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Online since: January 2010
Authors: Koji Hagihara, Mayumi Mori, Takuya Kishimoto, Yukichi Umakoshi
Many studies
focusing on the mechanical properties of Ni3V compound have been reported [4-7], but the details are
not enough elucidated yet.
Therefore, even if there was an unevenness of the volume fraction of the three variants in the heat-treated specimens, the influence of them on the mechanical properties could be minimaized at this loading orientation.
The difference of the microstructure strongly influenced on the mechanical properties.
The control of variant microstructure is therefore essential to gain the suitable mechanical properties of the alloys.
Conclusions In this study, the control of microstructure in Ni3V single crystals was attempted by annealing at 1473K in disordered state followed by quenching and subsequent annealing, and their mechanical properties were examined by compression tests.
Therefore, even if there was an unevenness of the volume fraction of the three variants in the heat-treated specimens, the influence of them on the mechanical properties could be minimaized at this loading orientation.
The difference of the microstructure strongly influenced on the mechanical properties.
The control of variant microstructure is therefore essential to gain the suitable mechanical properties of the alloys.
Conclusions In this study, the control of microstructure in Ni3V single crystals was attempted by annealing at 1473K in disordered state followed by quenching and subsequent annealing, and their mechanical properties were examined by compression tests.
Online since: April 2015
Authors: Chun Ho Kim, Sang Jun Park, Bon Kang Gu, Min Sup Kim
Especially, pore size and distribution on scaffolds has been observed to significantly affect cell adhesion, migration, and proliferation in vitro and influence the rate and depth of cellular in-growth in vitro and in vivo [2].
Due to its outstanding properties in terms of biocompatibility, biodegradability, non-antigenicity and chelating ability, AL has been widely used in a variety of tissue engineering [4].
Also, Hollister presented that the design of pore structures were critical factor in the scaffolds and the pore structures determined the cellular behaviors in vitro and in vivo conditions [2].
Kim, Inter-connecting pores of chitosan scaffold with basic fibroblast growth factor modulate biological activity on human mesenchymal stem cells, Carbohyd.
Structure, gelation rate and mechanical properties, Biomaterials. 22 (2001) 511-521
Due to its outstanding properties in terms of biocompatibility, biodegradability, non-antigenicity and chelating ability, AL has been widely used in a variety of tissue engineering [4].
Also, Hollister presented that the design of pore structures were critical factor in the scaffolds and the pore structures determined the cellular behaviors in vitro and in vivo conditions [2].
Kim, Inter-connecting pores of chitosan scaffold with basic fibroblast growth factor modulate biological activity on human mesenchymal stem cells, Carbohyd.
Structure, gelation rate and mechanical properties, Biomaterials. 22 (2001) 511-521
Online since: October 2004
Authors: Fang Hong Sun, Xiao Gang Jian, Ming Chen, Y.P. Ma, Zhi Ming Zhang
Zhang
School of Mechanical Engineering, Shanghai Jiao Tong University, 200030 Shanghai, China
a
jianxgg@sjtu.edu.cn
Keywords: Diamond Thin Film, Tungsten Carbide Substrates, WC Grain Size
Abstract.
Different trademarks of tungsten carbide materials have different chemical component, grain size and mechanical performance and are adoptable to different engineering fields.
Among all factors influencing the performances of tungsten carbide materials, grain size may become more attentive one.
Table 1 Chemical compositions and properties of WC-Co substrates WC-Co Average size of Nominal composition Density Hardness Transverse rupture grade WC powder[µm] [wt.%] [g·cm-3] [HRA] strength [MPa] 1(K01) 0.5 94%WC-6%Co 14.85 93.0 2700 2(K10) 1.5 94%WC-6%Co 14.95 91.5 2500 3(K20) 3.0 94%WC-6%Co 14.95 91.0 2600 Results and Discussion Pretreatment and Effect of WC Grain Size on Substrate Pretreatment.
