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Research for Creation of High-Strength Structures and Joints by Setting up Local Material Properties
Online since: August 2007
Authors: Heinz Palkowski, Kai Michael Rudolph
Research for Creation of High-Strength Structures and Joints by Setting
up Local Material Properties
H.
To that purpose, different properties of the components are combined.
Additionally, the possibility of the use and calculation of local changes in strength, which can be influenced by factors such as joining processes, will be addressed.
Scaled material properties should be characterised in such a way that product developers have the possibility of interactively designing optimised high strength metallic structures, if they possess knowledge of the material properties and suitable rules for representation: material properties will be "constructed within".
Within the Collaborative Research Centre's 675 project, procedures will be developed for controlling the crack propagation by affecting materials locally.
To that purpose, different properties of the components are combined.
Additionally, the possibility of the use and calculation of local changes in strength, which can be influenced by factors such as joining processes, will be addressed.
Scaled material properties should be characterised in such a way that product developers have the possibility of interactively designing optimised high strength metallic structures, if they possess knowledge of the material properties and suitable rules for representation: material properties will be "constructed within".
Within the Collaborative Research Centre's 675 project, procedures will be developed for controlling the crack propagation by affecting materials locally.
Online since: June 2013
Authors: Gang Xu, Jin Ze Yu
Table 1 illustrates the results of tensile properties of the samples.
Table 1 Tensile properties of milk protein fiber/cotton blended yarn Trail No.
Relation of the strength of milk protein fiber pure yarn and twist factor The quality of the product, yield, cost, and the handling property were affected by the twist.
Different kinds of fibers have different twist factors. 18tex milk protein fiber pure yarns with different twist factors were spun.
Table 2 Tensile properties of milk protein fiber pure yarn with different twist factors Twist factor 300 320 340 360 380 390 400 Tenacity(cN/tex) 9.8 10.47 11.18 12.06 11.57 10.76 10.5 Elongation(%) 18.6 19.5 18.8 21 17.9 21.5 20.3 According to Table 2, the relation of the strength and the twist factor of milk protein fiber pure yarn are displaced in Fig.3.
Table 1 Tensile properties of milk protein fiber/cotton blended yarn Trail No.
Relation of the strength of milk protein fiber pure yarn and twist factor The quality of the product, yield, cost, and the handling property were affected by the twist.
Different kinds of fibers have different twist factors. 18tex milk protein fiber pure yarns with different twist factors were spun.
Table 2 Tensile properties of milk protein fiber pure yarn with different twist factors Twist factor 300 320 340 360 380 390 400 Tenacity(cN/tex) 9.8 10.47 11.18 12.06 11.57 10.76 10.5 Elongation(%) 18.6 19.5 18.8 21 17.9 21.5 20.3 According to Table 2, the relation of the strength and the twist factor of milk protein fiber pure yarn are displaced in Fig.3.
Online since: October 2016
Authors: Shi Chao Xiu, Xiao Liang Shi, Xiu Ming Zhang, Li Juan Liu
Study on Influential Factors of Grinding Surface Residual Stress in Dry for Controlling Workpiece Surface Integrity
Xiuming Zhang1, a, Shichao Xiu1,b *, Lijuan Liu2,c and Xiaoliang Shi1,d
1School of Mechanical Engineering & Automation, Northeastern University, Shenyang, China
2Taiyuan Heavy Industry Co., Ltd., Taiyuan, China
azyzyzhangyong@126.com, bzyzybibby@126.com, c163lijuan@163.com, d734453006@qq.com
Keywords: Residual stress, Surface integrity, Ground surface, Temperature field, Numerical simulation, Thermal-mechanical coupling.
(2) Mechanical properties of the workpiece, such as yield strength, elastic modulus, coefficient of linear expansion, tangent modulus, vary with temperature
Finite Element Simulation of Thermo-Mechanical Coupling Field.
Considering the temperature change will affected the material characteristics, thermal unit should change to the structure unit before the simulation analysis of residual. (2) Grid dividing.
Considering the grinding efficiency and other factors, for grinding 45 steel, if the grinding depth should be less than 20μm, the wheel speed is 30m/s and the workpiece speed is 0.05m/s, the residual stress will be less than 180MPa and the workpiece surface will not burn.
