Search results

Introduction Closed-cell aluminium foams show alluring potential for different engineering application mostly due to significant energy absorption owing to exceptional combination of light weight with new physical and mechanical properties [1, 2].
The superior properties of aluminium foams offer strong motivation regarding the development of different approaches for their fabrication.
As to the melt processing, several factors control energy absorption of aluminium foams by influencing their plateau stress and strain.
Besides structural factors, such as cell morphology and matrix material of the cell walls being essentially affected by parent alloy composition, it is reasonable to suggest that the mechanism of cell collapse plays an essential role in mechanical performance metrics and energy absorbing ability of foams.
Ashby, Cellular Solids: Structure and Properties, Cambridge: Cambridge University Press, 1997

Effects of Carbon Nanotube Functionalization on the Mechanical Properties of Vinyl Ester Composites Hongyan Chena, Huabo Huangb and Jihui Wang*c School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, China achyrain_2000@163.com, bhuanghuabo2008@126.com, cjhwang@whut.edu.cn Keywords: Carbon nanotubes; Vinyl ester resin; Functionalization; Nanocomposites Abstract.
Introduction Because of the unique structural, mechanical, and electrical properties, since their discovery [1] carbon nanotubes (CNTs) have generated great scientific and technical interests.
Carbon nanotubes in general are regarded as high potential fillers to improve polymers properties.
The major factors affecting the reinforcing efficiency of CNTs are strong interfacial bonding between the CNTs and polymer and appropriate dispersion of CNTs in polymer matrix due to their large specific surface areas (SSA) and inert surface.
We demonstrate that the existence of GMA on MWCNTs can improve the MWCNTs–vinyl ester resin interfacial interaction and thus effectively enhance the mechanical properties of MWCNTs/vinyl ester resin composites.

Metallurgical Mechanisms Controlling Mechanical Properties of Aluminum Alloy 2219 Produced By Electron Beam Freeform Fabrication Marcia S.
Understanding the metallurgical mechanisms controlling mechanical properties is essential to maximizing application of the EBF3 process.
In the current study, mechanical properties and resulting microstructures were examined for aluminum alloy 2219 fabricated over a range of EBF 3 process variables.
In order to maximize application of the EBF 3 process it is essential to understand the metallurgical mechanisms controlling mechanical properties in deposited material.
Tensile properties of as-deposited Figure 3.

Additionally, the residual stress state also affected part size stability and mechanical wear performance.
The experiment of Ghanem [3] showed the change of the cutting parameters can affect the residual stress.
The mechanical and physical properties of GCr15 in the simulation are shown in Table 1.
Table 1 GCr15 mechanical and physical properties Temperature [℃] Thermalconductivity [W/m·℃] Heat capacity Young's modulus [Gpa] Poisson's ratio Coefficient of expansion [10-6/℃] Emissivity 20 52.5 3.4 201 0.277 11.5 0.75 200 47.5 4.1 179 0.269 12.6 400 41.5 4.8 163 0.255 13.7 600 32.5 5.8 103 0.342 13.7 800 26.0 12.0 87 0.369 15.3 1000 29.0 4.5 67 0.490 15.3 This article designed a single factor cutting tests corresponding simulation parameters, the feed rate is f = 0.10mm, ap = 0.2mm, cutting speed is v = 100m/min.
The basic discipline of various factors was concluded through analyzing the results of the workpiece surface residual stress.

The friction force is mainly affected by the relative velocity of two contact objects.
(a) Different motion velocity (b) Different contact condition (c) Different spring stiffness Fig. 3 Deviation of rotation angle with different factors The contact condition is the second factor that needs to be simulated.
Other factors are set as follows: the spring stiffness is 10 N/mm; the moving distance of ball is 1 mm with the velocity 0.1 mm/s.
It shows that the properties of contact surface are not important to the stability of rotation angle.
The simulation was executed to discover the dynamical performance of gripping motion based on three important factors.

One of the factors observed which contributed to change the colorimetric values of the clays was the use of stabilizers like lime, on the other hand, these stabilizers also helped to change the USCS classification of the soils and their cohesive properties.
Regarding this situation, the characterisation concerning vernacular and earthen architecture need to be done to understand the current properties of these materials [7].
About the straw proportion, three of the six adobe samples had none or very small amount of fibres, a situation that is hardly to find in vernacular architecture, since fibres are really useful to reduce the shrinkage and improve the mechanical properties of the earthen masonry bricks. [12] Table 1 USCS Classification of the specimens and their properties.
Vettori, The Influence of Natural Organic Materials on the Properties of Traditional Lime-Based Mortars, in International Journal of Architectural Heritage, (2017), doi:10.1080/15583058.2017.1287978
Çavdar, The effects of the fiber contents on the mechanic properties of the adobes, in Construction and Building Materials (22), (2008), 222-227.

It has been accepted that compositions and microstructures significantly affected dielectric properties of materials.
Such properties can be enhanced through doping and microstructural control.
Dielectric properties, specifically dielectric constant and loss factor, of the sintered samples were evaluated by impedance analyzer (HewlettPackard, 16451B) at the frequency ranging from 1 to 1000 MHz.
Lopez, Mechanical Properties and Phases Derived from TiO2 Nanopowder Inoculation in Low Carbon Steel Matrix, Materials Transactions. 54(10) (2013) 1869-1876
Waser, Electronic properties of grain boundaries in SrTiO3 and BaTiO3 ceramics.

The forces analysis of non-magnetic particles in centrifugal force field It has been found out that the flow pattern in centrifugal force field is more complex and the motion of non-magnetic particles is affected by many factors [5].
Although both Magnus force and saffman force affect the motion of particles, this effect is seen to be small in the centrifugal separation of permanent flow [8,9].
In particular, the settling velocity and the square of particle size have positive correlation, so we can infer that the fine particles are more easily affected by hydrodynamic.
As apparent density and fluid property are two important control parameters, when the imposed magnetic field is moderate and the fluid property is better, the axial separation effect can be improved theoretically.
Therefore, the following work should be carried out by experiment on the grounds of the aforementioned mechanical model.

The results show that hot pressing temperature, pressing time, pressing pressure, veneer glue spread –four factors affect the bond strength of the structure plywood significantly, but the difference among the three veneer glue spread levels is not significantly.
Compared with ordinary plywood, there are many differences including layers and veneer thickness of plywood, in addition to the physical and mechanical properties of products and production processes.
Pressing pressure is one of the main factors, which impact the plywood’s quality, pressure directly affects the compression rate of plywood and wood utilization.
Conclusions (1) Pressing temperature, pressing time, pressing pressure, veneer glue spread –four factors affect the bond strength of the structure plywood significantly, but the difference among the three veneer glue spread levels is not significantly
Measurement the Phtsical-Mechanical Properties of Poplar Lumber by PF Resin Treatment.

Abstract： Stress concentration coefficient of welded joints has a crucial influence on mechanical properties of welded structures.
In order to increase the mechanical properties and using safety of welded structures, it has great significance for reducing stress concentration coefficient and improving the mechanical properties of welded structures by researching and improving the geometry of welded joints .
The calculation results indicate that reducing weld toe inclination angle or increasing transition arc radius can effectively decrease the stress concentration coefficient of welded butt joints, so as to improve the mechanical properties of welded structures.
There are a lot of factors influencing fatigue strength of welded structures, but stress concentration is the most important one.
The influence factors on stress concentration phenomenon of welded butt joint This paper focuses on the main factors, including weld toe inclination angle θ and weld edge transition arc radius r.