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Online since: July 2022
Authors: Peter Frohn-Sörensen, Jonas Reuter, Daniel Nebeling, Bernd Engel
Material Characterization and Modelling
Technical material properties.
Table 1: Mechanical material parameters obtained from tensile tests.
The FLC model of Keeler is parameterized by the mechanical material properties evaluated in tensile tests.
A factor 2 downscaled assembly is utilized which also means reducing the specimen dimensions.
Paul, “Controlling factors of forming limit curve: A review,” Advances in Industrial and Manufacturing Engineering, vol. 2, p. 100033, May 2021, doi: 10.1016/j.aime.2021.100033
Table 1: Mechanical material parameters obtained from tensile tests.
The FLC model of Keeler is parameterized by the mechanical material properties evaluated in tensile tests.
A factor 2 downscaled assembly is utilized which also means reducing the specimen dimensions.
Paul, “Controlling factors of forming limit curve: A review,” Advances in Industrial and Manufacturing Engineering, vol. 2, p. 100033, May 2021, doi: 10.1016/j.aime.2021.100033
Online since: September 2016
Authors: Sergey Egorov, Alexey Kapitanov, Dmitriy Loktev
Cutters with indexable inserts have higher economic efficiency compared to cutters with brazed cutting tips due to the following factors [15-17]:
- no need to resharpen knives with brazed tips, as a result resharpening expenses are excluded;
- a cutter construction has no knives so it makes the construction simpler and cheaper;
- indexable inserts are fixed mechanically, so there is no need to braze and then to rebraze them at the end of their efficient life
The brazed cutting tips can be hardly coated due to brazed joints whose properties can be changed when heated to the temperature of the coating.
Solonitsyn, Increasing the technological capabilities of the process finish machining of gear wheels, Journal of mechanical engineering. 11 (2005) 47-49
Zaitsev, The Selection of the optimum process of machining gear teeth, Journal of mechanical engineering. 7 (2008) 40-41
Kharlamov, Improving the efficiency of processing of straight-toothed bevel gears, Science intensive technologies in mechanical engineering. 3 (2015) 8-16
The brazed cutting tips can be hardly coated due to brazed joints whose properties can be changed when heated to the temperature of the coating.
Solonitsyn, Increasing the technological capabilities of the process finish machining of gear wheels, Journal of mechanical engineering. 11 (2005) 47-49
Zaitsev, The Selection of the optimum process of machining gear teeth, Journal of mechanical engineering. 7 (2008) 40-41
Kharlamov, Improving the efficiency of processing of straight-toothed bevel gears, Science intensive technologies in mechanical engineering. 3 (2015) 8-16
Online since: June 2013
Authors: Jun Zhang, Ya Hui Duan, Jia Ming Wang
In the construction process of concrete, the air temperature and earth temperature are the main factors which influence the temperature field and temperature stress.
According to the parameters of Xiluodu spiral case concrete, the thermal parameters are listed in Table 1, and the mechanical parameters are listed in Table 2.
For the surrounding rock, the thermal parameters are listed in Table 3, and the mechanical parameters are listed in Table 4.
It gives the free mechanical boundary conditions in stress field calculation before interfaces are covered, and the mechanical boundary disappear after interfaces are covered.
Concrete strength significantly affects the temperature stress.
According to the parameters of Xiluodu spiral case concrete, the thermal parameters are listed in Table 1, and the mechanical parameters are listed in Table 2.
For the surrounding rock, the thermal parameters are listed in Table 3, and the mechanical parameters are listed in Table 4.
It gives the free mechanical boundary conditions in stress field calculation before interfaces are covered, and the mechanical boundary disappear after interfaces are covered.
Concrete strength significantly affects the temperature stress.
Online since: September 2013
Authors: Thipusa Wongpinij, Pornwasa Wongpanya
In order to achieve important properties of decorative Ni-Cr plating, i.e., oxidation resistance, beautiful appearance and good adhesion, surface of substrate was necessarily prepared under medium roughness and then it was pre-plated with the thickest Ni layer before Cr coating was applied.
The adhesion between the plating layer and substrate depends on mechanical interlocking, directly related to surface roughness of substrate [4].
Thus, nickel has higher atomic packing factor than chromium that results in lower diffusion of oxygen through the Ni pre-plating layer.
This might be from they lost mechanical interlocking from low surface roughness resulting in lower adhesion strength [12].
A medium surface roughness of substrate before coating was necessary for approaching mechanical interlocking between substrate and coating layer.
