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Online since: November 2022
Authors: Samya Chebout, Ramdane Bahar
Table 1: Geotechnical soils properties.
Therefore, the linear elastic law (Hooke's law) is used considering the mechanical properties; Young’s Modulus E and Poisson ratio u.
This can be explained by the fact that the pore pressure variation depends on the volume change of the skeleton, which depends of the material properties.
Geotechnical properties are summerazid in Table 1.
Scott, Shear Moduli and Damping Factors of Earth Dam.
Therefore, the linear elastic law (Hooke's law) is used considering the mechanical properties; Young’s Modulus E and Poisson ratio u.
This can be explained by the fact that the pore pressure variation depends on the volume change of the skeleton, which depends of the material properties.
Geotechnical properties are summerazid in Table 1.
Scott, Shear Moduli and Damping Factors of Earth Dam.
Online since: August 2012
Authors: Agnieszka Szkliniarz
Unfavourable influence of coarse-grain microstructure and favourable influence of its refinement on a number of mechanical properties place the problem of finding solutions for the effective grain refinement in the circle of fundamental issues for this group of alloys [9÷11].
Taking these factors into consideration, it seems appropriate to become interested in heat treatment procedures as alternative methods for grain refinement of TiAl intermetallic alloys.
The result is improvement in strength properties of alloys subject to heat treatment.
The grain refinement of TiAl intermetallic alloy by applying cyclic heat treatment is an efficient method for improvement in mechanical and plastic properties as well as hardness of alloys.
The application of under-annealing after cyclic heat treatment results in further increase in plastic properties.
Taking these factors into consideration, it seems appropriate to become interested in heat treatment procedures as alternative methods for grain refinement of TiAl intermetallic alloys.
The result is improvement in strength properties of alloys subject to heat treatment.
The grain refinement of TiAl intermetallic alloy by applying cyclic heat treatment is an efficient method for improvement in mechanical and plastic properties as well as hardness of alloys.
The application of under-annealing after cyclic heat treatment results in further increase in plastic properties.
Online since: October 2013
Authors: Yun Liu
In construction, due to conditions of preparatory work of the project, it often appears that the implementation of certain reality does not match with the original design documents and the discovery of the original design errors, omissions, or other objective factors must change the original design solutions, structure, and adjust to the original contract content of the work, which resulted in engineering changes.
Any engineering changes to the project is bound to affect the normal operation of construction, and will impact the schedule, cost, quality, increasing capital investment of projects, not to mention affecting the project's investors’ earnings.
Sub-projects usually belong to different design departments, so their design drawings have conflicts, in their development of the situation, for the complexity of the building, such as structure, water, HVAC, fire and other facilities in the spatial configuration. such as: mechanical and electrical equipments lack of design space, installation space close to the structure, the pipeline overlap causes ceiling’s less or in the pipeline installation process, the original design did not take into account the equipment and pipe pier, there is in the original design elevation no installation space.
The so-called process of reasoning is to, from existing preconditions--knowledge base, which has been rigorously defined (eg. concepts, properties, relationships, and rules) draw the logical conclusion.
Any engineering changes to the project is bound to affect the normal operation of construction, and will impact the schedule, cost, quality, increasing capital investment of projects, not to mention affecting the project's investors’ earnings.
Sub-projects usually belong to different design departments, so their design drawings have conflicts, in their development of the situation, for the complexity of the building, such as structure, water, HVAC, fire and other facilities in the spatial configuration. such as: mechanical and electrical equipments lack of design space, installation space close to the structure, the pipeline overlap causes ceiling’s less or in the pipeline installation process, the original design did not take into account the equipment and pipe pier, there is in the original design elevation no installation space.
The so-called process of reasoning is to, from existing preconditions--knowledge base, which has been rigorously defined (eg. concepts, properties, relationships, and rules) draw the logical conclusion.
Online since: April 2021
Authors: Risdiana Risdiana, Sahrul Hidayat, Sarifah Mudaim
Due to its properties, activated carbon is widely used in various applications, such as color substance adsorbents [2], heavy metal adsorbens [3], gas adsorbent [4], catalyst support, super capasitor electrodes [5] and other functional applications.
