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Online since: October 2014
Authors: Daria V. Lazurenko, Vitaliy V. Samoylenko, Olga G. Lenivtseva
In this study the structure and properties of surface layers obtained on cp-titanium workpieces by non-vacuum electron beam cladding of titanium carbide powder were investigated.
One of the promising techniques of titanium tribological properties improvement is the formation of hard coatings containing high-strength titanium carbide particles.
The high power beam injected to the atmosphere allows fabricating thick (up to 2 mm) high-quality coatings [11] without sacrificing properties of a base material.
Remy, Mechanical, structural and tribological properties of titanium nitrided by a pulsed laser, Surf.
Li, Microstructure and Mechanical Properties of an in situ Synthesized TiB and TiC Reinforced Titanium Matrix Composite Coating, J.
One of the promising techniques of titanium tribological properties improvement is the formation of hard coatings containing high-strength titanium carbide particles.
The high power beam injected to the atmosphere allows fabricating thick (up to 2 mm) high-quality coatings [11] without sacrificing properties of a base material.
Remy, Mechanical, structural and tribological properties of titanium nitrided by a pulsed laser, Surf.
Li, Microstructure and Mechanical Properties of an in situ Synthesized TiB and TiC Reinforced Titanium Matrix Composite Coating, J.
Online since: October 2006
Authors: Hyun Woo Lee, Gook Hyun Ha, Myung Hee Lee, Kong Hoon Lee, Ji Hun Yu, Seung Woo Han
The
electrical, thermal, thermoelectric and mechanical properties also obtained by the experiments.
Properties.
The mechanical properties of the materials were obtained using the nanoindentation method.
Table 1 Electrical, thermal and thermoelectric properties.
The electrical, thermal, thermoelectric and mechanical properties, which are required for FE analysis, were measured by the experiments.
Properties.
The mechanical properties of the materials were obtained using the nanoindentation method.
Table 1 Electrical, thermal and thermoelectric properties.
The electrical, thermal, thermoelectric and mechanical properties, which are required for FE analysis, were measured by the experiments.
Online since: February 2018
Authors: Poornesh Kumar Chaturvedi, Harendra Kumar Narang, Atul Kumar Sahu
The Surface roughness intensifies the appearance of the product and also impacts on the other surface properties such as reflectivity, lubricant transport, ability to weld, adhesion and mechanical properties due to strain localization [1].
There are number of factors that influence the Material Removal Rate and surface roughness like machining parameters, cutting tool material properties, work piece material properties, cutting conditions etc.
Based on L9 orthogonal array 9 sets of experiment with 3 level and 3 factors are conducted and are shown in Table1.
Three Factors and Three levels of Process Parameters.
Ince, Optimisation of parameters affecting surface roughness of Co28Cr6Mo medical material during CNC lathe machining by using the Taguchi and RSM methods, Measurement. 78 (2016) 120-128
There are number of factors that influence the Material Removal Rate and surface roughness like machining parameters, cutting tool material properties, work piece material properties, cutting conditions etc.
Based on L9 orthogonal array 9 sets of experiment with 3 level and 3 factors are conducted and are shown in Table1.
Three Factors and Three levels of Process Parameters.
Ince, Optimisation of parameters affecting surface roughness of Co28Cr6Mo medical material during CNC lathe machining by using the Taguchi and RSM methods, Measurement. 78 (2016) 120-128
Online since: September 2014
Authors: Hai Li Ye, Da Zhi Zhang
Introduction
The temperature of hot strip coiling is a key factor affecting the hot-rolling strip’s performance and mechanical properties.
As extreme temperatures will affect the microstructure and properties of the strip, strip cooling system must be controlled precisely to ensure the coiling temperature [1].
So the relationship between the thermal properties and temperature must be considered.
Formula 8 contains some actual physical parameters such as nozzle diameter, nozzle arrangement, and water's velocity in the laminar cooling zone, also contains the speed of the strip, current density, temperature and other factors of dynamic changes.
Application and conclusions 3.1 Application To improve the uniformity of the mechanical properties and microstructure of the strip, accurate mathematical models and control strategies have very important theoretical and practical significance.
As extreme temperatures will affect the microstructure and properties of the strip, strip cooling system must be controlled precisely to ensure the coiling temperature [1].
So the relationship between the thermal properties and temperature must be considered.
Formula 8 contains some actual physical parameters such as nozzle diameter, nozzle arrangement, and water's velocity in the laminar cooling zone, also contains the speed of the strip, current density, temperature and other factors of dynamic changes.
Application and conclusions 3.1 Application To improve the uniformity of the mechanical properties and microstructure of the strip, accurate mathematical models and control strategies have very important theoretical and practical significance.