The adhesion between the plating layer and substrate depends on mechanical interlocking, directly related to surface roughness of substrate [4].
Thus, nickel has higher atomic packing factor than chromium that results in lower diffusion of oxygen through the Ni pre-plating layer.
This might be from they lost mechanical interlocking from low surface roughness resulting in lower adhesion strength [12].
A medium surface roughness of substrate before coating was necessary for approaching mechanical interlocking between substrate and coating layer.
Online since: September 2020
Authors: Vasiliy Smirnov, Alexander Rodin, Sergej Karpushin
During operation, structures made of concrete and reinforced concrete are negatively affected by various factors: atmospheric, technological, etc.
Depending on the climatic conditions that vary with the time of year, the objects’ geographical location, the individual factors’ impact degree is different.
It is known that the action of various climatic factors leads to a change in the composition and structure of building materials [7, 16, 17, 18, 19].
Smirnov, Determination of the heat resistance of polymer construction materials by the dynamic mechanical method, Polymer Science – Series D. 10 (4) (2017) 313-317. doi: 10.1134/S1995421217040141
Tuvin, Structure, composition and properties of geopolymers from mineral wool waste, Magazine of Civil Engineering. 90 (6) (2019) 3–14.
Depending on the climatic conditions that vary with the time of year, the objects’ geographical location, the individual factors’ impact degree is different.
It is known that the action of various climatic factors leads to a change in the composition and structure of building materials [7, 16, 17, 18, 19].
Smirnov, Determination of the heat resistance of polymer construction materials by the dynamic mechanical method, Polymer Science – Series D. 10 (4) (2017) 313-317. doi: 10.1134/S1995421217040141
Tuvin, Structure, composition and properties of geopolymers from mineral wool waste, Magazine of Civil Engineering. 90 (6) (2019) 3–14.
Online since: February 2014
Authors: Zhao Chen, Xiao Li Wen, Chang Le Chen
Introduction
The influence of Rotating magnetic field on the solidification microstructure during solidification process has aroused extensive interest in the field of material physics.[1-5] It is well know that the alloy composition and processing conditions greatly determine the microstructure of alloy influencing the mechanical properties of alloy.[6] RMF play a main role in generating fluid convection changing the solute distribution and the heat transfer condition near the front of solid-liquid interface. [7]It further demonstrates that RMF can be used to change the solidification parameters of growth velocity, temperature gradient and heat transfer condition during solidification process, and which affect the final microstructure.
In the last decades, there are some reports on the effect of RMF on the microstructure via experiments and numerical simulations.[8-12] The effect of RMF is mainly reflected in three factors: grain refinement[13,14], modified macrosegregation [15,16] and the transition of structure morphology[17-19].
The experiment results demonstrate that magnetic intensity and rotating frequency of rotating magnetic field are the main factors influencing significantly solidification microstructure.
According to the classical nucleation theory [24], the nucleation rate is expressed as follows (7) where, is a constant, and is the melting entropy, and is the undercooling, is the solid-liquid interface energy, and is the wetting angle,is the wetting angle factor, is atom diffusion activation energy, and is Boltzmann constant.
On the other hand, the gravity in the melt is a factor that should not be neglected in solidification process.
In the last decades, there are some reports on the effect of RMF on the microstructure via experiments and numerical simulations.[8-12] The effect of RMF is mainly reflected in three factors: grain refinement[13,14], modified macrosegregation [15,16] and the transition of structure morphology[17-19].
The experiment results demonstrate that magnetic intensity and rotating frequency of rotating magnetic field are the main factors influencing significantly solidification microstructure.
According to the classical nucleation theory [24], the nucleation rate is expressed as follows (7) where, is a constant, and is the melting entropy, and is the undercooling, is the solid-liquid interface energy, and is the wetting angle,is the wetting angle factor, is atom diffusion activation energy, and is Boltzmann constant.
On the other hand, the gravity in the melt is a factor that should not be neglected in solidification process.
Online since: January 2016
Authors: Petr Selnik, Klara Necadova, Hana Bedliva, Martin Mohapl
The material has almost the same properties as SENIZOL AT14.
Parameter that most compensates the material properties of the water flow is the pitch of the roof.
The properties of material are therefore variable with angle and in the case of commercial use of the material it is necessary to define its properties accordingly to installation in different inclinations of the structure.
Similar properties can be found also in the mentioned element IZOL 175P.
