Search results

Tensile strength and Vickers hardness tests show that the steels with 2% of Si exhibit higher mechanical properties.
The differences caused on the oxidation behaviour and mechanical properties by the modification of the composition of the ferritic powders and the sintering atmosphere used are studied.
The mechanical properties of the materials (Fig. 3) are conditioned by the differences in the porosity and the grain size, and by the solid-solution hardening effect of the Si.
The 434L+2%Si stainless steels could have a decrease somewhat lower on their mechanical properties after oxidation that the 434L steel, but the differences found are not meaningful at all (Fig. 9).
 H2-sintered 434L+2%Si steels have higher mechanical properties than plain 434L steels processed in the same conditions, but they suffer higher mass gains at high temperature

The mechanical properties of PMC are related to the performances and contents of reinforcing fibers and matrix resins, and are largely determined by the integration degree between the interfaces of the fiberglass and the resin.
The interfacial invasiveness and cohesion are some key factors to affect the mechanical properties of phenolic molding compounds [1-3].
Modified fiberglass instead of wood flour can highly enhance the PMC performances with better properties of heat resistance, mechanical strength and dimensional stability, and the product can replace metals used in automotive, mechanical and electrical manufacturing applications [4-7].
Property Standard Volume resistivity GB / T 15662-1995 Surface resistivity GB / T 22042-2008 Impact strength GB / T 18029.8-2008 Electric strength GB / T 1408 Bending strength GB / T 11387-2008 Weight GB / T 1033.1-2008 Fluidity GB / T21060-2007 Heat deformation GB / T 1634.2-2004 Results and discussion 3.1 Surface free energy Fiberglass surface free energy is the major factor to affect its properties such as invasiveness, cohesion and bonding.
The measured properties of these PMC samples are shown in Table 5.

Introduction Duplex stainless steels (DSSs) consisting of a dual structure of austenite + ferrite possess the superior mechanical and corrosion properties, and have been applied to various industrial fields such as petrochemical, power and seawater desalination plants.
Furthermore, numerical simulation of solidification cracking susceptibility was conducted in order to clarify the affecting factors of solidification cracking. 2.
Furthermore, numerical simulation of solidification cracking susceptibility was conducted in order to clarify the affecting factors of solidification cracking.
(3) In order to clarify the affecting factors of solidification cracking, numerical simulation of solidification cracking susceptibility was carried out.
[3] N.A.McPherson, Y.Li and T.N.Baker: "Microstructure and Properties of As Welded Duplex Stainless Steel", Sci. & Technol.

However, the mechanical properties of the viscous materials are between flexibility and viscous between, building models is more difficult, the dissipation of energy is more difficult to estimate.
Nonlinear factors analysis β/κ, q reflect respectively the size of the passive isolation system stiffness, the strength of the nonlinear damping.
Effect of nonlinear stiffness (β/k, η) factors on frequency response Fig.3.
Effect damping factor(fractional operator q)on frequency response Fig.4.Effect of nonlinear stiffness and damping factors on frequency response Summary This paper considered factors of the stiffness vibration isolation system and the nonlinear of damping, established the fractional order nonlinear dynamical equation of the viscoelastic passive vibration isolator; the response equation are derived by the method of harmonic balance frequency, studied the intensity of nonlinear how to affect frequency characteristics; The Floquet theory is used to analyse the stability of the vibration isolator stable periodic solutions, discussed the stability interval of constant periodic solution.
[2] A.H.Chen, D.S.Liu, Y.P.Zhu: Chinese Journal of Mechanical Engineering, ·Vol·37· (2001), No.6, p9-105.

The remnant liquid forms an amorphous grain boundary phase which degrades the mechanical properties of the material at temperatures > 1000°C because of drastic softening of the grain boundary regions. 1.2 β-Si3N4 Si3N4-based materials display a combination of properties that result in superior resistance to wear, thermal shock and mechanical stress.
This will especially enhance the chemical and mechanical properties at elevated temperatures.
Thus the extent to which the above four factors influence thermal behaviour may vary as the stabilizing cation is changed.
Physical properties like high thermal conductivity, low dielectric constant and loss, high electrical breakdown strength, high compressive strength and low thermal expansion co-efficient are the main factors for the versatile applications of AlN ceramics.
Pronounced prismatic cleavage is, therefore possible in this material, which is supposed to influence the ultimate mechanical properties at high pressure [35].

Fiber-reinforced composites can be modified with particles to improve mechanical properties.
Mechanical properties can be modified by the addition of copper particles.
The powder grain size factor affects the adhesion of the powder and epoxy as the reinforcement and also affects the value produced, the smaller the powder size, the stronger the glue will be.
Epoxy resin reinforced copper and silicon particles to investigate the response of particles with respect to mechanical properties such as hardness and impact strength and physical properties such as thermal and electrical conductivity for epoxy resins.
These properties are estimated and compared.

The thermal fatigue properties of the solder joints with various underfills were evaluated by thermal shock test.
It was known that the full curing which has lower curing temperature and a longer curing time of the underfill leads to lower thermal stresses and better physical and mechanical properties.
From these results, it was identified that the properties of underfill affected the thermal fatigue performance of flip chip package.
The factors which were affecting the electrical resistance increase of the package were consisted to be the growth of IMCs, the existence of void in the solder or underfill, and the delamination.
It was indicated that the underfill C, which had the properties of highest Tg and lowest CTE value, had the best resistance to the thermal fatigue failure.

Water uptake and its effect on mechanical properties have been evaluated.
The -NCO groups of PU react further with the hydroxyl groups of starch which enhances the chemical cross linking [7], leading to a change in morphology which affects the mechanical properties.
It can significantly alter some of the properties such as physico-mechanical and electrical properties.
The calculated mechanical properties for water aged samples are given in Table 2.
After water ageing the reduction in mechanical properties of the composites were noticed.

Such degradation is influenced by the response of coatings to environmental factors such as high temperatures and exposure to ultraviolet radiation, as well as chemical factors.
Coating life in the region of these displacement concentrations is likely to be affected by the local strain effects, and the structural loading history may therefore be a factor which needs to be considered in predicting and assessing rates of coating degradation.
Coating Failure Environment Most coating failure studies focus on two critical experimental factors, namely (i) ultraviolet (UV) radiation exposure and (ii) the combined function of heat and moisture (the hydrothermal effect) [4].
In general, both effects cause a series of chain chemical reactions in the polyurethane topcoat, leading inevitably to deterioration in coating mechanical properties; the process can be accelerated by the presence of water and elevated temperature.
The deterioration of a polyurethane topcoat can be measured through its effect on coating appearance and coating mechanical properties (i.e. tensile strength, elongation, impact strength and elastic modulus).

Therefore, the primary practical importance is the ways to regulate the structure and properties of the final product as a result of rational use of the balance of internal forces of the initial disperse system, which is predetermined by the energy factors of interfacial surface layers.
In this connection, at the first stage, the influence of the dispersion of the raw material charge in a ball mill on the physical and mechanical properties of ceramic materials was investigated.
The burning properties of the samples are shown in Fig.1,2.
Based on the results shown in Figures 1 and 2, it can be seen that the properties of calcined ceramic samples are affected by the duration of dispersion of the feedstock, as well as the calcination temperature.
Based on the results shown in Figures 1 and 2, it can be seen that the properties of the crystals are affected by the duration of the dispersion.