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Online since: June 2010
Authors: Huang Ying Shen, Yu Shun Li, Zhen Wen Zhang, Tian Yuan Jiang, Wang Li Zhang
The results show that
the bamboo plywood and profiled steel sheet can effectively work together, the composite walls
possess wonderful seismic properties, and that changes of thickness or corrugation-height of
profiled steel sheet make very sharp differences to the properties of the walls.
Experimental results show that they can meet the requirements of mechanical properties of building slab [3, 4].
The ductility factor is calculated as µ=∆max/∆y.
References [1] Huaqiang Yu, Benhua Fei, and etc.: Variation in Tensile Properties and Relationship between Tensile Properties and Air-Dried Density for Moso Bamboo.
Scientia Silvae Sinicae Vol.42 (2006), p.72 [2] Zehui Jiang, Liang Chang, and etc.: Physical and Mechanical Properties of Glued Structural Laminated Bamboo.
Experimental results show that they can meet the requirements of mechanical properties of building slab [3, 4].
The ductility factor is calculated as µ=∆max/∆y.
References [1] Huaqiang Yu, Benhua Fei, and etc.: Variation in Tensile Properties and Relationship between Tensile Properties and Air-Dried Density for Moso Bamboo.
Scientia Silvae Sinicae Vol.42 (2006), p.72 [2] Zehui Jiang, Liang Chang, and etc.: Physical and Mechanical Properties of Glued Structural Laminated Bamboo.
Online since: January 2012
Authors: Chen Peng, Peng Fei Chen, Zheng Yi Ti
Influencing factors of slope stability and analysis of landslide model
Influencing factors of slope stability
The stability of the slope is determined by its internal and external factors,the internal factors is leading role and the status of main part to slope stability,it is the most fundamental.The external factors does induced and initiated destructive effect to slope stability.The internal factors include composition of slope's terrain feature,geological structure,rock mass's properties and structure,rock's initial stress,structure plane's development status .The external factors include the role of water and wind,earthquake,blasting vibration,engineering loads and other factors.
Inder to realizing every rock soil has own constitutive properties,there are more than ten kinds material models in FLAC3D.We always use Mohr-Coulumb plastic model and elastic model to do numerical simulation with the slope.The Mohr-Coulumb plastic model is suitable for the loosely-structured and granular media materials,and also the model building in underground excavation.It must be attentioned although Mohr-Coulumb plastic model is siutable for normal engineering research,but the cohesion and friction angle is much more important than other parameters.The elastic model is suitable for the ground stress field in gravitational plastic.
Determined of the model and index The paper did the numerical simulation in non-working wall based on the representative section.According to the preliminary analysis in non-working wall with the first mining area in Weijiamao open-pit mine,the simulation established model based on the 28th exploration line,its rock-soil body's physical and mechanical parameters are in the table 4.1.
Conclusion (1)Basis for the hydrogeological and engineering geological data in the first mining area in Weijiamao open-pit mine, analysis the slope's physical and mechanical properties.According the experiment get the physical and mechanics index with the weak layer in the coal seam roof and floor,knocking out the main factors of slope failure are the weak layer and the loess upper
Factors affecting the stability of the slope composition analysis.
Inder to realizing every rock soil has own constitutive properties,there are more than ten kinds material models in FLAC3D.We always use Mohr-Coulumb plastic model and elastic model to do numerical simulation with the slope.The Mohr-Coulumb plastic model is suitable for the loosely-structured and granular media materials,and also the model building in underground excavation.It must be attentioned although Mohr-Coulumb plastic model is siutable for normal engineering research,but the cohesion and friction angle is much more important than other parameters.The elastic model is suitable for the ground stress field in gravitational plastic.
Determined of the model and index The paper did the numerical simulation in non-working wall based on the representative section.According to the preliminary analysis in non-working wall with the first mining area in Weijiamao open-pit mine,the simulation established model based on the 28th exploration line,its rock-soil body's physical and mechanical parameters are in the table 4.1.
Conclusion (1)Basis for the hydrogeological and engineering geological data in the first mining area in Weijiamao open-pit mine, analysis the slope's physical and mechanical properties.According the experiment get the physical and mechanics index with the weak layer in the coal seam roof and floor,knocking out the main factors of slope failure are the weak layer and the loess upper
Factors affecting the stability of the slope composition analysis.
Online since: November 2007
Authors: Graeme E. Murch, Andreas Öchsner, Irina V. Belova, Nilindu Muthubandara
Öchsner2, d
1
Diffusion in Solids, Group, School of Engineering,
The University of Newcastle, Callaghan, NSW 2308, Australia
2
Centre for Mechanical Technology and Automation, Department of Mechanical Engineering
University of Aveiro, Aveiro, Portugal
a
Irina.Belova@newcastle.edu.au, b Graeme.Murch@newcastle.edu.au,
c Nilindu.Muthubandara@studentmail.newcastle.edu.au, d aoechsner@mec.ua.pt
Keywords: Segregation, diffusion, Monte Carlo, interfaces, composites
Abstract.
