Search results

Sangkuriang, Bandung 40135, Indonesia anovrita13@gmail.com, bdediamada1@gmail.com, c*azwar@ui.ac.id Keywords: Cobalt ferrite, crystallite structures, magnetic properties, mechanical alloying, sintering temperatures.
Among of spinel ferrites, CoFe2O4 is the most interesting to be explored because it has wide potential applications and good magnetic properties like high saturation magnetization value, high coercivity, strong anisotropy, chemically stable, and good mechanical properties [3].
The paper will provide information on the effect of sintering temperature on structural changes and magnetic properties of CoFe2O4 during the mechanical alloying process.
The magnetic properties were evaluated by a Permagraph (MAGNET-PHYSIK Dr.
The comparative of magnetic properties of CoFe2O4 under different conditions [19] Synthesis method and sintering condition Mean diameter D (nm) Remanence 𝑀r (emu/g) Magnetization at Maximum Field 𝑀s (emu/g) Remanence ratio R = 𝑀r/𝑀s Coercivity Hc (kOe) - Solid state (1200 °C, 8h) 380 13 78 0.16 0.32 - Citrate gel (300 °C, 2h) 24 26 66 0.39 1.38 - Polymer complex 32 30 67 0.45 1.63 - Mechanical alloying (1000 °C, 2h), This work 58 36 74 0.49 1.65 Conclusions The sintering temperature affects the microstructures and magnetic properties of CoFe2O4 during the preparation through the mechanical alloying process.

The selection of the intermediate layer bases on such factors as bonding requirements, wear mode, contact type, and friction system during production operation.
The chemical composition and mechanical properties are shown in Table 1 and Table 2, respectively.
At the same me, the material has higher comprehensive mechanical properties, namely, it has higher strength, higher toughness, higher plasticity and higher hardness.
Graphite belongs to the mixed crystal, which not only has the properties of crystal, but also has the properties of molecular crystal.
Study on environmental tribological properties and electrochemical corrosion properties of diamond-like films [D].Southwest University, 2014

Changes of mechanical properties and chemical structure of polyester (PET) fibers are studied through UV simulated accelerated ageing experiments with N2, air and O3 as the atmosphere.
Especially the polymer fiber of spacecraft served in high-altitude environment, such as the capsule body materials of airship in the stratosphere, the high-energy ultraviolet radiation and the aging effects of ozone in their working environment affect their service life seriously, but also increases the work risk factors[4-7].
In this paper, changes in mechanical properties and chemical structures were discussed in N2, O3 and air atmospheres.
The decline in mechanical properties of polyester fiber shows that fracture occurs in some molecular chains under UV irradiation in three different atmospheres.
When the gaps and cracks and other defects on the fibers surface increase, its mechanical properties, thermal properties and crystallization will all be influenced.

Its mechanical properties are so complex that microscopic structure study is often used to reveal the essence of deformation and damage.
The mechanical properties are studied by the numerical simulation of biaxial compression test.
According to the researchers home and abroad, the mechanical properties of the talus deposits are extremely complex since they are affected by the material composition, structure distribution, rock content, particle size, arrangement style, etc.
The microstructure should be studied to reveal the essential characteristics and laws of the mechanical properties.
Particle flow modeling mechanical properties of soil and rock mixtures based on digital image [J].

This was to ensure the fracture toughness of the weld was measured, with minimal affect of the surrounding base metal properties.
For each heat treatment condition, microhardness traverses were performed across the mid thickness joint to determine the affect of heat treat temperature on hardness properties, which can provide insight into the resulting mechanical properties of the joints.
Tensile Properties.
Lienert, 2007, "Microstructure and Mechanical Properties of Friction Stir Welded Titanium Alloys," Friction Stir Welding and Processing, ASM International, Materials Park, OH, Ch. 7, pp. 123-154
Hirano, 2008, "Microstructural characteristics and mechanical properties of Ti-6Al-4V friction stir welds," Materials Science and Engineering A, Vol. 485, pp. 448-455