The measured properties are influenced by fire improvement, which is the material treated with.
Parameter that most compensates the material properties of the water flow is the pitch of the roof.
The properties of material are therefore variable with angle and in the case of commercial use of the material it is necessary to define its properties accordingly to installation in different inclinations of the structure.
Similar properties can be found also in the mentioned element IZOL 175P.
The measured properties are influenced by fire improvement, which is the material treated with.
Online since: February 2016
Authors: Svetlana A. Barannikova, Julia Li, Anatoly Malinovsky, Dmitrii Pestsov
Therefore, keen interest is taken to date in experimental studies of austenitic stainless steel single crystals whose strength properties are enhanced significantly due to the occurrence of interstitial impurity and extension axis orientation [1].
The above experimental evidence strongly suggests that the plastic deformation localization parameter V is affected by the strength characteristics of steels, which are determined by the single crystal geometry.
In our experiments an enhancement in material strength properties, a changeover in the regular features of material work hardening and in the micro-mechanisms involved in the deformation (glide or twinning) have been attained by variation in the extension axis orientation of high-manganese steels monocrystals.
Faghihi, Gradient plasticity for thermo-mechanical processes in metals with length and time scales, Phil.
Astafurova, The influence of severe plastic deformation by high pressure torsion on structure and mechanical properties of Hadfield steel single crystals, IOP: Conf.
The above experimental evidence strongly suggests that the plastic deformation localization parameter V is affected by the strength characteristics of steels, which are determined by the single crystal geometry.
In our experiments an enhancement in material strength properties, a changeover in the regular features of material work hardening and in the micro-mechanisms involved in the deformation (glide or twinning) have been attained by variation in the extension axis orientation of high-manganese steels monocrystals.
Faghihi, Gradient plasticity for thermo-mechanical processes in metals with length and time scales, Phil.
Astafurova, The influence of severe plastic deformation by high pressure torsion on structure and mechanical properties of Hadfield steel single crystals, IOP: Conf.
Online since: February 2022
Authors: D.A. Boldyrev, B.A. Kulakov, A.A. Tokarev, L.I. Popova
In terms of its properties, it is intermediate to laminated graphite iron (LGI), aka grey iron, and ductile iron (DI), aka spheroidal graphite iron.
CGI and LGI have similar solidification mechanisms [1], and as a result, they have better foundry properties in comparison with DI.
The main problem with producing CGI castings of satisfactory quality is that their properties are strongly sensitive to their wall thickness.
Part II: Influence on tensile mechanical properties, AFS Transactions. 118 (2010) 217-224
Wallace, Factors influencing the ferrictic layer on the surface of gray iron castings, AFS Trans. (1975) 531-550
CGI and LGI have similar solidification mechanisms [1], and as a result, they have better foundry properties in comparison with DI.
The main problem with producing CGI castings of satisfactory quality is that their properties are strongly sensitive to their wall thickness.
Part II: Influence on tensile mechanical properties, AFS Transactions. 118 (2010) 217-224
Wallace, Factors influencing the ferrictic layer on the surface of gray iron castings, AFS Trans. (1975) 531-550
Online since: August 2021
Authors: Galina Slavcheva, Ekaterina Britvina, Maria Shvedova
Currently, the main focus of research is shifting to the field of studying construction-related material requirements [6-11], such as structural build up, mechanical properties, durability and so on.
In the general set of these properties, the least studied is the problem of heat release in the process of structural build up of 3D-printable fresh mixture.
Gibb, T.Thorpe, Mix design and fresh properties for high-performance printing concrete.
Thorpe, Hardened properties of high-performance printing concrete.
Res. 108 (2018) 1-9. doi.org/10.1016/j.cemconres.2018.02.022 [9] Yu Zhang, Yunsheng Zhang, Wei She, Lin Yang, Guojian Liu, Yonggan Yang, Rheological and harden properties of the high-thixotropy 3D printing concrete.
In the general set of these properties, the least studied is the problem of heat release in the process of structural build up of 3D-printable fresh mixture.
Gibb, T.Thorpe, Mix design and fresh properties for high-performance printing concrete.
Thorpe, Hardened properties of high-performance printing concrete.
Res. 108 (2018) 1-9. doi.org/10.1016/j.cemconres.2018.02.022 [9] Yu Zhang, Yunsheng Zhang, Wei She, Lin Yang, Guojian Liu, Yonggan Yang, Rheological and harden properties of the high-thixotropy 3D printing concrete.