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Online since: October 2022
Authors: Nabaa Mohammed Bader, Khudheyer S. Mushatet
[4, 5] looked into the heat transfer properties of a rectangular duct with a compact delta-wing and winglet pair.
Gentry and Jacobi [16,17] attempted to evaluate the enhancement properties of delta wing vortex generators in a smooth duct flow.
However, discontinuous ribs had the highest friction factor values, whereas continuous ribs had the minimal performance factor among the cases examined.
The winglet height ratio (e/H) and varying solar irradiance are considered major factors influencing the thermal performance evaluation of the solar air dryer.
The cause might be related to mechanical power superiority, which is necessary to overcome frictional resistance in the duct.
Gentry and Jacobi [16,17] attempted to evaluate the enhancement properties of delta wing vortex generators in a smooth duct flow.
However, discontinuous ribs had the highest friction factor values, whereas continuous ribs had the minimal performance factor among the cases examined.
The winglet height ratio (e/H) and varying solar irradiance are considered major factors influencing the thermal performance evaluation of the solar air dryer.
The cause might be related to mechanical power superiority, which is necessary to overcome frictional resistance in the duct.
Online since: January 2013
Authors: Min Huang
Introduction
Reinforced concrete has only a history of more than 100 years from the beginning of the 19th century up to now, although compared with the masonry structure and the steel structure, its history is not long, but as a result of continuous improvement of the concrete and steel material properties, the progress on the structure theory construction technology make its development is very rapid.
The Characteristics of the Steel Structure Performance Based on Filling Technology Reinforced concrete structure is made of two materials, and the steel and concrete are combined into a whole common mechanical engineering structure, of which the main beard component is built with reinforced concrete, reinforcement under tension and concrete under pressure.
Although the existence of crack doesn't necessarily mean that structure will be destroyed, but it affects the durability of the steel structure and beautiful.
Overview of the Ductility Performance The used variables for description of ductility include the material toughness, curvature ductility factor of the cross section, displacement ductility coefficient of the component or structural, plastic hinge rotation capacity, hysteretic curve ( as shown), energy dissipation capacity.
The Factors of Influencing Component Ductility (1)The longitudinal reinforcement ratio Experiments show that when the beam of longitudinal tensile reinforcement ratio is very high, and the moment when the maximum is reached, the curvature curve of the bending moment soon decline; When the reinforcement ratio is low, the moment after reaching the maximum can be maintained for a long horizontal section, thus greatly improving the ductility and energy dissipation capacity.
The Characteristics of the Steel Structure Performance Based on Filling Technology Reinforced concrete structure is made of two materials, and the steel and concrete are combined into a whole common mechanical engineering structure, of which the main beard component is built with reinforced concrete, reinforcement under tension and concrete under pressure.
Although the existence of crack doesn't necessarily mean that structure will be destroyed, but it affects the durability of the steel structure and beautiful.
Overview of the Ductility Performance The used variables for description of ductility include the material toughness, curvature ductility factor of the cross section, displacement ductility coefficient of the component or structural, plastic hinge rotation capacity, hysteretic curve ( as shown), energy dissipation capacity.
The Factors of Influencing Component Ductility (1)The longitudinal reinforcement ratio Experiments show that when the beam of longitudinal tensile reinforcement ratio is very high, and the moment when the maximum is reached, the curvature curve of the bending moment soon decline; When the reinforcement ratio is low, the moment after reaching the maximum can be maintained for a long horizontal section, thus greatly improving the ductility and energy dissipation capacity.
Online since: April 2018
Authors: Tetsuo Oya, Shin Onoshima
Multiscale modeling is a model that relates the mechanical characteristics between microscopic and macroscopic scale.
Material properties of the test sheet metal.
However, considering the effect of uncertainty factors, such as crystal lattice defects and non-uniform thermal effect induced by the heat treatment process, it is possible to assume that work-hardening laws on each slip system differs slightly.
M0 is Taylor’s factor and usually set to 3.07.
In elastic region, however, work-hardening expression, n-power law in this analysis, affected the form of the curve.
Material properties of the test sheet metal.
However, considering the effect of uncertainty factors, such as crystal lattice defects and non-uniform thermal effect induced by the heat treatment process, it is possible to assume that work-hardening laws on each slip system differs slightly.
M0 is Taylor’s factor and usually set to 3.07.
In elastic region, however, work-hardening expression, n-power law in this analysis, affected the form of the curve.