The presence of atomic oxygen at internal metal-ceramic oxide interfaces significantly affects the physical properties of the interfaces which in turn affects the bulk properties of the material.
It is known that the presence of solute atoms such as oxygen at internal metal-ceramic oxide interfaces has a profound effect on the physical properties of the interfaces and ultimately on the bulk properties of the composite material.
In fact, this condition can be used as a definition for the segregation factor.)
Thus if we, say, multiply both w12 and w21 by a factor of 6.25 x 10 2 then the segregation layer is seen then to have a new apparent width of 10 -8 m.
The presence of atomic oxygen at internal metal-ceramic oxide interfaces significantly affects the physical properties of the interfaces which in turn affects the bulk properties of the material.
It is known that the presence of solute atoms such as oxygen at internal metal-ceramic oxide interfaces has a profound effect on the physical properties of the interfaces and ultimately on the bulk properties of the composite material.
In fact, this condition can be used as a definition for the segregation factor.)
Thus if we, say, multiply both w12 and w21 by a factor of 6.25 x 10 2 then the segregation layer is seen then to have a new apparent width of 10 -8 m.
Online since: August 2014
Authors: Alena Vagaská, Miroslav Gombár, Ján Kmec, Peter Michal
When assessing the role of machining in engineering production, its significant properties are versatility and flexibility.
The second one is physical and chemical properties of a surface layer of machine parts.
Independent variables affecting the process are called factors and are denoted by .
From a user’s point of view, for the given case, cutting conditions which affect the studied characteristics of the surface morphology were considered to be the factors (process parameters).
Monková, Side milling factors analysis affecting the surface irregularities of high-grade steel E295, Tehnicki Vjesnik 15/2 (2008) 19-23
The second one is physical and chemical properties of a surface layer of machine parts.
Independent variables affecting the process are called factors and are denoted by .
From a user’s point of view, for the given case, cutting conditions which affect the studied characteristics of the surface morphology were considered to be the factors (process parameters).
Monková, Side milling factors analysis affecting the surface irregularities of high-grade steel E295, Tehnicki Vjesnik 15/2 (2008) 19-23
Online since: December 2014
Authors: Radomír Mendřický, Petr Keller
In manufacturing by means of a 3D printer as well as in any other manufacturing technology, the precision of the end product is affected by a variety of factors and effects that shall be familiarised with in order to provide high dimensional and shape precision.
It is necessary to clear the manufactured part of all excessive powder, remove from the base and remove the supporting structures in a mechanical way.
Laser head Laser beam Laser processed area Powder bed Layer thickness Piston Substrate Blade Powder Powder container Fig. 1 The basic principle of SLM technology [1] Designing the Parts for Precision Verification of SLM 280 HL Machine The process of 3D parts manufacturing is influenced by many factors that affects the general precision and quality of the manufactured parts.
It is also important to design the model so that the key dimensions of the model, that will be inspected, will not be surrounded by the supporting structure, because the mechanical removal after the manufacturing might affect the results of manufacturing precision.
According to the manufacturer's information, the properties of part produced in such manner are 99% identical to conventional castings of the same material.
It is necessary to clear the manufactured part of all excessive powder, remove from the base and remove the supporting structures in a mechanical way.
Laser head Laser beam Laser processed area Powder bed Layer thickness Piston Substrate Blade Powder Powder container Fig. 1 The basic principle of SLM technology [1] Designing the Parts for Precision Verification of SLM 280 HL Machine The process of 3D parts manufacturing is influenced by many factors that affects the general precision and quality of the manufactured parts.
It is also important to design the model so that the key dimensions of the model, that will be inspected, will not be surrounded by the supporting structure, because the mechanical removal after the manufacturing might affect the results of manufacturing precision.
According to the manufacturer's information, the properties of part produced in such manner are 99% identical to conventional castings of the same material.
Online since: February 2022
Authors: Md Mazedur Rahman, Jakiya Sultana, Md Shazzad Hossain, Muhammad Adeel
Stitch length or loop length is one of the important factors, which is associated with knit fabric [7-8] dimension and other properties including GSM (gram per square meter).
Tao et al. [16] studied that yarn twist factor and fabric tightness factor have a correlation with fabric spirality.
However, the fabric weight is not affected by spirality in the dyed fabric.
In addition, combed yarn was selected due to their good mechanical properties compared to carded yarn.
Hasan, , “Effect of Stitch Length and Fabric Constructions on Dimensional and Mechanical Properties of Knitted Fabrics”, World Applied Sciences Journal, Vol. 32, No. 9, (2014), 1991-1995.
Tao et al. [16] studied that yarn twist factor and fabric tightness factor have a correlation with fabric spirality.
However, the fabric weight is not affected by spirality in the dyed fabric.
In addition, combed yarn was selected due to their good mechanical properties compared to carded yarn.
Hasan, , “Effect of Stitch Length and Fabric Constructions on Dimensional and Mechanical Properties of Knitted Fabrics”, World Applied Sciences Journal, Vol. 32, No. 9, (2014), 1991-1995.
Online since: March 2013
Authors: Shi Quan Liu, Xian Qin Hou, Dai Dong Guo
Typically, the mechanic properties of ceramics decrease after either long service times at high temperatures or cycles of temperature changes.