Sample Conductivity [S/m] S2 S3 S4 S5 S6 0.0017 0.0021 0.0026 0.0029 0.8525 Based on the electrical conductivity value data in table 2, it can be seen that the carbonization temperature affects the electrical conductivity value.
Baqiya et al., Structural Study on Graphene-Based Particles Prepared from Old ,Coconut Shell by Acid–Assisted Mechanical Exfoliation, Adv.
Hameed, Factors Affecting the Carbon Yield and Adsorption Capability of The Mangosteen Peel Activated Carbon Prepared by Microwave Assisted K2CO3 Activation, Chem.
Sample Conductivity [S/m] S2 S3 S4 S5 S6 0.0017 0.0021 0.0026 0.0029 0.8525 Based on the electrical conductivity value data in table 2, it can be seen that the carbonization temperature affects the electrical conductivity value.
Baqiya et al., Structural Study on Graphene-Based Particles Prepared from Old ,Coconut Shell by Acid–Assisted Mechanical Exfoliation, Adv.
Hameed, Factors Affecting the Carbon Yield and Adsorption Capability of The Mangosteen Peel Activated Carbon Prepared by Microwave Assisted K2CO3 Activation, Chem.
Online since: January 2016
Authors: Edy Saputra, Monita Olivia, Yudhi Salman Dwi Satya
Previous study shows that the mechanical properties of the geopolymer concrete were competitive with those of OPC concrete and could provide more durable alternative to the OPC concrete in a seawater environment [6].
The reaction steps of geopolymerisation are affected by several factors, one of them is the activating solutions relating to silicate concentration (SiO2/M2O ratio), type of alkali metal cations, concentration of alkali solution (H2O/M2O ratio, where M is equal to Na and K), and water content (water/binder ratio) [12].
FTIR results of geopolymer mortar after exposed in acidic peat water The stretch band of G91, indicated there was no atmospheric carbon or leaching that affecting the change in compressive strength.
The reaction steps of geopolymerisation are affected by several factors, one of them is the activating solutions relating to silicate concentration (SiO2/M2O ratio), type of alkali metal cations, concentration of alkali solution (H2O/M2O ratio, where M is equal to Na and K), and water content (water/binder ratio) [12].
FTIR results of geopolymer mortar after exposed in acidic peat water The stretch band of G91, indicated there was no atmospheric carbon or leaching that affecting the change in compressive strength.
Online since: September 2011
Authors: Si Ping Lu, Ming Jian Zhao
During the bridge services, due to long-term loading effects, fatigue effects and material aging, natural disasters, environmental erosion, and traffic accidents and other factors make prestress fall, affect the safety of bridge structures and durability, and further bring to bridge potential safety hazards[2].
Therefore, the prestress is one of the most important security factors for prestressed bridges.
As the effects of various factors on the structure have uncertainty, the loss of prestress can also calculated by probability analysis method [3].
Table 6 Measured material properties of the prestressed steel wires Items Elastic modulus Maximum tensile stress Tensile strength Yield stress Yield strength Numeric 199GPa 31.933KN 1630MPa 31.59KN 1610MPa Table 7 Measured values of the prestressed steel strands Testing points Design tension stress[MPa] Strain values[] Stress[MPa] 246-1 1200 2330 463.67 246-2 1200 1987 395.41 919-1 1200 2543 506.06 919-2 1200 197 (Strain gauge teared) —— 1092-1 1200 2136 425.06 1092-2 1200 1977 393.42 According to the calculation and analysis, the selected prestressed high strength steel wires cannot reach the design requirement after windowing and damage testing.
Evaluation of prestressed reinforcement corrosion and mechanical properties of the degree of attenuation.
Therefore, the prestress is one of the most important security factors for prestressed bridges.
As the effects of various factors on the structure have uncertainty, the loss of prestress can also calculated by probability analysis method [3].