Online since: September 2011
Authors: Chuan Zhao, Jun Bo Wang, Isao Tabata, Teruo Hori
Introduction
In recent years, studies have found that new properties of polymers may be generated by doping functional molecules or compound e.g., dye molecules, and drug molecules into the polymers.
Many research groups observed that incorporating the fluorescent dyes into POFs, resulted in highly efficient lasing properties and optical parametric amplification.
Incorporation of functional molecules into the polymer material imparts various distinctive properties [7].
The methanol used for modifying the solubility properties of CO2 fluids is in guaranteed-grade reagent form and was used without further purification.
All these factors contribute in the increase of the intermolecular forces between rhodamine and carbon dioxide molecules, and promote the dissolution of rhodamine in scCO2.
Many research groups observed that incorporating the fluorescent dyes into POFs, resulted in highly efficient lasing properties and optical parametric amplification.
Incorporation of functional molecules into the polymer material imparts various distinctive properties [7].
The methanol used for modifying the solubility properties of CO2 fluids is in guaranteed-grade reagent form and was used without further purification.
All these factors contribute in the increase of the intermolecular forces between rhodamine and carbon dioxide molecules, and promote the dissolution of rhodamine in scCO2.
Online since: April 2016
Authors: Maciej Motyka, Waldemar Ziaja, Jan Sieniawski
Therefore it was assumed that martensitic transformation β→α’(α”) during water quenching preceding plastic working in TMP affects grain refinement efficiency during plastic deformation.
Water quenching preceding forging in TMP causes increase of deformed αE grain elongation factors – from fα = 2,1 – without quenching – to 3,6 and 6,8 after α+β↔β and β range quenching respectively (Fig. 2d-e).
Maximum elongation factor fα was achieved for in hot forging after β quenching (fα 6,8).
Picu, Mechanical behavior of Ti-6Al-4V at high and moderate temperatures – Part I: Experimental Results, Mat.
Bhole, Effect of heat treatment on mechanical properties of Ti–6Al–4V ELI alloy, Mat.
Water quenching preceding forging in TMP causes increase of deformed αE grain elongation factors – from fα = 2,1 – without quenching – to 3,6 and 6,8 after α+β↔β and β range quenching respectively (Fig. 2d-e).
Maximum elongation factor fα was achieved for in hot forging after β quenching (fα 6,8).
Picu, Mechanical behavior of Ti-6Al-4V at high and moderate temperatures – Part I: Experimental Results, Mat.
Bhole, Effect of heat treatment on mechanical properties of Ti–6Al–4V ELI alloy, Mat.
Online since: September 2013
Authors: Chun Hua Ma
The excellent mechanical properties of the metal stent to solve the question of vascular elastic recoil after coronary stenting implanted.
They retain the mechanical properties of metal stents , stimulate vascular intimal and damage Vascular intimal.
The suitable mechanical properties, good biocompatibility and degradation behavior make magnesium and magnesium alloy very attractive as a biodegradable implant materials.
They reduce the mechanical force on the vascular wall and inhibite intimal hyperplasia .
The properties, biocompatibility and complications implantated in coronary stent materials.
They retain the mechanical properties of metal stents , stimulate vascular intimal and damage Vascular intimal.
The suitable mechanical properties, good biocompatibility and degradation behavior make magnesium and magnesium alloy very attractive as a biodegradable implant materials.
They reduce the mechanical force on the vascular wall and inhibite intimal hyperplasia .
The properties, biocompatibility and complications implantated in coronary stent materials.
Online since: January 2013
Authors: Aleksandar Subic, Revathi Krishnamoorthy, Derek Scott, Monir Takla
Tolerances otherwise known as noise factors, that might have some influence on the resulting HIC value and deformation of hood panels, have not been considered in this optimisation study for simplicity.
The section, material properties, joints and constraints for the components of the hood assembly were assigned using PRIMER.
The prescribed properties of the impactor such as mass, diameter, angle, position and initial velocity of impact match the ANCAP pedestrian protection testing protocol.
This method generates a cloud of input variables that obey the defined properties for which the output was predicted from the existing response surfaces.
Since the magnitude of peak acceleration, its duration and rebound velocity have substantial influence on the HIC value of pedestrian when colliding with the front of a passenger car, the factors affecting the magnitude of peak acceleration were investigated by creating an ANOVA chart for peak acceleration (Fig. 19).
The section, material properties, joints and constraints for the components of the hood assembly were assigned using PRIMER.
