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Online since: October 2006
Authors: Roberto Roberti, Annalisa Pola, Ermanno Bertoli, Disman Furloni
The thixocast components, being manufactured at present, are usually produced by means of the
standard foundry alloys (A356, A357); the mechanical properties of these parts, although superior to
those of traditional castings, can be further increased by using custom alloys.
These factors, together with morphology of the solid phase in semisolid state and castability of the slurry, affect the semisolid forming of metals and the mechanical properties of the final parts.
Particularly, A356 and A357 alloys (Si content 7%) are the most widely used also in semi-solid applications, because of their excellent castability, due to the alpha phase spheroid particles dispersed in the eutectic, wide solidification range and good mechanical properties.
Different combinations of these elements were simulated in order to obtain an optimized alloy for semisolid technology, characterized also by good mechanical properties.
Carr, A.J.: Mechanical stir casting of aluminium alloys from the mushy state: process, microstructure and mechanical properties, Materials Science and Engineering: A Volume: 326, Issue: 2, March 31, (2002), p. 370-381
These factors, together with morphology of the solid phase in semisolid state and castability of the slurry, affect the semisolid forming of metals and the mechanical properties of the final parts.
Particularly, A356 and A357 alloys (Si content 7%) are the most widely used also in semi-solid applications, because of their excellent castability, due to the alpha phase spheroid particles dispersed in the eutectic, wide solidification range and good mechanical properties.
Different combinations of these elements were simulated in order to obtain an optimized alloy for semisolid technology, characterized also by good mechanical properties.
Carr, A.J.: Mechanical stir casting of aluminium alloys from the mushy state: process, microstructure and mechanical properties, Materials Science and Engineering: A Volume: 326, Issue: 2, March 31, (2002), p. 370-381
Online since: January 2017
Authors: Jian Sheng Chen, Cui Cui Su
However, these materials are susceptible to damage induced by mechanical, chemical, thermal, UV radiation, or a combination of these factors. [1] Cracks and damages in materials alter their mechanical, electrical and thermal properties and thus result in failure of structures. [2] Cracks and damages in materials even at a microscopic level alter their acoustical, electrical and thermal properties resulting in failure of structures.
To determine which microencapsulation technique should be adopted, the following factors must be considered: properties of the core material, capsule size, encapsulation efficiency, resistance of the capsules to compounding with the matrix, and interfacial interactions between the microcapsule and matrix.
Initially, the research in this regard was focused on recovery of mechanical properties.
Available approaches to self-healing may be applied to restoration of other properties aside from mechanical property, such as conductivity.
Factors such as healing speed, healing efficiency, repeatability in healing, healable crack scales and compatibility with matrix materials must be characterized and considered clearly.
To determine which microencapsulation technique should be adopted, the following factors must be considered: properties of the core material, capsule size, encapsulation efficiency, resistance of the capsules to compounding with the matrix, and interfacial interactions between the microcapsule and matrix.
Initially, the research in this regard was focused on recovery of mechanical properties.
Available approaches to self-healing may be applied to restoration of other properties aside from mechanical property, such as conductivity.
Factors such as healing speed, healing efficiency, repeatability in healing, healable crack scales and compatibility with matrix materials must be characterized and considered clearly.
Online since: December 2009
Authors: Drago Skrtic, Justin N.R. O'Donnell
Poly(ethyleneglycol)-extended UDMA (PEG-U) was
found to further improve DVC of UDMA-based matrices, while not adversely affecting PS and PSS
[9].
Zr-ACP was chosen as a standard filler based on the extensive evaluation of its stability in different aqueous environments as well as the mechanical strength and ion-release properties of the composites based on this type of ACP and a variety of resin matrices [1, 2, 9].
To achieve handling properties comparable to ACP-composites, 70 mass % glass was blended with the resin.
Discussion Degree of vinyl conversion (DVC) attained in dental resin systems upon polymerization is affected by a number of factors, among which the chemical structure of the monomers and the glass transition temperature (Tg) appear to be of high importance.
It is, however, possible that other factors such as the level of air entrapment and light scattering (affected by profoundly heterogeneous sizes of ACP filler particles) may also reduce the DVC of composites.
