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Online since: October 2010
Authors: Gen Cang Yang, Li Juan Yao, Yao He Zhou, Man Zhu
The as-cast
microstructures of A356 alloys contain coarse α-Al dendrites and circular eutectic silicon, which do
harm to its mechanical properties.
Great affects were made to change its microstructure in order to enhance the mechanical properties [1-5].
The grain refining efficiency, grain refinement mechanisms, and the enhanced mechanical properties were investigated.
In the procedure of T6 heat treatment, quenching rate following the solution treatment is the key factor affecting the precipitation behavior [10-13].
It can be found that the size and shape factor of silicon particles were greatly improved.
Great affects were made to change its microstructure in order to enhance the mechanical properties [1-5].
The grain refining efficiency, grain refinement mechanisms, and the enhanced mechanical properties were investigated.
In the procedure of T6 heat treatment, quenching rate following the solution treatment is the key factor affecting the precipitation behavior [10-13].
It can be found that the size and shape factor of silicon particles were greatly improved.
Online since: June 2013
Authors: Xiong Biao Chen, Xiao Yu Tian, Ming Gan Li
biomaterials
cells
Growth factors
Figure 6.
When shear stress is applied to cells, they will deform due to the weak elastic mechanical properties.
It holds the promise to simultaneously integrate the multiphenotype of cells, the ECM materials and growth factor together to create artificial tissue constructs that mimic the mechanical, chemical and biological properties of native tissue.
For example, nerve guidance by means of certain growth factors can be realized by adding the growth factors to specific locations and orientations of fibres.
Vascular networks can be formed with appropriate distributions of endothelial or stem cells and the growth factors.
When shear stress is applied to cells, they will deform due to the weak elastic mechanical properties.
It holds the promise to simultaneously integrate the multiphenotype of cells, the ECM materials and growth factor together to create artificial tissue constructs that mimic the mechanical, chemical and biological properties of native tissue.
For example, nerve guidance by means of certain growth factors can be realized by adding the growth factors to specific locations and orientations of fibres.
Vascular networks can be formed with appropriate distributions of endothelial or stem cells and the growth factors.
Online since: July 2015
Authors: Dorin Simoiu, Liviu Bereteu, Eva Nyaguly, Ion Crâştiu
The same basic factors apply to both weld repair and surfacing.
Parts made of low-carbon and low-alloy steels can be repaired without adversely affecting the service life of the part.
In some cases, a discontinuity can be left in a weld without affecting the weld’s function.
Using Prony’s series method [6-7] and AutoSignal algorithm [8] the mechanical parameters of the system are determined (Table 2).
Nes, Determination of some Mechanical Properties of Welded Reinforcing Steel with Self-shielded Wires by Vibration Tests, Advanced Material Research, 1029 (2014), 206-211
Parts made of low-carbon and low-alloy steels can be repaired without adversely affecting the service life of the part.
In some cases, a discontinuity can be left in a weld without affecting the weld’s function.
Using Prony’s series method [6-7] and AutoSignal algorithm [8] the mechanical parameters of the system are determined (Table 2).
Nes, Determination of some Mechanical Properties of Welded Reinforcing Steel with Self-shielded Wires by Vibration Tests, Advanced Material Research, 1029 (2014), 206-211
Online since: October 2017
Authors: Jindřich Melichar, Ámos Dufka, Tomáš Melichar, Jiří Bydžovský
Resistance of these materials to combination of several adverse factors was observed.
However, there are also situations when more adverse factors can act in synergy.
I the paper [2], the authors focus on research of properties of mortars with blended matrix containing fly ash (type Cl and F), silica fume and metakaolin exposed to sulphate environment for the time up to 30 months.
Subsequently, basic physico-mechanical parameters were tested, mineralogical composition and microstructure examined.
The investigation of microstructure and strength properties of lightweight mortar containing mineral admixtures exposed to sulfate attack, Measurement, Volume 77, January 2016, p. 143-154
However, there are also situations when more adverse factors can act in synergy.
