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Online since: August 2013
Authors: Ting Yao, Qian Tian, Shou Zhi Zhang, Fei Guo, Yu Jiang Wang
Concrete deformation measured under a certain condition in the experiment are very different from those in practical engineering structures, therefore, it’s necessary to monitor concrete properties in structures.
In the paper, by real-time continuous monitoring of reinforcement concrete slab prepared with expansive agent, time-dependent temperature variations and strain variations are obtained and analyzed, and indoor test of the mechanical properties and deformation of field sampling from the slab are presented, so that this completes a transition from the specimen in experiment to the structure in engineering.
The crack will affect the structures’ durability and reliability severely.
Moreover, on-site monitoring data can reveal the actual information of structures’ state, comprehensively reflecting various kinds of factors influencing structural behavior.
According to actual type of structure, properties of raw material and trial mixture in the lab, concrete are prepared with mix proportions shown in Table 1, whose slump is close to 130 mm.
In the paper, by real-time continuous monitoring of reinforcement concrete slab prepared with expansive agent, time-dependent temperature variations and strain variations are obtained and analyzed, and indoor test of the mechanical properties and deformation of field sampling from the slab are presented, so that this completes a transition from the specimen in experiment to the structure in engineering.
The crack will affect the structures’ durability and reliability severely.
Moreover, on-site monitoring data can reveal the actual information of structures’ state, comprehensively reflecting various kinds of factors influencing structural behavior.
According to actual type of structure, properties of raw material and trial mixture in the lab, concrete are prepared with mix proportions shown in Table 1, whose slump is close to 130 mm.
Online since: December 2003
Authors: Maria Vallet-Regí, Sussette Padilla
This method allows
obtaining pieces with complex shapes and high mechanical strength.
Gelcasting requires slurries with good flow properties and high solid content (at least 50 vol.%).
However, its clinical applications have been limited due to its low mechanical properties and to the difficulty to obtain pieces with complex shapes similar to the bone defects.
Conclusions The calcination temperature affects the surface area, porosity and composition of HA powders, and this factors play an important role in the rheological behaviour of the suspensions.
Gelcasting requires slurries with good flow properties and high solid content (at least 50 vol.%).
However, its clinical applications have been limited due to its low mechanical properties and to the difficulty to obtain pieces with complex shapes similar to the bone defects.
Conclusions The calcination temperature affects the surface area, porosity and composition of HA powders, and this factors play an important role in the rheological behaviour of the suspensions.
Online since: September 2008
Authors: Cheng Yong Wang, M.D. Chen, P.X. Yang, Jing Ming Fan
It is founded that the processing time is the most remarkable influence factor on
the material removal and the depth of the holes.
With the advantages of no change in the mechanical, physical and chemical properties, no heat-affected zone, good quality incision, no spark, no pollution, centralized energy, this technology become one of the most important basic precision micro-machining technologies, for the processing of brittle materials, rigid high reflectivity materials and many small geometric surface of mold, where laser thermal processing technology can't be used [1].
And the increase in working pressure doesn't affect the basic shape of hole while the abrasives get greater momentum and increase of the erosion at the same time.
Processing time Processing time is the most notable factor on the growth of material removal among various technical parameters of MASJ.
Conclusions The effects of processing conditions have been discussed; it is found that the most significant factor to increase the material removal of glass is the processing time.
With the advantages of no change in the mechanical, physical and chemical properties, no heat-affected zone, good quality incision, no spark, no pollution, centralized energy, this technology become one of the most important basic precision micro-machining technologies, for the processing of brittle materials, rigid high reflectivity materials and many small geometric surface of mold, where laser thermal processing technology can't be used [1].
And the increase in working pressure doesn't affect the basic shape of hole while the abrasives get greater momentum and increase of the erosion at the same time.
Processing time Processing time is the most notable factor on the growth of material removal among various technical parameters of MASJ.
Conclusions The effects of processing conditions have been discussed; it is found that the most significant factor to increase the material removal of glass is the processing time.
Online since: September 2011
Authors: Mo Yuan Zhou, Guan Yang Liu, Ke Ke Lu
From the perspective of mechanical design, not only the maximum output force of the actuator is limited, but the mechanical strength of the device will constrain the final output power.
