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Online since: July 2017
Authors: Welf Guntram Drossel, Inaki Navarro y de Sosa, Thomas Mäder, Björn Senf, Peter Wolf, Martin Hamm, Martin Zoch
This changes the laminate structure and their mechanical properties.
In order to investigate the sensing properties as well as the mechanical properties of the plain SMA, the wires itself were tested in the beginning.
Results and discussions Electro-mechanical properties of SMA wires.
Electro-mechanical properties of embedded SMA sensors.
Mechano-electrical and thermo-electrical properties were determined in order to evaluate the sensing value of these SMA.
In order to investigate the sensing properties as well as the mechanical properties of the plain SMA, the wires itself were tested in the beginning.
Results and discussions Electro-mechanical properties of SMA wires.
Electro-mechanical properties of embedded SMA sensors.
Mechano-electrical and thermo-electrical properties were determined in order to evaluate the sensing value of these SMA.
Influence of Magnetized Water on Mechanical Properties and Durability of Recycled Aggregate Concrete
Online since: September 2022
Authors: Mohammad Reza Esfahani, Ali Abdallah Youssef
Three factors may have contributed to this improvement.
The frost resistance of concrete is also affected by its porosity, aggregate properties, and climatic conditions [72-75].
Zhang, Mechanical properties of recycled aggregate concrete under uniaxial loading, Cement and concrete research, vol. 35, no. 6, pp. 1187-1194, 2005
Shynier et al., Improving Some of Mechanical Properties of Concrete by Magnetic Water Technology, Ministry of Science and Technology, 2014
Xie, Mechanical and durability properties of recycled aggregate concrete: effect of recycled aggregate properties and content, Journal of Materials in Civil Engineering, vol. 30, no. 2, p. 04017275, 2018
The frost resistance of concrete is also affected by its porosity, aggregate properties, and climatic conditions [72-75].
Zhang, Mechanical properties of recycled aggregate concrete under uniaxial loading, Cement and concrete research, vol. 35, no. 6, pp. 1187-1194, 2005
Shynier et al., Improving Some of Mechanical Properties of Concrete by Magnetic Water Technology, Ministry of Science and Technology, 2014
Xie, Mechanical and durability properties of recycled aggregate concrete: effect of recycled aggregate properties and content, Journal of Materials in Civil Engineering, vol. 30, no. 2, p. 04017275, 2018
Online since: February 2021
Authors: Evgeniy Shcherban', Sergey Stel'makh, Mukhuma P. Nazhuev, Mikhail Kholodnyak
Studying the Effect of Some Factors on the Stress-Strain Behavior of the Rostov Region Limestones in the Course of their Production and Use
Mikhail G.
The effect of various factors on the strain-stress behavior of local limestones has been investigated.
Their characteristics and the durability of construction materials made of this rock may depend on both technology and operational factors.
It should be especially noted that the Rostov Region limestones have high stress-strain properties.
Kozlov, The influence of rock disturbance on their rheological properties, Notes of the Mining Institute 185 (2010) 31-36
The effect of various factors on the strain-stress behavior of local limestones has been investigated.
Their characteristics and the durability of construction materials made of this rock may depend on both technology and operational factors.
It should be especially noted that the Rostov Region limestones have high stress-strain properties.
Kozlov, The influence of rock disturbance on their rheological properties, Notes of the Mining Institute 185 (2010) 31-36
Online since: May 2017
Authors: Olga A. Lukashuk, Vladimir I. Mironov
This theory follows a traditional line of mechanical sciences and begins by defining a new material property, namely, the “strain-softening phase”.
It is known that the effective control of a material’s properties could be achieved by changing its structure.
Properties of Structural Elements For the purposes of carrying out a qualitative analysis of the softening process we have set reasonably rigid restrictions on the properties of the model specimen’s elements: 1. the elements whose diameters d0 are small in comparison with their lengths l0 are closely packed into a bundle, which models the material’s macroelement, and, while in the process of deformation, contact with (but do not press into) each other; 2. irreversible deformations of bars are negligible (a brittle fracture at the point ( ) in Fig. 1a), with elastic unloading occurring for two parts of a fractured bar, thus forming a microvoid and affecting intact bars by “spreading them without pressing”; 3. the moduli of elasticity Е and coefficients of lateral deformation are identical for every bar; strength properties are determined by the ultimate strength distribution density , defined on the interval [S1, S2] (Fig. 1b shows the uniform distribution density ).
The dependence of CSSD parameters on various factors related to the usage of constructions provides a common methodological database for scientists and practitioners studying their influence on product life.