Conclusions These results indicated that the WC grain size of substrate plays an important role in determining the performance of diamond coatings by affecting the adhesion of diamond coatings to the WC-Co substrate and the surface roughness of diamond coatings, and there existed tightness relations among them, which were very important for the selection of raw tungsten carbide materials for the fabrication of diamond-coated tools.
Different trademarks of tungsten carbide materials have different chemical component, grain size and mechanical performance and are adoptable to different engineering fields.
Among all factors influencing the performances of tungsten carbide materials, grain size may become more attentive one.
Table 1 Chemical compositions and properties of WC-Co substrates WC-Co Average size of Nominal composition Density Hardness Transverse rupture grade WC powder[µm] [wt.%] [g·cm-3] [HRA] strength [MPa] 1(K01) 0.5 94%WC-6%Co 14.85 93.0 2700 2(K10) 1.5 94%WC-6%Co 14.95 91.5 2500 3(K20) 3.0 94%WC-6%Co 14.95 91.0 2600 Results and Discussion Pretreatment and Effect of WC Grain Size on Substrate Pretreatment.
Conclusions These results indicated that the WC grain size of substrate plays an important role in determining the performance of diamond coatings by affecting the adhesion of diamond coatings to the WC-Co substrate and the surface roughness of diamond coatings, and there existed tightness relations among them, which were very important for the selection of raw tungsten carbide materials for the fabrication of diamond-coated tools.
Online since: December 2014
Authors: Yi Tang Zhou, Xin Lou, Jian Rong Yang, Zhi Qiang Chen
Houtian Hu [4] is based on the field test, analyzed the influence factors of rockfall movement, such as size, shape and slope conditions etc.
According to the domestic and foreign research data, such as Shunchuan Wu [5], based on the orthogonal test to study the factors affecting the motion characteristics.
(5) Where, VEXIT for the Rolling Stones to leave this section of the final slope surface speed; V0 for the rockfall cut side slope along the current direction of the initial velocity; S for the rockfall on the slope of the sliding distance of this paragraph; g is the gravity acceleration; k is a factor[7].
The case study Engineering situation Within the scope of the rockfall disease treatment engineering of some Railway Bureau, in order to solve the existing railway on the simple and quick, safe and effective construction of shed structure, put forward the light shed structure (shown in Fig.2) .The mechanical parameters of material properties of light shed structure is shown in Table 1.
Material properties Component E(Pa) ρ(kg/m3) Yield Strength(Pa) μ rockfall 3.25E+10 2600 - - main cable 2.06E+11 7850 1.55E+09 0.3 wire 2.06E+11 7850 1.55E+09 0.3 spring damping bar 2.06E+11 7850 1.90E+08 0.3 The calculation model of impact This paper uses the general explicit dynamic analysis design of the light shed structure of the program ANSYS/LS-DYNA for numerical simulation of rockfall dynamic impact process.
According to the domestic and foreign research data, such as Shunchuan Wu [5], based on the orthogonal test to study the factors affecting the motion characteristics.
(5) Where, VEXIT for the Rolling Stones to leave this section of the final slope surface speed; V0 for the rockfall cut side slope along the current direction of the initial velocity; S for the rockfall on the slope of the sliding distance of this paragraph; g is the gravity acceleration; k is a factor[7].
The case study Engineering situation Within the scope of the rockfall disease treatment engineering of some Railway Bureau, in order to solve the existing railway on the simple and quick, safe and effective construction of shed structure, put forward the light shed structure (shown in Fig.2) .The mechanical parameters of material properties of light shed structure is shown in Table 1.
Material properties Component E(Pa) ρ(kg/m3) Yield Strength(Pa) μ rockfall 3.25E+10 2600 - - main cable 2.06E+11 7850 1.55E+09 0.3 wire 2.06E+11 7850 1.55E+09 0.3 spring damping bar 2.06E+11 7850 1.90E+08 0.3 The calculation model of impact This paper uses the general explicit dynamic analysis design of the light shed structure of the program ANSYS/LS-DYNA for numerical simulation of rockfall dynamic impact process.