So finding a suitable range of output power, which can meet application needs, without degrading other properties, is an optimal choice.
The mass, inertia and friction of the move part affects the back-drivability of the haptic device and the inertia is the leading factor in this device. 5.Approach 5.1Actuator Available actuators for haptic applications are active actuators, passive actuators, and hybrid actuator.
This nonlinear factor will affect the stability of control system and the precision of transmission.
Also the tension mechanism is a very important factor which influences the transmission accuracy.
So finding a suitable range of output power, which can meet application needs, without degrading other properties, is an optimal choice.
The mass, inertia and friction of the move part affects the back-drivability of the haptic device and the inertia is the leading factor in this device. 5.Approach 5.1Actuator Available actuators for haptic applications are active actuators, passive actuators, and hybrid actuator.
This nonlinear factor will affect the stability of control system and the precision of transmission.
Also the tension mechanism is a very important factor which influences the transmission accuracy.
Online since: January 2005
Authors: Yun Hua Xu, Liang Fang, Qihong Cen, Jin Hua Zhu
Wear Mechanism of Nano-structured Surface Layer
Under High Impact Energy
Qihong CEN1,2,a, Yunhua XU
2,b
, Liang FANG
1,2,c
, Jinhua ZHU1,d
1
School of Mechanical and Electronic Engineering, Xian University of Architecture & Technology,
Xian 710055, P.
China 2 State Key Laboratory for Mechanical Behavior of Materials, Xian Jiaotong University, Xian 710049, P.
The result showed from the wear tests of Hadfield steel and AISI 1045 steel that nanocrystalized process of subsurface becomes one of control factors to affect wear losses and wear mechanism under high impact energy.
Introduction Wear mechanism of materials is not only dependent on original microstructure and properties, but also on their evolution procedure during service.
China 2 State Key Laboratory for Mechanical Behavior of Materials, Xian Jiaotong University, Xian 710049, P.
The result showed from the wear tests of Hadfield steel and AISI 1045 steel that nanocrystalized process of subsurface becomes one of control factors to affect wear losses and wear mechanism under high impact energy.
Introduction Wear mechanism of materials is not only dependent on original microstructure and properties, but also on their evolution procedure during service.
Online since: July 2011
Authors: Ji Hong Dong, Quan Feng Guo, Wei Li, Wei Guo Zhao, Hai Ping Wang
Special material, structure and other factors determine that C/C composite has high specific strength, high specific modulus, good fracture toughness and excellent high temperature retention, high wear resistance, high ablation resistance[3], which could meet the requirements of aerospace components such as "high temperature, high pressure, high specific strength, light weight, high reliability".
Lamination defect in C/C composite Defects will make the performance of component reduced, damage mechanical and physical properties of component, affect its reliability, safety and service life.
Pinhole gathered type defect mainly affects composite's density.
However, due to the limit of composite's structure and testing methods itself, quite a lot of problems will appear during detecting process, and the accuracy and reliability are affected.
Luo: Research on Microstructure and Properties of the Wearable Carbon/Carbon Composite, in Aeronautical Manufacturing Technology, volume 15,(2009)
Lamination defect in C/C composite Defects will make the performance of component reduced, damage mechanical and physical properties of component, affect its reliability, safety and service life.
Pinhole gathered type defect mainly affects composite's density.
However, due to the limit of composite's structure and testing methods itself, quite a lot of problems will appear during detecting process, and the accuracy and reliability are affected.
Luo: Research on Microstructure and Properties of the Wearable Carbon/Carbon Composite, in Aeronautical Manufacturing Technology, volume 15,(2009)
Online since: May 2012
Authors: Er Peng Zhang, Fu Chen, Yu Zhang, Hai Lin Zhang, Yan Hua Wei
Tillage methods significantly affect GHG emissions in the farmland.
The two main factors referred above reduced the evaporation at soil surface.
CO2 emissions flux during the whole year under different tillage Results in this study were similar to previous researches which reported that soil temperature and SMC were important affecting factors of respiration [7].
Results of this study give a good indication of the significance of tillage practices for mitigating GHG emissions during growing seasons, further research on the soil properties which are responsible for the emissions patterns has to be conducted.
Rey: Exchange of greenhouse gases between soil and atmosphere: interactions of soil physical factors and biological processes.
