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Online since: July 2015
Authors: Pierpaolo Carlone, Gaetano S. Palazzo, Rui M.F. Paulo, Filipe Teixeira-Dias, Robertt Valente
On the one hand, several setups of the mechanical boundary conditions, modelling the clamping systems, were also tested, leading to the conclusion that the results, in terms of longitudinal residual stresses, are significantly affected by this factor.
FSW is responsible for changes in the mechanical properties of the material, residual stresses and geometrical distortions, which must be taken into account in the design stages.
This small variation in the softening seems to be an additional factor affecting the longitudinal stresses, as show in Fig. 5(a).
The use of meshes with 1 and 0.5 mm elements increases the computational time by factors of 3 and 14, respectively.
Palazzo, Influence of process parameters on microstructure and mechanical properties in AA2024-T3 friction stir welding, Metallogaphy Microstrucure and Analysis, 2 (2013) 213-222
FSW is responsible for changes in the mechanical properties of the material, residual stresses and geometrical distortions, which must be taken into account in the design stages.
This small variation in the softening seems to be an additional factor affecting the longitudinal stresses, as show in Fig. 5(a).
The use of meshes with 1 and 0.5 mm elements increases the computational time by factors of 3 and 14, respectively.
Palazzo, Influence of process parameters on microstructure and mechanical properties in AA2024-T3 friction stir welding, Metallogaphy Microstrucure and Analysis, 2 (2013) 213-222
Online since: February 2018
Authors: Yuan Jun Sun, J. Sun, Wei Cheng Cao, Geng An
The purity of target materials greatly affects the properties of sputtered thin films and the higher the purity of target materials, the better the properties of sputtered thin films are.
In this research, the preparation process for Mo target was explored and then magnetron sputtering test was conducted in vacuum environment by using the prepared Mo target.The factors affected the microstructure and properties of Mo target and Mo thin films were analyzed and studied.
Influence Factors of Mo Thin Film Preparation.
Table 6 Electrical properties of Mo thin films with different sputtering currents.
Sun, Mechanical properties of molybdenum products prepared by using molybdenum powders with different micro-morphologies, Rare.
In this research, the preparation process for Mo target was explored and then magnetron sputtering test was conducted in vacuum environment by using the prepared Mo target.The factors affected the microstructure and properties of Mo target and Mo thin films were analyzed and studied.
Influence Factors of Mo Thin Film Preparation.
Table 6 Electrical properties of Mo thin films with different sputtering currents.
Sun, Mechanical properties of molybdenum products prepared by using molybdenum powders with different micro-morphologies, Rare.
Online since: September 2011
Authors: Bing Li, Jing Hui Lu, Jie Ouyang, Nan Xie
The research results of this paper are not only helpful to understand the laws of the mechanical properties of early-age shotcrete, but also provide some reference for the reliability analysis of tunnel under construction.
So the mechanical properties of the early-age shotcrete are very important for the safety of the tunnel.
Sand ratio of shotcrete is from 45% to 55% [3], which is higher than that of ordinary concrete. (4) Humidity and temperature inside the tunnel are less affected by the changes of external factors, so the service conditions of shotcrete are more stable than that of ordinary concrete.
Based on characteristics above-mentioned, the mechanical properties of the early-age shotcrete are different from that of ordinary concrete.
[11] GB/T50081-2002, Standard for test of mechanical properties on ordinary concrete(In Chinese)
So the mechanical properties of the early-age shotcrete are very important for the safety of the tunnel.
Sand ratio of shotcrete is from 45% to 55% [3], which is higher than that of ordinary concrete. (4) Humidity and temperature inside the tunnel are less affected by the changes of external factors, so the service conditions of shotcrete are more stable than that of ordinary concrete.
Based on characteristics above-mentioned, the mechanical properties of the early-age shotcrete are different from that of ordinary concrete.
[11] GB/T50081-2002, Standard for test of mechanical properties on ordinary concrete(In Chinese)
Online since: July 2015
Authors: Wen Bo Xu, Jia Wei Gu, Xiao Hai Zhang, Shi Hang Jiang
Effect of quenching temperature on the properties.
After different temperature 20SiMn2MoVA steel quenching heating to 200℃ tempering mechanical properties as shown in table 2.
Effect of tempering temperature on the properties.
