha Ghebouli, Zine El Abidine Rahmouni
The use of plant fibers, jute in this study, as reinforcements outside the polymer concrete, acquires mechanical properties, traction, and flexion, more than appreciable, however, other characteristics must be studied to ensure better integration on the market.
Resin properties provided by Maghreb Pipe are presented in Table III.
Physico-chemical and mechanical properties of jute yarns and fabric can be found in the early work of Bouguessir et al. [14].
Bourchak, Effect of eco-friendly chemical sodium bicarbonate treatment on the mechanical properties of flax fibres: Weibull statistics.
Latelli, Mechanical properties of polymer concrete made with jute fabric and waste marble powder at various woven orientations, Int.
Resin properties provided by Maghreb Pipe are presented in Table III.
Physico-chemical and mechanical properties of jute yarns and fabric can be found in the early work of Bouguessir et al. [14].
Bourchak, Effect of eco-friendly chemical sodium bicarbonate treatment on the mechanical properties of flax fibres: Weibull statistics.
Latelli, Mechanical properties of polymer concrete made with jute fabric and waste marble powder at various woven orientations, Int.
Online since: June 2018
Authors: Tomasz Tański, Krzysztof Labisz
The scientific reason of this work is the applying of High Power Diode Laser (HPDL) for improvement of aluminium`s mechanical properties, especially the surface hardness.
Mechanical properties of the Al-Si alloys are linked to the shape and distribution or size of the Si eutectic present in the microstructure, for the reason of the enhancement of the mechanical properties.
The structure investigation and enhancement of mechanical properties, especially hardness is the practical aim of this project.
The aim of this work is to determine the used laser parameters and investigation of the obtained properties of the surface layer of the remelting zone and the heat affected zone.
The physical and mechanical properties are presented in table 2.
Mechanical properties of the Al-Si alloys are linked to the shape and distribution or size of the Si eutectic present in the microstructure, for the reason of the enhancement of the mechanical properties.
The structure investigation and enhancement of mechanical properties, especially hardness is the practical aim of this project.
The aim of this work is to determine the used laser parameters and investigation of the obtained properties of the surface layer of the remelting zone and the heat affected zone.
The physical and mechanical properties are presented in table 2.
Online since: November 2021
Authors: Ilya Men
Force Controlled Low Cycle Fatigue (LCF) Life Evaluation Methodology Based on Unstabilized Material Properties
Ilya Men
Senior analysis and applied mechanical engineer at Elbit Systems Ltd.
Additional modification coefficients accounting for factors such as mean stress correction and multiaxiality should also be provided.
Thus, according to Henning and Vehoff’s model of gage section for a small-scale tensile specimen, the material properties were not affected by the number of grains [20].
Hardness and tensile properties are summarized in table 1.
Additional factors such as stress triaxiality may be addressed by simultaneous tensile and torsional specimen loading. 3.
Additional modification coefficients accounting for factors such as mean stress correction and multiaxiality should also be provided.
Thus, according to Henning and Vehoff’s model of gage section for a small-scale tensile specimen, the material properties were not affected by the number of grains [20].
Hardness and tensile properties are summarized in table 1.
Additional factors such as stress triaxiality may be addressed by simultaneous tensile and torsional specimen loading. 3.
Online since: August 2014
Authors: Zhen You Huang, Chang Feng Li, Yu Hua Jin
Effective section thickness (EST) and interface morphology is the two important factors affecting the strength of overlap joint, and interface angle (stress concentration) and interface defect are the major failure modes of the joint, while, if the interface angle was smooth transition outside nugget area, the mechanics properties of the overlap joint will be greatly improved [5,6].
Moreover, the form and the vertical direction of the notch can reduce the mechanical properties by acting as crack initiation site during transversal loading .
Factors affecting the properties of friction stir welded aluminum lap joints.
Process optimization and mechanical properties of friction stir lap welds of 7075-T6 stringers on 2024-T3 skin.
Fatigue properties of friction stir overlap welds 2007; 29(1) :57–68
Moreover, the form and the vertical direction of the notch can reduce the mechanical properties by acting as crack initiation site during transversal loading .
Factors affecting the properties of friction stir welded aluminum lap joints.
Process optimization and mechanical properties of friction stir lap welds of 7075-T6 stringers on 2024-T3 skin.
Fatigue properties of friction stir overlap welds 2007; 29(1) :57–68
Online since: November 2010
Authors: Yong Zang, Qin Qin, Di Ping Wu, Jing Jing Li
The material used in the model is Q235 and
mechanics properties were selected according to references [7, 8].
Influence Factors of Web Thickening.
In order to analyze the influence factors of web thickening, the H-beam with the web of 75mm and the flange of 355mm for entry thickness was selected according to the rolling results of the second pass.
It is an important factor to lead to increase the rolling force.
It is well-known that the rolling reduction is an important factor to affect rolling force.
Influence Factors of Web Thickening.
In order to analyze the influence factors of web thickening, the H-beam with the web of 75mm and the flange of 355mm for entry thickness was selected according to the rolling results of the second pass.
It is an important factor to lead to increase the rolling force.
It is well-known that the rolling reduction is an important factor to affect rolling force.
Online since: July 2011
Authors: Wei Mo, Wen Ni, Shao Jian Ma, Jin Lin Yang, Jin Peng Feng, De Ping Chen
However, when the samples were used at higher temperatures (>800˚C), the volume shrinkage increased sharply, which directly led to a serious deformation and then affected thermal insulating properties in applications.
An ultrafine ceramic fiber named E-glass was used to improve mechanical properties of the composites with average diameter about 7 μm and length 5 mm.
However, when sample 1 is treated at higher temperatures than 800˚C, the volume shrinkage begins to increase sharply, which directly leads to a serious deformation and then affects mechanical properties.
Based on the principle of heat conduction in solids, the reduction of porosity means a drop in thermal insulating property for porous materials.
For this phase transformation, temperature is considered as one of the major factors.
An ultrafine ceramic fiber named E-glass was used to improve mechanical properties of the composites with average diameter about 7 μm and length 5 mm.
However, when sample 1 is treated at higher temperatures than 800˚C, the volume shrinkage begins to increase sharply, which directly leads to a serious deformation and then affects mechanical properties.
Based on the principle of heat conduction in solids, the reduction of porosity means a drop in thermal insulating property for porous materials.
For this phase transformation, temperature is considered as one of the major factors.