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Online since: August 2015
Authors: Błażej Skoczeń, Aneta Ustrzycka
The problem undertaken in the present work concerns the kinetics of evolution of radiation induced damage under mechanical loads.
Introduction As an example of typical problem related to evolution of radiation induced damage, degradation of material properties in a thin-walled irradiated cylindrical part of detector of particles has been investigated.
In order to combine both types of damage: radiation induced and of mechanical origin, additive rule is postulated.
Single cycle is composed of emission of the particles flux, production of cluster of voids and further mechanical loading.
Given the fact, that increment of damage is for real applications rather small (), the effect of existing voids, forming effective sinks for new radiation induced vacancies, is negligible and it slightly affects formation of new clusters.
Introduction As an example of typical problem related to evolution of radiation induced damage, degradation of material properties in a thin-walled irradiated cylindrical part of detector of particles has been investigated.
In order to combine both types of damage: radiation induced and of mechanical origin, additive rule is postulated.
Single cycle is composed of emission of the particles flux, production of cluster of voids and further mechanical loading.
Given the fact, that increment of damage is for real applications rather small (), the effect of existing voids, forming effective sinks for new radiation induced vacancies, is negligible and it slightly affects formation of new clusters.
Online since: October 2024
Authors: Alin Popescu, Aurelia-Ioana Biholar, Antonio-Andrei Cristian, Mircea Burca, Viorel Ungureanu, Ioan Both
The results of the experimental tests and numerical analysis showed that the provisions of the code can be used to determine the bearing capacity as well as the multitude of parameters affecting the connection.
The mean values of the strength properties and elongation characteristics are presented in Table 3.
Then, these values have to be divided by partial factors gm and by explicit conversion factors hd (if needed); (2) design values are being determined directly considering a conversion of test results (explicitly or implicitly) and considering a required reliability, also.
For a design value determination process for a single property X, the given fractile factors kn are used from Table D1 of [17].
“Effect of plate thickness on mechanical properties and failure behaviors of resistance spot welded advanced high strength steels”, Journal of Manufacturing Processes, 95, 392–404, 2023
The mean values of the strength properties and elongation characteristics are presented in Table 3.
Then, these values have to be divided by partial factors gm and by explicit conversion factors hd (if needed); (2) design values are being determined directly considering a conversion of test results (explicitly or implicitly) and considering a required reliability, also.
For a design value determination process for a single property X, the given fractile factors kn are used from Table D1 of [17].
“Effect of plate thickness on mechanical properties and failure behaviors of resistance spot welded advanced high strength steels”, Journal of Manufacturing Processes, 95, 392–404, 2023
Online since: June 2017
Authors: Hsin Han Tung, Chun Hung Lai, Ching Fang Tseng, Wen Shiush Chen, Cheng Hsing Hsu, Yu Chuan Chen, Jenn Sen Lin
The correlation between the microstructure and microwave dielectric properties was also investigated.
Further increases in composition x result in the degradation of grain uniformity, while a porous microstructure is observed at the compositions higher than x = 0.08, which may directly affect its microwave dielectric properties.
The increase in apparent density may directly improve the microwave dielectric properties.
Several factors influence the microwave dielectric loss and can be divided into two partial factors which are intrinsic loss and extrinsic loss [15].
Ohsato, Microwave dielectric properties of BaxLa4Ti3 + xO12 + 3x (x = 0.0–1.0) ceramics, J.
Further increases in composition x result in the degradation of grain uniformity, while a porous microstructure is observed at the compositions higher than x = 0.08, which may directly affect its microwave dielectric properties.
The increase in apparent density may directly improve the microwave dielectric properties.
Several factors influence the microwave dielectric loss and can be divided into two partial factors which are intrinsic loss and extrinsic loss [15].
Ohsato, Microwave dielectric properties of BaxLa4Ti3 + xO12 + 3x (x = 0.0–1.0) ceramics, J.
Online since: September 2015
Authors: Carmen Martínez-García, Dolores Eliche-Quesada, Luis Pérez-Villarejo, M.T. Cotes-Palomino
Clay-based materials are heterogeneous products which can accommodate different wastes or by-products without modified production processes or affected their properties or final characteristics [4, 5].
Lower values of water suction contributes to having good durability, and, consequently, higher resistance to the natural environment factors.
Again, the incorporation of 3 wt % of SDE barely affects these properties, obtaining values of 20.5 % of water absorption and 33.1 % of apparent porosity.
