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Online since: June 2015
Authors: Ionel Chicinaş, Dorel Banabic, Florin Popa
The bending performances can be affected negatively by intermetallic particles naturally presented in such alloys.
Other factor is the influence of the microstructure on the mechanical properties of this alloy and on his resistance during service as the final auto part.
The samples where cut to these angles in order to correlate the anisotropic properties of the cold rolled samples with the crystallographic texture [15].
Pogatscher Property criteria for automotive Al-Mg-Si sheet alloys, Mater. 7 (2014) 5047-5068 [4] J.
Brunet, Ductile damage in aluminium alloy thin sheets: Correlation between micro-tomography observations and mechanical modeling, Mater.
Other factor is the influence of the microstructure on the mechanical properties of this alloy and on his resistance during service as the final auto part.
The samples where cut to these angles in order to correlate the anisotropic properties of the cold rolled samples with the crystallographic texture [15].
Pogatscher Property criteria for automotive Al-Mg-Si sheet alloys, Mater. 7 (2014) 5047-5068 [4] J.
Brunet, Ductile damage in aluminium alloy thin sheets: Correlation between micro-tomography observations and mechanical modeling, Mater.
Online since: October 2009
Authors: Hua Yan, Xiao Wang, Dong Lei Liu, Zong Bao Shen, Xin Hua Song
The mechanical
parameters of the materials were shown in Table 1.
The penalty contact method was selected for mechanical constraint formulation.
The contact property is a tangential.
Fig.1 The CAD and mesh model of prosthesis and surrounding osseous tissues The CAD models were imported into finite element software and the properties of the materials were defined accordance with Table 1.
All the distortion enlargement factor were 100.
The penalty contact method was selected for mechanical constraint formulation.
The contact property is a tangential.
Fig.1 The CAD and mesh model of prosthesis and surrounding osseous tissues The CAD models were imported into finite element software and the properties of the materials were defined accordance with Table 1.
All the distortion enlargement factor were 100.
Online since: December 2012
Authors: Hee Shin Kang, Jeong Suh, Sung Jo Kwak
The quality testing of the laser welding was conducted by observing the shape of the beads on the plate and the cross-section of the welded parts, analyzing the results of mechanical tensile test.
However, it is difficult to exactly weld a desired pattern on the fly, because unexpected factors such as time-delay, beam deflection, or low accuracy affect for welding.
Although all welding parameters is set appropriately, unexpected factor such as time delay causes bad quality as well as the geometric error of a welded pattern.
Then we can obtain the same properties of welded patterns regardless of robot motion.
However, it is difficult to exactly weld a desired pattern on the fly, because unexpected factors such as time-delay, beam deflection, or low accuracy affect for welding.
Although all welding parameters is set appropriately, unexpected factor such as time delay causes bad quality as well as the geometric error of a welded pattern.
Then we can obtain the same properties of welded patterns regardless of robot motion.
Online since: March 2011
Authors: Yang Qi, Babar Shahzad
Introduction
Since many decades Zinc Oxide has been an attractive and vital material for research due to its unique properties and diverse applications.
A lot of efforts have been made to study the various parameters that affect the microstructure and properties of thin films grown by sol-gel process.
Fig.1. pH of precursor solution as function of solution aging time Sol-Aging effect on structural properties of ZnO thin films.
Sol-Aging effect on Morphological properties of ZnO thin films.
Joon Kwon et al. suggest that the difference in thermal expansion coefficients between the film and substrate and/or volume reduction upon crystallization are the major factors for the wrinkling of thin films [30, 31].
A lot of efforts have been made to study the various parameters that affect the microstructure and properties of thin films grown by sol-gel process.
Fig.1. pH of precursor solution as function of solution aging time Sol-Aging effect on structural properties of ZnO thin films.
Sol-Aging effect on Morphological properties of ZnO thin films.
Joon Kwon et al. suggest that the difference in thermal expansion coefficients between the film and substrate and/or volume reduction upon crystallization are the major factors for the wrinkling of thin films [30, 31].
