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Online since: April 2024
Authors: Taha Ben Dhia, Amara Loulizi, Bernhard Hofko, Ahmed Amine Kammoun
These properties are highly affected by the phenomenon of ageing.
The shift factors were modeled using the WLF equation as shown in Fig. 4 and the fit is almost perfect with an RMSE of only 0.0118.
Shift factors for the 35-50 unaged asphalt Table 2.
Ferry, Mechanical properties of substances of high molecular weight in amorphous polymers and other glass-forming liquids, Journal of American Chemical Society, 77(19), (1995), 3701-3707
Isacsson, Influence of commercial waxes on bitumen aging properties.
Online since: January 2017
Authors: Jin Jian Zhang, Shao Ming Tang, Mao Wei Niu, Cheng Huang, Peng Lai Zhu
Through screening the chips effectively, processing, being made into artificial sand, due to the formation of factors, usually the edges and corners of chips produced are obvious, fineness modulus is larger, stone powder content is higher and regional difference exists [2,3].
Basic properties of cement are shown in Table 1 .Tests of raw materials of chemical compositions are shown in Table 2.
(3) The shrinkage and deformation properties of concrete at different ages were tested by contact method.
Results of concrete synergist effects on the properties of chip concrete impermeability are shown in table 8.
Properties of low binder ultra-high performance cementitious composites: Comparison of nanosilica and microsilica.Vol.102(2016)No.1,p706.
Online since: February 2018
Authors: Inese Ziemele, Inese Šroma, Annija Kakarāne
Physical comfort in a sportswear style and the factors influencing it were determined first by determining the typical movements of an athlete in the tested sportswear style.
Consequently, the physiological comfort will depend on the above factors [1].
Fig. 1 shows the interaction between physical and physiological factors that affect the physical and physiological comfort of a person.
To provide psychophysiological comfort throughout the training the fabrics chosen for sportswear, especially for professional sports clothing, should be fast-drying and with good thermal and moisture vapour transmission properties, namely, the fabrics and their layers should be “breathable”.
Than the determination of physical, mechanical properties of fabrics and their layers in accordance with standardized methods are performed.
Online since: June 2013
Authors: Carla Gambaro, Chiara Mandolfino, Enrico Lertora
The 2XXX and 7XXX alloys series, for example, are defined non-weldable because they form brittle chemical compounds in the heat affected zone and are characterized by high porosity in the weld metal; these characteristics give the joint mechanical properties significantly lower than those of the base material [1, 2].
The mechanical properties of this material are given in Table 1.
If necessary, an aging heat treatment could be envisaged, in order to restore the mechanical properties of the heat affected zones.
[9] Missori S., Sili A., Mechanical and microstructural properties of AA8090 Al-Li alloy welded joints, Metallurgical Science and Technology, pp. 22-26, (2002)
[17] Mashiri FR., Zhao XL., Grundy P., Stress concentration factors and fatigue behavior of welded thin-walled CHS-SHS T-joints in-plane bending.
Online since: February 2016
Authors: János Kundrák, Gergely Szabó, Angelos P. Markopoulos
Surface integrity, comprising of surface roughness, material microstructure transformations and residual stresses considerations, plays an important role not only on the surface quality of the machined workpiece [2-5] but also on the properties and the life-cycle of the component and the assembly that incorporates it, an example being fatigue life [6].
Residual stresses character, i.e. they are either tensile or compressive, magnitude and extend within a workpiece depend on many variables; cutting conditions, material properties and cutting tool characteristics are commonly analyzed in the relevant literature.
They concluded that depth of cut does not affect residual stresses.
On the other hand, rake angle variation significantly affects residual stresses.
Demircioglu, The factors affecting surface roughness measurements of the machined flat and spherical surface structures - The geometry and the precision of the surface, Measurement 44 (2011) 1986 – 1999
Online since: March 2013
Authors: Andrzej Gronczewski
Considerable aerodynamic loads that affect the high-lift devices make them being most often operated hydraulically (via hydraulic circuits).