The mechanical properties of 20SiMn2MoVA steel which quench heated at 920℃ and tempering at different temperature is shown in table 3.
Because martensite is supersaturated solid solution, thus tempering process will precipitate the second phase particles, which affects the mechanical properties of the material.
After different temperature 20SiMn2MoVA steel quenching heating to 200℃ tempering mechanical properties as shown in table 2.
Effect of tempering temperature on the properties.
The mechanical properties of 20SiMn2MoVA steel which quench heated at 920℃ and tempering at different temperature is shown in table 3.
Because martensite is supersaturated solid solution, thus tempering process will precipitate the second phase particles, which affects the mechanical properties of the material.
Online since: October 2021
Authors: Volodymyr Romaniuk, Sergii G. Guzii, Ihar Bazhelka, Svitlana Davydivna Lapovska
The article presents the results of studies of the effect of lithium, sodium, potassium and ammonium nitrates on the physical and mechanical properties of aluminosilicate adhesives intended for gluing wood and structures based on them.
In this work, the main emphasis will be on the effect of nitrate compounds on the physical and mechanical properties of aluminosilicate adhesives for gluing wood and wooden structures.
Further studies will present the results of the effect of nitrate additives on the deformation properties of adhesive joints and on the features of the physicochemical processes of structure formation occurring in aluminosilicate adhesives modified with nitrates and affecting both rheokinetic, colloidal-chemical, physical-mechanical and deformation properties.
Adhesives – Applications and Properties (2016). doi: https://doi.org/10.5772/65759 [4] S.I.
Kopylova, Study on physico-mechanical properties of the modified alkaline aluminosilicate adhesive-bonded timber elements.
In this work, the main emphasis will be on the effect of nitrate compounds on the physical and mechanical properties of aluminosilicate adhesives for gluing wood and wooden structures.
Further studies will present the results of the effect of nitrate additives on the deformation properties of adhesive joints and on the features of the physicochemical processes of structure formation occurring in aluminosilicate adhesives modified with nitrates and affecting both rheokinetic, colloidal-chemical, physical-mechanical and deformation properties.
Adhesives – Applications and Properties (2016). doi: https://doi.org/10.5772/65759 [4] S.I.
Kopylova, Study on physico-mechanical properties of the modified alkaline aluminosilicate adhesive-bonded timber elements.
Online since: May 2007
Authors: Ya Fang Han, Jin Xia Song, Cheng Bo Xiao, Qing Li
The die material is
one of critical factors for isothermal forging.
Effect of Hf, Zr, Ta, Nb on the tensile properties of DM02 alloy at 1050rC.
The tensile properties of the four specimens at 1050°C are shown in Table 3.
As above-mentioned, large primary M6C is detrimental to mechanical properties of the alloy, especially to ductility.
Therefore, 2# specimen would have good comprehensive properties.
Effect of Hf, Zr, Ta, Nb on the tensile properties of DM02 alloy at 1050rC.
The tensile properties of the four specimens at 1050°C are shown in Table 3.
As above-mentioned, large primary M6C is detrimental to mechanical properties of the alloy, especially to ductility.
Therefore, 2# specimen would have good comprehensive properties.
Online since: February 2011
Authors: Yi Luo, Chang Hua Du, Chun Tian Li, Jin He Liu
The indexes studied in experiments were nugget diameter and nugget deviation, which were the primary factors affecting the nugget morphology.
The differences of materials in properties of thickness, electric conductivity and thermal conductivity influence the heat distribution in weld during RSW, which affects the nugget morphology.
Some experimental studies focused on the connections between the nugget diameter, nugget height and mechanical property of weld, and demonstrated the nugget size has a significant effect on mechanical property [5].
Therefore, the thermal effect depends on the three factors, namely welding current, duration of welding current and resistance property of material.
Fig.7 is the impact of process parameters, especially the welding current, affecting on nugget deviation.
The differences of materials in properties of thickness, electric conductivity and thermal conductivity influence the heat distribution in weld during RSW, which affects the nugget morphology.
Some experimental studies focused on the connections between the nugget diameter, nugget height and mechanical property of weld, and demonstrated the nugget size has a significant effect on mechanical property [5].
Therefore, the thermal effect depends on the three factors, namely welding current, duration of welding current and resistance property of material.
Fig.7 is the impact of process parameters, especially the welding current, affecting on nugget deviation.
