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Online since: February 2014
Authors: Hai Jing Lv, Zhen Kun Han
In the use of algorithm, we choose the digital guidance algorithm, to provide a kind of mechanical modeling and simulation layout algorithm based on force directed algorithm, its essence is the node as a particle of topology, which can be the establishment of a mechanical relationship in each particle [5].
Otherwise, because the tension between the nodes or mutual repulsions cause nodes mutually mixed together, affecting the visualization of the entire system.
Therefore, according to the mechanical relationship, the defined the mapping formula is as follows:
(3) In the construction of network, random network and scale-free network have the huge difference in mathematical properties, and the degree distribution is shown in Figure 2.
Second stage: according to the introduced digital oriented mechanical algorithm, we can carry out iterative computation, until it meets the convergence conditions.
Otherwise, because the tension between the nodes or mutual repulsions cause nodes mutually mixed together, affecting the visualization of the entire system.
Therefore, according to the mechanical relationship, the defined the mapping formula is as follows:
(3) In the construction of network, random network and scale-free network have the huge difference in mathematical properties, and the degree distribution is shown in Figure 2.
Second stage: according to the introduced digital oriented mechanical algorithm, we can carry out iterative computation, until it meets the convergence conditions.
Online since: May 2015
Authors: Hong Yu, Hong Bo Chen, Peng Zhang
Because of size effect, surface effect and quantum effect [3,4,5], the properties of nano-scale material are known to be different from those of their macroscopic analogs, which are difficult to explain by continuous theories.
So the high frequency characteristics and its influence factors will determine the accuracy of the detection and the sensitivity of detection system.
Affected by the prepared process, the cross sections of the silicon nanowires are not shaped in perfect circular or rectangle.
On the basis of continuum theory, we can find that the thickness of the nanowires also affects the vibration frequency of the nanowires, and with the increase of thickness the vibration frequency will increase too.
References [1] Craighead H G, Nano-electro mechanical systems, J.
So the high frequency characteristics and its influence factors will determine the accuracy of the detection and the sensitivity of detection system.
Affected by the prepared process, the cross sections of the silicon nanowires are not shaped in perfect circular or rectangle.
On the basis of continuum theory, we can find that the thickness of the nanowires also affects the vibration frequency of the nanowires, and with the increase of thickness the vibration frequency will increase too.
References [1] Craighead H G, Nano-electro mechanical systems, J.
Online since: August 2016
Authors: Li Hua Zhan, Yong An Zhang
Online Prediction and Verification of Cured Quality of
Advanced Composites in Autoclave Process
Yongan Zhang1,a, Lihua Zhan1,b*
1 College of Mechanical and Electrical Engineering, Central South University,
Changsha, China 410083
acsuzya@csu.edu.cn, byjs-cast@csu.edu.cn,
Keywords: Composite, Curing process, Fiber Bragg grating, Online prediction
Abstract.
The strain in curing process of composite part would be influenced by curing compaction, resin flow, curing action and tool-part interaction, meanwhile these factors would also influence the final cured quality of composite part.
Introduction Carbon fiber reinforced resin matrix composites are wildly used in aerospace filed for its excellent properties of high specific strength and stiffness, good creep-resistant performance, significant weight reduction effect, and so on[1,2].
But in the fabrication process of composite part, defect such as pore, delamination and rich resin, would decrease the part’s dimensional precision and the mechanical properties of shear strength, tensile strength, bending strength, finally influence part cured quality, even cause the part failure[6].
In cooling stage, the resin is fully cured, the difference of pressure mainly affected the tool-part interaction.
The strain in curing process of composite part would be influenced by curing compaction, resin flow, curing action and tool-part interaction, meanwhile these factors would also influence the final cured quality of composite part.
Introduction Carbon fiber reinforced resin matrix composites are wildly used in aerospace filed for its excellent properties of high specific strength and stiffness, good creep-resistant performance, significant weight reduction effect, and so on[1,2].
But in the fabrication process of composite part, defect such as pore, delamination and rich resin, would decrease the part’s dimensional precision and the mechanical properties of shear strength, tensile strength, bending strength, finally influence part cured quality, even cause the part failure[6].
In cooling stage, the resin is fully cured, the difference of pressure mainly affected the tool-part interaction.
Online since: June 2015
Authors: Imran Syakir Mohamad, Norli Abdullah, Sharifah Bee Abd Hamid
In order for us to move on towards realistic applications of CNFs, it is important to understand their properties and how they affect the behavior in water which is part of the research findings.
