Search results

Introduction The mechanical fault caused by the damage of rolling bearing counts for a large proportion in rotating mechanical faults.
(2) Where, is a scale stretching factor, and is a time shifting factor;.
(3) Wavelet transform has a unique time-frequency property, which depends on the two continuous variation parameters on the real area, i.e., and.
Among them, time shifting factor only affects the position window in the frequency shift, while the scale stretching factor not only affects the position window in the frequency shift, but also the shape window.
Mechanical Engineering & Automation. 6(2010)123-124

Results help to identify and understand melting and solidification of grains affected at high temperature.
Unfortunately, there are other negative factors as well: deformation and structural changes, sinking of reinforced material in lower density matrix (could be visible in cross-section) [8,9].
SEM and EDS analysis of microstructure shows behaviour of particles affected by temperature.
In interdiffusion zone, Co was changed by Fe because of their similar properties.
This temperature and holding time are very good for connection between matrix and small hardening phase but results in reduction of mechanical properties of W2F2C or W6Fe6C [13] (Fig. 6b).

Recently, research of ferrite materials doped rare-earth ions and their properties have been received much attention.
The essential magnetic properties of the studied samples rely on the distribution of kinds of cations at the tetrahedral and octahedral sites.
The investigation showed some influence on the basic magnetic and electrical properties of ferrite.
Magnetic properties.
It is clearly indicated that Sm3+ has been introduced into the lattice effecting ferrite properties from magnetic response of doped Sm3+ samples.

Even with laser welding, martensite in the heat-affected zone disintegrated and resulted in a softened, heat-affected zone as compared with the base materials.
The tensile strength of a butt weldment was determined by the strength of the heat-affected zone.
The tensile-shear strength of an overlap weldment was determined by not only the strength of the heat-affected zone but also bead shapes such as blow holes, underfill, and the bead width at the faying surface.
The mechanical and metallurgical properties of the laser welds were analysed.
The bead shape such as the width at the faying surface and underfill was a dominant factor in determining the tensile-shear strength of weldments.

Due to its mechanical and thermal properties, besides being easy to process, this type of resin is highlighted in the group of thermosets [1].
This combination has presented a wide potential in the improvement of properties and characteristics of the materials [4].
In the preparation of thermosetting composites, the POSS have been widely studied in obtaining hybrid materials which would be able to support higher temperatures [5], promoting an improvement in the mechanical and surface properties as, for example, polymer hydrophobicity [6].
These were mainly in reference to the addition of POSS to epoxy resin, reaching better mechanical properties such as impact and flexibility resistance, a higher thermoxidative resistance and a significant increase of glass transition temperature of the material [4,7].
Factors as free volume, coefficient of thermal expansion, forces of intermolecular interaction and degrees of freedom of conformation can affect the way polymer chains assume the equilibrium of molecular vibration [18,19].

Chemical composition and mechanical properties are shown in Tables 1 and 2.
Mechanical properties of AISI 4340 Yield stress (MPa) Ultim. stress (MPa) Mod. of Elasticity (GPa) Hard.
In this regime, the critical stress-intensity factor range at failure, DKc, is given by KIe (1 - R), where KIe is the elastic fracture toughness or maximum stress-intensity factor at failure.
With an identical stress intensity factor range, a higher R-ratio results in a higher crack growth rate.
It observed that the FCG affected by different stress ratios.

Four different ram speeds were applied to realize how the shape and position of intermediate section would be affected.
The properties of extrusion products are affected greatly by the way in which the metal flows during the extrusion process.
The metal flow is influenced by several factors such as the size of billet (length and diameter), the temperature of billet and container, the extrusion ratio, ram speed, and the material flow stress.
Qamar et al. [13] demonstrated that optimization of metal flow is crucially important in both design and manufacture as it directly affects extrusion speed on one hand, and mechanical properties and surface finish of the extruded product on the other hand.
The position and size of the intermediate section will be affected by altering the strain rate of extrusion process.

.), and anti-sediment wear properties of dredging machine in dredging vessel has become an important research topic in dredging engineering[1].
The carbon is the main factor affecting the carbides quantity, under normal circumstances, and the higher the carbon content, the higher the number of carbides and wear resistance is increased.
Chromium is the main alloying elements in high chromium cast iron, and content of chromium is the main factors to decide carbide type.
In order to study the impact of different heat treatment parameters on the organization and properties of the wear inserts, alloy E (Shown in Table 1) is taken by heat treatment process experiments.
Influence of Annealing Process on Microstructure and Properties of High Chromium Cast Iron, J.

The alloys with both the shape memory effect and super-magnetostrictive property, making up the deficiencies of low response frequency of conventional shape memory alloy as well as high brittleness and small strain of the super-magnetostrictive material, are an ideal smart driving device material [4-6].
The chemical composition of the parent phase is the “innate” and the most important factors that affect the Ms temperature.
The tiny component changes will cause the sudden changes of the phase transition temperature, thereby affecting the microstructure and the mechanical properties at room temperature.

At the moment carbon fibers produced from several precursors, and the physical and mechanical properties of carbon fibers vary depending on the precursor material and the heat treatment conditions.
Thus, the fiber type affects the nature of the bond at the matrix-fiber interface, and the bond at the interface is one of the main factors determining the mechanical properties of the composite.
However, this information could help the composites developers select the type of carbon fiber for a specific matrix, focusing on its properties.
The main carbon fibers properties are shown in Table 1.
Rabinovitch, On the role of brittle interfacial phases on the mechanical properties of carbon fibre reinforced Al-based matrix composites, Mater.