Online since: December 2014
Authors: Martin Kubelka, Tomáš Pačák, František Tatíček
During pressing using high speed, the material is stressed to the limit of its mechanical properties.
For this reason, opens debate on the factors previously neglected, such as the strain rate.
If the material is stressed dynamically, an important role is played by factors that can be neglected in quasi-static loads.
These factors include the strain rate, temperature, final degree of deformation, the effect of inertial forces, structural changes or the range of tension forces [1].
Despite the main purpose of this experimental equipment, i.e. monitoring the response of the material on the applied strain rate, this device can also be used to monitor other factors affecting the forming processes.
For this reason, opens debate on the factors previously neglected, such as the strain rate.
If the material is stressed dynamically, an important role is played by factors that can be neglected in quasi-static loads.
These factors include the strain rate, temperature, final degree of deformation, the effect of inertial forces, structural changes or the range of tension forces [1].
Despite the main purpose of this experimental equipment, i.e. monitoring the response of the material on the applied strain rate, this device can also be used to monitor other factors affecting the forming processes.
Online since: May 2006
Authors: M.P. Hofmann, R.M. Shelton, S. Chauhan
Chad's Queensway, Birmingham, B4 6NN, UK
a
m.p.hofmann@bham.ac.uk , b r.m.shelton@bham.ac.uk
Keywords: brushite, protein addition, mechanical properties, setting time, bone cement
Abstract.
The setting time was not affected by adding albumin and FBS but was increased by 50% with admixtures containing fibrinogen.
Another explanation for the strength decrease may have been a change in microstructure and therefore crystal entanglement of the precipitated brushite leading to lower mechanical strength as found by Knepper-Nicolai et al. in a study on the effect of osteocalcin on the properties of a hydroxyapatite forming calcium phosphate cement [7].
Protein addition to the liquid phase may have resulted in a lower conversion rate, thereby affecting strength.
Conclusion This study clearly indicated that the inevitable mixing of proteins, protein mixtures or serum even at low concentrations with the calcium phosphate bone cement during use is a crucial factor in determining the setting behaviour and final mechanical strength of such materials and needs to be considered during future development of bone cements.
The setting time was not affected by adding albumin and FBS but was increased by 50% with admixtures containing fibrinogen.
Another explanation for the strength decrease may have been a change in microstructure and therefore crystal entanglement of the precipitated brushite leading to lower mechanical strength as found by Knepper-Nicolai et al. in a study on the effect of osteocalcin on the properties of a hydroxyapatite forming calcium phosphate cement [7].
Protein addition to the liquid phase may have resulted in a lower conversion rate, thereby affecting strength.
Conclusion This study clearly indicated that the inevitable mixing of proteins, protein mixtures or serum even at low concentrations with the calcium phosphate bone cement during use is a crucial factor in determining the setting behaviour and final mechanical strength of such materials and needs to be considered during future development of bone cements.
Online since: July 2013
Authors: W. Kasprzak, Frank Czerwinski
The limited strengthening response linked to the crystallographic structure of magnesium along with the low integrity of castings, are seen as the major detrimental factors affecting the application scale.
It intends to help in establishing the suitable procedure to achieve the required physical and mechanical properties.
AN IMPROVEMENT IN MECHANICAL PROPERTIES IS THE KEY OBJECTIVE OF HEAT TREATMENT.
THE GENERAL FACTORS AFFECTING CORROSION RESISTANCE OF MAGNESIUM ARE THE SAME AS THOSE IMPORTANT FOR OTHER ENGINEERING ALLOYS.
THE HEAT TREATMENT ALSO AFFECTS THE ELECTROCHEMICAL PROPERTIES OF ANODIC FILMS, FORMED ON MAGNESIUM SURFACES.
It intends to help in establishing the suitable procedure to achieve the required physical and mechanical properties.
AN IMPROVEMENT IN MECHANICAL PROPERTIES IS THE KEY OBJECTIVE OF HEAT TREATMENT.
THE GENERAL FACTORS AFFECTING CORROSION RESISTANCE OF MAGNESIUM ARE THE SAME AS THOSE IMPORTANT FOR OTHER ENGINEERING ALLOYS.
THE HEAT TREATMENT ALSO AFFECTS THE ELECTROCHEMICAL PROPERTIES OF ANODIC FILMS, FORMED ON MAGNESIUM SURFACES.