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Online since: April 2012
Authors: A. Gómez, Mariano Marcos, Moises Batista, Jorge Salguero Gómez, M. Alvarez
Minimizing downtime in machine tools is one of the factors that determine the performance increase of the production processes involved.
Machining processes can be stopped by needing to change the tool as a consequence of the loss of their initial properties due to the wear process that suffer during machining.
In the case of machining, the machine downtime is one of the most critical factors, since these time intervals -in which the machine does not produce- make to decrease the production process performance [1].
However, one of the most common causes of machine stops undesirable (and therefore of the production) is due to the loss of the initial properties of the tool, both in terms of its geometry as in related to their physicochemical properties.
Lower speeds are the most affected by this effect, since at low speeds, appears the greatest amount of material adhered on the rake face.
Machining processes can be stopped by needing to change the tool as a consequence of the loss of their initial properties due to the wear process that suffer during machining.
In the case of machining, the machine downtime is one of the most critical factors, since these time intervals -in which the machine does not produce- make to decrease the production process performance [1].
However, one of the most common causes of machine stops undesirable (and therefore of the production) is due to the loss of the initial properties of the tool, both in terms of its geometry as in related to their physicochemical properties.
Lower speeds are the most affected by this effect, since at low speeds, appears the greatest amount of material adhered on the rake face.
Online since: July 2011
Authors: Yun Mook Lim, Kunhwi Kim, John E. Bolander
The mechanical properties of concrete materials vary with the loading rate under dynamic
conditions, which can influence the dynamic fracture behavior of structures.
Introduction In dynamic conditions, the responses of structural members are affected by the subjected loading rates.
The properties of concrete are kept from the direct tensile test and the calibrated visco-plastic parameters are also applied here.
The mechanical properties of several kinds of concrete at compressive, tensile, and flexural tests in high rates of loading.
Concrete: Structure, Properties, and Materials, pages 85--86.
Introduction In dynamic conditions, the responses of structural members are affected by the subjected loading rates.
The properties of concrete are kept from the direct tensile test and the calibrated visco-plastic parameters are also applied here.
The mechanical properties of several kinds of concrete at compressive, tensile, and flexural tests in high rates of loading.
Concrete: Structure, Properties, and Materials, pages 85--86.
Online since: November 2021
Authors: Francisco Hernández-Olivares, Ramiro Correa-Jaramillo, Berenice Zúñiga-Torres, Alonso Zúñiga-Suárez, Israel Briceño-Tacuri
The mechanical properties of bricks as simple compression and flexural strength, are simulated and obtained, applying the experimental Griffith criterion and method finite element simulation method.
This kind of ceramic waste has great potential to be recycled and reused in various industries, being an environmentally friendly alternative through sustainable management in the development of new materials for construction [3] Zúñiga [4] in his research indicates that the fabrication process has not been industrialized in Ecuador, so its properties are seriously affected due to original brick materials not reach the correct firing temperature.
Mechanical characteristics.
Attribute control Property Result Color 7.5 YR 4/7 Consistency Loose Texture Sandy Chemical-mineralogical analysis.
Brick wastes samples Mechanical analysis.
This kind of ceramic waste has great potential to be recycled and reused in various industries, being an environmentally friendly alternative through sustainable management in the development of new materials for construction [3] Zúñiga [4] in his research indicates that the fabrication process has not been industrialized in Ecuador, so its properties are seriously affected due to original brick materials not reach the correct firing temperature.
Mechanical characteristics.
Attribute control Property Result Color 7.5 YR 4/7 Consistency Loose Texture Sandy Chemical-mineralogical analysis.
Brick wastes samples Mechanical analysis.
Online since: January 2013
Authors: Qi Ming Li, Ying Lu, Yong Liang Deng
This study indicates that the spacing of anchor bolt affects the deformation most, followed by the length of anchor bolt and pre-stress.
The most remarkable characteristic of red clay is poor physical property index but good mechanical property.
In 1937, Terzaghi raised the mechanical property of soil, namely strain softening, which shows the peak strength of fissured clay drops with the increase of strain.
There are many factors impacting the deformation control of foundation projects, so practical projects shall pursue reasonable stability and deformation design on the economical and reasonable basis.
[9] Zhujiang Shen, Theoretical Soil Mechanics, China Conservancy & Electricity Press, Beijing, 2000 [10] Yiling Liao etc, Variation of engineering properties of red clay in South China, Guizhou Science, 36(2008) 304-319
The most remarkable characteristic of red clay is poor physical property index but good mechanical property.
