Search results

However, polycrystalline silicon is high hardness and brittleness, and tensile stress is much larger than its shear stress, in cutting, polishing and mechanical polishing machining technology process, the silicon material under shear stress and prone to breakage phenomenon, which affected production yield[1].
Therefore, in this paper single diamond particles sawing theory is aplied to study the removal process of polysilicon material, and views the machining of polysilicon materials as the process that single diamond abrasive affects on the surface.
The material in this region will be completely converted to be chips then be cut out, so that withstand pressure loads are the main factors affecting the cutting force, but its value is very small, not enough to form micro-crack.
(4) Withstand pressure loads are the main factors affecting the cutting force, but its value is very small, not enough to form micro-crack
References [1] Li,D.S., Yang, D.R. and Que,D.L., Monocrystalline silicon material mechanical performance research and progress, Materials science and Engineering.2000:100～104

Biodegradable is the ability of a material to be chemically decomposed or degrade into compounds under the influence of biological factors.
Biodegradable implant must be absorbed gradually, maintaining mechanical properties until they are no longer needed and then to be absorbed without leaving remaining compounds in the body [2].
Addition of Ca in a magnesium alloy will lead to grain refining, thereby improving the rate of corrosion and mechanical properties of the alloy [6,7,8].
Mechanical properties and corrosion rate of Mg-Ca alloys are influenced by the calcium content.
Especially the magnesium alloy Mg1Ca alloy showed good results related to the mechanical properties and corrosion rate [9,10,11].

Low back pain is a common musculoskeletal disorder affecting 80% of people at some point in their lives.
MCS, Taddei [7] was found that bone stresses and strains in the proximal femur were more sensitive to uncertainties in the geometric representation than material properties.
An anisotropic material exhibits different mechanical properties when loaded in different direction due to the structure of bone is different in the transverse and the longitudinal directions.
Therefore, this study was conducted on linear isotropic and assume that the whole vertebra considered as cortical bone properties.
Denote by X, is a vector of random variables with components X1, X2, ..., Xn represent the uncertainties in the load, material properties and geometry [13].

However, traditional plasma nitriding is not suitable to be used to improve the mechanical properties of stainless steel due to the obvious reduction of corrosion resistance [[] Y.T.
Moreover, it is well known that element diffusion rate is mainly affected by two factors, temperature and diffusion activation energy.
Vol. 50 (2004), p. 647. ] were exposed to severe plastic deformation by mechanical attrition on surface before nitriding.
The progressively changing microhardness towards sub-surface is favorable to superficial mechanical properties such as loading-carrying ability and bond strength between nitrided layer and substrate.
Thus, nitriding alone improved the FF life by a factor of 43 times and SP+nitriding led to only a five-fold improvement.

Introduction Internal corrosion of in service natural gas gathering pipeline is affected by many factors[1], including natural gas temperament, fittings geometry and flow conditions and other factors, if using experimental methods to study corrosion location , we will face a long study period, high cost and the need to invest a lot of human and material resources and other issues.
CO2 Corrosion Factors [1] There are numerous CO2 corrosion factors, such as temperature, CO2 partial pressure, moisture content and so on.
Flow corrosion is a metal damage phenomenon due to the rapid relative motion between the metal surface and corrosive fluids, it is the result of synergy between electrochemical corrosion which is caused by electrochemical factors, and mechanical erosion, caused by hydrodynamic factors, is also an important reason that damages various pumps, valves, piping and other components in oil, chemicals, water conservancy, hydropower and other industries.
There are many factors that affect corrosion rate, such as the adhesion and density of corrosion product film, FeCO3, and CO2 partial pressure of corrosion medium.
According to analysis of flow characteristics, corrosion properties of the low-speed vortex zone and the actual working conditions, we can predict the location where corrosion may occur on pipe inner wall surface in the area, then test it regularly.

Based on FEM, the three dimensional thermal mechanical coupled model of shell ring rolling process was built in this paper.
The influences of process parameters on the stress field, strain field and mechanical parameters were investigated.
Then, the thermal mechanical simulation of heavy shell ring rolling was made based on explicit dynamic FEM.
The heavy shell ring rolling process is three-dimensional, continuous, gradient, very complex plastic working process affected by many influencing factors.
The key problems such as geometric model building, material property and thermal boundary were solved

Because of the anisotropic property at the level of each grain, texture evolution can introduce a textural hardening effect on the flow stress curve for the polycrystal, which is represented by the so-called Taylor factor, i.e. the sum of the accumulated slip on all slip systems, normalized by an equivalent measure of strain.
In principle, it can also be affected by the evolution of the CRSS on each individual slip system [4].
In other words, the rate variation effect mainly affects the plastic work at each strain increment.
The latter is represented by the Taylor factor and different models would give different Taylor factors with regard to the same texture.
The differently predicted Taylor factor evolution would further on affect the predicted evolution of the average CRSS in the polycrystal.

The results indicate that the presence of gelatin accelerates the setting reaction, and improves the mechanical properties of the cement.
In particular, a number of organic and polymeric additives have been used with the aim to improve the mechanical properties of CPCs [4,5].
The control cement exhibits poor mechanical properties even after setting, as shown by the low value of the compressive strength of the samples aged in SBF at 37°C for 7 days (Table 1).
The data support the hypothesis that porosity is a key factor for the control of the mechanical properties of cements [8,9].
The addition of gelatin to α-TCP based cements can be utilized to modulate the setting properties of the cements, and to improve their mechanical properties.

Also the influence of kinetics and dispersiveness of Nb(C,N) precipitates on a complex of mechanical properties of steel during controlled rolling with accelerated cooling has been investigated.
Fig. 2 shows the schematic representation of dependences of mechanical properties of steel (0.05%C-1.4%Mn-Mo-Nb) from key parameters of TMCP technology.
The required level of mechanical properties of strip, including a uniform level of properties on length of a strip, can be achieved by maintenance of necessary phase structure of steel in a combination with the effective precipitation hardening of strip [1].
As a whole all the sb sb mentioned factors allow to predict the absence of susceptibility to cold cracks formation in HAZ metal at welding.
Products demonstrated the level of mechanical properties not lower than requirements of API X70 Grade.

Keywords: Byzantine walls, spatial variability of earthquake ground motion, angle of incidence of seismic waves, mechanical property Introduction This paper aims to investigate the relation between the dynamic response of a 150m long, irregular in plan Byzantine Walls complex (Fig. 1) located in the city of Thessaloniki in Greece and the direction of propagation of the incoming earthquake motion, taking into account the influence of the spatially variable nature of the incident seismic waves and the inherent uncertaintly of the mechanical properties of the structure.
Mechanical Properties of the Walls The construction materials of the Wall under study vary substantially along both its length and its various sections since the latter consist of alternate layers of stones and external bricks at both facades, filled with rubbles.
In order to obtain a statistical estimate of the variation of material properties, a series of non-destructive tests were performed in situ leading to the assessment of the compressive strength of the (weaker and hence more ctitical) intermediate mortar layer.
Herein, from the above three factors of the asynchronous ground motion, only the first was explicitly taken into consideration.
At the same time for a given, constant angle of seismic waves incidence, the reduction of maximum in time stresses when adopting the softer material properties (i.e.