Table 6 Measured material properties of the prestressed steel wires Items Elastic modulus Maximum tensile stress Tensile strength Yield stress Yield strength Numeric 199GPa 31.933KN 1630MPa 31.59KN 1610MPa Table 7 Measured values of the prestressed steel strands Testing points Design tension stress[MPa] Strain values[] Stress[MPa] 246-1 1200 2330 463.67 246-2 1200 1987 395.41 919-1 1200 2543 506.06 919-2 1200 197 (Strain gauge teared) —— 1092-1 1200 2136 425.06 1092-2 1200 1977 393.42 According to the calculation and analysis, the selected prestressed high strength steel wires cannot reach the design requirement after windowing and damage testing.
Evaluation of prestressed reinforcement corrosion and mechanical properties of the degree of attenuation.
Online since: September 2013
Authors: Shi Cun Sun, Ze Song Wei
The paper focuses on how building materials affect architecture form and ultimately is reflected in our academic design and daily life, how the development of construction materials in the history and at present influences the tectonic form, and whether it is feasible to introduce the element of construction materials into architectural appraisal.
The Architectural Form Innovation Through Modern Building Materials Understanding the history of the tectonic way of corresponding material, it will be much easier for us to understand the radical changes of architectural form since the industrial revolution: human beings uses more building materials freely, the higher performance of materials achieving is the decisive factor.
To reflect the mechanical properties of materials faithfully is just the essence of tectonic culture, the wood’s characteristics of high specific strength and easy processing is obviously .Tadao Ando, another master architect designed Japan Pavilion in Seville, Spain Expo which also reflects greatly the characteristics of the wood structure - high specific strength and wood tectonic does not require a large cross-section, instead of the small cross-section components intensive stack, which not only can get the same intensity of the large cross-section, but makes the structure more stability by scatting the nodes, and the inner the mechanism of tectonic that the ancient Chinese brackets was produced.
Because the simple requirements of the construction material for recycled is not so efficient as good as people thought it would be [5] For materials, to judge energy-saving or not, we should not only pay attention to the impact of the physical properties of the building, not even a single included in the energy production process, but to consider their life-cycle energy consumption, that is, the value of recycled.
Kenneth said, CCTV building, whether from the construction of honest or in the view of logical in project, reaches the perverse extent… it is not necessarily to create a compelling image so indiscriminate and irrational in the use of the material It may be the helpless cries of the architect adhere to the ideal of tectonic when the building materials are difficult to breakthrough nowadays, however, it is no doubt that the advances in building materials will affect our architectural forms, even the content.
The Architectural Form Innovation Through Modern Building Materials Understanding the history of the tectonic way of corresponding material, it will be much easier for us to understand the radical changes of architectural form since the industrial revolution: human beings uses more building materials freely, the higher performance of materials achieving is the decisive factor.
To reflect the mechanical properties of materials faithfully is just the essence of tectonic culture, the wood’s characteristics of high specific strength and easy processing is obviously .Tadao Ando, another master architect designed Japan Pavilion in Seville, Spain Expo which also reflects greatly the characteristics of the wood structure - high specific strength and wood tectonic does not require a large cross-section, instead of the small cross-section components intensive stack, which not only can get the same intensity of the large cross-section, but makes the structure more stability by scatting the nodes, and the inner the mechanism of tectonic that the ancient Chinese brackets was produced.
Because the simple requirements of the construction material for recycled is not so efficient as good as people thought it would be [5] For materials, to judge energy-saving or not, we should not only pay attention to the impact of the physical properties of the building, not even a single included in the energy production process, but to consider their life-cycle energy consumption, that is, the value of recycled.
Kenneth said, CCTV building, whether from the construction of honest or in the view of logical in project, reaches the perverse extent… it is not necessarily to create a compelling image so indiscriminate and irrational in the use of the material It may be the helpless cries of the architect adhere to the ideal of tectonic when the building materials are difficult to breakthrough nowadays, however, it is no doubt that the advances in building materials will affect our architectural forms, even the content.
Online since: April 2016
Authors: Yong Liu, Jie Chen
Backfilling materials and the aggregate in cemented filling material is mainly river sand and mud, and by the pipe gravity or pump pressure to underground stope, so aggregate contains a certain amount of mud on the rheological properties of the transmission.
