Search results

One of the important problems affecting the economic efficiency of the proposed technology is a rational and cost-effective technology of manufacturing the workpiece for the subsequent technological process of rotary forging.
Analysis of the mechanical properties of steel 20 and stainless steel AISI 316 in the temperature range (900-1100)0C shows that the value of the yield strength of stainless steel is almost the same or slightly exceeds the yield strength of steel 20 (up to 10%).
Advances in Mechanical Engineering, Lecture Notes in Mechanical Engineering, Springer International Publishing Switzerland, 2016, p.175-181, DOI 10.1007/978-3-319-29579-4
Modeling of microstructure and mechanical properties of hot rolled steels.
Effect of structure factor on high-temperature ductility of pipe steels.

The results indicate that the micro-crystalline alumina SG abrasive wheel with large specific volume has good grinding properties when grinding Inconel 718 in comparison of the wheels with PA abrasives or SG abrasives of small specific pore volume.
Some important factors, such as the grinding forces and temperature, were investigated, and surface roughness was used to describe the surface quality.
It was strengthened by depositing and deformed at high temperature, which has high strength, high fatigue property, and fine plasticity at the temperature ranging from -325 to 650℃.
The grinding force can affect wheel life, surface roughness and specific energy, which is often regarded as an assessment parameter in grinding process, because it is convenient to be obtained and controled.
Grains of SG abrasive characterize perfect abrasiveness owing to the micro-crystalline structure and isotropy of physic-mechanical properties and also the ability of self-ageing proceeding on a micro scale.

It is noteworthy that between 135°C and 220°C, alloy 2618T6 has superior strength properties compared to 2219T6 whilst, 2219T6 has superior properties beyond temperatures of 220°C.
For both these series of Al alloys, reductions in Fe & Si (except in certain 2xxx series alloys where Si is an alloying element) bring about considerable improvements in mechanical properties.
Tables 12 & 13 represent the mechanical properties and SCC data of 7449 sheets and 7055 extrusions produced at the laboratory scale and subsequently heat treated to peak aged and RRA tempers [20,29,30].
Table 12 Mechanical properties and SCC data of 5 mm thick 7449 sheets Temper 0.2%PS (MPa) UTS (MPa) %EL EC (%IACS) K1SCC (MPa m1/2) T651-L 585-601 625-635 12-13 31.0 <18 T7751-L 565-575 598-602 10-11 36.3 23 Table 13 Tensile properties of 18 mm dia 7055 extrusions Temper 0.2%PS (MPa) UTS (MPa) %El %IACS T6 725 757 13 31.0 T77 (RRA) 683 697 11 36.5 T77 (RRA) 673 685 12 37.0 Influence of Micro and Trace Alloying Elements on the Microstructure and Properties of 7xxx Series Al Alloys Figure 13.
[4] J.E.Hatch, Aluminum: Properties and Physical Metallurgy, ASM, Metals Park, Ohio, 1984

Introduction The mechanical optimization design is one of modern design methods, which is based on the mathematical, a computer as a tool, and to find the optimal design.
It is a novel design approach, which is under the given load or environmental conditions and constraints within the limits of the range of the gears of state, the relationship between the geometry or other factors to select the design variables, establish objective function and then calculate an optimal value through computer programming[1].
The Determination of Design Variables According to equation (1) and (2), there are too many parameters that affect the quality of helical gears transmission.
In order to reduce the computing time and improve computational efficiency, the author need to select some parameters that influence the gear structure and properties more as the design variables.
Mechanical Research & Application, 2009(1):47-48,54 [4] Ying Wang, Sanmin Wang, Jiashun Guo.

Based on the latest research results at home and abroad, combined with the stress and physical properties of subgrade soils in south moist and heat area, the laboratory test method for dynamic rebound modulus of subgrade soil in this area was determined.
Introduction Resilient modulus of subgrade soil is a mechanical parameter of strength, but also the main parameter of the design for the pavement structure.
They are static values [1,2] that difficult to accurately reflect the mechanical response of the repeat dynamically loads of the existing highway embankment.
In fact, the resilient modulus is mainly affected by stress conditions, physical conditions (moisture content and density) and the nature of the composition.
Subgrade soil moisture content is an important factor affects its strength.

In recent years, SF has been processed into various material formats including films, electrospun fibers, three-dimensional porous scaffolds, microspheres and hydrogels for potential biomedical applications due to its impressive biocompatibility, biodegradability, and mechanical properties [3-7].
Using of these factors can effectively solve the problem that the hydrogelation of SF is too slow, such as adding organic solvents or ions, applied ultrasonic vibration [10] or electric fields [11], etc.
The SF hydrogel has therefore been considered as a valuable candidate for biomedical applications, but it is still necessary to improve the preparation of SF hydrogel with excellent or particular structure and properties [12-15].
In order to study the structural and morphological properties, hydrogels were characterized by surface tension, FTIR, X-ray diffraction and SEM analysis.
Structure and properties of silk hydrogels.

This paper compares the results of several neutron diffraction and contour residual stress studies of different materials and analyses the results with respect to the different material properties and the type of phase transformation that occurred.
However in the heat affected zone the initial precipitates would have been dissolved by the heat from the laser and then re-precipitated by natural aging.
Table 1 – Physical and Phase Transformation Properties Melting Point (oC) Martensite Start (oC) Martensite Finish (oC) Elastic Modulus (GPa) Thermal Expansion (μm/m/oC) NAB 1035 500 150 115 16.2 Ti-6Al-4V 1604 994 575 113 8.6 The stress level at which the inflection occurs was found to be different for the two materials and can be attributed to a number of factors.
The particle precipitation state of AA7075 in the clad and heat affected zone affects the d0 spacing and it has been noted that the precipitation process can reduce residual stress through load sharing.
Withers, On the evolution of local matieral properties and residual stress in a three pass SA508 steel weld, Acta Materialia, 60 (2012) 3268-3278.

By combining chitosan and alginate, a hydrogel with enhanced mechanical properties can be obtained.
The presence of a complex structure can enhance the mechanical properties of the hydrogel.
The presence of these functional groups supports the hypothesis that the hydrogel exhibits enhanced interactions due to the synergistic effects of both alginate and chitosan, contributing to its mechanical and swelling properties.
The specific properties and concentration of chitosan used are crucial factors [13].
Michaud, “Structures, Properties and Applications of Alginates.,” Mar.

Ekhuemelo and Tor [9] assessed the fibre of corn husk and reported that its physical properties are comparable with other non-wood plants.
Corn husks were mixed with banana stems and pineapple leaves to produce pulp and their properties were compared with commercial papers.
Various testing were carried out to compare the properties of the papers made from different waste fibres with commercial papers.
Fibre length is an important parameter for pulp properties because the pulp strength is directly proportional to fibre length.
However, some fibres would be damaged by mechanical action in the mechanical pulping process.

Also, since titanium alloys are prone to texture heterogeneity, the microstructural changes can compound the anisotropy of the mechanical properties of the weld.
As the recrystallization kinetics of an LFW joint are affected by the original texture, this aspect must be considered as a component of the final texture at the joint.
The formability and fatigue life, both important in aerospace applications, are strongly affected by the texture anisotropy.
Those that have less pronounced textures appear to represent a mixture of i) unaffected grains and ii) others that have been thermally affected.
Wenk, "Texture and anisotropy: preferred orientations in polycrystals and their effect on materials properties".