Online since: August 2011
Authors: Ye Liu, Shu Yan Qi, Zheng Ying Shi
All of these factors urgently requested us to research and develop the new type buffer packaging materials which can be degraded, recycled and reused.
Table 1 Soaking in NaOH solution at different time affect the fiber diameter and density of material Index Processing time 0.5[h] 1[h] 2[h] 4[h] 6[h] Product density [g.cm-3] 0.1025 0.0971 0.0915 0.0887 0.0862 Cell diameter [mm] 0.0915 0.8769 0.8535 0.8975 0.9373 Analysis of material properties .
Analysed the impact of each component of the foam, the foam rate, density, diameter and mechanical properties of the cell, obtained more appropriate conditions combined bamboo foam.
Effect of Surface Treatment of Plant Fiber on Mechanical Properties of Fiber Composite, J.
Structure and properties of starch-based foams prepared by microwave heating from extruded pellets, J.
Table 1 Soaking in NaOH solution at different time affect the fiber diameter and density of material Index Processing time 0.5[h] 1[h] 2[h] 4[h] 6[h] Product density [g.cm-3] 0.1025 0.0971 0.0915 0.0887 0.0862 Cell diameter [mm] 0.0915 0.8769 0.8535 0.8975 0.9373 Analysis of material properties .
Analysed the impact of each component of the foam, the foam rate, density, diameter and mechanical properties of the cell, obtained more appropriate conditions combined bamboo foam.
Effect of Surface Treatment of Plant Fiber on Mechanical Properties of Fiber Composite, J.
Structure and properties of starch-based foams prepared by microwave heating from extruded pellets, J.
Online since: April 2018
Authors: Miodrag Arsić, Srđan M. Bošnjak, Vencislav Grabulov, Mladen Mladenović, Zoran Savić
Use of Non-Destructive Tests for the Assessment of Integrity and Service Life of Hydro-Mechanical Equipment
Miodrag Arsić1,a*, Srđan Bošnjak2,b, Vencislav Grabulov1,c,
Mladen Mladenović1,d, Zoran Savić1,e
1 Institute for materials testing, Bulevar vojvode Mišića Belgrade, Serbia
2 Faculty of Mechanical Engineering, Kraljice Marije 16, Belgrade
a*miodrag.arsić@institutims.rs, bsbosnjak@mas.bg.ac.rs, cvencislav.grabulov@institutims.rs, dmladen.mladenovic@institutims.rs, e zoran.savic@institutims.rs
Keywords: hydro turbine, non-destructive testing, degradation of material, structural integrity
Abstract.
Degradation of properties of the material and/or welded joints of hydro-mechanical equipment is being caused by the simultaneous influence of a large number of factors.
In this paper, the selection of methodology for the rehabilitation of hydro-mechanical equipment is presented based on the previously conducted assessment of state of equipment using the nondestructive testing methods.
In this paper the results of visual testing (VT), penetrant testing (PT) and magnetic particle testing (MT) in order to detect the surface defects, as well as results of ultrasonic testing in order to detect internal defects within welded joints (WJ), or, to put it differently, within weld metal (WM), heat affected zone (HAZ) and parent material (PM) have enabled the determination of causes of degradation of parent material and/or welded joints.
Degradation of properties of the material and/or welded joints of hydro-mechanical equipment is being caused by the simultaneous influence of a large number of factors.
In this paper, the selection of methodology for the rehabilitation of hydro-mechanical equipment is presented based on the previously conducted assessment of state of equipment using the nondestructive testing methods.
In this paper the results of visual testing (VT), penetrant testing (PT) and magnetic particle testing (MT) in order to detect the surface defects, as well as results of ultrasonic testing in order to detect internal defects within welded joints (WJ), or, to put it differently, within weld metal (WM), heat affected zone (HAZ) and parent material (PM) have enabled the determination of causes of degradation of parent material and/or welded joints.
Online since: March 2011
Authors: Ti Kun Shan, Li Liu
These mechanical properties of TRIP steel meet the increasing demand for lighter vehicle weight and better passive safety.
However, the parameters affecting the deformation behavior and the microscopic transformation mechanism are quite complicated, and it may be very difficult to determine a method for the improvement of the mechanical properties merely through experiments.
To obtain accurate numerical solutions, the material model for TRIP steels implemented in simulation algorithms should use reliable descriptions of the influence of the TRIP effect on the elastoplastic properties and the hardening curve [8].It must also take into account the sheet metal anisotropy.
But the TI model, which is applied widely to predict the mechanical properties for the TRIP steels, adopted the Mises yield function.
