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Online since: June 2015
Authors: Jose Cherian, Jeoju M. Issac
Wear properties of mild steel are considerably affected by the process parameters of AFM.The effect of extrusion pressure, abrasive concentration and abrasive size during AFM on wear performance were investigated using a reciprocating wear testing machine.
Introduction Different machining operations will produce surfaces with different mechanical properties.
Hiroyuki et .al[4] found that surface properties like surface hardness, surface roughness, residual stress etc are affected by the cutting conditions like feed rate, shape of cutting edge and nose radius.
Jose Cherian et.al [5] reported that AFM will improve the fatigue properties of materials.
The abrasive concentration, interaction between abrasive size & extrusion pressure and the interaction between all the three variables are the major contributing factors for the increase in wear resistance during AFM.
Introduction Different machining operations will produce surfaces with different mechanical properties.
Hiroyuki et .al[4] found that surface properties like surface hardness, surface roughness, residual stress etc are affected by the cutting conditions like feed rate, shape of cutting edge and nose radius.
Jose Cherian et.al [5] reported that AFM will improve the fatigue properties of materials.
The abrasive concentration, interaction between abrasive size & extrusion pressure and the interaction between all the three variables are the major contributing factors for the increase in wear resistance during AFM.
Online since: December 2012
Authors: Shi Zheng, Chuan Feng Zheng
Factors of Adhesion between Asphalt and Mineral Aggregates
Chuanfeng Zheng 1,a, Shi Zheng 2,b
1College of Construction Engineering, Jilin University, Changchun, Jilin Prov, P.R.
The interaction may be in the form of chemical bonding, mechanical connection, or both.
(1) Effects of the studied factors Preparation temperature of the mixture.
The significant differences among the properties and structures of the main components of the minerals influence the contact angle between the asphalt and mineral aggregate.
Compatibility of multi-factors and the calculation of the adhesion work The surface tension cannot be combined with the contact angle in a single analysis.
The interaction may be in the form of chemical bonding, mechanical connection, or both.
(1) Effects of the studied factors Preparation temperature of the mixture.
The significant differences among the properties and structures of the main components of the minerals influence the contact angle between the asphalt and mineral aggregate.
Compatibility of multi-factors and the calculation of the adhesion work The surface tension cannot be combined with the contact angle in a single analysis.
Online since: July 2016
Authors: Nur Ain Jaya, Che Mohd Ruzaidi Ghazali, Hussin Kamarudin, Mohammed Binhussain, A.M. Mustafa Al Bakri, Romisuhani Ahmad
This paper reports the effect of temperature on the physical, mechanical properties and characteristics of kaolin geopolymer ceramic.
The type of alkali ion, Si/Al ratio and crystal structure themselves are the important factors included [16-18].
Table 2 concludes the mechanical properties of 12M0.24 kaolin geopolymer ceramic at different sintering temperature.
It proved that higher temperature (up to 1200 °C) does help to enhance the mechanical properties.
Sagoe-Crentsil, "Factors affecting the performance of metakaolin geopolymers exposed to elevated temperatures," Journal of Materials Science, vol. 43, pp. 824-831, 2008
The type of alkali ion, Si/Al ratio and crystal structure themselves are the important factors included [16-18].
Table 2 concludes the mechanical properties of 12M0.24 kaolin geopolymer ceramic at different sintering temperature.
It proved that higher temperature (up to 1200 °C) does help to enhance the mechanical properties.
Sagoe-Crentsil, "Factors affecting the performance of metakaolin geopolymers exposed to elevated temperatures," Journal of Materials Science, vol. 43, pp. 824-831, 2008
Online since: May 2014
Authors: Antonio Contreras-Cuevas, Ricardo Galván-Martínez, O. Vega-Becerra, S.L. Hernández-Mejía
Relation between microstructure, mechanical properties and residual stresses was carried out.
Relation between microstructure, mechanical properties and residual stresses was carried out.
The average grain size and some mechanical properties were evaluated in the weldments obtained.
Effect of the residual stresses on the mechanical properties.
Relation between microstructure, mechanical properties and residual stresses was carried out.
Relation between microstructure, mechanical properties and residual stresses was carried out.
The average grain size and some mechanical properties were evaluated in the weldments obtained.
Effect of the residual stresses on the mechanical properties.
Relation between microstructure, mechanical properties and residual stresses was carried out.
Online since: December 2016
Authors: Kristaps Rubenis, Janis Locs
Introduction
Physicochemical properties of nanomaterials are greatly affected by their morphology.
Additionally, gas sensing properties towards 100 ppm ethanol vapor of the synthesized materials were tested.
Since gas sensitivity of SnO2 to a great extent depends on the presence of various defects in its crystal structure, possibly the co-solvents used have differently affected their formation and as a result they could affect gas sensing properties of the synthesized structures [8].
Li, Hydrothermal synthesis of novel SnO2 nanoflowers and their gas-sensing properties, Matter.
Liu, Enhanced gas sensing properties of SnO2: the role of the oxygen defects induced by quenching, J.
Additionally, gas sensing properties towards 100 ppm ethanol vapor of the synthesized materials were tested.
Since gas sensitivity of SnO2 to a great extent depends on the presence of various defects in its crystal structure, possibly the co-solvents used have differently affected their formation and as a result they could affect gas sensing properties of the synthesized structures [8].
