Sort by:
Publication Type:
Open access:
Publication Date:
Periodicals:
Search results
Online since: September 2014
Authors: Roman Dumitrescu, Jürgen Gausemeier, Thomas Schierbaum
A central challenge in this field is the economic efficiency analysis which was identified as a main key factor for successful MID-Projects.
There are manifold mechanical and electrical functions which can be realized furthermore; optical, fluidal and thermal functions can also be integrated in one part.
Already during the system design relevant properties of the developing system are defined.
This is in particular necessary for complex products, whose concept is affected by the considered manufacturing technology, e.g. mechatronic integrated devices.
They are based on the technology property cards by Peitz [8].
There are manifold mechanical and electrical functions which can be realized furthermore; optical, fluidal and thermal functions can also be integrated in one part.
Already during the system design relevant properties of the developing system are defined.
This is in particular necessary for complex products, whose concept is affected by the considered manufacturing technology, e.g. mechatronic integrated devices.
They are based on the technology property cards by Peitz [8].
Online since: September 2006
Authors: Henri Walaszek, J. Hoblos, G. Bourse, C. Robin, H. Qozam, Patrick Bouteille, M. Cherfaoui
Welding, which is a largely used process in the mechanical manufacturing, well
known to induce high-level residual stresses.
The level of residual stresses is of great importance for the lifetime of welded components used in mechanical engineering industry.
The residual stress states in welded parts result of variety of parameters like material properties, geometry of the joints and the welding process.
They range from destructive methods like the hole-drilling method to a large number of non-destructive methods based on X-ray or neutron diffraction, photo-elasticity, or the determination of magnetic properties and ultrasonic measurements.
In the present paper, we performed complete calibration measurements on parts extracted from PM and MZ to improve the microstructure correction factor.
The level of residual stresses is of great importance for the lifetime of welded components used in mechanical engineering industry.
The residual stress states in welded parts result of variety of parameters like material properties, geometry of the joints and the welding process.
They range from destructive methods like the hole-drilling method to a large number of non-destructive methods based on X-ray or neutron diffraction, photo-elasticity, or the determination of magnetic properties and ultrasonic measurements.
In the present paper, we performed complete calibration measurements on parts extracted from PM and MZ to improve the microstructure correction factor.
Online since: August 2012
Authors: Stanisław Roskosz, Bartłomiej Dybowski, Robert Jarosz
Microporosity created during solidification affects strongly mechanical properties of AZ91 alloy.
The speed of heat removal inside the mould affects the refinement of the grain – higher speed of the heat removal makes the grain smaller. 5.
Mizera, Microstructural stability and creep properties of die casting Mg-4Al-4RE magnesium alloy, Materials Characterization 60 (2009) 1107-1113
Khomamizadeh, The effect of different content of Al, RE and Si element on the microstructure, mechanical and creep properties of Mg–Al alloys, Materials Science and Engineering A 523 (2009) 1-6 [7] A.
Shin, Effect of microporosity on the tensile properties of AZ91 magnesium alloy, Acta Materialia 55 (2007) 4293-4303 [9] H.
The speed of heat removal inside the mould affects the refinement of the grain – higher speed of the heat removal makes the grain smaller. 5.
Mizera, Microstructural stability and creep properties of die casting Mg-4Al-4RE magnesium alloy, Materials Characterization 60 (2009) 1107-1113
Khomamizadeh, The effect of different content of Al, RE and Si element on the microstructure, mechanical and creep properties of Mg–Al alloys, Materials Science and Engineering A 523 (2009) 1-6 [7] A.
Shin, Effect of microporosity on the tensile properties of AZ91 magnesium alloy, Acta Materialia 55 (2007) 4293-4303 [9] H.
Online since: April 2014
Authors: Pei Lu, Meng Jiao, Bao Gang Hou
The fluctuation of effective constituent extraction efficiency reflects the level of control in the production process which directly affects the quality of the products' stability, uniformity and the stability of preparation technology formula, this fluctuation is of important significance in maintaining consistency of TCM products’ properties [1].
Based on the alcohol extraction process of a kind of TCM injection, a relational model between the alcohol extraction process parameters and the quality factors of intermediates has been established in this paper.
Process parameters such as the ratio of solvent, insulating value, tank pressure, heating rate and holding time affect the fluctuations of extraction efficiency in different extent.