The prescribed properties of the impactor such as mass, diameter, angle, position and initial velocity of impact match the ANCAP pedestrian protection testing protocol.
This method generates a cloud of input variables that obey the defined properties for which the output was predicted from the existing response surfaces.
Since the magnitude of peak acceleration, its duration and rebound velocity have substantial influence on the HIC value of pedestrian when colliding with the front of a passenger car, the factors affecting the magnitude of peak acceleration were investigated by creating an ANOVA chart for peak acceleration (Fig. 19).
Online since: October 2015
Authors: Sajjad Raza Khan, Sattar Emamian, Mokhtar Awang, Adeel Zafar
This importance of polymeric materials at the same time demands an efficient joining technique without compromising their properties.
Joining techniques for polymers include adhesive joining, mechanical fastening, hot plate, ultrasonic, laser, vibration, spin and friction stir welding.
Kiss [9] developed a relationship between a factor “K” and HAZ seam.
Czigány, "Effect of welding parameters on the heat affected zone and the mechanical properties of friction stir welded poly(ethylene-terephthalate-glycol)," Journal of Applied Polymer Science, vol. 125, pp. 2231-2238, 2012
Doniavi, "An experimental study on mechanical properties of friction stir welded ABS sheets," Materials & Design, vol. 43, pp. 402-409, 1// 2013
Joining techniques for polymers include adhesive joining, mechanical fastening, hot plate, ultrasonic, laser, vibration, spin and friction stir welding.
Kiss [9] developed a relationship between a factor “K” and HAZ seam.
Czigány, "Effect of welding parameters on the heat affected zone and the mechanical properties of friction stir welded poly(ethylene-terephthalate-glycol)," Journal of Applied Polymer Science, vol. 125, pp. 2231-2238, 2012
Doniavi, "An experimental study on mechanical properties of friction stir welded ABS sheets," Materials & Design, vol. 43, pp. 402-409, 1// 2013
Online since: May 2014
Authors: Abouzar Moshfegh, Ahmad Jabbarzadeh, Roger I. Tanner
Tanner
School of Aerospace, Mechanical and Mechatronic Eng., The University of Sydney, NSW 2006, Australia
Since then, valuable attempts were contributed into this model to patch its defects in meeting statistical mechanics principles and matching realistic fluid properties [2-4].
Convergence of system total energy to a definite value with least standard deviation (STDEV) plus having a close temperature to target value are the two key factors assuring that simulation results are correct.
For rheological properties, we are interested in shear rate values with proper and smoother temperature control.
Ernst, Static and dynamic properties of dissipative particle dynamics.
Since then, valuable attempts were contributed into this model to patch its defects in meeting statistical mechanics principles and matching realistic fluid properties [2-4].
Convergence of system total energy to a definite value with least standard deviation (STDEV) plus having a close temperature to target value are the two key factors assuring that simulation results are correct.
For rheological properties, we are interested in shear rate values with proper and smoother temperature control.
Ernst, Static and dynamic properties of dissipative particle dynamics.
Online since: June 2008
Authors: Amauri Garcia, Noé Cheung, Kleber A.S. Cruz, Noman H. Khan
With the inherent rapid heating and cooling rates to which this surface layer is
subjected, this process provides an opportunity to produce different microstructures from that of the
bulk metal leading to useful properties.
Laser surface melting allows selective heating and melting of the surface, which modifies the surface properties of the material due to rapid melting followed by rapid solidification.
The high cooling rates at which this surface layer is subjected results in the formation of different microstructures from the bulk metal, leading to improved properties such as better resistance to wear and corrosion [2-4].
The dendrites continued to grow upwards up to a point where a strong change of orientation affects significantly the dendritic structure.
Mechanical Vickers hardness tests carried out along the treated cross sections have shown an increase of about 90% on hardness if compared to that of the original substrate, confirming the effectiveness of the laser treatment in the improvement of surface mechanical properties.
Laser surface melting allows selective heating and melting of the surface, which modifies the surface properties of the material due to rapid melting followed by rapid solidification.
The high cooling rates at which this surface layer is subjected results in the formation of different microstructures from the bulk metal, leading to improved properties such as better resistance to wear and corrosion [2-4].
The dendrites continued to grow upwards up to a point where a strong change of orientation affects significantly the dendritic structure.
Mechanical Vickers hardness tests carried out along the treated cross sections have shown an increase of about 90% on hardness if compared to that of the original substrate, confirming the effectiveness of the laser treatment in the improvement of surface mechanical properties.