Li, Hydrothermal synthesis of novel SnO2 nanoflowers and their gas-sensing properties, Matter.
Liu, Enhanced gas sensing properties of SnO2: the role of the oxygen defects induced by quenching, J.
Online since: April 2012
Authors: S.S.R. Koloor, Redzuan Abdullah, M. Joshani
Cohesive fracture properties such as fracture energy and initiation stress were derived from horizontal shear bond stress versus end slip curves.
The nonlinear behavior of concrete material is attributed to two distinct material’s mechanical properties; plasticity and damage mechanisms.
Table 1: Concrete mechanical and brittle cracking properties used in the FE model [5].
Table 2: Steel properties used in the finite element model [5].
for the cohesive element properties, such as the area under the traction separation curve and the initial stiffness of the cohesive zone.
The nonlinear behavior of concrete material is attributed to two distinct material’s mechanical properties; plasticity and damage mechanisms.
Table 1: Concrete mechanical and brittle cracking properties used in the FE model [5].
Table 2: Steel properties used in the finite element model [5].
for the cohesive element properties, such as the area under the traction separation curve and the initial stiffness of the cohesive zone.
Online since: September 2011
Authors: Jin Li Miao, Wen Nie
The methods of obtaining these properties decides the project design’s safety and reasonable.
In this paper, at first, the author analyzes the size effect factors.
Rock mass failure strength and size effect Size effect exists in natural among many factors affecting to rock mass strength which directly affect the strength parameter used to project.
But it has not considering the rock mass creep characteristics, namely, the properties of rock mass is the function of time.
We only know the rock mass strength in qualitative based on the uniaxial compression strength which is one of the factor affecting rock mass stability.
In this paper, at first, the author analyzes the size effect factors.
Rock mass failure strength and size effect Size effect exists in natural among many factors affecting to rock mass strength which directly affect the strength parameter used to project.
But it has not considering the rock mass creep characteristics, namely, the properties of rock mass is the function of time.
We only know the rock mass strength in qualitative based on the uniaxial compression strength which is one of the factor affecting rock mass stability.
Online since: January 2012
Authors: Diego Mantovani, P. Chevallier, Alejandra Reyna-Valencia
In the present work, the gelation process and the resulting morphological and mechanical properties of collagen/laponite clay nanocomposite hydrogels were invastigated.
In particular, the mechanical properties of the synthetic materials based on reconstituted collagen require improvement [1].
From the above discussion, we suppose that clay particles interact with the protein at the fibril stage, possibly affecting fibril growth and arrangement in the matrix.
Mechanical Properties.
Moreover, electrostatic forces may stabilize the network, yielding better mechanical properties [20].
In particular, the mechanical properties of the synthetic materials based on reconstituted collagen require improvement [1].
From the above discussion, we suppose that clay particles interact with the protein at the fibril stage, possibly affecting fibril growth and arrangement in the matrix.
Mechanical Properties.
Moreover, electrostatic forces may stabilize the network, yielding better mechanical properties [20].
Online since: January 2016
Authors: Peter Raffai, Jozef Dlugoš, Pavel Novotný
It includes different properties of lubricating oil (pressure and temperature dependent viscosity and density) and elastic deformations, so the pressure distribution in an oil film can be evaluated.
Other situation occurs when hydrodynamic pressure is causing the active surfaces to deform, changing the oil film thickness shape and affecting the pressure distribution reversely (EHD).
Therefore, safety factors, estimated by both solution methods, are very similar.
· Areas A5 and A6 are the most affected ones.
It resulted in the same endurance safety factors of the connecting rod at all regions except slide bearing.
Other situation occurs when hydrodynamic pressure is causing the active surfaces to deform, changing the oil film thickness shape and affecting the pressure distribution reversely (EHD).
Therefore, safety factors, estimated by both solution methods, are very similar.
· Areas A5 and A6 are the most affected ones.
It resulted in the same endurance safety factors of the connecting rod at all regions except slide bearing.
Online since: November 2013
Authors: Andrzej Nowotnik, Paweł Rokicki, Slawomir Kotowski, Grazyna Mrówka-Nowotnik, Jan Sieniawski, Paweł Pędrak
It may allow to run a safe plastic deformation process of given precipitation hardened superalloys and make possible prediction of suitable microstructures from overcooled austenite after heat treatment with application of various cooling rate, what is to determine final properties of such an alloy.
These factors affect strengthening kinetics and changes of the microstructure and at the end the mechanical properties of a material [1-4].
Activation energy Q for the deformation process of CMXS-4 is strongly affected by temperature and strain rate (Table 1).
Basing on the diagrams - Fig. 4 and 5, the factors were determined in order to estimate the mean value of activation energy (Q) of high-temperature deformation process of examined alloy- Q=779,46 kJ/mol.
JONAS: Dynamic recrystallization: mechanical and microstructural consideration.
These factors affect strengthening kinetics and changes of the microstructure and at the end the mechanical properties of a material [1-4].
Activation energy Q for the deformation process of CMXS-4 is strongly affected by temperature and strain rate (Table 1).
Basing on the diagrams - Fig. 4 and 5, the factors were determined in order to estimate the mean value of activation energy (Q) of high-temperature deformation process of examined alloy- Q=779,46 kJ/mol.
JONAS: Dynamic recrystallization: mechanical and microstructural consideration.