Extraction efficiency is the quality factor which is mainly focused.
Mechanical and electronic information. 2011, 29(311):1-5
Based on the alcohol extraction process of a kind of TCM injection, a relational model between the alcohol extraction process parameters and the quality factors of intermediates has been established in this paper.
Process parameters such as the ratio of solvent, insulating value, tank pressure, heating rate and holding time affect the fluctuations of extraction efficiency in different extent.
Extraction efficiency is the quality factor which is mainly focused.
Mechanical and electronic information. 2011, 29(311):1-5
Online since: June 2009
Authors: Yang Gao, Xiao Peng Wang, Tian Ning Chen
Influencing factors
about the cumulative amount of release drug were analyzed.
Experimental study on PLGA material properties PLGA is the copolymer of polylactic acid (PLA) and polyglycolic acid (PGA).
The performance of PLGA is greatly affected by the monomer ratio of the two components.
The experimental results suggest that degradation rate is mainly influenced by two factors: monomer ratio and intrinsic viscosity.
Influencing Factors of the Drug Release Effect 3.1 The Influence of Micro-Porous Diameter to the Release Result Fig. 4 shows the influence of micro-porous diameter to the release effect.
Experimental study on PLGA material properties PLGA is the copolymer of polylactic acid (PLA) and polyglycolic acid (PGA).
The performance of PLGA is greatly affected by the monomer ratio of the two components.
The experimental results suggest that degradation rate is mainly influenced by two factors: monomer ratio and intrinsic viscosity.
Influencing Factors of the Drug Release Effect 3.1 The Influence of Micro-Porous Diameter to the Release Result Fig. 4 shows the influence of micro-porous diameter to the release effect.
Online since: May 2011
Authors: Xiao Yong Li, Kang Xu, Si Yuan Wang
If large deformation of roadbed occurs, it would result in cracks in road surface, and the normal use and safety of road would be affected.
Padding Physical Property.
Characterizing the mechanical properties of in situ residual soil.
Confining stress dependency of mechanical properties of sands.
Variation in bearing capacity factors of dense sand assessed by model loading tests.
Padding Physical Property.
Characterizing the mechanical properties of in situ residual soil.
Confining stress dependency of mechanical properties of sands.
Variation in bearing capacity factors of dense sand assessed by model loading tests.
Online since: August 2007
Authors: Yool Kwon Oh, Ho Dong Yang, Yong Bum Kim
Numerical Simulation on Thermal Strain Characteristics of
Casting Mold for Automobile Tire
Yong Bum Kim
1,a, Ho Dong Yang1,b and
Yool Kwon Oh
2,c
1
Department of Precision Mechanical Engineering, Chosun University, South Korea.
2
Department of Mechatronics Engineering, Chosun University, South Korea.
Moreover, the introduced technique of numerical simulation applying a FEM is very useful and important things in the mechanical behavior of materials, especially needs the accuracy improvement such as aluminum alloy casting mold products.
Value of temperature at each point [K] Time Temperature Point Time Temperature Point 720 � 592 � 670 � 617 � 300sec 677 � 600sec 600 � 556 � 528 � 572 � 541 � 900sec 559 � 1200sec 530 � From the results of calculated temperature distributions, the surface of aluminum alloy mold could be happened deformation and tire mold could be affected the precision when temperature difference occurred rapidly during the cooling process.
Also, the principle factor of stress development could be rapidly fallen the temperature variation.
Cheon: The Effect of the Metallic Mold Cooling System on the Solidification Structures and the Mechanical Properties for Al alloy Castings, Dong-A University, Korea (1994)
Moreover, the introduced technique of numerical simulation applying a FEM is very useful and important things in the mechanical behavior of materials, especially needs the accuracy improvement such as aluminum alloy casting mold products.
Value of temperature at each point [K] Time Temperature Point Time Temperature Point 720 � 592 � 670 � 617 � 300sec 677 � 600sec 600 � 556 � 528 � 572 � 541 � 900sec 559 � 1200sec 530 � From the results of calculated temperature distributions, the surface of aluminum alloy mold could be happened deformation and tire mold could be affected the precision when temperature difference occurred rapidly during the cooling process.
Also, the principle factor of stress development could be rapidly fallen the temperature variation.