I the paper [2], the authors focus on research of properties of mortars with blended matrix containing fly ash (type Cl and F), silica fume and metakaolin exposed to sulphate environment for the time up to 30 months.
Subsequently, basic physico-mechanical parameters were tested, mineralogical composition and microstructure examined.
The investigation of microstructure and strength properties of lightweight mortar containing mineral admixtures exposed to sulfate attack, Measurement, Volume 77, January 2016, p. 143-154
Online since: August 2013
Authors: Jian Feng Lin, Zhi Tan, Yu Liang Wu, Kuo Liu
The influence factors of machine tool's machining precision are geometric errors, thermal errors and cutting force errors.
ZHANG Yaoman et al[3] analyzed thermal properties of spindle assembly and headstock of machining center and calculated the thermal distort of spindle and headstock.
On the base of the literature above, thermal error test and temperture test are done on a certain machine center's mechanical principal spindle.
Then, temperture begin to be main affect factor of displacements of all directions.
FEA of Thermal Properties of Spindle Assembly and Headstock of Machining Center[J].
ZHANG Yaoman et al[3] analyzed thermal properties of spindle assembly and headstock of machining center and calculated the thermal distort of spindle and headstock.
On the base of the literature above, thermal error test and temperture test are done on a certain machine center's mechanical principal spindle.
Then, temperture begin to be main affect factor of displacements of all directions.
FEA of Thermal Properties of Spindle Assembly and Headstock of Machining Center[J].
Online since: October 2008
Authors: Young Woo Kim, Ju Woong Jang, Tai Joo Chung, Kyung Sik Oh
However, such an
addition of compliant phase usually reduces the mechanical properties.
The mechanical properties of bone cements are dependent on the parameters such as powder to liquid ratio, particle size, composition and so on [2].
In case of the brushite cement, it was shown that the temperature and humidity before setting were important factors controlling properties of cement [3].
It was found that the type of saline solution was an important parameter affecting the porosity of hardened paste and consequent compressive strength.
Conclusions Properties of apatite type bone cement were compared with respect to the concentration of setting agent and types of saline solution used for storage after setting.
The mechanical properties of bone cements are dependent on the parameters such as powder to liquid ratio, particle size, composition and so on [2].
In case of the brushite cement, it was shown that the temperature and humidity before setting were important factors controlling properties of cement [3].
It was found that the type of saline solution was an important parameter affecting the porosity of hardened paste and consequent compressive strength.
Conclusions Properties of apatite type bone cement were compared with respect to the concentration of setting agent and types of saline solution used for storage after setting.
Online since: January 2021
Authors: Yoshikazu Nakai, Shoichi Kikuchi, Kaito Asayama, Hayata Yoshida
Fatigue strength is one of the most important mechanical property to be paid attention for long-life use of transportation system.
Average grain size and mechanical properties.
The average grain size and mechanical properties of the material is indicated in Table 2.
As shown in Fig. 7 (b), Schmid factors of grains adjacent to the crack initiation site are large, and Fig. 7 (a) indicates that the misfit of both side of crack initiation site are also large.
Ninomiya, A study on very high cycle fatigue properties of low flammability magnesium alloy in rotating bending and axial loading, Appl.
Average grain size and mechanical properties.
The average grain size and mechanical properties of the material is indicated in Table 2.
As shown in Fig. 7 (b), Schmid factors of grains adjacent to the crack initiation site are large, and Fig. 7 (a) indicates that the misfit of both side of crack initiation site are also large.
Ninomiya, A study on very high cycle fatigue properties of low flammability magnesium alloy in rotating bending and axial loading, Appl.
Online since: January 2022
Authors: Vladimir Malikov, Victoria Alexandrovna Sokolova, Sergey Voinash, Irina Teterina, Andrei Ivanov, Vitaly Ignatenko, Evgeny Remshev
Mechanical properties of heat-resistant alloys.
The properties of EP648 (SLS) after HIP and aging are given in brackets [6].
