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Online since: May 2020
Authors: Wei Yu, Yun Fei Cao, Huan Yang, Zeng Qiang Man, Wen Gao Chang
In general, mechanical properties are mainly affected by the microstructure in the process of thermal deformation.
Those medium phases additionally give control of austenite grain growth and recrystallization process, correspondingly, influencing the mechanical properties.
The static recrystallization process is mainly affected by factors such as temperature, strain rate and deformation [9, 10].
Köthe, Influence of microalloying on the mechanical properties of medium carbon forging steels after a newly designed post forging treatment, J.
Liu, Mechanical properties and microstructural characterization of medium carbon non-quenched and tempered steel: Microalloying behavior, J.
Those medium phases additionally give control of austenite grain growth and recrystallization process, correspondingly, influencing the mechanical properties.
The static recrystallization process is mainly affected by factors such as temperature, strain rate and deformation [9, 10].
Köthe, Influence of microalloying on the mechanical properties of medium carbon forging steels after a newly designed post forging treatment, J.
Liu, Mechanical properties and microstructural characterization of medium carbon non-quenched and tempered steel: Microalloying behavior, J.
Online since: April 2015
Authors: Hussin Kamarudin, Mohd Mustafa Al Bakri Abdullah, Mohammed Binhussain, Sharifah Zaliha Syed Zuber, Fauziah Ahmad
It was difficult to isolate the effect due to the individual factors because the factors which affect the plasticity of soils for the most part act simultaneously[5].
The methodof adding admixtures to the high liquid limit soil could improve the physical and mechanical properties due to the chemical reactions between the soil and the admixtures that lead to the decrease of plasticity index, expansion and shrinkage potentials and also the increase of water stability and compressive strength [7].
Plastic limits of Soil 3 Conclusion From the results obtained the following can be concluded: (i) The geopolymerization process had influenced the values of liquid and plastic limits of those soils (ii) There is high potential the physical and mechanical properties of those soils could be improved by this process References [1] R.
West:Some Factors Affecting The Relation Between The Clay Minerals In Soils And Their Plasticity, Clay Minerals (1966) 6, 179
Chaudhary: Mechanism of geopolymerization and factors influencing its development: a review, J Mater Sci (2007) 42, pp. 729-746
The methodof adding admixtures to the high liquid limit soil could improve the physical and mechanical properties due to the chemical reactions between the soil and the admixtures that lead to the decrease of plasticity index, expansion and shrinkage potentials and also the increase of water stability and compressive strength [7].
Plastic limits of Soil 3 Conclusion From the results obtained the following can be concluded: (i) The geopolymerization process had influenced the values of liquid and plastic limits of those soils (ii) There is high potential the physical and mechanical properties of those soils could be improved by this process References [1] R.
West:Some Factors Affecting The Relation Between The Clay Minerals In Soils And Their Plasticity, Clay Minerals (1966) 6, 179
Chaudhary: Mechanism of geopolymerization and factors influencing its development: a review, J Mater Sci (2007) 42, pp. 729-746
Micro Mechanical Behaviors and Damage in Nickel Base Alloy and Steels during Very High Cycle Fatigue
Online since: December 2016
Authors: Guo Cai Chai
The crystallographic properties, Schmid factors and orientations of grain and boundaries have very important roles to the fatigue damage.
Table 1 shows their nominal chemical compositions and mechanical properties.
Results and discussion Fatigue properties and fatigue crack initiation.
Schmid factors.
The influence of grain or twin boundary on fatigue damage strongly depends on the crystallographic properties and Schmid factor of grain and its orientations.
Table 1 shows their nominal chemical compositions and mechanical properties.
Results and discussion Fatigue properties and fatigue crack initiation.
Schmid factors.
The influence of grain or twin boundary on fatigue damage strongly depends on the crystallographic properties and Schmid factor of grain and its orientations.