The structural inhomogeneity determines the material’s synergetic properties and the possibility of equilibrium deformation during the strain-softening phase.
It is known that the effective control of a material’s properties could be achieved by changing its structure.
Properties of Structural Elements For the purposes of carrying out a qualitative analysis of the softening process we have set reasonably rigid restrictions on the properties of the model specimen’s elements: 1. the elements whose diameters d0 are small in comparison with their lengths l0 are closely packed into a bundle, which models the material’s macroelement, and, while in the process of deformation, contact with (but do not press into) each other; 2. irreversible deformations of bars are negligible (a brittle fracture at the point ( ) in Fig. 1a), with elastic unloading occurring for two parts of a fractured bar, thus forming a microvoid and affecting intact bars by “spreading them without pressing”; 3. the moduli of elasticity Е and coefficients of lateral deformation are identical for every bar; strength properties are determined by the ultimate strength distribution density , defined on the interval [S1, S2] (Fig. 1b shows the uniform distribution density ).
The dependence of CSSD parameters on various factors related to the usage of constructions provides a common methodological database for scientists and practitioners studying their influence on product life.
The structural inhomogeneity determines the material’s synergetic properties and the possibility of equilibrium deformation during the strain-softening phase.
Online since: May 2011
Authors: Qi Ge, Ling Sun, Wen Yong Yu
Abstract: Hollow glass fiber with full of repair agent is embedded in concrete to repair components, and one - third point loading experiment is carried out to test the mechanical properties of it.
In order to obtain a better effect of bridge concrete crack self-healing, the crack width is one of the major factors.
Design and fabrication of specimens The test is about the self - healing and the effect of crack width on the self - healing properties. 12 groups (36 pieces) of 100mm × 100mm × 400mm concrete beam specimens are produced.
The specimen is put back into the box to continue conservation for 5 days, test the mechanical properties until healing is curing agent completely.
Experimental research on mechanical properties of self- repairing concrete embedded glass capsules [J].
In order to obtain a better effect of bridge concrete crack self-healing, the crack width is one of the major factors.
Design and fabrication of specimens The test is about the self - healing and the effect of crack width on the self - healing properties. 12 groups (36 pieces) of 100mm × 100mm × 400mm concrete beam specimens are produced.
The specimen is put back into the box to continue conservation for 5 days, test the mechanical properties until healing is curing agent completely.
Experimental research on mechanical properties of self- repairing concrete embedded glass capsules [J].
Online since: July 2013
Authors: Rudolf Kawalla, Friederike Schwarz, Katja Lange, Lutz Krüger, Stephan Reichelt
The aim of this work is to show aspects of ARB and their influence on the mechanical properties for the conventional magnesium alloy AZ31.
Mechanical properties (in RD) of the initial materials and after one ARB pass with varying parameters (ARB process temperature and reduction).
A comparison of mechanical properties before and after ARB is presented in Fig. 6.
After one ARB pass, TRC material achieves nearly the same mechanical properties of TRC&HT but the related bond strength is smaller (0.26).
Fig. 7 summarizes the compressive mechanical properties of TRC&HT depending on ARB passes.
Mechanical properties (in RD) of the initial materials and after one ARB pass with varying parameters (ARB process temperature and reduction).
A comparison of mechanical properties before and after ARB is presented in Fig. 6.
After one ARB pass, TRC material achieves nearly the same mechanical properties of TRC&HT but the related bond strength is smaller (0.26).
Fig. 7 summarizes the compressive mechanical properties of TRC&HT depending on ARB passes.
Online since: April 2013
Authors: T.K. Nandy, R.N. Rao, Srinivasu Gangi Setti
Introduction
Titanium and its alloys are used in aerospace, chemical and biomaterials applications because of their excellent combination of properties such as corrosion resistance, biocompatibility and mechanical properties, etc. [1-3].
Two main factors have been suggested as responsible for the poor tribological properties of titanium alloys [5]: 1.
The ANOVA was used to know the effect of factors on the sliding wear behaviour.
The percentage contribution of β solution treatment temperature is very less as compared to other factors is about 7%.
Budinski, Tribological properties of titanium alloys.
Two main factors have been suggested as responsible for the poor tribological properties of titanium alloys [5]: 1.
The ANOVA was used to know the effect of factors on the sliding wear behaviour.
The percentage contribution of β solution treatment temperature is very less as compared to other factors is about 7%.
Budinski, Tribological properties of titanium alloys.
