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Online since: December 2014
Authors: Ling Ling Cai, Jing Hua Yang, Rong Rong Lu, Guang Xiao Kou, Pei Na Shang
The predominant influence factors in measuring are the dimension of instruments and temperature of the surrounding environment [4].
Different rotors and rotating speeds can be adopted according to the different properties of the liquids to be measured.
Besides, vibrating cycle can also affect the precision of measurement to a great extent [2].
The rotation method combined with advanced mechanical design technology and micro-computer control technology are used.
There are a few factors that need to be considered when we choose the method which is to measure viscosity of HTF.
Different rotors and rotating speeds can be adopted according to the different properties of the liquids to be measured.
Besides, vibrating cycle can also affect the precision of measurement to a great extent [2].
The rotation method combined with advanced mechanical design technology and micro-computer control technology are used.
There are a few factors that need to be considered when we choose the method which is to measure viscosity of HTF.
Online since: July 2011
Authors: Qiang Ma, Jun Jie Zheng, De Pi Luo
However, there are still many factors have influences on the vertical earth pressure of high embankment culvert and load reduction efficiency, including the number of geogrid layers, stiffness of the geogrid reinforcement, the geometry of the load reduction ditch, etc..
Numerical analysis The selectio of the analysis model, including geometric model and material model, will directly affect the accuracy of simulation.
In this paper, physical and mechanical parameters used were listed in Table 1, and the axial tensile stiffness of geogrid EA is 1200kN/m.
Table 1 Physical and mechanical parameters for numerical simulation Material Elastic modulus(MPa) Unit weight(kN/m3) Poisson’s ratio Cohesion(kPa) Friction angle (°) Culvert 30 000 25.2 0.20 - - Silty clay 7.8 17.8 0.33 7.6 19.7 Sand and gravel layers 30 20.1 0.3 0 28.6 Clay 24.1 18.3 0.3 15.7 21 Fill 18 19 0.3 16.8 24.6 Compressible material 2 14.8 0.36 0 28 *The material properties were obtained from the laboratory test.
Numerical analysis The selectio of the analysis model, including geometric model and material model, will directly affect the accuracy of simulation.
In this paper, physical and mechanical parameters used were listed in Table 1, and the axial tensile stiffness of geogrid EA is 1200kN/m.
Table 1 Physical and mechanical parameters for numerical simulation Material Elastic modulus(MPa) Unit weight(kN/m3) Poisson’s ratio Cohesion(kPa) Friction angle (°) Culvert 30 000 25.2 0.20 - - Silty clay 7.8 17.8 0.33 7.6 19.7 Sand and gravel layers 30 20.1 0.3 0 28.6 Clay 24.1 18.3 0.3 15.7 21 Fill 18 19 0.3 16.8 24.6 Compressible material 2 14.8 0.36 0 28 *The material properties were obtained from the laboratory test.
Online since: March 2015
Authors: Xiao Li, Lan Yun Li, Yang Liu, Shao Fei Yang, Yan Hai Geng, Fei Yan Liu, Jing Liu
The material is SS316L with mechanical properties: σs=268MPa, E=210GPa, u=0.3, K=1632, n=0.61.
Actually, springback may be also affected by many factors, which needs further detailed investigations.
Vol.209 (2009), p. 3431 [5] M Bakhshi-Jooybari, M Elyasi and A Gorji, in: Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, 2010 224: 95 DOI: 10.1243/09544054JEM1586
Actually, springback may be also affected by many factors, which needs further detailed investigations.
Vol.209 (2009), p. 3431 [5] M Bakhshi-Jooybari, M Elyasi and A Gorji, in: Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, 2010 224: 95 DOI: 10.1243/09544054JEM1586
Online since: May 2016
Authors: Austin Cox, Theocharis Baxevanis, Dimitris C. Lagoudas
So it is desired to have proper models that predict the properties of SMAs taking into consideration the process routes and heat treatments.
These precipitates significantly influence the martensitic transformation of NiTi due to the following important factors: (i) the stress state around the precipitates, and (ii) the Ni-depletion in the matrix close to the precipitates.
Both affect the formation of the B19’ phase due to stress and composition dependence of the phase transition temperatures [13] influencing thermomechanical properties such as size of hysteresis and Clausius-Clapeyron slopes in addition to residual strains and plastic yield limit.
Blocks of7×26×6mm are cut from the billets with Electrical Discharge Machining (EDM) and then mechanically grounded to remove the EDM-affected surface layer.
The model considers both the structural and chemical effects of the Ni4Ti3 precipitation process, i.e., precipitate volume fraction, differences in elastic properties with the matrix, coherency stresses due to the lattice mismatch between the precipitates and matrix material, and Ni-distribution resulting from Ni-depletion during precipitate growth.
These precipitates significantly influence the martensitic transformation of NiTi due to the following important factors: (i) the stress state around the precipitates, and (ii) the Ni-depletion in the matrix close to the precipitates.
