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Online since: October 2018
Authors: Renat V. Gavariev, I.A. Savin
The specified layer is affected by heatstroke which intensity increases at increase in temperature of filling.
The wear at CUP is difficult process as factors cyclic hydrodynamic, temperature and physical and chemical influences are added from the filled-in fusion.
Thus, on the basis of the analysis of mechanisms of destruction of form-building elements of compression molds of LPD, it is possible to allocate the following major factors of their failure: - a grid of cracks on a form-building surface; - the through cracks getting deep into material of compression molds; - smyaty form-building elements; - mechanical wear of form-building elements of compression molds; - corrosion; - erosion; - sticking of the filled-in fusion to a form-building surface.
Savaşkan, Effects of Contact Pressure and Sliding Speed on the Unlubricated Friction and Wear Properties of Zn-15Al-3Cu-1Si Alloy, Tribology Transactions, 6(59) (2016) 1114-1121
Yang, The effect of casting temperature on the properties of squeeze cast aluminium and zinc alloys, Journal of Materials Processing Technology, 140 (2003) 391-396
The wear at CUP is difficult process as factors cyclic hydrodynamic, temperature and physical and chemical influences are added from the filled-in fusion.
Thus, on the basis of the analysis of mechanisms of destruction of form-building elements of compression molds of LPD, it is possible to allocate the following major factors of their failure: - a grid of cracks on a form-building surface; - the through cracks getting deep into material of compression molds; - smyaty form-building elements; - mechanical wear of form-building elements of compression molds; - corrosion; - erosion; - sticking of the filled-in fusion to a form-building surface.
Savaşkan, Effects of Contact Pressure and Sliding Speed on the Unlubricated Friction and Wear Properties of Zn-15Al-3Cu-1Si Alloy, Tribology Transactions, 6(59) (2016) 1114-1121
Yang, The effect of casting temperature on the properties of squeeze cast aluminium and zinc alloys, Journal of Materials Processing Technology, 140 (2003) 391-396
Online since: May 2007
Authors: Zhan Hua Gao, Qing Yuan Wang, Jing Hong Fan, Xiang Guo Zeng, Xiang He Peng
In order to describe the cyclic stress and strain
properties of AM60 by means of the energy storing characteristics of microstructure during
irreversible deformation, a plastic constitutive model with no yielding surface was developed for
single crystal by adopting a spring-dashpot mechanical system.
The polycrystalline plastic constitutive model is established based on a simple mechanical model, by utilizing the KBW self-consistent theory.
When coupled with large and variable grain sizes, the HCP structure has in the past led to less than optimal mechanical properties.
Conversely, increasing temperature has an adverse affect on mechanical properties [16].
Many magnesium alloys have been developed and continue to be researched and developed in an effort to improve mechanical properties.
The polycrystalline plastic constitutive model is established based on a simple mechanical model, by utilizing the KBW self-consistent theory.
When coupled with large and variable grain sizes, the HCP structure has in the past led to less than optimal mechanical properties.
Conversely, increasing temperature has an adverse affect on mechanical properties [16].
Many magnesium alloys have been developed and continue to be researched and developed in an effort to improve mechanical properties.
Online since: June 2014
Authors: Yu Xian Ding, Ning Bo Ma, Yu Xin Ding
As a kind of labor-intensive industry, the building industry is characteristic of fixed product, huge staff mobility and many participants, which in turn bring about many insecure factors, and greatly affect the development of construction enterprises and national economy.
The good safety management can not only bring social reputation and economic benefits to the enterprises, but also keep the companies from losing property.
With a long production cycle and a bulky size, the building product is usually constructed in outdoor or high place, which is often affected by physioclimate.
Construction machineries, like tic-tac frame and portal frame, with laggard safety devices can easily cause mechanical injuries and fall accidents, which should be restricted or eliminated.
Where the production activities are, there must have unsafe factors and endless demands of preventing the harm or protecting the workers.
The good safety management can not only bring social reputation and economic benefits to the enterprises, but also keep the companies from losing property.
With a long production cycle and a bulky size, the building product is usually constructed in outdoor or high place, which is often affected by physioclimate.
Construction machineries, like tic-tac frame and portal frame, with laggard safety devices can easily cause mechanical injuries and fall accidents, which should be restricted or eliminated.
Where the production activities are, there must have unsafe factors and endless demands of preventing the harm or protecting the workers.
Online since: September 2014
Authors: Mohammadzaman Savari, Paul Josef Mauk, Oberrat Bernhardt Weyh
Therefore, there will be continuous variations of longitudinal stresses affecting the force, required work and quality of product.
For this reason, the reaction of the non-mechanical influences on mechanical values will be taken in account by special formulated characteristics depending on rotational angle or rotational angular velocity [1].
The rigid elements refer to "rotational mass elements" that have inertial, absolute damping and coupling properties.
Figure 7: Influence of Rayleigh damping factors on armature current.
