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Online since: July 2011
Authors: Sheng Hua Lv, Ming Ming Hou
Test for Ts and Mechanical properties of leather.
Results and discuss Effects of influencing factors on applied properties of copolymer.
Effects of influencing factors on applied properties of copolymer.
The results show that they can affect the physical properties of leather distinctly.
The good fullness, exquisite surface and excellent mechanical properties of leather are obtained by the syntan of GA-SHBS.
Results and discuss Effects of influencing factors on applied properties of copolymer.
Effects of influencing factors on applied properties of copolymer.
The results show that they can affect the physical properties of leather distinctly.
The good fullness, exquisite surface and excellent mechanical properties of leather are obtained by the syntan of GA-SHBS.
Online since: April 2009
Authors: Davide Cozzoli, Niranjan Patra, Alberto C. Barone, Marco Salerno, Gianvito Caputo, Athanassia Athanassiou
The efficacy of nanoimprint lithography techniques applied on thin films of these
nanocomposites greatly depends on process steps that involve compression, elongation and
viscoelastic properties of the materials that are used.
On the other hand contact mode operation was not required as all the mechanical properties of interest were measured by the complementary nanoindentation setup.
The preliminary surface investigation by means of AFM permitted to ensure that the RMS of the samples is low enough to avoid major influence on the evaluation of their mechanical properties [7].
Anyway, all the factors which usually affect the nanoindentation measurements (i.e. calibration procedure, electromechanical noise, tip blunting etc.), and consequently the physical quantities calculated in the present very low-load nanoindentation tests may result somewhat enhanced [6].
This effect is reasonable, as the occurrence of larger NRs aggregates occasionally affecting the measured surface area becomes more probable in the larger scans on increasing Φ.
On the other hand contact mode operation was not required as all the mechanical properties of interest were measured by the complementary nanoindentation setup.
The preliminary surface investigation by means of AFM permitted to ensure that the RMS of the samples is low enough to avoid major influence on the evaluation of their mechanical properties [7].
Anyway, all the factors which usually affect the nanoindentation measurements (i.e. calibration procedure, electromechanical noise, tip blunting etc.), and consequently the physical quantities calculated in the present very low-load nanoindentation tests may result somewhat enhanced [6].
This effect is reasonable, as the occurrence of larger NRs aggregates occasionally affecting the measured surface area becomes more probable in the larger scans on increasing Φ.
Online since: September 2014
Authors: Daniela Ciancio, Giovanni Castellazzi, Francesco Ubertini
A recent study [2] has discussed the accuracy of the nodal elastic stresses of zero thickness
interface elements when fictitious elastic parameters (often called penalty stiffness factors) are used.
All masonry configurations possess highly anisotropic mechanical properties due to the presence of discrete sets of mortar joints.
Mechanical properties are set as follows: Young's modulus E = 20200N/mm2, Poisson's ratio ν = 0.2 and the interface stiffnesses are set equal to: Kn = 2.0N/mm3 and Kt = 0.9N/mm3.
(a) real geometry (b) interface model (c) corrections Fig. 3: Test 2 - Rubble masonry: first activated interface Summary In this work, the corrections factors for the fictitious elastic stiffness of zero-thickness interface elements has been applied to a stone masonry wall.
The numerical Finite Element Analysis carried out on a full rubble masonry panel shows that, when no correction factors are used, the recovered nodal inter-element stresses led to a different cracking pattern.
All masonry configurations possess highly anisotropic mechanical properties due to the presence of discrete sets of mortar joints.
Mechanical properties are set as follows: Young's modulus E = 20200N/mm2, Poisson's ratio ν = 0.2 and the interface stiffnesses are set equal to: Kn = 2.0N/mm3 and Kt = 0.9N/mm3.
(a) real geometry (b) interface model (c) corrections Fig. 3: Test 2 - Rubble masonry: first activated interface Summary In this work, the corrections factors for the fictitious elastic stiffness of zero-thickness interface elements has been applied to a stone masonry wall.
The numerical Finite Element Analysis carried out on a full rubble masonry panel shows that, when no correction factors are used, the recovered nodal inter-element stresses led to a different cracking pattern.
Online since: September 2007
Authors: Chai Feng, Su Hang, Xu Zhou, Cai Fu Yang, Yong Quan Zhang
The as-received base plate was previously austenized at 900°C for 120 minutes and quenched for microstructure refinement and aged at 650°C for 250 minutes for
optimum toughness and desired mechanical properties combination development.
The composition of the steel and welding wire, and the mechanical properties of the steel are given in table 1 and 2, respectively.
