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Online since: December 2011
Authors: Chang Yu Zhou, Jian Peng, Xiao Hua He, Qiao Dai, Ji Lin Xue
Because these components are designed to be used over a long-term period at high temperature, one of the most critical properties in their design is time-dependent creep behavior [3].
A material constitutive model needs to be proposed to consider all these factors.
For a design application and a failure criterion for the components servicing at high temperature, the limitation of a strain may be an important factor for ensuring the structural integrity or functional capability of a component [5].
The determination of limit load at high temperature is different with that at room temperature, and the servicing life factor must be considered.
Peng: Creep stress analyses affected by defect geomentries on P91 pipe with local wall thinning under high temperature, The 18th international conference on nuclear engineering, Xi’an, China (2010)
A material constitutive model needs to be proposed to consider all these factors.
For a design application and a failure criterion for the components servicing at high temperature, the limitation of a strain may be an important factor for ensuring the structural integrity or functional capability of a component [5].
The determination of limit load at high temperature is different with that at room temperature, and the servicing life factor must be considered.
Peng: Creep stress analyses affected by defect geomentries on P91 pipe with local wall thinning under high temperature, The 18th international conference on nuclear engineering, Xi’an, China (2010)
Online since: August 2013
Authors: Jin Sheng Fu, Guo Zhan Luo, Peng Yan
Planning Phase
The possibility of establishing a highway construction project depends on the existing traffic and transport situation, construction conditions, the impact on the natural environment and social environment, sources of funding, and other factors.
Along with time and the change of environment, the influencing factors of highway will change accordingly.
Roadbed design is mainly affected by cross roads, railways, rivers, pedestrian pathways, etc.
Steel slag and fly ash application technology: because steel slag contains various oxides and minerals which have similar physical and chemical composition of Portland cement clinker, steel slag aggregate has better mechanical properties than rolling gravel, not only wearable, but also with a certain degree of hydration activity, it is suitable as asphalt mixture aggregate and primary aggregate[1].
Along with time and the change of environment, the influencing factors of highway will change accordingly.
Roadbed design is mainly affected by cross roads, railways, rivers, pedestrian pathways, etc.
Steel slag and fly ash application technology: because steel slag contains various oxides and minerals which have similar physical and chemical composition of Portland cement clinker, steel slag aggregate has better mechanical properties than rolling gravel, not only wearable, but also with a certain degree of hydration activity, it is suitable as asphalt mixture aggregate and primary aggregate[1].
Online since: September 2013
Authors: Hong Jun Wang, Xiang Jun Zou, Yan Chen, Guo Gang Huang
Motion control’s mathematic models for the picking manipulator were analyzed according to drive motor performance for the body structure, and then the partial differential equations were transformed into the ordinary differential equation easily solved by Modelica with the Laplace transform, mechanical motion simulation was realized.
But the present statue of picking banana is still rest on the phase of relatively backward artificial mode, of which the disadvantages contain larger labor amount; lower efficiency and higher picking costs, as well as bringing body hurt to people working at picking operation, injury to banana epidermis, and affecting seriously the banana harvest quality.
Considering the aim of picking bananas manipulator is to reduce labor intensity, avoid complex motion control and seek simple structures, but requiring a certain degree of stiffness and strength properties, Fig. 1 is the structural diagram of picking bananas manipulator.
the Mathematical Model of a Driver Motor A DC servo motor possesses simple physical structure, the main factor of infecting its running performance is inductive potential.
But the present statue of picking banana is still rest on the phase of relatively backward artificial mode, of which the disadvantages contain larger labor amount; lower efficiency and higher picking costs, as well as bringing body hurt to people working at picking operation, injury to banana epidermis, and affecting seriously the banana harvest quality.
Considering the aim of picking bananas manipulator is to reduce labor intensity, avoid complex motion control and seek simple structures, but requiring a certain degree of stiffness and strength properties, Fig. 1 is the structural diagram of picking bananas manipulator.
the Mathematical Model of a Driver Motor A DC servo motor possesses simple physical structure, the main factor of infecting its running performance is inductive potential.
Online since: June 2008
Authors: Bernhard Wielage, Thomas Lampke, Thomas Grund
Coating properties, like microhardness,
porosity and crack density, gas content or phase distribution, strongly affect the operating behaviour
and have to be displayed systematically.
Corrosion properties.
Wear properties - Abrasive wear.
Wear properties - Oscillating and sliding wear.
Höhle: Corrosion properties of X HVOF titanium coatings.
Corrosion properties.
Wear properties - Abrasive wear.
Wear properties - Oscillating and sliding wear.
Höhle: Corrosion properties of X HVOF titanium coatings.
Online since: February 2012
Authors: Martin Bäker, Aviral Shrot
A scale factor of 3000 was arrived at by this method and has been used for all the simulations in this paper.
The material properties used in the simulation are shown in Table 1.
The thermal properties (Equation 4) of the material are taken from literature [7-9] and are used in a tabular form.