Zr-ACP was chosen as a standard filler based on the extensive evaluation of its stability in different aqueous environments as well as the mechanical strength and ion-release properties of the composites based on this type of ACP and a variety of resin matrices [1, 2, 9].
To achieve handling properties comparable to ACP-composites, 70 mass % glass was blended with the resin.
Discussion Degree of vinyl conversion (DVC) attained in dental resin systems upon polymerization is affected by a number of factors, among which the chemical structure of the monomers and the glass transition temperature (Tg) appear to be of high importance.
It is, however, possible that other factors such as the level of air entrapment and light scattering (affected by profoundly heterogeneous sizes of ACP filler particles) may also reduce the DVC of composites.
Online since: October 2006
Authors: Tae Whan Hong
Especially, the hydrogenation
properties were depended on properties of globules and liquid fraction.
Introduction Magnesium and magnesium alloys were known as the materials having a good specific strength structurally and variable smart properties [1].
According to the PCI results on partially remelted Mg-10Al alloys, partially remelted microstructure and crushing effect on specimen affected the hydrogenation properties affirmatively.
Especially, hydrogenation properties were affected by following factors: 1) liquid fraction with liquid droplets, 2) properties of globules.
Thus, partially remelted Mg-10Al/Mg-6Mn Mg alloy were found to have excellent hydrogenation properties compared with conventional casting/polycrystalline ones.
Introduction Magnesium and magnesium alloys were known as the materials having a good specific strength structurally and variable smart properties [1].
According to the PCI results on partially remelted Mg-10Al alloys, partially remelted microstructure and crushing effect on specimen affected the hydrogenation properties affirmatively.
Especially, hydrogenation properties were affected by following factors: 1) liquid fraction with liquid droplets, 2) properties of globules.
Thus, partially remelted Mg-10Al/Mg-6Mn Mg alloy were found to have excellent hydrogenation properties compared with conventional casting/polycrystalline ones.
Online since: May 2013
Authors: Xue Ping Mao, Su Yang Hu, Hong Xu, Yang Yu, Jun Yuan, Xiao Wang
Researches mainly focus on the processing properties, mechanical properties and creep properties [1].
The chemical compositions and mechanical properties at room temperature of the experimental P92 steels in this study are shown in Table 1 and Table 2, respectively.
The Steady creep rate represents the creep properties of the materials.
Creep fracture time reflects the material’s fracture properties.
So its effect on the mechanical properties is very small.
The chemical compositions and mechanical properties at room temperature of the experimental P92 steels in this study are shown in Table 1 and Table 2, respectively.
The Steady creep rate represents the creep properties of the materials.
Creep fracture time reflects the material’s fracture properties.
So its effect on the mechanical properties is very small.
Online since: September 2014
Authors: Jun Wang, Peng Yao, Zhong Wei Zhang, Yong Wang, Hong Tao Zhu, Chuan Zhen Huang
Introduction
The alumina ceramics has various inherent properties such as high hardness, great thermal stability, chemical inertness and excellent wear resistance.
The properties parameters of alumina ceramics are listed in table 1.
The properties of alumina ceramic wafer Material Density (g/cm3) Vickers hardness (GPa) Bending strength (MPa) Fracture toughness (MPa·m1/2) Alumina 3.7 20 320 3 There are a lot of variables and virtually all these variables affect the erosion results.
In the experiments, four main factors were chosen, i.e. jet impact angle, standoff distance, water pressure, abrasive particle diameter.
This is because the water pressure directly affects the erosion kinetic energy of the abrasive particle.
The properties parameters of alumina ceramics are listed in table 1.
The properties of alumina ceramic wafer Material Density (g/cm3) Vickers hardness (GPa) Bending strength (MPa) Fracture toughness (MPa·m1/2) Alumina 3.7 20 320 3 There are a lot of variables and virtually all these variables affect the erosion results.
In the experiments, four main factors were chosen, i.e. jet impact angle, standoff distance, water pressure, abrasive particle diameter.
This is because the water pressure directly affects the erosion kinetic energy of the abrasive particle.
Online since: May 2011
Authors: Cai Chun Wei, Yi Nian Zhu, Hui Li Liu, Zong Qiang Zhu, Hui Qin
So it has obvious anisotropy of mechanical properties [3].