Reference [1] Henghu Sun, Jiang Linhua,etc.High water consolidated filling mining [M].Beijing:mechanical industry press,1998:1-12
Properties of concrete incorporating fly ash and ground granulated blast-furnace slag[J].
Mechanical properties of paste filling material is the first step of the experiment [J].
Strength of paste filling material is impact factor analysis[J].
Reference [1] Henghu Sun, Jiang Linhua,etc.High water consolidated filling mining [M].Beijing:mechanical industry press,1998:1-12
Properties of concrete incorporating fly ash and ground granulated blast-furnace slag[J].
Mechanical properties of paste filling material is the first step of the experiment [J].
Strength of paste filling material is impact factor analysis[J].
Online since: February 2019
Authors: Koh Heng Boon, RASHEED ALTOUHAMI, Hassan Ali, Ashraf Radwan, Ng Wei Shen, Mundr Mansur
The large number of influence factors, such as anisotropy of units, the dimension of units, joint width, material properties of the units and mortar arrangement of bed as well as head joints and quality of workmanship, make the simulation of masonry structures extremely difficult.
The basic mechanical properties of the masonry are strongly influenced by the mechanical properties of its constituents namely brick and mortar.
The workability may be considered one of the most important properties of mortar because it influences directly the bricklayer's work [5].
It is important to mention that the quality of the workmanship can influence considerably the mechanical properties of masonry.
Mortar is generally evaluated by two properties: workability and compressive strength.
The basic mechanical properties of the masonry are strongly influenced by the mechanical properties of its constituents namely brick and mortar.
The workability may be considered one of the most important properties of mortar because it influences directly the bricklayer's work [5].
It is important to mention that the quality of the workmanship can influence considerably the mechanical properties of masonry.
Mortar is generally evaluated by two properties: workability and compressive strength.
Online since: February 2011
Authors: Ji Zhuang Hui, Wei Wang, Ya Ke Zou, Jie Cao
Meanwhile, the simulation result is verified.
1 Simulation and analysis of fatigue life of the sheet-metal type hydraulic torque converter
Fatigue failure is regarded as one of main causes of engineering structure failure and mechanical failure.
In the process of actual numerical simulation, greater convergence achievements are made by repeatedly adjusting the relaxing factor variables. 1.2 Settings of housing material attribute Both turbine and impeller are made from #10 steels.
Table 1 Physical Properties of Housing Material 248 392 202200 0.28 The finite element model of both impeller and turbine is acquired after grid division, loading, material defining and attribute adding. 1.3 Setting fatigue life parameters MSC.Patran is applied to analyze and process the finite element model of both impeller and turbine and then generate the input file of MSC.Nastran.
According to the literature, most scholars conducting the relevant tests converter that the torque converter at work, similar to the oil pressure to bear a sinusoidal load, thus making of the load settings that affect the force of the main converter Hydraulic factors change over time into a sinusoidal set unit load versus time curve. 1.5 Computation and analysis of the housing fatigue life After the material S-N curve and the relation of load variation along time are confirmed, the housing stress-strain results shall be given to MSC.Fatigue.
In the process of actual numerical simulation, greater convergence achievements are made by repeatedly adjusting the relaxing factor variables. 1.2 Settings of housing material attribute Both turbine and impeller are made from #10 steels.
Table 1 Physical Properties of Housing Material 248 392 202200 0.28 The finite element model of both impeller and turbine is acquired after grid division, loading, material defining and attribute adding. 1.3 Setting fatigue life parameters MSC.Patran is applied to analyze and process the finite element model of both impeller and turbine and then generate the input file of MSC.Nastran.
According to the literature, most scholars conducting the relevant tests converter that the torque converter at work, similar to the oil pressure to bear a sinusoidal load, thus making of the load settings that affect the force of the main converter Hydraulic factors change over time into a sinusoidal set unit load versus time curve. 1.5 Computation and analysis of the housing fatigue life After the material S-N curve and the relation of load variation along time are confirmed, the housing stress-strain results shall be given to MSC.Fatigue.