Table 1: Material properties for HY-100 Steel [7-9] Density [kg/m3] Young's Modulus [GPa] Poisson's Ratio 7860 205 0.28 Table 2: Johnson-Cook material parameters for HY-100 Steel [7-9] A [MPa] B [MPa] n C m Tmelt [K] Troom [K] [s-1] 316 1067 0.107 0.0277 0.7 1500 300 3300 The simulation was carried out for 4.80 ms and a total of 1000 frames were recorded.
Garrett, The mechanical threshold stress constitutive-strength model description of HY-100 steel, Met.
The material properties used in the simulation are shown in Table 1.
The thermal properties (Equation 4) of the material are taken from literature [7-9] and are used in a tabular form.
Table 1: Material properties for HY-100 Steel [7-9] Density [kg/m3] Young's Modulus [GPa] Poisson's Ratio 7860 205 0.28 Table 2: Johnson-Cook material parameters for HY-100 Steel [7-9] A [MPa] B [MPa] n C m Tmelt [K] Troom [K] [s-1] 316 1067 0.107 0.0277 0.7 1500 300 3300 The simulation was carried out for 4.80 ms and a total of 1000 frames were recorded.
Garrett, The mechanical threshold stress constitutive-strength model description of HY-100 steel, Met.
Online since: August 2015
Authors: Filipe Pereira, Martin Williams
All the factors above are crucial for the runner design process and can be considered as points of departure.
The 356 alloy choice was premeditated because one off the aspects of this research project is the evaluation of the claimed non wet ability or soldering properties of the material under investigation as well possibilities of processing other alloys with low iron content in HPDC.
Hardness Rockwell C machine was used to measure hardness, readings were taken on both inserts on areas affected or close to where melt heat induced cyclic temperature occurs, prior and after experimentation.
Economic feasibility constraints or extra cost required for adoption of Anviloy in die construction indicates that the methodology should be considered for components with higher complexity, low or minimum porosity and higher specification mechanical properties.
Future work on adoption of squeeze laminar flow gate speeds allied to the low porosity and non-wettability properties of Anviloy will evaluate both the possible processing of alloys with low iron content, wrought alloys and cast components that can undergo heat treatment.
The 356 alloy choice was premeditated because one off the aspects of this research project is the evaluation of the claimed non wet ability or soldering properties of the material under investigation as well possibilities of processing other alloys with low iron content in HPDC.
Hardness Rockwell C machine was used to measure hardness, readings were taken on both inserts on areas affected or close to where melt heat induced cyclic temperature occurs, prior and after experimentation.
Economic feasibility constraints or extra cost required for adoption of Anviloy in die construction indicates that the methodology should be considered for components with higher complexity, low or minimum porosity and higher specification mechanical properties.
Future work on adoption of squeeze laminar flow gate speeds allied to the low porosity and non-wettability properties of Anviloy will evaluate both the possible processing of alloys with low iron content, wrought alloys and cast components that can undergo heat treatment.
Online since: June 2015
Authors: E.N. Popova, I.L. Deryagina, E.I. Patrakov, E.G. Valova-Zaharevskaya
.% [7] and the highest properties are achieved near stoichiometry.
Long high-temperature heat treatments negatively affect the nanocrystalline structure of superconducting layers causing grain growth.
Specimens for TEM studies were prepared as thin foils of longitudinal sections of the wires by mechanical thinning and further chemical etching.
However, this composite demonstrates the lowest Ic (75 A), which testifies that the critical current is affected much more by the internal structure and morphology of superconducting layers than by their thickness.
Critical currents of the wires with ring Nb filaments annealed by various regimes versus average grain sizes of superconducting Nb3Sn phase Thus, the analysis of structure and morphology of superconducting Nb3Sn layers in composites with ring filaments, based on TEM and SEM data, has shown that the critical current of the superconductors is affected by a number of factors, such as the completeness of Nb filaments transformation into Nb3Sn (the residual Nb amount), morphology of superconducting layers (the presence or absence of columnar grains), average grain sizes of Nb3Sn and grain size scattering.
Long high-temperature heat treatments negatively affect the nanocrystalline structure of superconducting layers causing grain growth.
Specimens for TEM studies were prepared as thin foils of longitudinal sections of the wires by mechanical thinning and further chemical etching.
However, this composite demonstrates the lowest Ic (75 A), which testifies that the critical current is affected much more by the internal structure and morphology of superconducting layers than by their thickness.
Critical currents of the wires with ring Nb filaments annealed by various regimes versus average grain sizes of superconducting Nb3Sn phase Thus, the analysis of structure and morphology of superconducting Nb3Sn layers in composites with ring filaments, based on TEM and SEM data, has shown that the critical current of the superconductors is affected by a number of factors, such as the completeness of Nb filaments transformation into Nb3Sn (the residual Nb amount), morphology of superconducting layers (the presence or absence of columnar grains), average grain sizes of Nb3Sn and grain size scattering.
Online since: August 2014
Authors: Wei Zhang
For exceeding the current national chloride sand processing generally uses the following methods: A: natural sand placement method ; B:freshwater flushing method ; C:the mechanical method ; D: mixed with rust inhibitor ; E:mixing .
