Search results

The effect of equal channel angular pressing (ECAP) on the structure and mechanical properties of Al-4% Mg-1.5% Mn-0.4% Zr and Al-4% Mg-1.5% Mn-0.4% Zr-0.4% Sc alloys in the initial as-cast state was studied.
Scandium addition to aluminum alloys, in particular Al-Mg ones, causes significant changes in their structure and properties [10-17].
The purpose of this work was to elucidate whether the presence of Sc is important in an Al-MgMn-Zr with regard to structure and properties of ECAP processed alloys.
To that end, we have studied the structure and properties of the cast Al-Mg-Mn-Zr and Al-Mg-Mn-Zr-Sc alloys after the equal-channel angular pressing (ECAP).
Dobatkina: Advanced Aluminium Alloys Containing Scandium: Structure and Properties (Gordon and Breach Science Publishers, Amsterdam, The Netherlands 1998)

In this paper, the phase stability and thermal-physical properties of 1mol.
Modern state-of-art aviation TBCs are usually of about 6-8wt% (3.5-4.5 mol%)Y2O3–stabilized ZrO2 (YSZ) which shows the best phase stability and mechanical property [3-6].
Among these multiple oxide systems, La2O3-Y2O3-ZrO2 (LaYSZ) has been considered as one of the most promising one, owing to its satisfactory properties, including high phase stability, sintering resistance and low thermal conductivity[9].
The mole fraction of monoclinic phase Mm, tetragonal phase Mt/t′ and cubic phase Mc were determined from the common equation (1) and (2)[9]: Mm/Mc,t/t′ =0.82[ Im(11) +Im(111)]/Ic, t/t′(111) (1) Mc/Mt/t′ =0.88Ic(400)/[ I t/t′(400) +I t/t′(004)] (2) Thermal properties.
The atomic mass is another factor affecting the thermal conductivity[14].

Researchers are concerned about thermal comfort in outside conditions, as it is one of the most important factors for those who work in these conditions.
To obtain a binary eutectic, organic and inorganic PCMs are mixed in various combinations for acquiring optimum properties [9].
GO has comparable properties to graphene, and it can be synthesized easily.
Fig. 3 FTIR spectrum of GO The XRD analysis was employed to examine the crystalline properties of the as-synthesized GO.
Thermo-physical properties of paraffin-based composite phase change materials filled with carbon nanotubes.

The mechanical properties of an SLMed metallic part can be comparable to its wrought counterpart.
However, defects in the as-built parts such as porosities, balling, cracks, and rough surface, are detrimental to the final mechanical properties of SLMed part [5].
However, these defects have little effect on the properties of a grinding wheel.
Study on formability, mechanical property and finite element modeling of 3D-printed composite for metal-bonded diamond grinding wheel application.
The effect of porosity on the mechanical property of metal-bonded diamond grinding wheel fabricated by selective laser melting (SLM).

Poly (ethylene glycol) PEG hydrogel has been used as a carrier matrix for the delivery of cell adhesive peptides [74, 75] and growth factors due to its biocompatibility, biodegradability and tissue-like conformational properties [76, 77].
Black: Handbook of Biomaterial properties, In: Hasting G, editor.
Surface properties influencing biological adhesion.
Thiel et al.: Antibacterial properties of silver-doped titania, Small 3(5) (2007) p.799-803
Zioupos: Mechanical properties and the hierarchical structure of bone, Med Eng Phys 20(2) (1998) p.92-102

The influence of oxygen pressure on the properties of Al2O3-SiO2 films is important because of the collision of oxygen molecules and vapor species result scattering phenomenon.
Furthermore, the growth behavior and properties of Al2O3-SiO2 films are affected because of oxygen pressure.
In this study, the Al2O3-SiO2 film is prepared by E-beam evaporation under oxygen pressures ranging from 1×10-5 to 1×10-3 Torr, and the structure and properties of the Al2O3-SiO2 films are investigated as a function of oxygen pressure.
Optical and mechanical properties of Al2O3-SiO2 films.
The influence of the oxygen pressures on the hardness of Al2O3-SiO2 films was shown in Fig. 5 which reveals that the apparent hardness of PET could be increased from 2.77 GPa to about 5.7-6.1 GPa with a factor of 2.1-2.2 depending on the O2 pressure.

Proposal of Methodology for Verification of Stress Distribution in Bolted Joints by Optical Method František Trebuňa1,a, Miroslav Pástor1,b*, Peter Frankovský2,c, Ján Kostka1,d and Ľubomír Gabáni3,e 1Technical University of Košice, Faculty of Mechanical Engineering, Department of Applied mechanics and Mechanical Engineering, Letná 9, 042 00 Košice, Slovakia 2Technical University of Košice, Faculty of Mechanical Engineering, Department of Mechatronics, Letná 9, 042 00 Košice, Slovakia 3U.S.
In the case of bolt-nut connectors are the most significant areas affected by notches the following locations: § area I – located under head of bolt - transmission from cylindrical part of bolt to the head (failure rate is approximately 10%), § area II – the first thread near cylindrical body of bolt- run out of thread (failure rate is approximately 28%), § area III –thread (failure rate is approximately 2%), § area IV – the first thread of bolt in nut- thread of bolt in location of the first carrying thread of nut (failure rate is approximately 60%) [1].
The stress concentration coefficient for the thread part of bolt depends on mechanical properties of thread, technology of production, surface quality, shape of thread profile, on the type and high of nuts.
As the results of numerical modelling depend on several factors, the stress analysis was verified by experimental measurement by transmission photoelasticimetry.
Acknowledgement This paper was supported by project VEGA 1/0937/12 "Development of nontraditional experimental methods for mechanical and mechatronics systems", project VEGA 1/0393/14 and by project APVV-0091-11 “The use of methods of experimental and numerical modelling for the increase of competitiveness and innovation of mechanical and mechatronic systems”.

In cold forging processes, diamond-like carbon (DLC) coatings have become established as a wear protection for forging dies, featuring high hardness and advantageous friction properties.
Introduction The economic efficiency of forging processes depends on various factors.
According to Wang et. al, a modification of the treatment atmosphere can affect wear-reducing properties such as high hardness.
This is attributed to an increased nitrogen content affecting the formation of nitrides.
Behrens, Adapted surface properties of hot forging tools using plasma technology for an effective wear reduction, Wear 330-331 (2015) 429-438

Peng et al. [31] studied the factors that influence the stability of nanofluids.
The test results showed that the most important factors affecting the stability of suspensions were the nanoparticles concentration, dispersant, viscosity of base liquid and pH value.
There are numerous factors such as heater or channel surface conditions (smooth or rough), heater size, shape, material, diameter and orientation, degree of surface wetting, sub cooling, inclusion of surfactants, and properties of liquid affecting heat transfer performance and bubble dynamics of pool and flow boiling [89 - 91].
The pool boiling is affected by the surface properties such as surface roughness, surface wettability, and surface contamination.
Yu, Influence factors on suspension stability of nanofluids, J.

Magnetic method is unsuitable in the application areas where particles properties could not be altered while DEP method is suitable only for particle manipulation at micro-scale and low throughput.
The two non-dimensional factors are given by f1=1-ρfcf2ρpcp2 and f2=2ρp-ρf2ρp-ρf.
It can be seen that at 10 Vpp the trapping factor is less than 60% except the value at 0.1 mL/min.
At 20 Vpp, the trapping factors at all flow rates are greater than 60%.
At 30 Vpp, the trapping factors at all flow rates are approximately 90%.