(2) Mechanical properties of the workpiece, such as yield strength, elastic modulus, coefficient of linear expansion, tangent modulus, vary with temperature
Finite Element Simulation of Thermo-Mechanical Coupling Field.
Considering the temperature change will affected the material characteristics, thermal unit should change to the structure unit before the simulation analysis of residual. (2) Grid dividing.
Considering the grinding efficiency and other factors, for grinding 45 steel, if the grinding depth should be less than 20μm, the wheel speed is 30m/s and the workpiece speed is 0.05m/s, the residual stress will be less than 180MPa and the workpiece surface will not burn.
Online since: December 2012
Authors: Jia Kai Liu, Xing Lin Qi
Adhesion property between SU-8 layer and substrate is subject to many factors such as substrate material, refractive index of substrate, impurity and the incoming innerstress because of different thermal expansion and so on.
Bubbles can induce the non-uniform of SU-8 photoresist, and affect the pattern size.
In the Micro electroform technics, electroform uniformity acts as an important factor in quality domination.
Chinese Journal of Mechanical Engineering, Vol.24(2011) No.5, p.837-838
Chinese Mechanical Engineering, Vol.16 (2005), No.4, p.448.
Bubbles can induce the non-uniform of SU-8 photoresist, and affect the pattern size.
In the Micro electroform technics, electroform uniformity acts as an important factor in quality domination.
Chinese Journal of Mechanical Engineering, Vol.24(2011) No.5, p.837-838
Chinese Mechanical Engineering, Vol.16 (2005), No.4, p.448.
Online since: August 2013
Authors: Qing Mei Jia, Wei Zhi Wang, Ying Li
Dangerous and harmful factors in the process of open-pit mine production and prevention countermeasures
Qingmei Jia 1,a ,Weizhi Wang 1,band Ying Li 1.c
1.
At the same time, the dangerous and harmful factors existing in the process of mine production to production personnel it also caused great security hidden danger.
Affects the production and economic benefits of mining enterprises, must be control.
The chemical composition of air in the workplaces, concentration and contact time is important factors that directly determine serious to human body.
Fire, explosion, blasting damage, rooffalling slicing, collapses and landslides, floods are the serious danger and harmful factors in the mine production process.
At the same time, the dangerous and harmful factors existing in the process of mine production to production personnel it also caused great security hidden danger.
Affects the production and economic benefits of mining enterprises, must be control.
The chemical composition of air in the workplaces, concentration and contact time is important factors that directly determine serious to human body.
Fire, explosion, blasting damage, rooffalling slicing, collapses and landslides, floods are the serious danger and harmful factors in the mine production process.
Online since: November 2011
Authors: M.Z.M. Saman, A.R. Hemdi, Norhayati Zakuan
Critical Success Factors of Green Design Implementation for Malaysia Automotive Industry
Zakuan, N.1 Saman, M.Z.M.2 and Hemdi, A.R. 3
1Fac. of Management and Human Resources Development, Universiti Teknologi Malaysia (UTM), Johor, Malaysia.
2Faculty of Mechanical Engineering, Universiti Teknologi Malaysia (UTM), Johor
3Faculty of Mechanical Engineering, Universiti Teknologi Mara (UiTM), Penang
e-mail: zameri@fkm.utm.my
Keywords: Green design concept, Malaysia automotive industries, Confirmatory factor analysis, Critical factors
Abstract.
The critical factors will be examined empirically via confirmatory factor analysis.
In this process, recyclability and recoverability rates depends on the design and materials properties of vehicles.
The results consistently supported the factor structure for Green Design Concept with five factors.
An instrument for measuring the critical factors of quality management.
The critical factors will be examined empirically via confirmatory factor analysis.
In this process, recyclability and recoverability rates depends on the design and materials properties of vehicles.
The results consistently supported the factor structure for Green Design Concept with five factors.
An instrument for measuring the critical factors of quality management.
Online since: February 2014
Authors: Zhan Qi Hu, Wu Zhao, Wei Tao Jia, Quan Bin Zhang
A new simulation model on frequency is proposed, to analyze mutual relationship between intrinsic frequency and other factors in system.
Simulations show that system vibration frequency is determined by mechanical properties, axial force, inner cutting fluid velocity and density.