One of the disadvantages resulting from the use of lightening additives, which increase porosity, is the impairment of the mechanical properties of bricks.
Thus, this work demonstrated that spent diatomite earth waste can advantageous use in lower proportion (3 wt %) as silica precursor in clay basic bricks introducing little changes in the final properties of the bricks, improving the mechanical properties.
Lower values of water suction contributes to having good durability, and, consequently, higher resistance to the natural environment factors.
Again, the incorporation of 3 wt % of SDE barely affects these properties, obtaining values of 20.5 % of water absorption and 33.1 % of apparent porosity.
One of the disadvantages resulting from the use of lightening additives, which increase porosity, is the impairment of the mechanical properties of bricks.
Thus, this work demonstrated that spent diatomite earth waste can advantageous use in lower proportion (3 wt %) as silica precursor in clay basic bricks introducing little changes in the final properties of the bricks, improving the mechanical properties.
Online since: January 2011
Authors: Ji Hong Zhou, Wen Xiang Xia, Jin Cheng Li
Physical method by means of physical properties and mechanical device, eliminate oil pollution of the sea surface and coast.It is the main method to deal with oil spill both at home and abroad, which is applicable to the recycling thicker layers.
But its weakness is affected by factors such as wind and viscosity.
So the high quality oil boom must have perfect properties such as easy to outspread , recover, and wash, wear-resisting, certain strength as well as wind resistance ect.
Mechanical Method.
The vaccination exogenous microorganism in the restorated environment could face multiple pressure, namely, one is the competition of native microorganism, second is the suitability of ecological factors in the environment, third is environmental toxicity of pollutants in being restorated environment.
But its weakness is affected by factors such as wind and viscosity.
So the high quality oil boom must have perfect properties such as easy to outspread , recover, and wash, wear-resisting, certain strength as well as wind resistance ect.
Mechanical Method.
The vaccination exogenous microorganism in the restorated environment could face multiple pressure, namely, one is the competition of native microorganism, second is the suitability of ecological factors in the environment, third is environmental toxicity of pollutants in being restorated environment.
Online since: December 2016
Authors: Wojciech Kubissa, Paweł Las, Roman Jaskulski
The composition of the mixture is one of the elements affecting the water absorption capacity of concrete.
This additional factor makes that the properties of the concrete mix with RCA, including in particular the water absorption, may significantly differ from the properties of the material with exactly the same composition, but made entirely with natural aggregate.
But this is not the only factor affecting the value of water absorption obtained in the study.
Ribeiro, Modeling of mechanical properties and durability of recycled aggregate concretes, Constr.
Kaplan, Concrete at high temperatures: material properties and mathematical models, Longman, 1996
This additional factor makes that the properties of the concrete mix with RCA, including in particular the water absorption, may significantly differ from the properties of the material with exactly the same composition, but made entirely with natural aggregate.
But this is not the only factor affecting the value of water absorption obtained in the study.
Ribeiro, Modeling of mechanical properties and durability of recycled aggregate concretes, Constr.
Kaplan, Concrete at high temperatures: material properties and mathematical models, Longman, 1996
Online since: September 2023
Authors: Mohammed Abdulkareem Adisa, Ahmed Lukman, Adeniyi Olakiitan, Olumoyewa Dotun Atoyebi, Adeyemi Adesina, Samson Olalekan Odeyemi
Both the fresh and mechanical properties were determined at the Department of Civil Engineering, Kwara State University, Malete.
3.
Fig. 1 Slump flow of CFRSCC Fig. 2 L-Box of CFRSCC 3.2 Mechanical Properties In evaluating the mechanical properties of the concrete mixes, the results of the compressive and flexural strengths are shown in Fig. 3.
Domone, A review of the hardened mechanical properties of self-compacting concrete, Cement and Concrete Composites, 29(1), (2007), 1–12
Elango, Study on mechanical properties of fibre reinforced self-compacting concrete, Materials Today: Proceedings, 45(2), (2021), 3124-3131. doi: 10.1016/j.matpr.2020.12.214
Gonen, Mechanical and fresh properties of fibre reinforced self-compacting lightweight concrete, Scientia Iranica, 22(2), (2015), 313-318
Fig. 1 Slump flow of CFRSCC Fig. 2 L-Box of CFRSCC 3.2 Mechanical Properties In evaluating the mechanical properties of the concrete mixes, the results of the compressive and flexural strengths are shown in Fig. 3.