Online since: July 2017
Authors: Pavel S. Volegov, Roman M. Gerasimov
It also allows predicting and identifying different properties of solids, improving production process and perfecting the quality of metals.
The correct description of physical and mechanical properties requires knowledge about internal structure of material, which at the lowest level is determined by atomic configurations.
The defect structure is understood as different types of point and surface defects and dislocations, and their atomic structure and properties are studied well enough.
However, grain boundaries are also part of defect structure, but their structure and properties remain underinvestigated.
To understand how relative positions of atoms at the grain boundaries affect the physical properties of polycrystalline materials and to learn how to manage these properties, we must know the structure of the boundaries, as well as their basic restructuring mechanisms [1].
The correct description of physical and mechanical properties requires knowledge about internal structure of material, which at the lowest level is determined by atomic configurations.
The defect structure is understood as different types of point and surface defects and dislocations, and their atomic structure and properties are studied well enough.
However, grain boundaries are also part of defect structure, but their structure and properties remain underinvestigated.
To understand how relative positions of atoms at the grain boundaries affect the physical properties of polycrystalline materials and to learn how to manage these properties, we must know the structure of the boundaries, as well as their basic restructuring mechanisms [1].
Online since: January 2010
Authors: Hiroki Ota, Tomohiro Ishii, Takashi Samukawa, Takumi Ujiro, Hideaki Yamashita
Mechanical Properties.
Mechanical properties of the developed steel are similar to Type430J1L as shown in Table 2.
Ridging and Other Properties.
Table 2 Mechanical properties of the developed steel.
Table 3 Physical properties of the developed steel.
Mechanical properties of the developed steel are similar to Type430J1L as shown in Table 2.
Ridging and Other Properties.
Table 2 Mechanical properties of the developed steel.
Table 3 Physical properties of the developed steel.
Online since: February 2009
Authors: Juan Su, Hou Jiang Zhang, Zhi Ren Guo
Drill resistance is relative to several properties the object materials, such as hardness and
strength.
The drilling resistance is affected by several properties of the material, such as density, hardness, strength.
For the wood, the density is the most influencing factor on the drilling resistance and mostly decides wood hardness and strength. i.e. there is a strong relationship between the wood density and the micro-drilling resistance.
Knots are one of the most common defects, which affect mechanical properties of a wood member very much due to the interruption of continuity and change in the direction of wood fibers.
Table 1 Average drill resistances and densities of larch and Scotch pine Larch Scotch pine Property Mean Standard deviation Min.
The drilling resistance is affected by several properties of the material, such as density, hardness, strength.
For the wood, the density is the most influencing factor on the drilling resistance and mostly decides wood hardness and strength. i.e. there is a strong relationship between the wood density and the micro-drilling resistance.
Knots are one of the most common defects, which affect mechanical properties of a wood member very much due to the interruption of continuity and change in the direction of wood fibers.
Table 1 Average drill resistances and densities of larch and Scotch pine Larch Scotch pine Property Mean Standard deviation Min.
Online since: April 2016
Authors: Michal Holubčík, Radovan Nosek, Peter Vician, Jozef Jandacka
The various types and forms of biomass have their specific properties and chemical composition as has been confirmed by combustion of different types of briquettes in this work.
To help to put these emissions into context Table 5 shows some approximate emission factors for other fuels.
These were derived from the UK National Atmospheric Emission Inventory emission factors and making some assumptions about the efficiency of plant for each fuel.
Fuel Emission factor [g.GJ-1] Coal 120 Fuel oil 12 Gas oil 5 Natural gas 1 Based on the emission factors for biomass derived for the study, particulate emissions from biomass are typically lower than small coal fired plant but higher than oil and gas.
These particles significantly affect the final result of the measurement.
To help to put these emissions into context Table 5 shows some approximate emission factors for other fuels.
These were derived from the UK National Atmospheric Emission Inventory emission factors and making some assumptions about the efficiency of plant for each fuel.