Online since: January 2022
Authors: Artashes Levoni Petrosyan
However, this option, in comparison with a heat source on a gas boiler, is expensive both in terms of acquisition and in terms of operation, and it is expedient, especially in this case, to improve the thermal-mechanical properties of the external structures of the building and reduce the heat losses arising from them.
Method The purpose of this article is to determine, in the climatic zones of Armenia and in building structures under the influence of various factors, at the optimal thickness and position of the heat-insulating layer in terms of energy-economic indicators, the types of heat source and its energy efficiency indicators and to determine how they will affect the humidity regime of the building when using foam plastic and penoplex as a heat insulator.
The thermal-mechanical properties of the thermal insulation material significantly affect the overall energy characteristics of the building.
This means that in the case of a material with higher thermo-mechanical properties, heat penetration is significantly reduced, which reduces cold loads in different months.
If it is possible to use a material with higher thermal insulation properties as a heat insulator, it is necessary to take into account its wet properties, because, especially in the winter season, condensation appears, for the removal of which it is necessary to spend 3 ... 4% of the usable heat transmitted through the heating system.
Method The purpose of this article is to determine, in the climatic zones of Armenia and in building structures under the influence of various factors, at the optimal thickness and position of the heat-insulating layer in terms of energy-economic indicators, the types of heat source and its energy efficiency indicators and to determine how they will affect the humidity regime of the building when using foam plastic and penoplex as a heat insulator.
The thermal-mechanical properties of the thermal insulation material significantly affect the overall energy characteristics of the building.
This means that in the case of a material with higher thermo-mechanical properties, heat penetration is significantly reduced, which reduces cold loads in different months.
If it is possible to use a material with higher thermal insulation properties as a heat insulator, it is necessary to take into account its wet properties, because, especially in the winter season, condensation appears, for the removal of which it is necessary to spend 3 ... 4% of the usable heat transmitted through the heating system.
Online since: February 2011
Authors: Ming Zhang, Yu Qing Wang, Bo Zhao
Under this condition, the anti-resonance frequency declines more sharply, and the mechanical quality factor increases gradually, but the effective mechanical and electrical coupling coefficient reduces gradually.
With its excellent acoustic properties and physical characteristics of ultrasonic[1,2], the sandwich piezoelectric ultrasonic transducer is used in many areas, such as machining, aerospace, national defense, biomedicine, electronic equipment, etc.
In Fig.4, mechanical quality factor Qm increases with the increase of the front cover length l2.
Simultaneously, the increase of the mechanical quality factor indicates the reduction of work band width of the transducer, which may also be seen from the logarithm characteristic charts.
Under this condition, the anti-resonance frequency declines more sharply, and the mechanical quality factor increases gradually, but the effective mechanical and electrical coupling coefficient reduces gradually.
With its excellent acoustic properties and physical characteristics of ultrasonic[1,2], the sandwich piezoelectric ultrasonic transducer is used in many areas, such as machining, aerospace, national defense, biomedicine, electronic equipment, etc.
In Fig.4, mechanical quality factor Qm increases with the increase of the front cover length l2.
Simultaneously, the increase of the mechanical quality factor indicates the reduction of work band width of the transducer, which may also be seen from the logarithm characteristic charts.
Under this condition, the anti-resonance frequency declines more sharply, and the mechanical quality factor increases gradually, but the effective mechanical and electrical coupling coefficient reduces gradually.
Online since: November 2014
Authors: Aidah Jumahat, Nurhidayah R. Zamani, Rosnadiah Bahsan
Epoxy resin is one of the most important polymers due to its outstanding mechanical, thermal and also electrical properties [1].
Dynamic mechanical analysis has become more popular because of their significant properties and to provide information about materials such as viscoelastic properties in particular polymers.
Agglomeration of nanoparticles (usually in micrometer size clumps) often gives bad effects on the thermal and mechanical properties of the epoxy resin.
Dynamic mechanical analyzer was used to analyze dynamic mechanical properties of the epoxy resin with temperature range of room temperature to 180°C.
Shervin, The effect of nanosilica on mechanical, thermal and morphological properties of epoxy coating, Progress in organic coating, 75 (2012) 543-48
Dynamic mechanical analysis has become more popular because of their significant properties and to provide information about materials such as viscoelastic properties in particular polymers.
Agglomeration of nanoparticles (usually in micrometer size clumps) often gives bad effects on the thermal and mechanical properties of the epoxy resin.
Dynamic mechanical analyzer was used to analyze dynamic mechanical properties of the epoxy resin with temperature range of room temperature to 180°C.
Shervin, The effect of nanosilica on mechanical, thermal and morphological properties of epoxy coating, Progress in organic coating, 75 (2012) 543-48