The properties of alloys obtained by modes 3 and 4 have rather high strength indices in the initial state, the conditional yield strength of the alloys is equal to or exceeds the analogous properties of the EP 648-VI cast alloy [2,3].
The mechanical properties of the alloy (σv = 1196MPa; δ-14%) obtained by the HIP+aging mode correspond to the literature data. 3.
Mazalov, Investigation of the properties of EP648 alloy obtained by the method of selective laser alloying of metal powders, Works of VIAM 2 (2015) 8-15
The properties of EP648 (SLS) after HIP and aging are given in brackets [6].
The properties of alloys obtained by modes 3 and 4 have rather high strength indices in the initial state, the conditional yield strength of the alloys is equal to or exceeds the analogous properties of the EP 648-VI cast alloy [2,3].
The mechanical properties of the alloy (σv = 1196MPa; δ-14%) obtained by the HIP+aging mode correspond to the literature data. 3.
Mazalov, Investigation of the properties of EP648 alloy obtained by the method of selective laser alloying of metal powders, Works of VIAM 2 (2015) 8-15
Online since: September 2013
Authors: Li Ping Pang, Ying Jie Wang, Dong Sheng Yang
Passenger thermal comfort is one significant aspect in cabin-related issues and it has become a key market competition factor for the civil airline industry.
The reduction of cabin pressure and very low RH at cruise altitude will affect several terms in the bio-heat balance equation.
We assume that the static theory of thermal comfort can be applied to the civil aircraft cabin and all the properties of the individual tissue as well as the insulation properties of garments worn are independent of the air pressure [5], air pressure and RH will mainly impact on the heat loss through skin diffusion and sweating, and heat loss by convection. 1) Heat loss through skin diffusion and sweating The evaporative heat loss from skin (Esk) is defined as [6]: (2) where w is the skin wettedness; Re is clothing water vapour resistance, m2Pa/W; pa is water vapour pressure, Pa; is the saturated water vapour pressure at the skin temperature, Pa
Such a low RH is believed to affect the basal wettedness of the skin, having a normal value of 0.06 which may drop to values as low as 0.02 in a very dry environment.
Personal factors in thermal comfort assessment: clothing properties and metabolic heat production.
The reduction of cabin pressure and very low RH at cruise altitude will affect several terms in the bio-heat balance equation.
We assume that the static theory of thermal comfort can be applied to the civil aircraft cabin and all the properties of the individual tissue as well as the insulation properties of garments worn are independent of the air pressure [5], air pressure and RH will mainly impact on the heat loss through skin diffusion and sweating, and heat loss by convection. 1) Heat loss through skin diffusion and sweating The evaporative heat loss from skin (Esk) is defined as [6]: (2) where w is the skin wettedness; Re is clothing water vapour resistance, m2Pa/W; pa is water vapour pressure, Pa; is the saturated water vapour pressure at the skin temperature, Pa
Such a low RH is believed to affect the basal wettedness of the skin, having a normal value of 0.06 which may drop to values as low as 0.02 in a very dry environment.
Personal factors in thermal comfort assessment: clothing properties and metabolic heat production.
Online since: October 2015
Authors: Andreas Sterzing, Markus Bergmann, Dirk Landgrebe
Most SPD methods are limited to laboratory investigations due to technical and economic factors.
The approach presented in this paper provides a contribution to cope with the limiting factors.
Further EBSD analysis is required as well other approaches to determine material characteristics and mechanical properties.
Mechanical properties were analyzed using hardness measurement.
Further developments will focus on the understanding of the interaction between the geometry of SPD forming elements and the resulting microstructure and mechanical properties.
The approach presented in this paper provides a contribution to cope with the limiting factors.
Further EBSD analysis is required as well other approaches to determine material characteristics and mechanical properties.
Mechanical properties were analyzed using hardness measurement.
Further developments will focus on the understanding of the interaction between the geometry of SPD forming elements and the resulting microstructure and mechanical properties.