Three different kinds of carbon based adsorbent with different morphology and chemical properties were used in this study.
Textural and chemical properties of the adsorbent are given in Table 2.
Table 2, Textural and chemical properties of carbon based adsorbent.
Qiu, Investigation of factors affecting adsorption of transition metals on oxidized carbon nanotubes, J.
Three different kinds of carbon based adsorbent with different morphology and chemical properties were used in this study.
Textural and chemical properties of the adsorbent are given in Table 2.
Table 2, Textural and chemical properties of carbon based adsorbent.
Qiu, Investigation of factors affecting adsorption of transition metals on oxidized carbon nanotubes, J.
Online since: April 2015
Authors: Khairul Azwan Ismail, S.M. Nasir, M.A. Fairuz, Z. Shayfull
Properties of plastic and mould insert material are shown in Table 1 and 2 respectively.
Physical and mechanical properties of ABS.
Properties of P20 mould steel.
Factors and levels for different type of gate.
The significant factors affected warpage of the moulded parts with a single gate includes factor A (coolant inlet temperature, CT), factor B (material melt temperature, MeT), factor C (packing pressure, PP), the second order effect of factor A (coolant inlet temperature, CT), B (material melt temperature, MeT) and C (packing pressure, PP), and the interaction effect of factor A (coolant inlet temperature, CT) with factor B (material melt temperature, MeT).
Physical and mechanical properties of ABS.
Properties of P20 mould steel.
Factors and levels for different type of gate.
The significant factors affected warpage of the moulded parts with a single gate includes factor A (coolant inlet temperature, CT), factor B (material melt temperature, MeT), factor C (packing pressure, PP), the second order effect of factor A (coolant inlet temperature, CT), B (material melt temperature, MeT) and C (packing pressure, PP), and the interaction effect of factor A (coolant inlet temperature, CT) with factor B (material melt temperature, MeT).
Online since: November 2011
Authors: Bui Phuong Trinh, Nguyen van Chanh
The properties of UHPFRC specimens, cured by steam curing at 90oC, are investigated.
Recent research has shown that distribution and orientation of the steel fibres in UHPFRC can have a considerable effect on its mechanical properties [5][6], similar to the effects observed for normal steel fibre-reinforced concrete [3].
Paste volume in concrete is also a main factor influencing the shrinkage.
A, “Relationships between fibre distribution, workability and the mechanical properties of SFRC applied to precast roof elements”, Materials and Structures, 2006, pp. 411-420
GS, “Effect of filling method on fibre orientation & dispersion and mechanical properties of UHPC”, Proceedings of Second International Symposium on Ultra High Performance Concrete, Kassel, Germany.
Recent research has shown that distribution and orientation of the steel fibres in UHPFRC can have a considerable effect on its mechanical properties [5][6], similar to the effects observed for normal steel fibre-reinforced concrete [3].
Paste volume in concrete is also a main factor influencing the shrinkage.
A, “Relationships between fibre distribution, workability and the mechanical properties of SFRC applied to precast roof elements”, Materials and Structures, 2006, pp. 411-420
GS, “Effect of filling method on fibre orientation & dispersion and mechanical properties of UHPC”, Proceedings of Second International Symposium on Ultra High Performance Concrete, Kassel, Germany.
Online since: February 2021
Authors: Pradeep Khanna, Prithu Mishra, Shruti Sood, Mayank Pandit
Powder and extrusion-based techniques produce porous structures with poor mechanical properties.
These processes can bring about desired improvements in porosity levels, precipitate phases, grain size, grain orientation and mechanical properties [69].
AM Technology Post Processing Technique Improved Properties 1.
Selective Laser Sintering (SLS) Infiltration using polymer infiltrates [76] Elimination of voids and improved mechanical strength Metal Coating [91] Improved mechanical and electrical properties 4.
The build time for a model in AM or an individual assembly depends on factors like part size, layer thickness, build orientation and printing speed.
These processes can bring about desired improvements in porosity levels, precipitate phases, grain size, grain orientation and mechanical properties [69].
AM Technology Post Processing Technique Improved Properties 1.
Selective Laser Sintering (SLS) Infiltration using polymer infiltrates [76] Elimination of voids and improved mechanical strength Metal Coating [91] Improved mechanical and electrical properties 4.
