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Online since: July 2008
Authors: Heinz Leitner, Abdelrhani Lamik, Wilfried Eichlseder
Introduction
Many areas of mechanical engineering are characterized by a permanent development of
components and modules with the aim of reducing weight, increasing reliability, under the
consideration of physical properties such as corrosion resistance or thermal conductivity.
The local fatigue strength in the component is influenced by rolling reduction, stress concentrations, forming process, residual stress and by other factors.
Therefore mechanical behaviour of the material can be considered independent from the manufacturing process and there is no influence of the rolling reduction on the mechanical properties of AA6016 (see Fig.2).
The influence of the rolling process on the mechanical properties is significant.
Karimi Taheri: the effect of annealing treatment on mechanical properties of aluminium clad steel sheet, Materials & Design 24, 617-622, 2003
The local fatigue strength in the component is influenced by rolling reduction, stress concentrations, forming process, residual stress and by other factors.
Therefore mechanical behaviour of the material can be considered independent from the manufacturing process and there is no influence of the rolling reduction on the mechanical properties of AA6016 (see Fig.2).
The influence of the rolling process on the mechanical properties is significant.
Karimi Taheri: the effect of annealing treatment on mechanical properties of aluminium clad steel sheet, Materials & Design 24, 617-622, 2003
Online since: September 2020
Authors: Sergey Stel'makh, Evgeniy Shcherban', Aleksandr Khalyushev, Andrei Chernil'nik
This article discusses the surface modification effect’s laws in a high-voltage electric field on the autogenous properties of mineral dispersed concrete components, structure formation processes, mechanical properties, and cement stone hydration products.
The properties of concrete largely depend on the content of fine fractions in cement, which also determines the packing density of particles [5].
The aim of this work is to establish the laws of the surface modification effect on the autohesion properties of mineral dispersed concrete components, the process of structure formation, physical and mechanical properties and the cement stone hydration products.
The change in the electro-surface properties of the powders should also affect the interparticle interactions in the solid-liquid system.
Koishi, A comparison of the fluidity of spherical cement with that of broad cement and a study of the properties of fresh concrete using spherical cement, Cem.
The properties of concrete largely depend on the content of fine fractions in cement, which also determines the packing density of particles [5].
The aim of this work is to establish the laws of the surface modification effect on the autohesion properties of mineral dispersed concrete components, the process of structure formation, physical and mechanical properties and the cement stone hydration products.
The change in the electro-surface properties of the powders should also affect the interparticle interactions in the solid-liquid system.
Koishi, A comparison of the fluidity of spherical cement with that of broad cement and a study of the properties of fresh concrete using spherical cement, Cem.
Online since: July 2014
Authors: Hong Xia Yu, Zhen Yang Lin
Safety Range of Braking Force Distribution
For general cars, according to the factors like distribution of braking force of front and rear axles, road adhesion coefficient and so on, the following three conditions may occur during braking:
1.
Therefore, the brake force distribution will affect the direction stability of the vehicle when braking.
As the main power unit of electric vehicle, the overcharging seriously affects its cycle life and safety.
By introducing a weight factor c so the vehicle braking recover energy can be limited.
At the same time it meets the mechanical properties and prevents battery overcharging effectively.
Therefore, the brake force distribution will affect the direction stability of the vehicle when braking.
As the main power unit of electric vehicle, the overcharging seriously affects its cycle life and safety.
By introducing a weight factor c so the vehicle braking recover energy can be limited.
At the same time it meets the mechanical properties and prevents battery overcharging effectively.
Online since: August 2013
Authors: Li Jun Hou, Xin Zhao Jiang, Hua Lu, Yang Wang, Xiao Yan Wang
We can get the basic test principles of the intergranular suction, based on the analyses of definition of intergranular suction, its characters and influencing factors.
The influence of the acidic aqueous solution on mechanical properties of cohesive soil and the influence of NaCl on the surface tension of water are obvious.
Those also show that wet suction is affected by the influence of the aqueous solution of chemical properties, but the impact is not the same and just as shown in Fig.5 and Fig.6.
This is an important significance for the study of the quantitative relationship between structural mechanics and mechanical properties of soil
This also can help to study the deformation properties and strength properties of the unsaturated soil with dynamic point of view.
The influence of the acidic aqueous solution on mechanical properties of cohesive soil and the influence of NaCl on the surface tension of water are obvious.