It is a comprehensive manifestation of the mechanical and thermal properties of ceramics under heating condition [3].
As a result, the influencing factors, test conditions and test results of ceramics are very different from those of metals.
Yan, Mechanical Property Loss of Hot-Pressed Si3N4 under Thermal Fatigue Conditions, J.
Kingery, Factors affecting thermal stress resistance of ceramic materials, J.
It is a comprehensive manifestation of the mechanical and thermal properties of ceramics under heating condition [3].
As a result, the influencing factors, test conditions and test results of ceramics are very different from those of metals.
Yan, Mechanical Property Loss of Hot-Pressed Si3N4 under Thermal Fatigue Conditions, J.
Kingery, Factors affecting thermal stress resistance of ceramic materials, J.
Online since: May 2014
Authors: Chao Chang Arthur Chen, Shou Chih Cheng, Ming Hsien Chan, Wen Ching Hsu, Shih Lung Cheng
Design and Test of a Rapid Thermal Annealing Furnace for Improving Surface Properties of Silicon Brick in Multi-Wire Sawing Process
Chao-Chang A.
The micro-Vickers (Akashi MVK-H1) and SEM (JSM-6500F, JOEL) instruments have been used to observe the improvement of rectified material properties of bulk silicon substrate.
Recent literature review shows that many factors may affect the efficiency and quality of sliced silicon wafer or substrates.
Some vibration and elasto-hydrodynamics effects of such piano wire also induce an unstable state during slicing the wafer substrate and then affecting the saw marks [2, 3].
Mechanical properties of bulk and thin film copper material under RTA environment can be observed and compared with variation of hardness [12].
The micro-Vickers (Akashi MVK-H1) and SEM (JSM-6500F, JOEL) instruments have been used to observe the improvement of rectified material properties of bulk silicon substrate.
Recent literature review shows that many factors may affect the efficiency and quality of sliced silicon wafer or substrates.
Some vibration and elasto-hydrodynamics effects of such piano wire also induce an unstable state during slicing the wafer substrate and then affecting the saw marks [2, 3].
Mechanical properties of bulk and thin film copper material under RTA environment can be observed and compared with variation of hardness [12].
Online since: June 2007
Authors: Li Song, Feng Tao Wei, Shui Cheng Yang
Department of Mechanical engineering, Xi'an University of Technology
Xi'an, Shaanxi, 710048, P.R.China
2.
Based on the crack modeling, the finite element method (FEM) was used to calculate and analyze the displacement field, stress field and stress intensity factors of the cracks under the conditions of warm start, cold start and normal operation, and the residual service life was predicted.
Introduction Header, one of the most important pressure vessels of generator group, directly affects the smooth running of power plant.
And the displacement field, stress field and stress intensity factor of the tip of crack were calculated by Ansys.
Several assumptions and simplifications are as follows for header: (1) The materials of welded seam, header's end cover and barrel are isotropic elasto- plasticity, without regard to creep properties; (2) Component tolerances are not considered; (3) Welding residual stresses have been removed; (4) Crack blunting isn't considered.
Based on the crack modeling, the finite element method (FEM) was used to calculate and analyze the displacement field, stress field and stress intensity factors of the cracks under the conditions of warm start, cold start and normal operation, and the residual service life was predicted.
Introduction Header, one of the most important pressure vessels of generator group, directly affects the smooth running of power plant.
And the displacement field, stress field and stress intensity factor of the tip of crack were calculated by Ansys.
Several assumptions and simplifications are as follows for header: (1) The materials of welded seam, header's end cover and barrel are isotropic elasto- plasticity, without regard to creep properties; (2) Component tolerances are not considered; (3) Welding residual stresses have been removed; (4) Crack blunting isn't considered.
Online since: July 2016
Authors: Ciro Faella, Enzo Martinelli
They are based on few parameters dealing with:
- the intensity of the expected seismic event;
- the elastic properties of both the main structure and the non-structural component;
- the position in height of the non-structural components within the main structure.
The other symbols have been already defined and do not change their mechanical meaning.
(12) The properties defined in (9)-(12) completely control the response of the 2DOF system within the linear-elastic range.
Figure 2 deals with the case of a short period structure (T1=0.2 s and T1=0.5 s) and shows that the Fa/maSag ratio is significantly affected by the force reduction factors of the main structure.
Moreover, the force reduction factor plays a less significant role in affecting the dynamic response of the non-structural component and, especially for long period structures (T1=2.0 s), the predictions based on Eurocode 8 are generally too conservative.
The other symbols have been already defined and do not change their mechanical meaning.
(12) The properties defined in (9)-(12) completely control the response of the 2DOF system within the linear-elastic range.
Figure 2 deals with the case of a short period structure (T1=0.2 s and T1=0.5 s) and shows that the Fa/maSag ratio is significantly affected by the force reduction factors of the main structure.
Moreover, the force reduction factor plays a less significant role in affecting the dynamic response of the non-structural component and, especially for long period structures (T1=2.0 s), the predictions based on Eurocode 8 are generally too conservative.