Lignin in them can enhance the mechanical properties.
They have common characteristics that improve the mechanical properties of materials and design rational porous structures, etc.
Property and characterization Property. (1) Mechanical properties.
During the preparation process, immersing percent and carbonization temperature of resin are the main factors to affect woodceramic’s mechanical properties.
Lignin in them can enhance the mechanical properties.
They have common characteristics that improve the mechanical properties of materials and design rational porous structures, etc.
Property and characterization Property. (1) Mechanical properties.
During the preparation process, immersing percent and carbonization temperature of resin are the main factors to affect woodceramic’s mechanical properties.
Online since: June 2020
Authors: Cristian A. Paredes, Christian G Bautista, Patricio I. Mena, Marco Antonio Paredes
From this arises the need to work with environmentally friendly materials that apart from having an easy recycling process reduce the weight of the element without affecting the mechanical characteristics [3, 4, 5].
This is the specific case of horsehair which is only used for decorative or clothing purposes, wasting its great mechanical properties [6, 7].
Subsequently, the regulations to be followed are revised to obtain the test pieces and the equipment used to determine the mechanical properties in the different tests.
A review on chemical and mechanical properties of natural fiber reinforced polymer composites.
Standard test method for tensile properties of polymer matrix composite materials.
This is the specific case of horsehair which is only used for decorative or clothing purposes, wasting its great mechanical properties [6, 7].
Subsequently, the regulations to be followed are revised to obtain the test pieces and the equipment used to determine the mechanical properties in the different tests.
A review on chemical and mechanical properties of natural fiber reinforced polymer composites.
Standard test method for tensile properties of polymer matrix composite materials.
Online since: September 2014
Authors: Marcin Hojny
There are three main factors causing density changes: solid phase formation, thermal shrinkage and liquid phase flow inside the mushy zone.
As a result a method of computer aided investigation of mechanical properties of mushy steel has been developed as well as experimental procedures conducted by using Gleeble 3800 thermo-mechanical simulator[13-18].
Such non-uniform temperature distribution is the source of significant differences in the microstructure and hence in material rheological properties.
Therefore, the study of multiscale modelling of mechanical properties is the main target of the future work.
Hwan, Phase-field modelling of the thermo-mechanical properties of carbon steels, Acta Mat. 50 (2002) 2259-2268
As a result a method of computer aided investigation of mechanical properties of mushy steel has been developed as well as experimental procedures conducted by using Gleeble 3800 thermo-mechanical simulator[13-18].
Such non-uniform temperature distribution is the source of significant differences in the microstructure and hence in material rheological properties.
Therefore, the study of multiscale modelling of mechanical properties is the main target of the future work.
Hwan, Phase-field modelling of the thermo-mechanical properties of carbon steels, Acta Mat. 50 (2002) 2259-2268
Online since: August 2017
Authors: Zheng Mei Zhang, Bao Liang Xing, Jing Wang, Shao Hua Li, Hui Ying Cao
Test material of workpiece is aluminium alloy (7075-T651) which mechanical properties are shown in Table 1.
Table 1 Mechanical properties of aluminium alloy (7075-T651) Material properties Computation unit Numerical value Tensile strength [MPa] 570 Yield strength [MPa] 505 Elongation [%] 11 Maximum shear stress [MPa] 330 Hardness [HB] 150 Density [g/cm3] 2.85 Design of Experiment.
In a milling operation there are many factors that can affect the cutting force.
In this paper these are selected as design factors while other parameters have been assumed to be constant over the experimental domain.
The experimental results are analyzed with analysis of variance, which is used for identifying the factors and the experimental errors significantly affecting the performance measures.
Table 1 Mechanical properties of aluminium alloy (7075-T651) Material properties Computation unit Numerical value Tensile strength [MPa] 570 Yield strength [MPa] 505 Elongation [%] 11 Maximum shear stress [MPa] 330 Hardness [HB] 150 Density [g/cm3] 2.85 Design of Experiment.
In a milling operation there are many factors that can affect the cutting force.
In this paper these are selected as design factors while other parameters have been assumed to be constant over the experimental domain.
The experimental results are analyzed with analysis of variance, which is used for identifying the factors and the experimental errors significantly affecting the performance measures.