Both affect the formation of the B19’ phase due to stress and composition dependence of the phase transition temperatures [13] influencing thermomechanical properties such as size of hysteresis and Clausius-Clapeyron slopes in addition to residual strains and plastic yield limit.
Blocks of7×26×6mm are cut from the billets with Electrical Discharge Machining (EDM) and then mechanically grounded to remove the EDM-affected surface layer.
The model considers both the structural and chemical effects of the Ni4Ti3 precipitation process, i.e., precipitate volume fraction, differences in elastic properties with the matrix, coherency stresses due to the lattice mismatch between the precipitates and matrix material, and Ni-distribution resulting from Ni-depletion during precipitate growth.
Online since: October 2006
Authors: Won Hak Cho, Hyeon Ki Choi
High-heeled shoes also have shown to affect gait,
particularly at the ankle joint, which is excessively plantar flexed.
Statistical techniques describe the fractal and time evolutionary properties of the COP, and infer additional information about the nature of the postural control system [5, 6] Localized muscle fatigue can be quantified by following the shift in the EMG spectral density towards lower frequencies, using MF of the power spectrum as a guiding parameter [2].
And we also investigated how the high-heeled posture affects on muscle fatigue.
These subjects had no history or evidence of uncorrected neurological or musculoskeletal problems that would adversely affect postural control.
EMG signals were pre-amplified by factors in the range of 1000-4000 (depending on the subject) and captured by a 12-bit A/D board (PLC 818, Scientific Solution Lab, USA) at a sampling rate of 1 kHz.
Statistical techniques describe the fractal and time evolutionary properties of the COP, and infer additional information about the nature of the postural control system [5, 6] Localized muscle fatigue can be quantified by following the shift in the EMG spectral density towards lower frequencies, using MF of the power spectrum as a guiding parameter [2].
And we also investigated how the high-heeled posture affects on muscle fatigue.
These subjects had no history or evidence of uncorrected neurological or musculoskeletal problems that would adversely affect postural control.
EMG signals were pre-amplified by factors in the range of 1000-4000 (depending on the subject) and captured by a 12-bit A/D board (PLC 818, Scientific Solution Lab, USA) at a sampling rate of 1 kHz.
Online since: September 2013
Authors: Jie Zhu, Lei Wang, Qi Rong Lu, Qi Lin Tang, Jian Hui Luo
Introduction
The properties of materials are generally dependent on the material type and composition.
With taking the advantages of great high-temperature drying efficiency of microwave and uniformed temperature distribution of oven, a microwave-oven intelligent control system was designed for hybrid heat treatment, which contains the following factors: (1)putting the wet materials into work warehouse; (2)starting microwave heat treatment program for drying raw materials; (3)changing the program to remove water vapor while the humidity in the warehouse above a certain value or switching to constant temperature air blast (oven mode) heat treatment while the humidity in the warehouse below the set value; (4)detecting the produced gas concentration and completing the heat treatment process when the gas concentration reaches the set value.
The IRTP-300L temperature sensor has the detecting temperature range of -20 ~ 300 oC, response time of 150 ms, and distance coefficient of 8:1 and it is also not affected by environment such as contamination, moisture, and electromagnetic interference [4].
Humidity detection and program switching As one of important parameters for intelligent control of heat treatment, humidity of the environment can directly affect the proper program switching during the heat treatment process and accordingly can affect the quality of product and production efficiency.
Gas concentration detection and program automatic stop As the key parameters for the determination of the heat treatment degree, gas concentration directly affects the success or failure of the product.
With taking the advantages of great high-temperature drying efficiency of microwave and uniformed temperature distribution of oven, a microwave-oven intelligent control system was designed for hybrid heat treatment, which contains the following factors: (1)putting the wet materials into work warehouse; (2)starting microwave heat treatment program for drying raw materials; (3)changing the program to remove water vapor while the humidity in the warehouse above a certain value or switching to constant temperature air blast (oven mode) heat treatment while the humidity in the warehouse below the set value; (4)detecting the produced gas concentration and completing the heat treatment process when the gas concentration reaches the set value.
The IRTP-300L temperature sensor has the detecting temperature range of -20 ~ 300 oC, response time of 150 ms, and distance coefficient of 8:1 and it is also not affected by environment such as contamination, moisture, and electromagnetic interference [4].
Humidity detection and program switching As one of important parameters for intelligent control of heat treatment, humidity of the environment can directly affect the proper program switching during the heat treatment process and accordingly can affect the quality of product and production efficiency.
Gas concentration detection and program automatic stop As the key parameters for the determination of the heat treatment degree, gas concentration directly affects the success or failure of the product.
Online since: April 2012
Authors: Xue Ping Zhang, Xiao Jin Xu, Li Qiang Ding
Introduction
Inconel718 is widely adopted in gas turbines and aircraft engines owing to its high strength properties at high temperature, which is attributable to the hard niobium and titanium carbide phases[1].