Online since: August 2016
Authors: Agnieszka Kułakowska, Radoslaw Patyk, Łukasz Bohdal
It has been found that inadequate properties WW are the cause of the frictional resistance increase of 50%.
Thus, the surface layer has a very significant role in modern technology, substantially affecting the durability and reliability of the equipment and the energy lost to overcome the friction while the material consumption and production costs.
One method of processing a very accurate for providing a surface layer with favorable performance properties, surface treating plastic - burnishing.
In the first step, on the semi-finished product surface the regular asperities of the required outline (triangular, arc, arc-line, or other) and parameters dependent on the desired surface layer properties is embossed.
Patyk, Problems Determining of the Mechanical Properties of Metallic Materials from the Tensile Test in the Aspect of Numerical Calculations of the Technological Processes, Applied Mechanics and Materials 474 (2014) 454-459
Thus, the surface layer has a very significant role in modern technology, substantially affecting the durability and reliability of the equipment and the energy lost to overcome the friction while the material consumption and production costs.
One method of processing a very accurate for providing a surface layer with favorable performance properties, surface treating plastic - burnishing.
In the first step, on the semi-finished product surface the regular asperities of the required outline (triangular, arc, arc-line, or other) and parameters dependent on the desired surface layer properties is embossed.
Patyk, Problems Determining of the Mechanical Properties of Metallic Materials from the Tensile Test in the Aspect of Numerical Calculations of the Technological Processes, Applied Mechanics and Materials 474 (2014) 454-459
Online since: November 2015
Authors: Gheorghe Brabie, Bogdan Chirita
The material used was 1050 aluminium alloy whose mechanical properties are presented in Table 2.
Geometric parameters of cylindrical parts and used tools Blank diameter (Db) Punch/die edge radius (rp/d) Drawing depth (d) Punch diameter (Dp) Clearances (c) (mm) 3.60; 3.70; 3.80 4.20; 6.70; 9.00 0.10; 0.25; 0.50 1.50;2.00; 2.50 2.00;4.00; 6.00 1.00t; 1.05t;1.10t; 1.15t;1.20t; 1.25t Table 2 Mechanical properties of metal sheets Young Modulus Yield stress Poisson ratio Anisotropy coefficient Hardening coefficient Total elongation Ultimate tensile stress [MPa] [MPa] - - - [%] [MPa] 58000 98.957 0.30 0.752 0.285 33.00 63.725 The simulation was performed by using the DynaForm software - version 5.7.1 and the Barlat 89 criterion of plasticity.
Experimental device Wrinkling Analysis The wrinkling analysis of the mini drawn parts was performed by simulation and experiment and considering different factors of influence like: part diameter, sheet thickness, punch edge radius, tool clearance.
One of main factors that lead to wrinkling occurrence and influence the wrinkles amplitude is the variation of sheet thickness on the drawn part wall.
In order to reduce the undesired effect of part wall wrinkling it is needed to control the variation of the following factors and parameters: sheet thickness variation that must be minimized, blankholder force that must be increased till a certain value, tool geometry that must have optimum clearances and punch edge radius.
Geometric parameters of cylindrical parts and used tools Blank diameter (Db) Punch/die edge radius (rp/d) Drawing depth (d) Punch diameter (Dp) Clearances (c) (mm) 3.60; 3.70; 3.80 4.20; 6.70; 9.00 0.10; 0.25; 0.50 1.50;2.00; 2.50 2.00;4.00; 6.00 1.00t; 1.05t;1.10t; 1.15t;1.20t; 1.25t Table 2 Mechanical properties of metal sheets Young Modulus Yield stress Poisson ratio Anisotropy coefficient Hardening coefficient Total elongation Ultimate tensile stress [MPa] [MPa] - - - [%] [MPa] 58000 98.957 0.30 0.752 0.285 33.00 63.725 The simulation was performed by using the DynaForm software - version 5.7.1 and the Barlat 89 criterion of plasticity.