The amplitude and mean value of armature current in no-load steady state will be changed in relation to Rayleigh damping factors α and ß.
For this reason, the reaction of the non-mechanical influences on mechanical values will be taken in account by special formulated characteristics depending on rotational angle or rotational angular velocity [1].
The rigid elements refer to "rotational mass elements" that have inertial, absolute damping and coupling properties.
Figure 7: Influence of Rayleigh damping factors on armature current.
The amplitude and mean value of armature current in no-load steady state will be changed in relation to Rayleigh damping factors α and ß.
Online since: June 2014
Authors: Markus Bambach, Gerhard Hirt, Alexander Mikloweit, Michael Pietryga
The performed experimental parameter study confirms the expected influencing factors and is used to determine parameters of a bonding model, which can be integrated in a finite element simulation.
By permanently joining suitable metals, this process allows a combination of the individual advantages of the used metals and results in a composite with specific optical, mechanical, chemical, thermal and electro-magnetic properties.
In summary, the known influence factors on the bond strength are surface enlargement, normal pressure, temperature, strain rate, shear strain and the surface condition.
This test procedure should allow an individual variation of the influencing factors and a characterization of the bond strength.
The results confirm the expected effect of the influencing factors on the bond strength and are used to determine parameters of a bonding model, which was integrated in a user-subroutine.
By permanently joining suitable metals, this process allows a combination of the individual advantages of the used metals and results in a composite with specific optical, mechanical, chemical, thermal and electro-magnetic properties.
In summary, the known influence factors on the bond strength are surface enlargement, normal pressure, temperature, strain rate, shear strain and the surface condition.
This test procedure should allow an individual variation of the influencing factors and a characterization of the bond strength.
The results confirm the expected effect of the influencing factors on the bond strength and are used to determine parameters of a bonding model, which was integrated in a user-subroutine.
Online since: September 2013
Authors: Dao Fang Wang, Nan Tong Zhang, Xue Qing Wang, Yan Chen
Based on the study of concrete pile composite foundation, the effect of concrete pile composite foundation on reinforcement and influence factors of settlement are analyzed in the paper.
The effect of reinforcement of concrete pile composite foundation is analyzed and the different influence factors of concrete pile composite foundation settlement are numerical simulated, mainly the pile modulus and embankment modulus, in the paper.
The main soil of both sides is that, the surface layer is soil with good physical and mechanical properties in the first 1.3m, and flow plastic silt or silty clay is in the next 18m while plastic and flow plastic of silty clay or loam is in the next 50m.
The results of numerical simulation of concrete pile composite foundation Numerical simulation on the factors of composite foundation settlement To research on the effects of the pile modulus on the composite foundation settlement, the calculation is that the pile length is 15m, the pile diameter is 0.4m, embankment height is 2m, the width of the top surface of the embankment is 44m, the width of the bottom surface of the embankment is 48m.
The compression of reinforced area is less affected by the deformation modulus of embankment soil.
The effect of reinforcement of concrete pile composite foundation is analyzed and the different influence factors of concrete pile composite foundation settlement are numerical simulated, mainly the pile modulus and embankment modulus, in the paper.
The main soil of both sides is that, the surface layer is soil with good physical and mechanical properties in the first 1.3m, and flow plastic silt or silty clay is in the next 18m while plastic and flow plastic of silty clay or loam is in the next 50m.
The results of numerical simulation of concrete pile composite foundation Numerical simulation on the factors of composite foundation settlement To research on the effects of the pile modulus on the composite foundation settlement, the calculation is that the pile length is 15m, the pile diameter is 0.4m, embankment height is 2m, the width of the top surface of the embankment is 44m, the width of the bottom surface of the embankment is 48m.
The compression of reinforced area is less affected by the deformation modulus of embankment soil.
Online since: December 2012
Authors: Zhi Hua Li, Xin Zhu Hua, Ke Yang, Ruo Jun Zhu, De Sheng Zhou
Numerical analysis of influencing factors of stability in thick coal seam mining roadway
Zhihua Li1,2, a, Xinzhu Hua2,b , Ke Yang2,c , Ruojun Zhu2,d and Desheng Zhou3,e
1 Mobile Center of Post Doctor Science and Research of Mining Engineering, Anhui University of Science and Technology, Huainan 232001, China;
2 Key Laboratory of Mine Safety and High Efficient Mining Jointly Built by Anhui Province and Ministry of Education, Anhui University of Science and Technology, Huainan 232001, China;
3 Liuzhuang Coal Mine, State Development and Investment Xinji Energy Co.
Therefore, the FLAC-3D software was used in this paper to study the stability of roadway surrounding rock in thick coal seam. 2.2 Strata properties and boundary conditions The model can be divided into x-, y- and z-components of vector quantities, assume that the x-direction corresponds to the direction of working face advance, y-direction to tend towards and z-direction to the vertical direction.