From the above comparison that the five methods ,mechanical methods one-time investment is large, natural stacking method to save money but time-consuming, but it costs money to save time mixing rust inhibitor, and the most effective way is to freshwater flushing method , saves time and relatively economical , this method is also used by many manufacturers .
Sand used in the preparation of concrete , construction projects should give special consideration to the impact the safety and durability factors to ensure project quality and ensure the safety of sea sand applications .
Untreated sand, reclaimed water sand and the water sand concrete specimens are shown in Table 1 Table 1 C25 Strength Comparison C25 sea sand concrete Standard test pieces Untreated sand (N/mm2) Reclaimed water sand (N/mm2) River sand (N/mm2) Conservation Days 7 14 28 7 14 28 7 14 28 Experiment 1 18.2 23.1 25.1 17.5 22.3 25.3 17.8 22.5 25.6 Experiment 2 19.1 23.6 25.3 16.9 23.1 25.6 17.3 22.6 25.4 Experiment 3 18.6 23.5 25.4 17.3 23.6 25.4 17.6 22.9 25.5 Average compressive 18.6 23.4 25.3 17.2 23.0 25.4 17.6 22.7 25.5 The test results can be seen, whether the chlorine treatment significantly affect the strength of the concrete.
Coastal sand problems caused by the use and study of Sichuan Building [J] 2006. 6:129-130 [8] Wei Zhang Research on compressive properties of sea sand concrete Advanced Materials Research (ISSN: 881-883), [J] 2014 (1) 1221-1224
From the above comparison that the five methods ,mechanical methods one-time investment is large, natural stacking method to save money but time-consuming, but it costs money to save time mixing rust inhibitor, and the most effective way is to freshwater flushing method , saves time and relatively economical , this method is also used by many manufacturers .
Sand used in the preparation of concrete , construction projects should give special consideration to the impact the safety and durability factors to ensure project quality and ensure the safety of sea sand applications .
Untreated sand, reclaimed water sand and the water sand concrete specimens are shown in Table 1 Table 1 C25 Strength Comparison C25 sea sand concrete Standard test pieces Untreated sand (N/mm2) Reclaimed water sand (N/mm2) River sand (N/mm2) Conservation Days 7 14 28 7 14 28 7 14 28 Experiment 1 18.2 23.1 25.1 17.5 22.3 25.3 17.8 22.5 25.6 Experiment 2 19.1 23.6 25.3 16.9 23.1 25.6 17.3 22.6 25.4 Experiment 3 18.6 23.5 25.4 17.3 23.6 25.4 17.6 22.9 25.5 Average compressive 18.6 23.4 25.3 17.2 23.0 25.4 17.6 22.7 25.5 The test results can be seen, whether the chlorine treatment significantly affect the strength of the concrete.
Coastal sand problems caused by the use and study of Sichuan Building [J] 2006. 6:129-130 [8] Wei Zhang Research on compressive properties of sea sand concrete Advanced Materials Research (ISSN: 881-883), [J] 2014 (1) 1221-1224
Online since: June 2013
Authors: Zhi Gao Xu, Chun An Ai, Qiao Wang
Ultrasonic testing signal transmission with all kinds of information about the specimen defect properties (state and performance of defect, tissue of the material etc.), but because the signal is affected by noise in incentive, transmission and detection process, the interference to the subsequent processing signal trouble, even when serious overwhelms signal, resulting in false detection and missed detection of defects.
The continuous wavelet or wavelet analysis is composed of function family generated through extension and translation, as the scale factor, as a translation factor.
China Mechanical Engineering, 2005, Vol.16 No. 3:239-242 [15] Nello Cristianini, John Shawe-Taylor.
The Mechanical and Electronic, 2010, No. 4: 36-39
The continuous wavelet or wavelet analysis is composed of function family generated through extension and translation, as the scale factor, as a translation factor.
China Mechanical Engineering, 2005, Vol.16 No. 3:239-242 [15] Nello Cristianini, John Shawe-Taylor.
The Mechanical and Electronic, 2010, No. 4: 36-39
Online since: January 2004
Authors: Jai Sung Lee, Sergiy V. Divinski, Christian Herzig
Since the penetration depths can amount to several hundred micrometers, the tracer
atoms sample a huge amount of individual GBs supplying statistically reliable information on the
GB diffusion properties.
The segregation factor s is important for the flux (ii) and both factors, s and sa, affect the flux (iii).
Due to the applied mechanical sectioning method the nanocrystalline GB diffusivity Dgb could not be analyzed in that experiment.
The segregation factors s and sa should be known to evaluate � and �a.
For the analysis of Fe and Ni diffusion the relevant segregation factors sFe and sNi are close to unity.
The segregation factor s is important for the flux (ii) and both factors, s and sa, affect the flux (iii).
Due to the applied mechanical sectioning method the nanocrystalline GB diffusivity Dgb could not be analyzed in that experiment.
The segregation factors s and sa should be known to evaluate � and �a.
For the analysis of Fe and Ni diffusion the relevant segregation factors sFe and sNi are close to unity.