Experimental device Wrinkling Analysis The wrinkling analysis of the mini drawn parts was performed by simulation and experiment and considering different factors of influence like: part diameter, sheet thickness, punch edge radius, tool clearance.
One of main factors that lead to wrinkling occurrence and influence the wrinkles amplitude is the variation of sheet thickness on the drawn part wall.
In order to reduce the undesired effect of part wall wrinkling it is needed to control the variation of the following factors and parameters: sheet thickness variation that must be minimized, blankholder force that must be increased till a certain value, tool geometry that must have optimum clearances and punch edge radius.
Online since: April 2009
Authors: Li Fu, Jie Ren, Zhong Ming Nie
Materials
used for the microelectronic devices usually needed the special jointing methods to get special
microstructure and physical properties.
During the microelectronic device manufacture, not only the bonding strength between the down-lead and the contact electrode but also the physical properties of devices should be taken into account.
Until now, there were fewer reports about the ultrasonic welding technology of the CZT electrode because many factors would affected the connect strength and electrical properties of the junction interface between the CZT wafer and its electrode.
The pulling test was taken in order to estimate the mechanical properties of the welded points.
The surface treatment of samples was the mechanical polishing.
During the microelectronic device manufacture, not only the bonding strength between the down-lead and the contact electrode but also the physical properties of devices should be taken into account.
Until now, there were fewer reports about the ultrasonic welding technology of the CZT electrode because many factors would affected the connect strength and electrical properties of the junction interface between the CZT wafer and its electrode.
The pulling test was taken in order to estimate the mechanical properties of the welded points.
The surface treatment of samples was the mechanical polishing.
Online since: December 2016
Authors: Dariusz Rozumek, Henryk Paul, M. Prażmowski
It allows obtaining a bimetal of a permanent and continuous connection, characterized by good mechanical properties, however, it results in significant changes in the structure of the coupled materials, both in the interface area and in the overlay material [1].
The chemical composition and the mechanical properties was shown in [3,5].
Mechanical properties and the 'quality of the bond'.
Ultrasonic test enabled to examine the continuity of the weld whereas the assessment of mechanical and technological properties was based on shearing, peeling, tensile tests and lateral bending.
Conditions for testing the static mechanical properties are shown in [5].
The chemical composition and the mechanical properties was shown in [3,5].
Mechanical properties and the 'quality of the bond'.
Ultrasonic test enabled to examine the continuity of the weld whereas the assessment of mechanical and technological properties was based on shearing, peeling, tensile tests and lateral bending.
Conditions for testing the static mechanical properties are shown in [5].
Online since: January 2014
Authors: Chuan Ming Zhai, Jun Tan, Qing Song Ling, Shang Guo Li
The force influence factors of the deck continuous section were studied by changing parameters, and the corresponding improvement measures were put forward.
Introduction The simply supported girder bridges with continuous deck have a wildly used for both the mechanical properties of simply supported girder bridge and provide a continuous lane for vehicles to ensure a smooth and comfortable driving and play the superiority of continuous beam bridge.
The model beams were simulated with ANSYS to analyze the stress distribution and its influence factors of the structural paving layer under different load conditions, and analyzed the main reason for damage.
The ANSYS finite element models are shown in Fig.2-Fig.3, and the material properties are shown in Table 1.
Table 1 Material properties for modeling Material type Tensile strength(N/mm2) Density(kg/m3) Poisson ratio Thermal expansion coefficient Modulus(N/mm2) C40 Concrete 1.71 2600 0.1667 1×10-5/℃ 3.25×104 Steel 360 7800 0.3 1.2×10-5/℃ 2.0×105 Fig.2 Finite element model axis view of simply-supported beam with continuous deck Fig.3 Bridge deck continuous joint fine grid partition schematic diagram Simulation analysis under all load conditions and influence factors The linear and nonlinear analysis are conducted under all load conditions and influence factors, including automobile live load, global temperature decrease and rise 20℃, and their composite condition.