Domone, A review of the hardened mechanical properties of self-compacting concrete, Cement and Concrete Composites, 29(1), (2007), 1–12
Elango, Study on mechanical properties of fibre reinforced self-compacting concrete, Materials Today: Proceedings, 45(2), (2021), 3124-3131. doi: 10.1016/j.matpr.2020.12.214
Gonen, Mechanical and fresh properties of fibre reinforced self-compacting lightweight concrete, Scientia Iranica, 22(2), (2015), 313-318
Online since: July 2014
Authors: S. Balasubramanian, K. Manonmani, R.M. Hemalatha
Various types of heat treatment processes are used to change the following properties or conditions of the steel: Improve the toughness, Increase the hardness, Increase the ductility, Improve the machinability, Refine the grain structure, Remove the residual stresses, Improve the wear resistance.
The advantages of laser hardening over the conventional technologies can be summarized as follows · Selective areas can be hardened without affecting the surrounding material and time saving by no heating-up or soaking time is required · Treatment depth is accurately controlled and highly reproducible · Superior hardness, strength, lubrication, wear and fatigue properties can be obtained compared to conventional processes without external quenching
Friedrich Bachmann hardened the torsion spring over 170° and depth 0.2-0.4 mm by two diode lasers, the rest of the component was not affected by the process.
With the new laser beam hardening the quality assurance of several important bottom roller quality factors have been improved.Fig.6 shows the hardness increases with the increase in laser power.The increase in the laser power preheating of the surface just ahead of scanning,which result in more penetration and a width of the trace.
One other factor is that during a stop in the production, the power for the heating is zero while a conventional furnace must be held at the correct temperature during the stop.
The advantages of laser hardening over the conventional technologies can be summarized as follows · Selective areas can be hardened without affecting the surrounding material and time saving by no heating-up or soaking time is required · Treatment depth is accurately controlled and highly reproducible · Superior hardness, strength, lubrication, wear and fatigue properties can be obtained compared to conventional processes without external quenching
Friedrich Bachmann hardened the torsion spring over 170° and depth 0.2-0.4 mm by two diode lasers, the rest of the component was not affected by the process.
With the new laser beam hardening the quality assurance of several important bottom roller quality factors have been improved.Fig.6 shows the hardness increases with the increase in laser power.The increase in the laser power preheating of the surface just ahead of scanning,which result in more penetration and a width of the trace.
One other factor is that during a stop in the production, the power for the heating is zero while a conventional furnace must be held at the correct temperature during the stop.
Online since: September 2018
Authors: Elena Yu. Romanenko, Mikhail A. Trubitsin
Buildings and structures, from the moment of their erection and at all stages of the life cycle (in other words, during operation) affect our safety.
The alternating loads and the influence of external factors help to reducing the load-bearing capacity of these structures.
The state of the reinforced concrete structure is affected by various technical and operational factors.
Decrease in strength of concrete is one of the main factors reducing the load-bearing capacity of reinforced concrete poles [4, 6].
The above signal parameters for the survey of the underground part of the support depend on the physical properties of the ground.
The alternating loads and the influence of external factors help to reducing the load-bearing capacity of these structures.
The state of the reinforced concrete structure is affected by various technical and operational factors.
Decrease in strength of concrete is one of the main factors reducing the load-bearing capacity of reinforced concrete poles [4, 6].
The above signal parameters for the survey of the underground part of the support depend on the physical properties of the ground.
Online since: February 2011
Authors: Xiao Liu, Chang Hu Xiang, Wei Zheng Zhang
The turbulent flow in the near-wall region affects the wall heat transfer dominantly.
Theory of boundary layer shows that the wall heat transfer is affected by turbulent flow in the near-wall region dominantly [5-6].
(10) The value of the factor cD is of different opinions between 0.055 and 0.09.
The physical performance of air is specified according to the thermal physical properties table [10].
Conclusions Some conclusions can be obtained from the work in this paper: (1)The convective heat transfer is affected by the flow in near-wall region dominantly in turbulent flow, so the local turbulent parameters in near-wall region are the key factor for turbulent convective heat transfer
Theory of boundary layer shows that the wall heat transfer is affected by turbulent flow in the near-wall region dominantly [5-6].
(10) The value of the factor cD is of different opinions between 0.055 and 0.09.
The physical performance of air is specified according to the thermal physical properties table [10].
Conclusions Some conclusions can be obtained from the work in this paper: (1)The convective heat transfer is affected by the flow in near-wall region dominantly in turbulent flow, so the local turbulent parameters in near-wall region are the key factor for turbulent convective heat transfer