Online since: September 2013
Authors: Jian Wu Lan, Jiao Jiao Shang, Ming Lei, Shao Jian Lin, Xia Huang, Wen He
The thermal properties and solubility of the novel CPIs were investigated.
The thermal properties of CPI-4 were evaluated by DSC and TGA.
The data of thermal properties of all polymers were summarized in Table 2.
Therefore, all of the CPIs showed appropriate thermal properties.
Synthesis and properties.
The thermal properties of CPI-4 were evaluated by DSC and TGA.
The data of thermal properties of all polymers were summarized in Table 2.
Therefore, all of the CPIs showed appropriate thermal properties.
Synthesis and properties.
Online since: October 2015
Authors: Anirut Chaijaruwanich, Chanyapat Khamkasem
Characteristics of green tapes are strongly dependent on rheological properties of slurry.
Effects of viscosity, dispersant content on physical and mechanical properties of green and sintered HA tape cast sheets were studied [2].
The values of factors: A, B and C are written in coded values and true values in brackets.
It indicated that all factors; the viscosity, the blade height and the speed, had an effect on both flexural strength and density.
Chaijaruwanich, Effect of binder/plasticizer ratios in aqueous-based tape casting on mechanical properties of bovine hydroxyapatite tape, Ferroelectrics 455 (2013) 129-135
Effects of viscosity, dispersant content on physical and mechanical properties of green and sintered HA tape cast sheets were studied [2].
The values of factors: A, B and C are written in coded values and true values in brackets.
It indicated that all factors; the viscosity, the blade height and the speed, had an effect on both flexural strength and density.
Chaijaruwanich, Effect of binder/plasticizer ratios in aqueous-based tape casting on mechanical properties of bovine hydroxyapatite tape, Ferroelectrics 455 (2013) 129-135
Online since: February 2014
Authors: Pavol Mikula, Miroslav Vrána, Lubos Mraz, Leif Karlsson
Fatigue properties have also been evaluated for all test welds.
The effect of residual stress is discussed in relation to fatigue properties of all four welds.
Several factors influence the level of the residual stresses in the vicinity of the weld area.
It means that not only technological parameters or material properties but also metallurgical effects can influence the level and distribution of residual stresses.
These results confirm published observations that residual stress is one of the important factors which influence fatigue strength of high strength steels welds.
The effect of residual stress is discussed in relation to fatigue properties of all four welds.
Several factors influence the level of the residual stresses in the vicinity of the weld area.
It means that not only technological parameters or material properties but also metallurgical effects can influence the level and distribution of residual stresses.
These results confirm published observations that residual stress is one of the important factors which influence fatigue strength of high strength steels welds.
Online since: October 2012
Authors: M. Mohan Reddy, Khaled A. Abou-El-Hossein, Alexander Gorin, D. Sujan, Md Abdul Maleque, Yeakub Ali Mohammad
Advanced ceramics has become an attractive material in various types of application such as aerospace, automobile, electronic, machining tools and biological industrial due to their inherent properties such as high hardness, high strength at elevated temperature, high wear resistance, good electrical insulators, high thermal conductivity and chemical inertness.
Due to their superior properties, advanced ceramics are hard to be machined with conventional machining methods [1].
However, limited knowledge is available on the tool wear behaviour as well as its influential factors on advanced ceramics in end milling.
In Response surface method (RSM) the experiments are performed using CCD to develop a second order model as: R = b0+b1 A+b2B+b3C+b11 A2 +b22 B2+b33 C2+b12 AB+b21 AB+ b23 BC+b13 AC+b32 BC+b31 AC (1) Where R is response and A, B, and C are the different machining factors.
Significance of factors and their interactions can be computed using statistical analysis.The machining parameters and their selected levels are shown in Table 2.
Due to their superior properties, advanced ceramics are hard to be machined with conventional machining methods [1].
However, limited knowledge is available on the tool wear behaviour as well as its influential factors on advanced ceramics in end milling.
