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Online since: December 2013
Authors: Wei Lv, Chao Cheng, Xiao Nan Zhang, Xin Hai Wang, Zhong Xia Zhao, Jian Wei Han, Xi Yu Lin
The drying curves about various factors were summed up to conclude airflow temperature is the most important factor which affects drying effect.
Therefore, it is necessary to consider high efficient drying method for corn stalks drying and airflow temperature for drying is not too high to prevent the precipitation of volatile and affect the property of corn stalks after drying.
Multi-factor orthogonal experiment was designed to get primary and secondary relationship of these four factors which affect drying.
Hot air temperature is the main factor which affects drying characteristics.
The factors and levels are shown in Table 2.
Therefore, it is necessary to consider high efficient drying method for corn stalks drying and airflow temperature for drying is not too high to prevent the precipitation of volatile and affect the property of corn stalks after drying.
Multi-factor orthogonal experiment was designed to get primary and secondary relationship of these four factors which affect drying.
Hot air temperature is the main factor which affects drying characteristics.
The factors and levels are shown in Table 2.
Online since: July 2011
Authors: Yan Wu, Wen Zhong Nie, Er Geng Zhang
As a results, the grit size of grinding wheel, Grinding depth and workpiece mechanical properties are the main technology factors affected the nature and size of the residual stress of ground surface.
Introduction Author’s research group on the study for the ultrasonic machining of engineering ceramics material removal mechanism [1] found that ultrasonic vibration of hard and brittle material ductile machined surface layer formed is not clear in many key issues, constraints of the Precision and Engineering Ceramics implementation process, the ductile processing field ultrasonic vibration and the physical and mechanical properties of the material removal mechanism and other issues of engineering ceramics to further reveal the mechanism of ultrasound and efficient processing of the ductile domain, for high precision machining of new technology plays a vital role.
Theoretically, every factor causing cutting temperature rising has the trand of increasing surface residule tensile stress.
Conclusions At the same conditions for micro-nanocomposite ceramic, surface tensile stress for two-dimensional supersonic vibration grinding is less than that for conventional grinding; residule press stress for the former is more than that for the latter; mechnism of material removal will affect grinding surface residule stress, if the material stress is removed by the way of ductile deformation, grinding surface keeps residule press stress, and if brittle- ductile pattern for the material is removal, due to fracture generated on the surface of ceramic grinding, which releases tensile stress, reduces tensile stress on the grinding surface of material.
Average grits size, grinding depth and mechanical performance of grinding workpiece material for grinding wheel are the process factors of nature and amount of ceramic grinding surface residule stress.
Introduction Author’s research group on the study for the ultrasonic machining of engineering ceramics material removal mechanism [1] found that ultrasonic vibration of hard and brittle material ductile machined surface layer formed is not clear in many key issues, constraints of the Precision and Engineering Ceramics implementation process, the ductile processing field ultrasonic vibration and the physical and mechanical properties of the material removal mechanism and other issues of engineering ceramics to further reveal the mechanism of ultrasound and efficient processing of the ductile domain, for high precision machining of new technology plays a vital role.
Theoretically, every factor causing cutting temperature rising has the trand of increasing surface residule tensile stress.
Conclusions At the same conditions for micro-nanocomposite ceramic, surface tensile stress for two-dimensional supersonic vibration grinding is less than that for conventional grinding; residule press stress for the former is more than that for the latter; mechnism of material removal will affect grinding surface residule stress, if the material stress is removed by the way of ductile deformation, grinding surface keeps residule press stress, and if brittle- ductile pattern for the material is removal, due to fracture generated on the surface of ceramic grinding, which releases tensile stress, reduces tensile stress on the grinding surface of material.
Average grits size, grinding depth and mechanical performance of grinding workpiece material for grinding wheel are the process factors of nature and amount of ceramic grinding surface residule stress.
Online since: August 2010
Authors: Shi Gang Wang, Bai Rui Tao, Hong Xia Zhang, Xi Bing Li
Through combination of experimental investigation with theoretical optimum design, this
paper determined the crucial factors in affecting the heat transfer capacity in micro heat pipes with a
trapezium-grooved wick structure are capillary limit and entrainment limit, and verified the validity
of the heat transfer models thus built.
According to the physico-mechanical properties of copper pipe, multi-tooth tools and the method of high-speed spin filled with full liquid are adopted to cause the surface layer metal of copper-based pipe's inner wall to produce continuous plastic deformation, and specially shaped groove structures are thus formed, i.e., different machining parameters can be set to machine sections of different shapes and micro grooves with different tooth shapes.
The second advantage is that the mechanical and physical properties of the machined finned tube would be strengthened.