The TRIP multiphase steels exhibit superior material properties of high strength and good ductility due to strain induced martensitic transformation.
However, the parameters affecting the deformation behavior and the microscopic transformation mechanism are quite complicated, and it may be very difficult to determine a method for the improvement of the mechanical properties merely through experiments.
To obtain accurate numerical solutions, the material model for TRIP steels implemented in simulation algorithms should use reliable descriptions of the influence of the TRIP effect on the elastoplastic properties and the hardening curve [8].It must also take into account the sheet metal anisotropy.
But the TI model, which is applied widely to predict the mechanical properties for the TRIP steels, adopted the Mises yield function.
The TRIP multiphase steels exhibit superior material properties of high strength and good ductility due to strain induced martensitic transformation.
Online since: November 2013
Authors: Zhong Hu Zhao, Lan Ning Sun
Anyway, in any tunnel, an important problem to be considered is the stability of surrounding country rocks which is related to different factors such as the rock property, structure of rocks, underground water, natural stress state, geological structure, digging method of the tunnel, supporting method and supporting time [1], etc.
Among these, underground water rich in folds is difficult to solve because its complex properties make it very trouble to know its movement and existence state.
We therefore know that topography is an important factor that affect the collection of underground water, but not the only one.
The effecs of underground water on rocks The underground water existing in rocks interacts with surrounding rocks, which on the one hand affects the physical, chemical and mechanical properties of rocks and on the other hand affects its own physical and chemical characteristics.
Underground water affects the moisture content of rocks, change the pore-water pressure in rocks and bring mechanical effects.
Among these, underground water rich in folds is difficult to solve because its complex properties make it very trouble to know its movement and existence state.
We therefore know that topography is an important factor that affect the collection of underground water, but not the only one.
The effecs of underground water on rocks The underground water existing in rocks interacts with surrounding rocks, which on the one hand affects the physical, chemical and mechanical properties of rocks and on the other hand affects its own physical and chemical characteristics.
Underground water affects the moisture content of rocks, change the pore-water pressure in rocks and bring mechanical effects.
Online since: May 2007
Authors: Yong Li, Wei Feng Dong, Jun Xiao
The finite element software ANSYS was
adopted to study the mechanical properties of the model and presented its stress nephogram, and the
influence of the braided structure parameters on the elastic modulus of this material was analyzed in
detail.
To validate this model, qualified experimental samples were made by VARTM technique, and then tensile tests were performed to determine the mechanical properties.
It has better integral mechanical properties, which makes up effectively with the insufficiency of the 3-D fabrics in producing abnormal structure textile composites.
To make better full use of in industry, it is necessary to understand the effects of textile process and process parameters on mechanical properties, such as modulus, strength, impact and fatigue characteristics [1].
Later, Cox [5] and Xu [6] developed a finite element model, referred to a binary model, to predict the mechanical properties of 3-D angle interlock composites.
To validate this model, qualified experimental samples were made by VARTM technique, and then tensile tests were performed to determine the mechanical properties.
It has better integral mechanical properties, which makes up effectively with the insufficiency of the 3-D fabrics in producing abnormal structure textile composites.
To make better full use of in industry, it is necessary to understand the effects of textile process and process parameters on mechanical properties, such as modulus, strength, impact and fatigue characteristics [1].
Later, Cox [5] and Xu [6] developed a finite element model, referred to a binary model, to predict the mechanical properties of 3-D angle interlock composites.
Online since: May 2014
Authors: Shen Miao Zhu, Li Qun Du, Xiao Lei Zhang
The analytical result shows that post-baked temperature is the main effect factor on internal stress of SU-8 film.
The effect of the relevant factors on internal stress was investigated by finite element analysis and the internal stresses of SU-8 film on Si substrate at different post-baked temperatures were measured.
Axi-symmetry properties have been used to simplify the boundary conditions.
However, even though these factors affect the measurement accuracy of the curvature radius to some extent, the profile method is a preferable method for the internal stress measurement of SU-8 film due to its simple operation procedures and convenient calculation.
Zhao, Residual Stresses in Micro-Electro Mechanical Systems, Journal of Mechanical Strength, 23 (2001) 393-401.
The effect of the relevant factors on internal stress was investigated by finite element analysis and the internal stresses of SU-8 film on Si substrate at different post-baked temperatures were measured.
Axi-symmetry properties have been used to simplify the boundary conditions.
However, even though these factors affect the measurement accuracy of the curvature radius to some extent, the profile method is a preferable method for the internal stress measurement of SU-8 film due to its simple operation procedures and convenient calculation.
Zhao, Residual Stresses in Micro-Electro Mechanical Systems, Journal of Mechanical Strength, 23 (2001) 393-401.