In Response surface method (RSM) the experiments are performed using CCD to develop a second order model as: R = b0+b1 A+b2B+b3C+b11 A2 +b22 B2+b33 C2+b12 AB+b21 AB+ b23 BC+b13 AC+b32 BC+b31 AC (1) Where R is response and A, B, and C are the different machining factors.
Significance of factors and their interactions can be computed using statistical analysis.The machining parameters and their selected levels are shown in Table 2.
Online since: September 2017
Authors: Ping Cai, Dian Wang, Zhi Yong Mao
Introduction
Pressure ulcer results from a combination of factors of which the main cause is unrelieved contact stresses between the cushion and the human body [1, 2, 3 and 4].
The objective of this study is to design the parameters of that two-phase mixture cushion via investigating the factors that affect the pressure-relieved performance of this new pressure ulcer-preventing cushion, and those factors includes the filling ratio, the thickness of the cushion, the radius of the beads and the porosity of cushion.
The hyperelastic property and the isotropic elastic property are used to describe the mechanism behaviors the human soft tissue and the cushion, respectively.
Pressure Ulcer Risk Factors Among Hospitalized Patients With Activity Limitation.
A contribution to the mechanical and geometrical study of non-cohesive masses[C].
The objective of this study is to design the parameters of that two-phase mixture cushion via investigating the factors that affect the pressure-relieved performance of this new pressure ulcer-preventing cushion, and those factors includes the filling ratio, the thickness of the cushion, the radius of the beads and the porosity of cushion.
The hyperelastic property and the isotropic elastic property are used to describe the mechanism behaviors the human soft tissue and the cushion, respectively.
Pressure Ulcer Risk Factors Among Hospitalized Patients With Activity Limitation.
A contribution to the mechanical and geometrical study of non-cohesive masses[C].
Online since: February 2014
Authors: Christopher E. Truman, Julian D. Booker, Johnpaul Woodhead, Vadim Davydov
The precise material properties of the composite liner is commercially sensitive information and therefore are not included here.
Table 1 Mechanical properties for the outer race material Carbon Manganese Steel Mechanical Properties Property Symbol Value 0.2% Proof Stress σy 0.518 [GPa] Poisson’s Ratio ν 0.29 Young’s Modulus E 186 [GPa] Strength Coefficient K 1.394 [GPa] Strain-hardening Exponent n 0.33 Brinell Hardness HB 201-255 In this cold-forming process [1,2] the outer race is nosed on each side whereby it is placed, together with the inner race and composite liner, in between two identical spherical dies (Fig. 2-a).
Incorrect pressure, displacement (shut height of the machine press), number of cycles (i.e. the number of consecutive times the press will lower), machine specifications and pre-form design are just a few contributing factors.
The type of part and mesh properties are detailed in Table 2.
Materials Uni-axial compression tests have been performed to characterise the mechanical properties of the carbon manganese steel, of which the outer race is manufactured, and these properties have been input to the FE model created using Abaqus.
Table 1 Mechanical properties for the outer race material Carbon Manganese Steel Mechanical Properties Property Symbol Value 0.2% Proof Stress σy 0.518 [GPa] Poisson’s Ratio ν 0.29 Young’s Modulus E 186 [GPa] Strength Coefficient K 1.394 [GPa] Strain-hardening Exponent n 0.33 Brinell Hardness HB 201-255 In this cold-forming process [1,2] the outer race is nosed on each side whereby it is placed, together with the inner race and composite liner, in between two identical spherical dies (Fig. 2-a).
Incorrect pressure, displacement (shut height of the machine press), number of cycles (i.e. the number of consecutive times the press will lower), machine specifications and pre-form design are just a few contributing factors.
The type of part and mesh properties are detailed in Table 2.
Materials Uni-axial compression tests have been performed to characterise the mechanical properties of the carbon manganese steel, of which the outer race is manufactured, and these properties have been input to the FE model created using Abaqus.