Based on heat transfer theory, through optimization of the heat transfer limits, this study determines capillary and entrainment limits as the crucial factors in affecting the heat transfer capacity in micro heat pipes with a trapezium-grooved wick structure
[12] Li Xi-bing, Li Yong: China Mechanical Engineering, Vol.15, No.15 (2008), p.1847-1852
According to the physico-mechanical properties of copper pipe, multi-tooth tools and the method of high-speed spin filled with full liquid are adopted to cause the surface layer metal of copper-based pipe's inner wall to produce continuous plastic deformation, and specially shaped groove structures are thus formed, i.e., different machining parameters can be set to machine sections of different shapes and micro grooves with different tooth shapes.
The second advantage is that the mechanical and physical properties of the machined finned tube would be strengthened.
Based on heat transfer theory, through optimization of the heat transfer limits, this study determines capillary and entrainment limits as the crucial factors in affecting the heat transfer capacity in micro heat pipes with a trapezium-grooved wick structure
[12] Li Xi-bing, Li Yong: China Mechanical Engineering, Vol.15, No.15 (2008), p.1847-1852
Online since: April 2020
Authors: Yuriy Sharkeev, Egor Ibragimov, Natalya Saprykina, Alexandr Saprykin
Selective laser melting (SLM) is a manufacturing technology of metal parts of any shapes with target mechanical properties by means of laser melting.
Scientists investigate formation of a structure, being the result of numerous factors in the process of SLM [10].
This fact influences SLM and characteristics of a final product, e.g. density, microstructure, mechanical properties etc. [11, 12].
Key factors to cause an uneven surface are vapor pressure, Marangoni effect, and a heat effect of a melted powder.
Being on the melting surface, hardened drops affect the deposition of the next powder layer and final qualities like density, microstructure, mechanical properties etc.
Scientists investigate formation of a structure, being the result of numerous factors in the process of SLM [10].
This fact influences SLM and characteristics of a final product, e.g. density, microstructure, mechanical properties etc. [11, 12].
Key factors to cause an uneven surface are vapor pressure, Marangoni effect, and a heat effect of a melted powder.
Being on the melting surface, hardened drops affect the deposition of the next powder layer and final qualities like density, microstructure, mechanical properties etc.
Online since: September 2011
Authors: Zhi Xin Jia, Li Jun Liu, Hong Zhou, Li Qiong Chen, Ji Qiang Li, Tie Nan Di, Xian Yi Li
Based on studying the biological prototype of crack-resistance of dragonfly wings and finding surface thermal fatigue crack is one of the main factors affecting life of the hot work mould, it is put forward thoughts about the local laser bionic strengthening the grid mould surface.
Introduction Because hot work die touches repeatedly with high-temperature material in service time and happen fatigue by long-term alternating stress role, so mould local surface produces crack and strength is destroyed, which affects the service life of die.
Dragonfly wings is a model of excellent mechanical properties and a perfect union with flexible and rigid.
The one of most factors is that the local stress exceed elastic limit of die steel, because the temperature of rise and fall makes working surface to be produced variable stress of crushing and pulling, when aluminum melting repeatedly impacts into working surface of hot work die, as shown in Fig. 4.
Atkins: Journal of Mechanical Engineering Science.
Introduction Because hot work die touches repeatedly with high-temperature material in service time and happen fatigue by long-term alternating stress role, so mould local surface produces crack and strength is destroyed, which affects the service life of die.
Dragonfly wings is a model of excellent mechanical properties and a perfect union with flexible and rigid.
The one of most factors is that the local stress exceed elastic limit of die steel, because the temperature of rise and fall makes working surface to be produced variable stress of crushing and pulling, when aluminum melting repeatedly impacts into working surface of hot work die, as shown in Fig. 4.
Atkins: Journal of Mechanical Engineering Science.
Online since: December 2023
Authors: Bongu Vinay, Anne Kumar Raja, Dadi Ganesh, A. Sasi Kiran, B.G.S. Chandra Mouli, V.S.V. Satyanarayana, Ismail Kakaravada
The study found that both materials' mechanical properties were influenced by the filling density rate, with an increase in the rate improving the mechanical properties.
These three factors were chosen for the experiment to investigate their effects on surface roughness.
The study focused on analyzing the tensile, flexural and shear strengths and it was determined that these properties are heavily influenced by factors such as infill density, infill pattern and layer thickness.
In that we take 4 level of design and no of factors are 4 by using Taguchi L16 orthogonal array.
The Effect of Fill Rate on Mechanical Properties of PLA Printed Samples.
These three factors were chosen for the experiment to investigate their effects on surface roughness.
The study focused on analyzing the tensile, flexural and shear strengths and it was determined that these properties are heavily influenced by factors such as infill density, infill pattern and layer thickness.
In that we take 4 level of design and no of factors are 4 by using Taguchi L16 orthogonal array.
The Effect of Fill Rate on Mechanical Properties of PLA Printed Samples.