Those also show that wet suction is affected by the influence of the aqueous solution of chemical properties, but the impact is not the same and just as shown in Fig.5 and Fig.6.
This is an important significance for the study of the quantitative relationship between structural mechanics and mechanical properties of soil
This also can help to study the deformation properties and strength properties of the unsaturated soil with dynamic point of view.
Online since: April 2016
Authors: Stanislaw Mrozinski
The course of the energy accumulation is affected by multiple factors such as temperature
and the load program [9,10].
The strain energy is also affected by temperature.
Based on the analysis of the developed graphs, it can be concluded that the change of cyclic properties of cast steel depends to a small extent on the sequence of the load program stages.
The energy changes confirm earlier observations indicating that plastic strain energy DWpl is the parameter of the hysteresis loop that is least sensitive to changes of cyclic properties.
[10] Mroziński S., Golański G., Influence of temperature change on fatigue properties of P91 steel, Materials Research Innovations, Volume 18 Issue S2 (may 2014), pp. 504-508
The strain energy is also affected by temperature.
Based on the analysis of the developed graphs, it can be concluded that the change of cyclic properties of cast steel depends to a small extent on the sequence of the load program stages.
The energy changes confirm earlier observations indicating that plastic strain energy DWpl is the parameter of the hysteresis loop that is least sensitive to changes of cyclic properties.
[10] Mroziński S., Golański G., Influence of temperature change on fatigue properties of P91 steel, Materials Research Innovations, Volume 18 Issue S2 (may 2014), pp. 504-508
Online since: June 2014
Authors: Miguel Álvarez, Mariano Marcos Bárcena, Severo Raúl Fernández-Vidal, Pedro Francisco Mayuet, Pedro Arroyo, Alberto Portal
Mechanical Engineering and Industrial Design.
Introduction CFRC (Carbon Fiber Reinforced Composites) show excellent relationship weight/physico-mechanical properties, much higher than those in metallic materials.
The interface between the fibers of material offers low resistance to avoid time crack propagation, depending only on the properties of the matrix, much less resistant than fiber.
In order to dispose of an evaluation methodology of these defects a new factor DF based on the calculation of the percentage change of the affected area versus nominal area has been proposed.
It can be associated with the duration of the thermo mechanical effect on the workpiece.
Introduction CFRC (Carbon Fiber Reinforced Composites) show excellent relationship weight/physico-mechanical properties, much higher than those in metallic materials.
The interface between the fibers of material offers low resistance to avoid time crack propagation, depending only on the properties of the matrix, much less resistant than fiber.
In order to dispose of an evaluation methodology of these defects a new factor DF based on the calculation of the percentage change of the affected area versus nominal area has been proposed.
It can be associated with the duration of the thermo mechanical effect on the workpiece.
Online since: May 2016
Authors: Ming Chen, Guo Qiang Guo, Kang Li, Xu Dong He
Ultrasonic Vibration Turning of Stainless Slender Shaft: Investigation on Run-out of Two Clamping Methods
Xudong He1,2,a*, Guoqiang Guo1,b, Kang Li1,c and Ming Chen1,d
1School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, P.
The factors, for example, cutting force, cutting heat, vibration and so on, which are produced in the processing, will affect directly the size precision of workpieces.
(2) Weak rigidity makes the slender shaft might develop bending deformation under the action of a smaller force[6], and the stiffness of any point on slender shaft is various, making the actual cutting depth changing so as to affect the size accuracy[7].
As shown in Table 1, it is the mechanical properties of STS304.
Table 1 Mechanical properties of STS304 Material Tensile strength[MPa] Tensile modulus[MPa] Density [g/cm3] Elongation [%] Harness [HB] STS304 520 205-210 7.93 40 187 Fig.1 Run-out measuring Fig.2 Straightness measuring When using one end clamped and another pushed processing method, one end of the workpiece is clampedby chuck, clamping length 20mm, the other end tightened by pressure, tightened length 2mm, and tightening pressure varies from 0.5MPa to 2MPa.
The factors, for example, cutting force, cutting heat, vibration and so on, which are produced in the processing, will affect directly the size precision of workpieces.
(2) Weak rigidity makes the slender shaft might develop bending deformation under the action of a smaller force[6], and the stiffness of any point on slender shaft is various, making the actual cutting depth changing so as to affect the size accuracy[7].