Table 1 Composition of experimental steel and welding wire (wt %) C Si Mn P S Ni Cr Cu Mo Nb H Plate 0.060 0.17 0.53 0.010 0.016 0.85 0.73 1.31 0.22 0.022 / Wire 0.060 0.32 1.76 0.007 0.006 1.60 / / 0.50 / 0.0007 Table 2 Mechanical properties of experimental steel σs (MPa) σb (MPa) δ5 (%) Ψ (%) Charpy impact energy, Akv, -40°C (J) 615 620 685 680 23 24 79 80 255 Results and discussion Generation of welding delayed cracking is well known as a result of a combination of the following three factors: hardenability characteristic of the base metal, constrain level of the joint and diffusion hydrogen content of weld metal [5].
Diffusion hydrogen content, as one of the main factors affected the cold cracking depends on the environmental humidity.
Humidity refers to relative humidity (RH) and absolute humidity (AH), and it is absolute humidity that affected cold cracking in the course of welding.
The composition of the steel and welding wire, and the mechanical properties of the steel are given in table 1 and 2, respectively.
Table 1 Composition of experimental steel and welding wire (wt %) C Si Mn P S Ni Cr Cu Mo Nb H Plate 0.060 0.17 0.53 0.010 0.016 0.85 0.73 1.31 0.22 0.022 / Wire 0.060 0.32 1.76 0.007 0.006 1.60 / / 0.50 / 0.0007 Table 2 Mechanical properties of experimental steel σs (MPa) σb (MPa) δ5 (%) Ψ (%) Charpy impact energy, Akv, -40°C (J) 615 620 685 680 23 24 79 80 255 Results and discussion Generation of welding delayed cracking is well known as a result of a combination of the following three factors: hardenability characteristic of the base metal, constrain level of the joint and diffusion hydrogen content of weld metal [5].
Diffusion hydrogen content, as one of the main factors affected the cold cracking depends on the environmental humidity.
Humidity refers to relative humidity (RH) and absolute humidity (AH), and it is absolute humidity that affected cold cracking in the course of welding.
Online since: April 2013
Authors: Olga Ivanova, Sergey Krutovertsev, Alla Tarasova, Larisa Krutovertseva
Factors that have effect on sol preparation and films forming were investigated.
The developed technology of multistep temperature treatment allowed film properties stabilizing.
Their redox properties can be altered within broad limits through changing the heteropolyanion composition.
This fact results in intra-molecular redox reaction which sharply change electrophysical properties of polyoxometalate.
There are many technological factors that have an influence on adsorption value of films, such as: solution content, film formation conditions, temperature influence and technological environment effect.
The developed technology of multistep temperature treatment allowed film properties stabilizing.
Their redox properties can be altered within broad limits through changing the heteropolyanion composition.
This fact results in intra-molecular redox reaction which sharply change electrophysical properties of polyoxometalate.
There are many technological factors that have an influence on adsorption value of films, such as: solution content, film formation conditions, temperature influence and technological environment effect.
Online since: December 2012
Authors: Yong Tao Gao, Chong Xian Liu
The Selection of Physical and Mechanical Parameters.The selection of the physical and mechanical parameters of rock and soil importantly affect the numerical analysis.Over field engineering geolog ical survey and mapping, drilling, in situ testing, combined with some of the laboratory test data and referring to the past experience in analog engineering analysis to determine the physical and mechanical parameters.
Table 1 Physical and mechanical parameters of the rock and soil mass of slope.
Fig.5 Picture of max shear strain distribution of primary excavation of north wallslope The main reason of occurring the results of Figure 5 is that North Slope in the first mining district of the East open pit is formed by a thick layer of silty soil and silty clay, its stability is mainly controlled by the mechanical properties of the soil, especially red silty clay (red clay).Its special physical and mechanical properties, vertical fissures, vertical permeability is greater than the horizontal permeability coefficient, and groundwater is easily gathered here.
By backpressure treatment in platform1330 to 1348, slope safety factor increased to 1.1856, and the upper soil layer of slope maintained good stability.
Considering the differences of parameters of rock mass in the collapse column within the affected areas and external one was necessary.
Table 1 Physical and mechanical parameters of the rock and soil mass of slope.
Fig.5 Picture of max shear strain distribution of primary excavation of north wallslope The main reason of occurring the results of Figure 5 is that North Slope in the first mining district of the East open pit is formed by a thick layer of silty soil and silty clay, its stability is mainly controlled by the mechanical properties of the soil, especially red silty clay (red clay).Its special physical and mechanical properties, vertical fissures, vertical permeability is greater than the horizontal permeability coefficient, and groundwater is easily gathered here.
By backpressure treatment in platform1330 to 1348, slope safety factor increased to 1.1856, and the upper soil layer of slope maintained good stability.
Considering the differences of parameters of rock mass in the collapse column within the affected areas and external one was necessary.