The balance of fluid flow rates: (1) (2) The balance of motion of the hydraulic cylinder driving unit: (3) where: – flow intensity caused by external leaks, – liquid-holding capacity of the cylinder, – flow intensity caused by the compression of the hydraulic fluid, – flow intensity caused by internal leaks, B – coefficient of friction, m – weight of the driving unit referred to the piston rod axis, y – linear displacement of the piton, PS = y – force applied to the piston rod, Nkl – wing-flap affecting load factor.
of hydraulic circuit; KV – volumetric loss factor; m – mass of a driven unit as referred to the actuator’s piston-rod axis; NKL – wing-flap load factor; p0 – working pressure; T1, T2, T3 – constants of hydraulic circuit; α– flow ratio, V1 – volume of the actuator’s piston, EC – bulk modulus of elasticity of the fluid, l - flow-rate distribution coefficient.
Improper functioning of the hydraulic circuit can result from some increase in friction force, the main reasons for which being as follows: contaminants in working fluid; operating the hydraulic circuit with fluid of physical properties other than required; faults in the actuator manufacturing technology (e.g. increased roughness of the hydraulic-cylinder bearing surface); improper servicing (resulting in, e.g. actuator’s piston-rod corrosion); others.
It results from the fact that aerodynamic load affecting actuators increases as the flaps get extened.
Online since: January 2012
Authors: Yan Ni Wang, Xin Lu, Xiao Lin Jiang
Surface Coating Technology and Surface Modification Technology can improve the anti-erosion of artillery bore, abrasion resistance and other properties.
So metal particles jet to the substrate surface at very high speed and cool rapidly to form a coating with excellent mechanical properties [4] [5].
After analysis and comparison, the suitable material and process parameters are selected based on modification properties of material.
The major factors that affect the ability are steel composition, microstructure, properties, and also closely related with the use of conditions and the tensile property.
Mechanical Staff College.
Online since: August 2018
Authors: Veronika Păltânea, Veronica Manescu Paltanea, Doina Elena Gavrila, Horia Gavrila
A transformer is considered usually an electromagnetic device that is subjected to several stress factors, which are due to dielectric, thermal and electrodynamic conditions.
Usually it is necessary an annealing treatment, to have again the high quality magnetic properties [5].
The material properties and the geometrical dimensions of the tested materials are presented in Table 1: Table 1 Properties and geometrical dimensions of the investigated samples.
Scutaru, The effect of mechanical and electrical discharge cutting technologies on the magnetic properties of non-oriented silicon iron steels, Rev.
Scardi, Laser and mechanical cutting effects on the cut-edge properties of steel S355N, JCSR 133 (2017) 181-191
Online since: February 2022
Authors: Khaled Al-Farhany, Alaa Liaq Hashem, Hyder Hasan Balla
The results are specifically interested in mechanical properties, and few of those are interested in thermal properties such as conductivity and thermal resistance of concrete.
The crumb granule properties are summarized in Table 1.
At the inner surface of the block, again, the above-mentioned factors reduce thermal diffusion and increase thermal resistance as shown in Fig. 7.
Wang, An experimental study on mechanical and thermal insulation properties of rubberized concrete including its microstructure, J.
Que´neudec, Physico-mechanical properties and water absorption of cement composite containing shredded rubber wastes, J.
Online since: December 2010
Authors: Shan Suo Zheng, Lei Li, Pi Ji Hou
According to the mechanical characteristics of the SRHPC members, the structural section can be divided into different zones, and the element suitable for each zone is determined.
Introduction Steel reinforced high performance concrete (SRHPC) structure is one mainly form of steel-concrete composite structure, as a mature numerical calculation method, finite element method is powerful and common analysis tool for studying SRHPC structure mechanical property.This paper will combine with the charactors of ANSYS10.0 software to explain the theory and technology problems met in nonlinear finite element analysis for SRHPC structure.
The constraints degree of low constraints zone is influenced by other factors, for example layout of vertical bars, section forms of members and load types.
This method can save calculation time without affecting the calculation premise and make the finite simulation realized successful.
At present, ANSYS10.0 software can not reflect the property of concrete passive lateral pressure effect yet, so the mechanics property differences of core concrete in zone constrained by steel and hoop and cover concrete should be reflected by corresponding stress-strain relation.
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