As shown in Table 1, it is the mechanical properties of STS304.
Table 1 Mechanical properties of STS304 Material Tensile strength[MPa] Tensile modulus[MPa] Density [g/cm3] Elongation [%] Harness [HB] STS304 520 205-210 7.93 40 187 Fig.1 Run-out measuring Fig.2 Straightness measuring When using one end clamped and another pushed processing method, one end of the workpiece is clampedby chuck, clamping length 20mm, the other end tightened by pressure, tightened length 2mm, and tightening pressure varies from 0.5MPa to 2MPa.
Online since: August 2011
Authors: Takuya Uehara
One of the determining factors of this inaccuracy is the incompleteness of the modeling of transformation plasticity; an empirical and simplified formula, such that the induced strain is proportional to the applied load, has been utilized.
Isotropic properties are assumed, and the three terms on the right-hand side of Eq. (2) are expressed as , (3) where E, n, a, and b are the Young's modulus, Poisson's ratio, thermal expansion coefficient, and transformation dilatation coefficient, respectively, and dij is the Kronecker delta.
The mechanical properties, E, n, and yielding parameters such as initial yield stress s0 are assumed to be identical for both phases, while the thermal expansion coefficient is varied for the two phases as a1 and a2.
The temperature gradient affects the thermal stress, and consequently it affects the phase transformation due to the stress dependency.
Meanwhile, practical phase field simulations will also be demonstrated to show the microscopic deformation behavior and related mechanical properties of materials under phase transformation in the next stage of our study.
Isotropic properties are assumed, and the three terms on the right-hand side of Eq. (2) are expressed as , (3) where E, n, a, and b are the Young's modulus, Poisson's ratio, thermal expansion coefficient, and transformation dilatation coefficient, respectively, and dij is the Kronecker delta.
The mechanical properties, E, n, and yielding parameters such as initial yield stress s0 are assumed to be identical for both phases, while the thermal expansion coefficient is varied for the two phases as a1 and a2.
The temperature gradient affects the thermal stress, and consequently it affects the phase transformation due to the stress dependency.
Meanwhile, practical phase field simulations will also be demonstrated to show the microscopic deformation behavior and related mechanical properties of materials under phase transformation in the next stage of our study.
Online since: April 2014
Authors: Kannigar Dateraksa, Kritkaew Somton, Ryan C. McCuiston
Introduction
Advanced ceramics are currently used in many industrial sectors due to properties such as high hardness, good abrasion and corrosion resistance, and retention of high strength at high temperature.
Other significant factors affecting pressed green density include applied pressure, friction between granules and the die wall, granule flow-ability [1, 2], and particle size distribution (PSD) [3].
Factors affecting sintering shrinkage include the sintering profile, heating rate, green density, and material characteristics [4, 5].
The current work studied the effect of properties of 92% alumina spray dried granules on the compaction, and the amount of shrinkage during sintering of simple and complex shaped samples.
McCuiston, The effect of granule morphology and composition on the compaction behavior and mechanical properties of 92% alumina spray dried granules, J.
Other significant factors affecting pressed green density include applied pressure, friction between granules and the die wall, granule flow-ability [1, 2], and particle size distribution (PSD) [3].
Factors affecting sintering shrinkage include the sintering profile, heating rate, green density, and material characteristics [4, 5].
The current work studied the effect of properties of 92% alumina spray dried granules on the compaction, and the amount of shrinkage during sintering of simple and complex shaped samples.
McCuiston, The effect of granule morphology and composition on the compaction behavior and mechanical properties of 92% alumina spray dried granules, J.
Online since: May 2020
Authors: Marian Králik, Michal Bachratý, Vladimír Jerz
In mechanical loading of solid bodies, the impact of the surface properties on formation and spreading of surface cracks is obvious, mainly as regards cyclic loading.
Therefore, it is important to pay attention to knowledge of surface properties and their improvement.
Cold plastic deformation is the easiest way to change the mechanical properties of the materials.
Cold plastic deformation is the easiest way to change the mechanical properties of materials.
However, we must also take into account metallurgical and physical impacts, as well as material properties.
Therefore, it is important to pay attention to knowledge of surface properties and their improvement.
Cold plastic deformation is the easiest way to change the mechanical properties of the materials.
Cold plastic deformation is the easiest way to change the mechanical properties of materials.
However, we must also take into account metallurgical and physical impacts, as well as material properties.