Online since: June 2010
Authors: Yu Zhang, Xue Xia Yang, Xue Feng Shu
The
solder joint geometry plays an important role among the factors that affect solder joint fatigue
performance [1].
Considering solder joints shape parameters including height, diameter, solder outline and contact angle, it is not comprehensive to consider separately the height as the single factor affecting the ability of solder joints to resist thermal fatigue.
But the mechanical properties of LF solder joints during the thermal cycling test are not as well-studied as SP solders.
The model includes molding compound (MC), a chip, a BT substrate, top Cu pads, bottom Cu pads, solder joints and PCB which all have their unique material properties as shown in Table 2 [6, 7].
The material properties of the eutectic 63Sn/37Pb solder, the hypoeutectic 96.5Sn/3.0Ag/0.5Cu and the PCB were all dependent with temperature.
Considering solder joints shape parameters including height, diameter, solder outline and contact angle, it is not comprehensive to consider separately the height as the single factor affecting the ability of solder joints to resist thermal fatigue.
But the mechanical properties of LF solder joints during the thermal cycling test are not as well-studied as SP solders.
The model includes molding compound (MC), a chip, a BT substrate, top Cu pads, bottom Cu pads, solder joints and PCB which all have their unique material properties as shown in Table 2 [6, 7].
The material properties of the eutectic 63Sn/37Pb solder, the hypoeutectic 96.5Sn/3.0Ag/0.5Cu and the PCB were all dependent with temperature.
Online since: July 2013
Authors: Anthony J. DeArdo, C. Isaac Garcia, Ming Jian Hua, Xiao Jun Liang
In the future, improved modeling of microstructural evolution and attendant mechanical properties will incorporate these important features.
In the future, improved modeling of microstructural evolution and attendant mechanical properties will incorporate these important features.
Mechanical Properties.
It is thought to be another factor affecting toughness of steel depending on its volume fraction, size and morphology.
In the future, improved modeling of microstructural evolution and attendant mechanical properties will incorporate these important microstructural features.
In the future, improved modeling of microstructural evolution and attendant mechanical properties will incorporate these important features.
Mechanical Properties.
It is thought to be another factor affecting toughness of steel depending on its volume fraction, size and morphology.
In the future, improved modeling of microstructural evolution and attendant mechanical properties will incorporate these important microstructural features.
Online since: January 2012
Authors: Yong Hui Zhou, Jun Zhao, Z.Q. Pei, Xiao Bing Cui
Pei1, d
1 Key Laboratory of High Efficiency and Clean Mechanical Manufacture of MOE, School of Mechanical Engineering, Shandong University, Jinan 250061, P.
The material properties of them are listed in Table 1.
Table 1 Properties of the tool materials Tools Flexural strength sf [Mpa] Fracture toughness KIc [MPa×m1/2] Vicker’s hardness HV [Gpa] Young’s modulus E [Gpa] SG-4 870 5.15 21.7 436 AWT-10 930 7.55 23.5 469 Turning Experiments.
The cutting parameters of orthogonal and single factor tests are shown in Table 2.
Table 2 Cutting parameters of orthogonal and single factor intermittent turning tests Exp. no.
The material properties of them are listed in Table 1.
Table 1 Properties of the tool materials Tools Flexural strength sf [Mpa] Fracture toughness KIc [MPa×m1/2] Vicker’s hardness HV [Gpa] Young’s modulus E [Gpa] SG-4 870 5.15 21.7 436 AWT-10 930 7.55 23.5 469 Turning Experiments.
The cutting parameters of orthogonal and single factor tests are shown in Table 2.
Table 2 Cutting parameters of orthogonal and single factor intermittent turning tests Exp. no.
Online since: October 2010
Authors: De Dong Gao, Hao Jun Zheng
Needle deflection and soft tissue deformation are the most important factors that affect
accuracy in needle insertion.
The anisotropic properties of the soft tissue lead to the different stiffness coefficients on the needle shaft.
At time slice i, the needle tip gets to node i and the nodes from 1 to i-1 are affected by the soft tissue's reaction.
The deflection of the needle is the superposition of those two factors.
During the simulation process, the soft tissue is regarded as symmetry and its properties are constants (The Young's modulus is 2.53Pa and the Poisson's ratio is 0.48).
The anisotropic properties of the soft tissue lead to the different stiffness coefficients on the needle shaft.
At time slice i, the needle tip gets to node i and the nodes from 1 to i-1 are affected by the soft tissue's reaction.
The deflection of the needle is the superposition of those two factors.
During the simulation process, the soft tissue is regarded as symmetry and its properties are constants (The Young's modulus is 2.53Pa and the Poisson's ratio is 0.48).