In 1937, Terzaghi raised the mechanical property of soil, namely strain softening, which shows the peak strength of fissured clay drops with the increase of strain.
There are many factors impacting the deformation control of foundation projects, so practical projects shall pursue reasonable stability and deformation design on the economical and reasonable basis.
[9] Zhujiang Shen, Theoretical Soil Mechanics, China Conservancy & Electricity Press, Beijing, 2000 [10] Yiling Liao etc, Variation of engineering properties of red clay in South China, Guizhou Science, 36(2008) 304-319
Online since: September 2013
Authors: Li Wei, Obed Akampumuza, Shi Peng
Characterization and analysis of silane treatment on the morphological and absorption properties of banana fibers
Akampumuza Obed1, a, Shi Peng2, b and Wei Li 3, c
College of Textile Science and Engineering, Donghua University, 210620 Shanghai, P.
Cellulose a glucose polymer is crystalline in nature and is largely responsible for the fiber’s physical, mechanical and chemical properties, hemicellulose is a group of polysaccharides differentiated from cellulose by its structure, lignin another major component of the fiber structure, is an amorphous hydrocarbon polymer consisting of both aromatic and aliphatic groups[6].
This because, the surfaces of the raw fibers have impurities and surface coatings such as wax and pectin which are removed during the alkaline treatment exposing the sharp edges of those fiber components which are not affected by NaOH.
Mwaikambo, L.Y., Review of the history, properties and applications of plant fibers.
Kabir, M.M., et al., Tensile properties of chemically treated hemp fibres as reinforcement for composites.
Cellulose a glucose polymer is crystalline in nature and is largely responsible for the fiber’s physical, mechanical and chemical properties, hemicellulose is a group of polysaccharides differentiated from cellulose by its structure, lignin another major component of the fiber structure, is an amorphous hydrocarbon polymer consisting of both aromatic and aliphatic groups[6].
This because, the surfaces of the raw fibers have impurities and surface coatings such as wax and pectin which are removed during the alkaline treatment exposing the sharp edges of those fiber components which are not affected by NaOH.
Mwaikambo, L.Y., Review of the history, properties and applications of plant fibers.
Kabir, M.M., et al., Tensile properties of chemically treated hemp fibres as reinforcement for composites.
Online since: July 2012
Authors: Zi Li Yu, Ling Luo, Xing Wang, Yun Liu
GRT cannot be used in large quantity in a rubber compound because of its poor mechanical property and processability.
For a certain GRT/plastic compound, the adhesion between them is a key factor affecting properties.
The mechanical properties of GRT/HDPE using GRT-g-MAH, E/nBA/CO, SBS and EVA respectively as compatilizer were listed in Table 1.
The GRT and GRT-g-MAH have different structure and thermal properties.
The GRT-g-MAH can be used as a compatilizer for GRT/HDPE blending for achieving better mechanical property.
For a certain GRT/plastic compound, the adhesion between them is a key factor affecting properties.
The mechanical properties of GRT/HDPE using GRT-g-MAH, E/nBA/CO, SBS and EVA respectively as compatilizer were listed in Table 1.
The GRT and GRT-g-MAH have different structure and thermal properties.
The GRT-g-MAH can be used as a compatilizer for GRT/HDPE blending for achieving better mechanical property.
Online since: November 2025
Authors: Josef Duliškovič, Marek Vostřák, Šárka Houdková
For each material set, three different deposition parameters were selected, with the variable factors being oxygen flow and kerosene flow.
The measured KiC values, along with other mechanical properties, are listed in Table 3.
Porosity results, along with additional measured mechanical properties, are listed in Table 3.
Shinoda, Effects of carbide size and Co content on the microstructure and mechanical properties of HVOF-sprayed WC–Co coatings.
Tricoteaux, Mechanical Properties of Ceramic by Indentation: Principle and Applications.
The measured KiC values, along with other mechanical properties, are listed in Table 3.
Porosity results, along with additional measured mechanical properties, are listed in Table 3.
Shinoda, Effects of carbide size and Co content on the microstructure and mechanical properties of HVOF-sprayed WC–Co coatings.
Tricoteaux, Mechanical Properties of Ceramic by Indentation: Principle and Applications.
Online since: February 2026
Authors: Payel Das
Anisotropic properties are observed as different behaviour is shown between the c-axis and a/b axes.