We refer to the geological information of drill 6# at the 171303 working face of the Liuzhuang Coal Mine for strata properties, because this drill is comparatively accurate. 3 Roadway underground pressure characteristics in thick coal seam 3.1 Roadway underground pressure characteristics during tunneling Based on the above model, the 171301 working face were simulated.
Mechanical model study on roof control for fully-mechanized coal face with large mining height [J].
Deformation mechanism of thick seam roadway and establishment of mechanical model [J].
Therefore, the FLAC-3D software was used in this paper to study the stability of roadway surrounding rock in thick coal seam. 2.2 Strata properties and boundary conditions The model can be divided into x-, y- and z-components of vector quantities, assume that the x-direction corresponds to the direction of working face advance, y-direction to tend towards and z-direction to the vertical direction.
We refer to the geological information of drill 6# at the 171303 working face of the Liuzhuang Coal Mine for strata properties, because this drill is comparatively accurate. 3 Roadway underground pressure characteristics in thick coal seam 3.1 Roadway underground pressure characteristics during tunneling Based on the above model, the 171301 working face were simulated.
Mechanical model study on roof control for fully-mechanized coal face with large mining height [J].
Deformation mechanism of thick seam roadway and establishment of mechanical model [J].
Online since: December 2018
Authors: Takafumi Yokoyama, Shunsuke Taniguchi
The mechanical properties of the precipitation hardened steel sheets depend on the precipitation state of precipitated particles.
After the hot rolling, in order to remove the scale, mechanical grinding was carried out from 3mm to 2mm thickness.
Since no significant difference of microstructure was observed in optical and EBSD observations, it is considered that this difference in mechanical properties is attributed to the precipitation state of carbides.
First of all, grain size is a factor that dominates the toughness of steel.
The mechanism of the precipitation state of carbides affecting the TS-AE balance was discussed.
After the hot rolling, in order to remove the scale, mechanical grinding was carried out from 3mm to 2mm thickness.
Since no significant difference of microstructure was observed in optical and EBSD observations, it is considered that this difference in mechanical properties is attributed to the precipitation state of carbides.
First of all, grain size is a factor that dominates the toughness of steel.
The mechanism of the precipitation state of carbides affecting the TS-AE balance was discussed.
Online since: July 2017
Authors: P. Vijian, S.M. Ravikumar
Development of Mathematical Models for Prediction of Weld Bead Geometry of GTAW Stainless Steel
S.M.Ravikumar1, a * and P.Vijian2, b
1Department of Mechanical Engineering, M.A.M.College of Engineering,
Tiruchirappalli, 621 105, Tamil nadu, India.
2Department of Mechanical Engineering, Government College of Technology,
Coimbatore,641 013, Tamil nadu, India.
The quality of the joint can be defined in terms of properties such as weld bead geometry, mechanical properties and distortion.
The heat-affected zone, the molten metal, and the tungsten electrode are all shielded from atmospheric contamination by a blanket of inert gas fed through the GTAW torch.
The weld bead geometry plays an important role in determining the mechanical properties of the welded joints.
The significance of the factors on overall quality characteristics of the weldment has also been evaluated quantitatively by the analysis of variance method (ANOVA).
The quality of the joint can be defined in terms of properties such as weld bead geometry, mechanical properties and distortion.
The heat-affected zone, the molten metal, and the tungsten electrode are all shielded from atmospheric contamination by a blanket of inert gas fed through the GTAW torch.
The weld bead geometry plays an important role in determining the mechanical properties of the welded joints.
The significance of the factors on overall quality characteristics of the weldment has also been evaluated quantitatively by the analysis of variance method (ANOVA).
Online since: September 2022
Authors: D.L. Mayta-Ponce, V.C. Bringas-Rodríguez, F.A. Cuzziramos-Gutiérrez, Fredy Alberto Huamán-Mamani, G.P. Rodríguez-Guillén
The mechanical performance of the mortars was affected by the poor interface between the geopolymer and Ichu fiber reinforcement.
Korniejenko, “Mechanical Properties of Wood Fiber Reinforced Geopolymer Composites with Sand Addition,” J.
Mikuła, “The overview of mechanical properties of short natural fiber reinforced geopolymer composites,” Environ.
Adamski, “Mechanical Properties of Geopolymer Composites Reinforced with Natural Fibers,” Procedia Eng., vol. 151, pp. 388–393, 2016, doi: 10.1016/j.proeng.2016.07.395
Low, “Synthesis and mechanical properties of cotton fabric reinforced geopolymer composites,” Compos.
Korniejenko, “Mechanical Properties of Wood Fiber Reinforced Geopolymer Composites with Sand Addition,” J.
Mikuła, “The overview of mechanical properties of short natural fiber reinforced geopolymer composites,” Environ.
Adamski, “Mechanical Properties of Geopolymer Composites Reinforced with Natural Fibers,” Procedia Eng., vol. 151, pp. 388–393, 2016, doi: 10.1016/j.proeng.2016.07.395
Low, “Synthesis and mechanical properties of cotton fabric reinforced geopolymer composites,” Compos.