Online since: May 2015
Authors: Emil Spišák, Ivan Gajdoš, Volodymyr Krasinskyi, Tomasz Garbacz
Results and Discussion
The predicted change of physical-mechanical properties, PFR adhesive activity namely, is caused by controlled process of chemical interaction between PVP+PFR and ED-20 or PFR and ED-20 rather than physical effects due to the unique properties of PVP.
The described factors essentially affect the physical-mechanical and adhesive properties of the composite.
The dependence of physical-mechanical properties on PVP content has an extremal character with maximum at PVP content of 1 mass %.
One of the most important factors ensuring the strength of glued connections is adhesion strength and stability during operation.
Owing to this fact we obtained thermostable non-toxic paintwork materials with high technological effectiveness and adhesion, good physical-mechanical properties and low water absorbing.
The described factors essentially affect the physical-mechanical and adhesive properties of the composite.
The dependence of physical-mechanical properties on PVP content has an extremal character with maximum at PVP content of 1 mass %.
One of the most important factors ensuring the strength of glued connections is adhesion strength and stability during operation.
Owing to this fact we obtained thermostable non-toxic paintwork materials with high technological effectiveness and adhesion, good physical-mechanical properties and low water absorbing.
Online since: October 2010
Authors: Regina Kalpokaite-Dickuviene, Kristina Brinkiene, Jurate Cesniene
Application of Fiber Produced by Plasma Spray Method
in Cementitious Complex Binder
REGINA KALPOKAITE-DICKUVIENĖ1, a, KRISTINA BRINKIENE2,b,
JURATE CESNIENE3,c
1,2,3Lithuanian Energy Institute, Breslaujos str. 3, Kaunas, LT-44403, Lithuania
aregina.kalpokaite@gmail.com, bkristina@mail.lei.lt, ccesniene@mail.lei.lt
Keywords: plasma spraying, fiber, complex binder, cement, mechanical properties, density
Abstract.
Introduction Factors that influence strength of cementitious material under high temperatures can be divided into two groups: material properties and environmental factors.
Heating rate, duration of exposure to maximum temperature, cooling rate, loading conditions and moisture regimes affect the heat resistance of cementitious material.
Properties of aggregates, cement paste, binders, reinforcement agents and their thermal compatibility between each other greatly influence the mechanical properties of refractory.
In order to improve the properties of refractory composite binding material can be used instead of hydraulic, chemical or ceramic binding material.
Introduction Factors that influence strength of cementitious material under high temperatures can be divided into two groups: material properties and environmental factors.
Heating rate, duration of exposure to maximum temperature, cooling rate, loading conditions and moisture regimes affect the heat resistance of cementitious material.
Properties of aggregates, cement paste, binders, reinforcement agents and their thermal compatibility between each other greatly influence the mechanical properties of refractory.
In order to improve the properties of refractory composite binding material can be used instead of hydraulic, chemical or ceramic binding material.
Online since: December 2016
Authors: Nil Ratan Mondal, Md Minar Ahmed, Md Samsul Arefin, Mahabub Hasan Rony
After the FE model validation, this study conducted different outsole properties analysis.
Considering the above factors several prototypes of outsoles is tested in biomechanics laboratory over and over.
Solid Model of outsole Assigning Material Properties.
The material properties of PVC outsole are given below- Table 1.
In this study both of these factors were maintained properly.
Considering the above factors several prototypes of outsoles is tested in biomechanics laboratory over and over.
Solid Model of outsole Assigning Material Properties.
The material properties of PVC outsole are given below- Table 1.
In this study both of these factors were maintained properly.
Online since: September 2010
Authors: Ming Jen Tan, Anders W.E. Jarfors, Ehsan Ghassemali, Samuel C.V. Lim, Mei Qian Chew
There is as strong interaction between the scale of the microstructure and the size of the
part affecting material flow, the so-called "size effect" in microforming processes.
The results showed that change of micro-pins diameter and die angle affect the microstructure and strain distribution of the final product remarkably, that affect the mechanical properties of the pin formed.
Among the production methods for microparts, microforming has several advantages: (i) high production rate, (ii) minimized or zero material loss, (iii) excellent mechanical properties of final product, and (v) close tolerences.
The microstructural investigations showed that there is a sinusoidal material flow from shoulder to the formed pin that could affect the pin properties.
These results showed that the mechanical properties of the pin can be more homogeneous by decreasing the pin diameter and making right die entrance angle.
The results showed that change of micro-pins diameter and die angle affect the microstructure and strain distribution of the final product remarkably, that affect the mechanical properties of the pin formed.
Among the production methods for microparts, microforming has several advantages: (i) high production rate, (ii) minimized or zero material loss, (iii) excellent mechanical properties of final product, and (v) close tolerences.
The microstructural investigations showed that there is a sinusoidal material flow from shoulder to the formed pin that could affect the pin properties.
These results showed that the mechanical properties of the pin can be more homogeneous by decreasing the pin diameter and making right die entrance angle.