Experiments show these brittle particles tend to crack due to the severe deformation during finish machining[2], which affects the surface integrity and accelerates tool wear.
Material properties are usually defined as homogeneous in Inconel718 cutting process FE model.
A plain-strain couple thermo-mechanical analysis is performed to consider the thermal effect in orthogonal cutting Inconel718.
[11] J.Michael Pereira, Bradley, A.Lerch, in: Effects of heat treatment on the ballistic impact properties of Inconel718 for jet engine fan containment applications.
Experiments show these brittle particles tend to crack due to the severe deformation during finish machining[2], which affects the surface integrity and accelerates tool wear.
Material properties are usually defined as homogeneous in Inconel718 cutting process FE model.
A plain-strain couple thermo-mechanical analysis is performed to consider the thermal effect in orthogonal cutting Inconel718.
[11] J.Michael Pereira, Bradley, A.Lerch, in: Effects of heat treatment on the ballistic impact properties of Inconel718 for jet engine fan containment applications.
Online since: September 2021
Authors: Shou Ren Wang, Dong Yue Wang, Rong Chang Xu, Dian Xiu Xia, Ying Chao Pei, Zhi Heng Liu, Zheng Peng Han
Experimental Study on Sliding Friction Properties of GCr15 Bearing Steel [J].
Effect of Ultrasonic Rolling on Surface Properties of GCr15 Materials [D].
Friction and wear properties of Mo Al B against Al 2 O 3 and 100Cr6 steel counterparts[J].
Microstructure, Compression, Contact Fatigue and Wear Properties of a New Type of Bainite Bearing Steel [D].
Analysis of factors influencing dry sliding wear behaviour of Al/SiCpâbrake pad tribosystem[J].
Effect of Ultrasonic Rolling on Surface Properties of GCr15 Materials [D].
Friction and wear properties of Mo Al B against Al 2 O 3 and 100Cr6 steel counterparts[J].
Microstructure, Compression, Contact Fatigue and Wear Properties of a New Type of Bainite Bearing Steel [D].
Analysis of factors influencing dry sliding wear behaviour of Al/SiCpâbrake pad tribosystem[J].
Online since: February 2012
Authors: Min Song, Xue You Shen, Mei Jiao Lin
The review will also focus on the current researches on the degradation of water organic pollutants by using bentonite/TiO2 composite photocatalyst and its key influencing factors.
In the process of preparation of TiO2, calcination temperature affects the crystal of TiO2[51, 52], and further affects the photocatalytic efficiency of the material.
At the same time, various characterization techniques have been used to examine structure properties of bentonite/TiO2 composite.
BET is a common and important method to characterize the specific surface area of materials, which impacts the adsorption properties of adsorbents directly.
In recent years, the high adsorption properties of bentonite has gradually attracted people's attention in the field of environmental purification[58].
In the process of preparation of TiO2, calcination temperature affects the crystal of TiO2[51, 52], and further affects the photocatalytic efficiency of the material.
At the same time, various characterization techniques have been used to examine structure properties of bentonite/TiO2 composite.
BET is a common and important method to characterize the specific surface area of materials, which impacts the adsorption properties of adsorbents directly.
In recent years, the high adsorption properties of bentonite has gradually attracted people's attention in the field of environmental purification[58].
Online since: January 2020
Authors: Wasim M.K. Helal, Xin Rong Cao, Mamoun I.A. Sagiroun, John N. Njoroge
As a result of corrosion on the waterside in the reactor core, fuel cladding oxidation is an important factor affecting the lifetime of the cladding [6].
The first stage taken to develop zirconium alloys was addition of (Sn) to impure zirconium, which lead to overcoming the negative effects of nitrogen content in the alloy to a lesser extent, without seriously affecting the neutron economy [10].
Lemaignan, Zirconium Alloys: Properties and Characteristics.
[15] C.L.Whitmarsh, “Review of Zircaloy-2 and Zircaloy-4 Properties Relevant to NS Savannah Reactor Design.,” Oak Ridge Natl.
Shriwastaw et al., “Estimation of ring tensile properties of steam oxidized Zircaloy-4 fuel cladding under simulated LOCA condition,” J.
The first stage taken to develop zirconium alloys was addition of (Sn) to impure zirconium, which lead to overcoming the negative effects of nitrogen content in the alloy to a lesser extent, without seriously affecting the neutron economy [10].
Lemaignan, Zirconium Alloys: Properties and Characteristics.
[15] C.L.Whitmarsh, “Review of Zircaloy-2 and Zircaloy-4 Properties Relevant to NS Savannah Reactor Design.,” Oak Ridge Natl.
Shriwastaw et al., “Estimation of ring tensile properties of steam oxidized Zircaloy-4 fuel cladding under simulated LOCA condition,” J.