Fuel Emission factor [g.GJ-1] Coal 120 Fuel oil 12 Gas oil 5 Natural gas 1 Based on the emission factors for biomass derived for the study, particulate emissions from biomass are typically lower than small coal fired plant but higher than oil and gas.
These particles significantly affect the final result of the measurement.
Online since: September 2011
Authors: Qing Xiu Jia, Chao Ming Shi, Guo Liang Zhao
Some of the solution properties, i.e., surface tension, and conductivity, were measured.
It was suggested that, the solution properties have a more dominant effect on the morphology and sizes of the electrospun fibers obtained [1-4].
Furthermore, solvent is one of the main contributors to polymer solution properties in addition to the contributor of intrinsic properties of polymer.
Polyamide (PA) plastics are mainly used as engineering materials due to their good mechanical properties, such as high tensile and impact strength, and abrasion resistance.
It is found that the solution properties affect the electrospinnability of PA6 and the appearance and size of the electrospun fibers.
It was suggested that, the solution properties have a more dominant effect on the morphology and sizes of the electrospun fibers obtained [1-4].
Furthermore, solvent is one of the main contributors to polymer solution properties in addition to the contributor of intrinsic properties of polymer.
Polyamide (PA) plastics are mainly used as engineering materials due to their good mechanical properties, such as high tensile and impact strength, and abrasion resistance.
It is found that the solution properties affect the electrospinnability of PA6 and the appearance and size of the electrospun fibers.
Online since: May 2012
Authors: Yan Lei Wang, Jin Ping Ou, Yun Yu Li
The stiffness is the critical factor in FRP structure design.
Dimensions of GFRP box beam and material properties The given GFRP box beam which is shown in Fig.1, is a single span simple beam with calculated span length L=3000mm, web thickness tw =8mm, top and bottom flanges thickness tft=tfb=12mm (stiffness maximization when tft=tfb), web depth hw=276mm.
Considering the forming technology of compositing and mechanical coordination between steel and GFRP, the steel volume ratio should not exceed 50%.
Table1 and Table2 show the material properties of the box beam.
Table 1 Material properties Properties Modulus [GPa] Longitudinal Transverse Shear Poisson’s ratio Longitudinal Transverse GFRP top and bottom flanges 30 10 5 0.3 0.1 GFRP webs 19 17 9 0.35 .031 steel 206 79 0.3 Table 2 Material densities and reference price Properties GFRP steel Densities(103Kg/m3) 1.6 7.8 Prices(yuan/Kg) 25 4.8 s e FRP/steel composite plate FRP laminate Steel plate Fig. 2 Material model As shown in Fig. 2, the stress-strain relationship of pultruded GFRP (high fiber volume ratio) is close to linear, while the steel is simplified as ideal elastic-plastic.
Dimensions of GFRP box beam and material properties The given GFRP box beam which is shown in Fig.1, is a single span simple beam with calculated span length L=3000mm, web thickness tw =8mm, top and bottom flanges thickness tft=tfb=12mm (stiffness maximization when tft=tfb), web depth hw=276mm.
Considering the forming technology of compositing and mechanical coordination between steel and GFRP, the steel volume ratio should not exceed 50%.
Table1 and Table2 show the material properties of the box beam.
Table 1 Material properties Properties Modulus [GPa] Longitudinal Transverse Shear Poisson’s ratio Longitudinal Transverse GFRP top and bottom flanges 30 10 5 0.3 0.1 GFRP webs 19 17 9 0.35 .031 steel 206 79 0.3 Table 2 Material densities and reference price Properties GFRP steel Densities(103Kg/m3) 1.6 7.8 Prices(yuan/Kg) 25 4.8 s e FRP/steel composite plate FRP laminate Steel plate Fig. 2 Material model As shown in Fig. 2, the stress-strain relationship of pultruded GFRP (high fiber volume ratio) is close to linear, while the steel is simplified as ideal elastic-plastic.