Search results

Overall buckling, local buckling, distortion buckling and their interactions, and the use of post-buckling strength of components make the mechanical properties of cold-formed components complicated.
Local Buckling The key components affecting the buckling loads are web and second- flange.
For perforated columns, the size, quantity and spacing of holes are important factors affecting distortional buckling.

Despite the huge number of published studies, there remain big uncertainties about the materials properties.
The problem is strongly nonlinear since each field interacts with others and affects the physical properties of the materials.
In the present study, these factors are taken into account.
Two different core/shell variants (study cases) have been analyzed with properties described in Table 1.
Core/Shell Nanoparticles: Classes, Properties, Synthesis Mechanisms, Characterization, and Applications, Chem.

The temperature field affects the quality of slab directly.
At the same time, the temperature distribution could affect the distribution and magnitude of stress and strain and the production of defects during straightening of the slab.
Li and Thomas [6] constructed thermal-mechanical finite element model of the slab shell.
The property parameters of steel in high temperature change according to the temperature.
For calculating convenience, some unimportant factors are omitted, and assumptions are made as follows: (1) The slab with two meters length is taken into account.

There is a critical particle size to affect the grain growth in the microstructure.
Dispersed finely hard particles are usually used to control the microstructure evolution of materials, and obtain smaller grains, due to their pinning effect on the mobility of grain boundaries to arrest the grain growth, and achieve better mechanical properties through Hall-Petch relation in polycrystalline materials.
Chen etc. [6] has presented a phase field model to study the factor that can reduce particle pinning force significantly in grain growth when the grain boundary is pinned by multiple particles.
The values of 0.3 s for time-steps is chosen to balance the two factors.
It also can be seen form fig. 5 that, there is a critical particle size 1μm to affect the grain growth in microstructure when the particle volume fraction is 10%.

Consequently, safety factors can be defined more in accordance to structural needs, being of highest interest with respect to the increasing number of ageing infrastructure such as highways, bridges or others.
Traditionally, material response to cyclic mechanical loading is characterized by the plastic strain amplitude εa,p, determined in mechanical stress-strain hysteresis measurements [2].
Furthermore materials’ properties determined by these techniques are independent of a defined gauge length and also applicable to complex geometries like notched specimens or even components.
The physical quantities can be transferred from those localized but potentially critical spots and be directly related to microstructural changes in a bulk material of which the fatigue loading properties have been obtained with an approach such as PHYBAL or SteBLife.
Eifler, Fatigue assessment and fatigue life calculation of metals on the basis of mechanical hysteresis, temperature, and resistance Data, MP Materials Testing 51 (2009) 261-68

Reprint of an publication illustrating the mechanical properties of MTA50 steel and the author: professor József Verő (1904-1985).
Mechanical properties of the DE700 type steel plotted against coiling temperature.
Today the up-to-date issue of multiphase steels can be justified by many factors.
Mechanical properties (in relative quantity) of different phases for DP and TRIP steels.
And from that, mechanical properties can also be estimated if the deviations resulting from interaction between texture elements are identified.

One of the key challenges of designing low-cost Unmanned Aircraft Systems (UAS) is to ensure acceptable and certifiable reliability factors for the adopted Commercial-off-the-Shelf (COTS) components since their reliability is often not quantified.
Reliability is a key factor in the certification process to assess the safety of the UA.
The MTFB is given by: MTBF=OperatingTimeFailures (1) The overall reliability of a system is affected by the reliability of its subsystems.
(a) CDF (b) PDF Figure 5: Servomotor CDF and PDF Reliability is one of a number of factors influencing the risk UAS pose to people and property on the ground.
Ramasamy, Navigation and Guidance System Architectures for Small Unmanned Aircraft Applications, International Journal of Mechanical, Industrial Science and Engineering, 8(4), pp. 733-752, WASET. (2014)

The conductivity of the PEMFC membrane is one of the most critical factors in PEM fuel cell designs.
The mechanical and thermal properties were also improved as compared to unmodified Nafion® membranes.
The SPAEK had better mechanical properties than Nafion ® as shown in Fig. 4.
The mechanical properties increased with increasing SPAEK content.
This membrane had better mechanical properties and good water uptake than commercial Nafion® .

Results of the numerical study revealed that the concrete strength and shear span to depth ratio mostly affect the load-deflection response of the beams.
These deficiencies can severely deteriorate the materials mechanical properties and thus, jeopardizing structural integrity and durability of the entire structure.
However, evaluation of the structural performance of structures constructed with the newly introduced SCC is necessary considering the reported differences in its mechanical properties when compared to the VC.
In the second part, numerical simulation was conducted to evaluate various parameters affecting the shear behaviour of reinforced concrete deep beams.
Detail of the beam dimensions is shown in Fig. 3 while the properties of the specimens are detailed in Table 2.

Therefore, it is very important that which factor is mainly causing the reliability deterioration of the solder joints when using different solder composition and metallization combinations.
Electronic industries have relied heavily upon the use of eutectic Sn-Pb solder for surface mount assemblies, because of its good soldering properties, low prices, adequate physical and mechanical properties and good fatigue resistance.
They have superior mechanical properties of strength, elongation, creep and fatigue resistance than Sn-Pb solder.
However, the mechanical property degradation is another reliability concern, so we concentrated on the relation between microstructure and joint strength of the solder joints during the thermal shock testing.
This is mainly caused by mechanical properties of the mere solder itself which is affected by high tin contents and dispersed Ag3Sn IMC particles within the solder region.