The build time for a model in AM or an individual assembly depends on factors like part size, layer thickness, build orientation and printing speed.
Online since: September 2011
Authors: Bing Yu Pan, Min Huang
The characteristics of the fiber reinforced concrete are mainly decided by the physical properties and mechanical performance of the fiber.
Compared with ordinary concrete, steel fiber reinforced concrete has superior tensile, bending, shear, fatigue resistance and high toughness properties, which not only can improve the rock mass cohesion and internal friction angle, can eliminate the cavity opening on the surface after the rock excavation that can bring up uneven stress concentration and can improve the mechanical properties of rock and effective control over the surrounding rock deformation.
Polypropylene fiber reinforced concrete is mixed with a small amount of chopped polypropylene fibers to enhance or improve certain properties of concrete composites.
Characteristics of polypropylene fiber reinforced shotcrete include that: (1) High strength properties of polypropylene fiber reinforced concrete.
Study on the mechanical properties and constitutive relation of steel fiber reinforced concrete[J].
Compared with ordinary concrete, steel fiber reinforced concrete has superior tensile, bending, shear, fatigue resistance and high toughness properties, which not only can improve the rock mass cohesion and internal friction angle, can eliminate the cavity opening on the surface after the rock excavation that can bring up uneven stress concentration and can improve the mechanical properties of rock and effective control over the surrounding rock deformation.
Polypropylene fiber reinforced concrete is mixed with a small amount of chopped polypropylene fibers to enhance or improve certain properties of concrete composites.
Characteristics of polypropylene fiber reinforced shotcrete include that: (1) High strength properties of polypropylene fiber reinforced concrete.
Study on the mechanical properties and constitutive relation of steel fiber reinforced concrete[J].
Online since: July 2020
Authors: Iskandar Hasanuddin, Teuku Firsa, Muhammad Tadjuddin, Aulia Udink
Poor ability to move the snarling in the drilling process in terms of small diameter holes frequently affects the tools ware and poor surface quality.
Key factors which determine tool life and hole quality are chips formation, burr formation, angle of cutting radius, coolant, point of cutting, machining conditions, angle of the tool, and peck drilling [1].
The burr formation depends on several factors such as the nature of the work piece material and cutting conditions.
The burrs can increase in proportion to the increasing properties of material ductility as well as the tool geometry [1].
Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 227(12), 1347-1355
Key factors which determine tool life and hole quality are chips formation, burr formation, angle of cutting radius, coolant, point of cutting, machining conditions, angle of the tool, and peck drilling [1].
The burr formation depends on several factors such as the nature of the work piece material and cutting conditions.
The burrs can increase in proportion to the increasing properties of material ductility as well as the tool geometry [1].
Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 227(12), 1347-1355
Online since: July 2015
Authors: Xing Hui Yang, Yong Kun Wang, Wen Rui Duan, Hong Yang Chen, Zi Li Kou, Duan Wei He
This paper aims to study the sintering process and mechanical properties of submicron polycrystalline diamond (SMPD) without any secondary phases and binder materials under pressure of 7-8 GPa and 1400 ℃-1800 ℃, using the bi-layer assembly and the conventional assembly methods.
The graphitization of diamond was found to be an important factor determining the hardness of samples sintered using the bi-layer assembly.
However, the sintered body of polycrystalline diamond (PCD), consisting of small diamond grains orienting in random directions, may have higher toughness and more isotropic mechanical properties than the single crystal diamond.
Various additives can fill intergrain pores in the compression of diamond powders and promote to bind among adjacent diamond grains employing the process 2, while they can also substantially affect the mechanical properties, oxidation resistance, etc.
Unfortunately, the study of properties of submicron diamond sintered samples such as sintering mechanism, microstructure, mechanical properties, cutting performance and so on have not yet been detailed reported.
The graphitization of diamond was found to be an important factor determining the hardness of samples sintered using the bi-layer assembly.
However, the sintered body of polycrystalline diamond (PCD), consisting of small diamond grains orienting in random directions, may have higher toughness and more isotropic mechanical properties than the single crystal diamond.
Various additives can fill intergrain pores in the compression of diamond powders and promote to bind among adjacent diamond grains employing the process 2, while they can also substantially affect the mechanical properties, oxidation resistance, etc.
Unfortunately, the study of properties of submicron diamond sintered samples such as sintering mechanism, microstructure, mechanical properties, cutting performance and so on have not yet been detailed reported.