Introduction The simply supported girder bridges with continuous deck have a wildly used for both the mechanical properties of simply supported girder bridge and provide a continuous lane for vehicles to ensure a smooth and comfortable driving and play the superiority of continuous beam bridge.
The model beams were simulated with ANSYS to analyze the stress distribution and its influence factors of the structural paving layer under different load conditions, and analyzed the main reason for damage.
The ANSYS finite element models are shown in Fig.2-Fig.3, and the material properties are shown in Table 1.
Table 1 Material properties for modeling Material type Tensile strength(N/mm2) Density(kg/m3) Poisson ratio Thermal expansion coefficient Modulus(N/mm2) C40 Concrete 1.71 2600 0.1667 1×10-5/℃ 3.25×104 Steel 360 7800 0.3 1.2×10-5/℃ 2.0×105 Fig.2 Finite element model axis view of simply-supported beam with continuous deck Fig.3 Bridge deck continuous joint fine grid partition schematic diagram Simulation analysis under all load conditions and influence factors The linear and nonlinear analysis are conducted under all load conditions and influence factors, including automobile live load, global temperature decrease and rise 20℃, and their composite condition.
Online since: January 2013
Authors: Jing Jing Lu, Xiao Lan Liu, Zhi Sheng Liu, Xi Qun Zheng
The functional proteins was the key factors to determined it’s utilization value, it not only affects the sensory properties of food will also affect the processing, transport and physical properties during storage .
Functional properties of proteins not only for the source of protein, but also to a variety of processing conditions and external environmental factors, such as pH , temperature and ionic strength, etc。
The systematic study on the functional properties of CSWPC has yet to see the related reports.
Figure 2 shows the oil absorption of CSWPC is better than SPI during the temperature range, may be related to the combination ability of lipophilic group on the protein surface and the hydroxyl of lipid, but also for the molecular structure factors.
[10] Liu Wei, Study on Functional Properties of Native Water-hyacinth Leaf Protein[D], Southwest University, 2007.
Functional properties of proteins not only for the source of protein, but also to a variety of processing conditions and external environmental factors, such as pH , temperature and ionic strength, etc。
The systematic study on the functional properties of CSWPC has yet to see the related reports.
Figure 2 shows the oil absorption of CSWPC is better than SPI during the temperature range, may be related to the combination ability of lipophilic group on the protein surface and the hydroxyl of lipid, but also for the molecular structure factors.
[10] Liu Wei, Study on Functional Properties of Native Water-hyacinth Leaf Protein[D], Southwest University, 2007.
Online since: June 2019
Authors: Khalil Ibrahim Abass
The material formability is affected by mechanical properties and characteristics of the product profile.
In addition, the important factors that lead to failure of the completed products have been studied and debated. 2D Simulation Models The simulation models take into account the material property, elastic-plastic of the blank behavior and the crossing points contact effect of the forming tool, the grip tool and the blank.
Aluminum alloy_1050 was used, where the mechanical properties that resulted from the tensile test are represented in Table 1.
It is important to predict the results with the factors to reduce the wide number of tests and applying the time-cost criteria.
Carsley, Forming of AA5182-O and AA5754-O at elevated temperatures using coupled thermo-mechanical finite element models, Int.
In addition, the important factors that lead to failure of the completed products have been studied and debated. 2D Simulation Models The simulation models take into account the material property, elastic-plastic of the blank behavior and the crossing points contact effect of the forming tool, the grip tool and the blank.
Aluminum alloy_1050 was used, where the mechanical properties that resulted from the tensile test are represented in Table 1.
It is important to predict the results with the factors to reduce the wide number of tests and applying the time-cost criteria.
Carsley, Forming of AA5182-O and AA5754-O at elevated temperatures using coupled thermo-mechanical finite element models, Int.