The two main factors referred above reduced the evaporation at soil surface.
CO2 emissions flux during the whole year under different tillage Results in this study were similar to previous researches which reported that soil temperature and SMC were important affecting factors of respiration [7].
Results of this study give a good indication of the significance of tillage practices for mitigating GHG emissions during growing seasons, further research on the soil properties which are responsible for the emissions patterns has to be conducted.
Rey: Exchange of greenhouse gases between soil and atmosphere: interactions of soil physical factors and biological processes.
Online since: February 2016
Authors: N.M. Tanklevskaya, Alexander N. Maznichevsky
It was established how aluminum and nitrogen content in the liquid metal solution affects the composition and amount of separated excess phases.
Introduction Boron steel has drawn more and more attention because of its advantages in environmental protection and good mechanical properties, which will have a promising application prospect.
The solubilities of oxygen, carbon, and nitrogen in the liquid metal solution decrease with the temperature, a factor that gives rise to nonmetallic inclusions.
It was established how the aluminum and titanium content in the liquid metal solution affects the composition and amount of the separated excess phases.
Introduction Boron steel has drawn more and more attention because of its advantages in environmental protection and good mechanical properties, which will have a promising application prospect.
The solubilities of oxygen, carbon, and nitrogen in the liquid metal solution decrease with the temperature, a factor that gives rise to nonmetallic inclusions.
It was established how the aluminum and titanium content in the liquid metal solution affects the composition and amount of the separated excess phases.
Online since: June 2020
Authors: Puteri Sri Melor Megat Yusoff, Tengku Amran Tengku Mohd, Putri Nadzrul Faizura Megat Khamaruddin, Muhammad Shafiq Mat Shayuti, Rahida Wati Sharudin, Mohamad Zaki Abdullah
The deviation was due to the exclusion of factors such as PC particulates geometry, size, and dispersion in PP matrix.
Other factors that have been cited to influence thermal conductivity in composites are the crystallinity and crystal chain direction [8].
Additional factors include; the morphology, density, molecular chain orientation, and crystallinity.
These traits then affect the inherent properties of a polymer blend such as thermal conductivity as well as mass and heat permeability [24].
Nielsen, Dynamic mechanical properties of particulate‐filled composites, J. of Appl.
Other factors that have been cited to influence thermal conductivity in composites are the crystallinity and crystal chain direction [8].
Additional factors include; the morphology, density, molecular chain orientation, and crystallinity.
These traits then affect the inherent properties of a polymer blend such as thermal conductivity as well as mass and heat permeability [24].
Nielsen, Dynamic mechanical properties of particulate‐filled composites, J. of Appl.
Online since: October 2013
Authors: Jin Zhu Gao, Pai Xian Fu, Hong Wei Liu, Xiao Ping Ma
Of all the problems that deteriorate the properties of heavy steel ingots, inclusions, macro-segregation, and shrinkage porosity are the most significant ones since it is highly difficult to reduce those defects by subsequent thermo-mechanical treatments [1].
Inclusions in steels are known to exert both harmful and beneficial influences on their some properties.
So the properties of the final product could be improved if the way of forging can be carried out in a more proper way.
In this study, the boundary condition of FEM simulation modeling is shown in Fig.3, the properties of inclusion and matrix used in FEM are summarized in Table 2.
The matrix continuity of the steels are destroyed, the micro-crack was nucleated on the inclusions firstly, propagated due to stress concentration. 2) The banded structure is the secondary factor on affecting crack formation in low carbon manganese steels. 3) Crack initiation and propagation is much easier when segregation, banded structure and large and grid inclusions defects exist simultaneously.
Inclusions in steels are known to exert both harmful and beneficial influences on their some properties.
So the properties of the final product could be improved if the way of forging can be carried out in a more proper way.
In this study, the boundary condition of FEM simulation modeling is shown in Fig.3, the properties of inclusion and matrix used in FEM are summarized in Table 2.
The matrix continuity of the steels are destroyed, the micro-crack was nucleated on the inclusions firstly, propagated due to stress concentration. 2) The banded structure is the secondary factor on affecting crack formation in low carbon manganese steels. 3) Crack initiation and propagation is much easier when segregation, banded structure and large and grid inclusions defects exist simultaneously.