(2) The vibration frequency on boring bar, is determined by mechanical properties, and also depends on axial force and inner cutting fluid velocity and fluid density.
Therefore, transverse vibration in boring bar containing inner cutting fluid velocity should be essential factor acting on boring bar
The flow of inner cutting fluid not only affect lateral vibration frequency, but also lead to lose the straight-line stability of the bar.
Simulations show that system vibration frequency is determined by mechanical properties, axial force, inner cutting fluid velocity and density.
(2) The vibration frequency on boring bar, is determined by mechanical properties, and also depends on axial force and inner cutting fluid velocity and fluid density.
Therefore, transverse vibration in boring bar containing inner cutting fluid velocity should be essential factor acting on boring bar
The flow of inner cutting fluid not only affect lateral vibration frequency, but also lead to lose the straight-line stability of the bar.
Online since: September 2020
Authors: Tolya Khezhev, Asker Ansokov, Ibragim Kerefov, Rustam Malkarov
The foam concrete compositions that can significantly reduce the Portland cement consumption and at the same time increase its strength properties are proposed.
The use of fosta nylon fibers in foam concrete increases their strength properties and positively affects the structure.
The main parameters of the dispersed reinforcement were taken as variable factors.: Х1 – is the percentage of reinforcement by volume , % (0,02; 0,20; 0,38; 0,56;0,74); Х2 – is the ratio of fiber length to diameter (200, 600, 1000).
Summary It can be concluded that the introduction of a sufficient number of short fibers into the foam concrete matrix leads to the material’s hardening, which is ensured not only by the reinforcing properties of the fibers, but also by their ability to positively affect the structure of cellular concrete.
Brusser, The structure and properties of cement concrete, Stroyizdat, Moscow, 1979.
The use of fosta nylon fibers in foam concrete increases their strength properties and positively affects the structure.
The main parameters of the dispersed reinforcement were taken as variable factors.: Х1 – is the percentage of reinforcement by volume , % (0,02; 0,20; 0,38; 0,56;0,74); Х2 – is the ratio of fiber length to diameter (200, 600, 1000).
Summary It can be concluded that the introduction of a sufficient number of short fibers into the foam concrete matrix leads to the material’s hardening, which is ensured not only by the reinforcing properties of the fibers, but also by their ability to positively affect the structure of cellular concrete.
Brusser, The structure and properties of cement concrete, Stroyizdat, Moscow, 1979.
Online since: May 2014
Authors: Cheng Ping Siao, Chao Cheng Chang
Friction is one of the key factors affecting the metal forming process.
The micro metal parts with two dimensions in sub-millimeter range may be produced by metal forming processes which offers the advantages of high production rate, low material loss and excellent mechanical properties of the products.
Moreover, micro metal parts have a high ratio of surface to volume that may increase the impact of friction on loads, materials flow and thus product properties.
Both may had close values of surface roughness but the friction factors were clearly different.
Ratios of cup height to rod length at different strokes and estimated friction factors Load.
The micro metal parts with two dimensions in sub-millimeter range may be produced by metal forming processes which offers the advantages of high production rate, low material loss and excellent mechanical properties of the products.
Moreover, micro metal parts have a high ratio of surface to volume that may increase the impact of friction on loads, materials flow and thus product properties.
Both may had close values of surface roughness but the friction factors were clearly different.
Ratios of cup height to rod length at different strokes and estimated friction factors Load.
Online since: July 2014
Authors: Robert Černý, Eva Vejmelková, Dana Koňáková, Veronika Spedlova, Kirill Polozhiy
The presented analysis of basic physical properties, mechanical, hygric and thermal properties shows that basalt is an appropriate material for cement based composites for high temperature applications.
Nevertheless, not all of these three factors have necessarily to be met together.
Influence of basalt was determined by measurements of a range of properties: basic physical, mechanical, hygric and thermal properties.
Mechanical properties.
Measurement of mechanical properties is summarized in table 3.
Nevertheless, not all of these three factors have necessarily to be met together.
Influence of basalt was determined by measurements of a range of properties: basic physical, mechanical, hygric and thermal properties.
Mechanical properties.
Measurement of mechanical properties is summarized in table 3.