Estimated of loadings factors and common degrees were shown in Table 4.
The loads of them on the main factor F1 were all greater than 0.9, which represent the affecting factors of PCM, besides the variance contribution rate of the main factor F1 to xi was 49.1%, which showed the temperature do great effect on PCM.
In summary, it is showed from the factor analysis model that there were five indexes of the factors affecting the PCM’s strength, including Admixtures, Gray sand ratio, CaO, 28d Strength, and Temperature, whose descending order was Admixture>Gray sand ratio>CaO>28d Atrength>Temperature.
(2) C-S-H gel microscopic analysis C-S-H gel is the most important part in the phosphorus gypsum consolidation , is the most main contributors to consolidation strength.Its formation is affected by various factors,and its properties also have a very important role to the phosphorus gypsum consolidation body structure [6].
Testing on micro mechanical properties of C-S-H gel based on nano-indentation techniques[J].

Abstract: The purpose of this paper is to study some of the factors that affect the shear strength of Single Lap Joints (SLJ).
In the design of the adhesive joints for engineering structures, strength, stiffness and life are considered to be the most important mechanical properties.
While some adhesives can be used up to 260ºC, elevated temperatures are usually a cause for concern; (c) High-strength adhesives are often brittle (poor impact properties).
The purpose of this work is to present a study about the influence of several factors of the bonded joints process in its shear resistance, focusing on temperature effect in mechanical resistance.
Material and Methods Specimen geometry and material properties The SLJs were manufactured with an epoxy resin combined with ceramic particles adhesive (ARC 858).

Microstructure, microhardness and wear properties of the coating are characterized by optional microscope(OM), scan electron microscopy(SEM), X-ray diffraction (XRD) and HV-1000 microhardness tester and the effect of different laser powers(1.2kW, 1.6kW, 2.0kW) on the three factors was studied.
Introduction Titanium alloys are characterized by low density, high specific strength, exceptional corrosion resistance and high temperature mechanical properties which are attractive for a wide range of applications in aerospace, chemical and marine industries etc.[1-3].
Due to the failure of most of the titanium alloy parts often appear in the material surface, so without affecting the original excellent properties of titanium alloy to choose an appropriate surface modification technology can greatly improve the utilization rate of titanium alloy [4-5].
Studies have shown that the influencing factors on the quality of the coating are laser power, laser scanning speed, spot size, defocusing distance and preset thickness, etc.
On this paper, the effect of different laser powers on microstructure, microhardness and wear resistance properties of CBN coating was researched.

Introduction Renovation of the operational properties of resource-worn parts of the car is the main parameter of restoration.
The purpose of this article is to study the problems of resource-worn parts of the gas distribution mechanism of automotive equipment under the influence of factors from a scientific, technical and economic point of view, which make it possible to determine the efficiency and durability of engine parts based on a renovation approach.
Surfacing changes the structure of the metal, which may have a negative impact on its physicomechanical properties.
Improving the operational properties of the car by renovating resource-worn parts is an important task both from a scientific and technical point of view and from an economic point of view.
Shveyova, High Level Forming of Properties in Steel Products.

Problems Determining of the Mechanical Properties of Metallic Materials from the Tensile Test in the Aspect of Numerical Calculations of the Technological Processes Leszek Malag1, a, Leon Kukielka1, b, Krzysztof Kukielka1, c, Agnieszka Kulakowska1, d, Lukasz Bohdal1, e and Radoslaw Patyk1, f 1Faculty of Mechanical Engineering, Koszalin University of Technology, Poland amalagleszek@o2.pl, bleon.kukielka@tu.koszalin.pl, ckrzysztof.kukielka@tu.koszalin.pl, dagnieszka.kulakowska@tu.koszalin.pl, elukasz.bohdal@tu.koszalin.pl, fradoslaw.patyk@tu.koszalin.pl Keywords: Mechanical property, Tensile testing, FEM, Curve true stress-true strain, Material model parameters, Three-dimensional state of stress and strain.
The procedure to determine basic mechanical materials properties from the tensile test is specified for example in standards ASTM [7].
The basic mechanical properties of the investigated steel are also determined.
Increased accuracy determines mechanical properties of the material due to the fact that it does not require knowledge of the curvature radius of the neck contour R, and that for each incremental step solves the equations of equilibrium of the specimen.
Kukiełka, Modelling of the thermodynamic properties of materials metallic in aspect accuracy calculations of main force burnishing.