Search results

Introduction During the normal conditions of casting the primary silicon crystals in hypereutectic AlSi alloys exhibit a coarse form, which has a negative impact on the mechanical and tribological properties and on the ability to machining.
Analysis of Fig. 1 and the data summarized in Table 1 shows that the most coarse-grained structure was obtained for the unmodified alloy, cast to ATD probe (sample 1),in which the average area of the silicon surface reach the value of 4317 μm2, the number of silicon precipitates per one mm2 was 9, and the shape factor amounted only 0.39.
For samples 1-4, in which the solidification has occurred in the standard ATD probe (with use of different variants of cooling), the obtained results of average area, the number of precipitates and the shape factor of silicon crystals, does not show a significant difference.
This indicates that the precipitation of silicon adopt spherical, compact shape, which is known to significantly affect mechanical properties of the AlSi cast alloys.

Introduction During the last decade, the study on inherently conductive polymers such as polyaniline (PANi), polypyrrole (PPy) and polythiophene (PTh) have been increased significantly due to their advantageous morphological and structural properties.
Among them, PPy has captured many attentions due to its unique properties such as simple synthesis route, high conductivity, good environmental stability and exhibits good mechanical properties [1,2].
Molecular size and charge of dopant are the main factors that influence the conductivity [3].
Various factors such as the presence of surfactant, reaction temperature and reaction time affected the conductivity and yield of PPy.

A new test-bed machine, named level tension for interlayer, was developed, and its mechanical composition and work principle were also set forth.
Experimental design In order to study working properties and crack resistance of the sandwich material with horizontal force, research group developed a special test beach which is mainly composed of support structure，plane test-bed, load applying and force measuring device.
Moreover, hotting and baking affect on tensile strength.
These two kinds of factors above have been checked out by tests.
Therefore, by direct shear and pull out test, interlaminar shear properties will be studied with the JHY-A material shear apparatus.

Ocean engineering structures often suffer from ice disaster damages, and the mechanism of interaction between sea ice and ocean structures is complex, the sea ice own properties are also changeful. 
As the nature of sea ice varies in different environment, the mechanical properties of sea ice itself are not easy to determine.
The Failure Mechanism of Sea Ice When we design offshore structures in ice region, we are bound to study the mechanical properties of sea ice.
By the statistics we know the Bohai sea ice main parameters such as spatial distribution and different periods ice thickness, and the physical parameters of the mechanical properties [10].
Model ice properties[R], CRREL Report 96-1.

Minor or major Wear Affecting supporting/ centering functions Unsuitable bearing surface and lubrication condition.
Major Element physical crack Affecting or total loss of lubrication and cooling functions.
Major Oil leakage Affecting the normal operation of the gearbox.
- Improving casting and forging technique to ensure the metallurgical quality and mechanical properties.
In order to avoid the damage of the mechanical or magnetic carbon seal static ring, its surface could be hard Chrome plated and anti-bubbling and anti-coking graphite with excellent heat conduction property could be used as well as the seal case of which the thermal expansion factor is near that of the graphite ring.

This study aims to facilitate angle steel analysis to align more closely with the physical and mechanical applications.
The width-to-thickness ratio is a crucial factor affecting the load-bearing capacity.
βw = section property for single angles about major principal axis, in.
This behavior may be attributed to the influence of β_w and cross-sectional properties.
Summary Study analyzes nine different angle steel sections, considering their properties, the impact of calculation formula parameters, and component length.

O C. 1 Department of Mechanical Engineering, Hwa Hsia Institute of Technology, Taiwan, R.
By way of variety of learning rate to know learning rate’s affect and gets appropriate learning rate.
Via different of adaptation gain it shows adaptation gain’s property and obtains appropriate adaptation gain.
Mp represents plant and ζ is the weighting factor of control voltage correction.
The adaptation gain δii can adjust defuzzification proportional factor Guii in time.

In this article the reaction design, thermodynamics, reaction mechanisms, reactive hot pressing or pressureless reactive sintering, microstructures and mechanical properties will be discussed.
(a) (b) Figure 7 Microstructure and properties of the Al2O3-BN composites.
(a) TEM micrograph of the Al2O3-13BN composite; (b) Mechanical properties.
The mechanical properties are shown in Fig. 7(b).
The micrograph and the mechanical properties are shown in Fig. 8.

It is proposed that LVECP treatment created a new dynamic factor for nucleation so that the number of nuclei increased, which restrained the formation of large primary α-Mg dendrites and created a base to form spherical crystals of primary α-Mg.
It offers numerous merits in physical, mechanical and casting properties, such as high specific strength and stiffness, good castability suitable for high pressure die casting, low density, high damping capacity, good thermal and electric conductivity [1].
Although these studies have been fruitful, they have seldom been concerned with magnesium alloy as affected by low-voltage electropulsing.
It was proved that Ca is an effective element to improve the oxidation resistance and mechanical properties of magnesium alloys [10], so 3 wt.% Ca was added as the oxidation inhibitor.
LVECP treatment created a new dynamic factor for nucleation.

All properties (intrinsic or extrinsic) are homogenous over this material region.
Changing this distribution affects the predictions.
The nf-CAFE model is based on the internal states and predicts the deformed material properties.
A major benefit of this modelling technique is the modelling of the dynamic evolution of the internal states, while still providing accurate final material properties in terms of stress/strain relationships.
A second advantage is the ability of the model to predict the material properties at a micro-scale without the need for the high computational burden that would be imposed by reducing the mesh size of a straightforward macro–micro finite element model.