Cheon: The Effect of the Metallic Mold Cooling System on the Solidification Structures and the Mechanical Properties for Al alloy Castings, Dong-A University, Korea (1994)
Online since: August 2017
Authors: Vladimir Luzin, ANdrew Vackel, Alfredo Valarezo, Sanjay Sampath
A great variety of techniques are nowadays used to spray coatings with different functionality and properties for the purpose of surface enhancement.
Introduction A wide class of material science problems and engineering applications rely on enhancing surface properties of various engineering components.
Another way of enhancing the surface properties is achieved through applying thermo-mechanical surface treatments such as shot peening, laser shock peening, water-jet peening, cavitation peening, deep rolling, ultrasound impact treatment, low plasticity burnishing and grit blasting.
For samples with lateral dimension much bigger then overall thickness, taken to be a factor of 10 or larger, edge effects do not affect the uniform-in-plane stress state in the central part of the samples and the plane stress condition is fulfilled with greater accuracy.
Stress Measurements in 0.25 mm Thick WC Coatings WC-Co metal matrix composite coatings are widely used in industrial applications requiring superior mechanical properties, low friction coefficient, high wear resistance, toughness and chemical stability within a range of temperatures.
Introduction A wide class of material science problems and engineering applications rely on enhancing surface properties of various engineering components.
Another way of enhancing the surface properties is achieved through applying thermo-mechanical surface treatments such as shot peening, laser shock peening, water-jet peening, cavitation peening, deep rolling, ultrasound impact treatment, low plasticity burnishing and grit blasting.
For samples with lateral dimension much bigger then overall thickness, taken to be a factor of 10 or larger, edge effects do not affect the uniform-in-plane stress state in the central part of the samples and the plane stress condition is fulfilled with greater accuracy.
Stress Measurements in 0.25 mm Thick WC Coatings WC-Co metal matrix composite coatings are widely used in industrial applications requiring superior mechanical properties, low friction coefficient, high wear resistance, toughness and chemical stability within a range of temperatures.
Online since: December 2012
Authors: Ji Wei Wen, Chen Chen, Fang Qian
But as the coal bed methane is attached to the coal seam and different from the conventional hydrocarbon reservoir in the physical and mechanical properties and in the storage, it determines the particularity of the drilling techniques.
On occasions that position drift is affected seriously by the formation factors, we can use cascade two stabilizers on the bit to stable position and deviation to a great extent.
Solid particles like cuttings and barite make the fluid flow properties go bad resulting into not only breaking the fluid property stability, but also increasing the friction of the circulation system which make the equipments wear prematurely.
On occasions that position drift is affected seriously by the formation factors, we can use cascade two stabilizers on the bit to stable position and deviation to a great extent.
Solid particles like cuttings and barite make the fluid flow properties go bad resulting into not only breaking the fluid property stability, but also increasing the friction of the circulation system which make the equipments wear prematurely.
Online since: March 2012
Authors: Yan Ping Shi, Shu Hua Fan
Application of Magnetoelastic Effect of Ferromagnetic Material in
Stress Measurement
Yanping Shi, Shuhua Fan
Dept. of Mechanical Engineering Huaihai Institute of Technology
Lianyungang, Jiangsu Province, China
Shiyp58@163.com
Keywords: ferromagnetic material; sensor; magnetoelastic effect; stresses measurement
Abstract.
The output characteristic of the sensor affected by field current intensity, frequency, and the gap between the probe of the sensor and the surface of the material tested was analyzed by testing.
The principle of sensor magnetoelastic effect is refers, the change of magnetism characteristic of the ferromagnetic material, when it under the mechanical stress function.
If we use a special sensor to measure the magnetic properties (permeability) changes, we can determine the change of the stress in the ferromagnetic material and the load acted on it [1].
The gap between sensor and the test sample is 0.1mm, the exciting current 50mA, the frequency 5 kHz, the test system enlargement factor 1000.
The output characteristic of the sensor affected by field current intensity, frequency, and the gap between the probe of the sensor and the surface of the material tested was analyzed by testing.
The principle of sensor magnetoelastic effect is refers, the change of magnetism characteristic of the ferromagnetic material, when it under the mechanical stress function.
If we use a special sensor to measure the magnetic properties (permeability) changes, we can determine the change of the stress in the ferromagnetic material and the load acted on it [1].
The gap between sensor and the test sample is 0.1mm, the exciting current 50mA, the frequency 5 kHz, the test system enlargement factor 1000.