Grain size and its distribution influence mechanical properties such as strength, ductility, toughness etc.
A narrow Gaussian peak having small standard deviation indicates high grain uniformity, which is desirable for consistent mechanical, electrical, and optical properties.
During solid state synthesis process, variations in oxygen stoichiometry may influence the electronic structure and carrier concentration affecting the potential for superconductivity in the Nd1-xSrxNiO2 system [6].
Vasil'ev et al., Magnetic and transport properties of electron-doped high-Tc superconductors, Phys.
Grain size and its distribution influence mechanical properties such as strength, ductility, toughness etc.
A narrow Gaussian peak having small standard deviation indicates high grain uniformity, which is desirable for consistent mechanical, electrical, and optical properties.
During solid state synthesis process, variations in oxygen stoichiometry may influence the electronic structure and carrier concentration affecting the potential for superconductivity in the Nd1-xSrxNiO2 system [6].
Vasil'ev et al., Magnetic and transport properties of electron-doped high-Tc superconductors, Phys.
Online since: September 2013
Authors: Ji Jun Luo, Jun Xu, Qing Hua Zhang, Su Xia Hou
Introduction
Two-phase flow instability is an important problem that affects the running of SG (steam generator) in nuclear reactor systems.
The flow instability is undesirable as it may result in sustained flow oscillations, which can cause mechanical vibrations, problems of system control and boiling crisis [1].
Because the perturbation of heat flux is time and space dependent, each region of heated section is subdivided axially into small control volumes within which heat flux profile, heat transfer coefficient and some other factors are assumed to be uniform.
Table 1 Geometry and operating parameters Properties Symbol Value(Unit) Properties Symbol Value(Unit) Tube inside diameter di 0.0125(m) Pressure of the secondary side P2 3.2(MPa) Heated length L 1.3(m) Inlet subcooling Tsub 0.0-220.0(℃) Tube outside diameter do 0.0150 (m) Mass flow rate W 220 (Kg/(m2﹒s) Pressure of the first side P1 15.1(MPa) Inlet orifice loss coefficient ki 0-1200 Fig 4.
Furthermore, Figure 6 also shows that changes in coupling factor affect the stability of the system.
The flow instability is undesirable as it may result in sustained flow oscillations, which can cause mechanical vibrations, problems of system control and boiling crisis [1].
Because the perturbation of heat flux is time and space dependent, each region of heated section is subdivided axially into small control volumes within which heat flux profile, heat transfer coefficient and some other factors are assumed to be uniform.
Table 1 Geometry and operating parameters Properties Symbol Value(Unit) Properties Symbol Value(Unit) Tube inside diameter di 0.0125(m) Pressure of the secondary side P2 3.2(MPa) Heated length L 1.3(m) Inlet subcooling Tsub 0.0-220.0(℃) Tube outside diameter do 0.0150 (m) Mass flow rate W 220 (Kg/(m2﹒s) Pressure of the first side P1 15.1(MPa) Inlet orifice loss coefficient ki 0-1200 Fig 4.
Furthermore, Figure 6 also shows that changes in coupling factor affect the stability of the system.
Online since: July 2014
Authors: Sheng Ji Jin, Zhong Liang Li, Yan Ling Wang, Jian Zhang
The concrete composite material with basalt fiber as enhancing system in it has a lot of advantages ,including excellent mechanical properties , high temperature resistant, resistant to acid and alkali, low cost, environmental protection materials and resistance production process.
Damage of northern environment of freezing and thawing on the properties of the composite material has become a new hot issue.
We can use CBF as reinforcement to make all kinds of excellent properties.
But current research on the properties of basalt fiber concrete frost resistance is relatively limited.
Thus, concrete reinforced by basalt fiber can effectively improve the frost resistance itself, and it has the best antifreeze performance with 0.3% basalt fiber. 4.2 Experiment Result Analysis The main factors influencing the concrete freeze-thaw performance has two aspects.
Damage of northern environment of freezing and thawing on the properties of the composite material has become a new hot issue.
We can use CBF as reinforcement to make all kinds of excellent properties.
But current research on the properties of basalt fiber concrete frost resistance is relatively limited.
Thus, concrete reinforced by basalt fiber can effectively improve the frost resistance itself, and it has the best antifreeze performance with 0.3% basalt fiber. 4.2 Experiment Result Analysis The main factors influencing the concrete freeze-thaw performance has two aspects.