Search results

., owing to its unique properties such as high oxidation resistance, corrosion resistance even at very high temperatures and retains a high mechanical strength under these conditions as well.
In machining Inconel718, the cutting speed vc is the main reason that affected the tool life.
All these factors resulted in the cutting property of tool declined.
Jiang: Chinese Mechanical Engineering .Vol. 20 (2009), p. 763 [4] A.

But until to now, most theories of them are based on phenomenological method, and they cannot interpret the seepage traits and the variation properties induced by environment changing essentially.
At last, an instance was calculated with this model for its permeability coefficient and critical hydraulic gradient, and at the end the calculation results were discussed. 1 Introduction There are large numbers of pour and fissures with different property and forms in solid mediums like rock and soil, and theirs disorder distribution have great effect on rock and soil’s physical and mechanical character, and in most situation this would go against to rock and soil structure’s stability.
WU Chang-Lu associated macroscopic properties or rock with its microstructure and put forward a fractal capillary model for predicting permeability of porous medium according to fractal geometry. 2 Building of capillary tube model To the building of capillary tube model a hypothesis shall be made.
The main conclusion as: (1) Seepage factors were calculated using this model, unfortunately the result not in the anticipated range.
But this model express the combined relationship of factors which affect the permeability feature of rock and soil mass correctly

Gamma-titanium aluminides present an attractive combination of low density, high melting temperature, good oxidation and burn resistance, high modulus and strength retention at elevated temperatures, and good creep properties.
The properties of γ-TiAl consist of low density (approximately half that of Ni superalloys), high stiffness, high refractoriness and high temperature strength.
The chemical composition of the alloy is listed in Table 1, while the main properties at room temperature are reported in Table 2.
Element % weight Aluminum 32.0 - 33.5 Niobium 4.5 - 5.1 Chromium 2.2 - 2.6 Oxygen Max 0.08 Nitrogen Max 0.02 Carbon Max 0.015 Iron Max 0.04 Hydrogen Max 0.001 All others Max 0.05 Titanium Balance (Max 60%) Table 2: Mechanical properties of γ-TiAl alloy (at room temperature).
(7) Fig. 8 depicts the plot of factor effect on HV30.

Surgical strategies that have evolved to deal with tissue loss include organ transplantation from one individual to another, tissue transfer from a healthy site to an affected site in the same individual, and replace- ment of tissue function with mechanical devices.
As a biomaterial, ploy(lactic acid) (PLA) possesses good chemical and biological properties, such as good biocompatibility, bioresorbability, which offer PLA many biomedical and biotechnological applications[7].
Key factors seem to be its ability to bond bone minerals directly and to promote new bone formation by osteoconduction [9,10].
At the same time, we discussed the mechanism by which the different preparing conditions affected the performances of microsphere- based tissue engineered scaffolds.
PLA scaffolds with 0.3g β-tricalcium phosphate Mechanical properties.

The threshold shear strain is a fundamental property of the soil behavior subjected to cyclic loading.
Accordingly, the objectives of this paper are: (1) Construct small-strain dynamic dissipation function for Ramberg-Osgood model based thermodynamic approach; (2) Propose the first threshold shear strain and the second threshold shear strain respectively and explain small-strain dynamic characteristics under different cyclic loading amplitude; (3) Discuss the magnitude of the threshold shear strain and the factors affecting it thoroughly and systematically for many soils; (4) Indicate that the second threshold shear strain presented in this study is consistent with that of pore water increasing and volume changing in the traditional sense by comparison between the threshold shear strain values and shear modulus reduction.
Non-linear yield surface indicates that there exist other influencing factors in addition to friction mechanism.
Yield curves with =5×10-4 Influencing factors of the two threshold shear strains According to the proposed criteria[10], the first and the second threshold shear strain values of four kinds of dam materials are calculated, as listed in Table 2.
Therefore, the coefficient and the exponent of the maximum dynamic shear modulus are main factors, with two threshold shear strains decreasing with increasing coefficient and exponent.

For FEA a planar anisotropic material model based on the Hill’s 1948 criterion [4] was used for the description of the flow properties of HC220Y+ZE in consideration of the r-values.
Furthermore, the anisotropic hyper-elastic material properties of the fibers are dominant and proved by the numerical calculation.
As opposed to that, in transversal fiber direction the isotropic elastic-plastic material properties of thermoplastic PA6 are dominant during the forming process.
This is due to the totally different material properties of each hybrid part component which have to be considered during the forming process.
With this approach anisotropic hyper-elastic and isotropic elastic-plastic properties of UD-FRP are modelled simultaneously.

The abundantly available oil palm wastes are considered as one of the potential raw materials in producing biodiesel and biochar with desired fuel properties.
The biochar showed improvement of physical properties.
Combustion properties of biodiesel mixture Figure 4 depicts the impact of increasing the global equivalence ratio on NOX emissions for baseline biodiesel and biodiesel mixture.
Park, Co-processing of oil palm waste and waste oil via microwave co-torrefaction: a waste reduction approach for producing solid fuel product with improved properties, Process.
Hameed, Factors affecting the carbon yield and adsorption capability of the mangosteen peel activated carbon prepared by microwave assisted K2CO3 activation, J.

The ideal joint prosthesis should have following properties anti-corrosion, bone ingrowth, anti-infection and same mechanical properties of natural bone.
They have different mechanical and optical properties compared to the large grained materials of the same chemical composition [3].
Scientists had performed nano-related research and experimentation over the years, and had achieved some initial results, the implants coating with nanophase materials shows amazing properties.
Conclusions The hip replacement prosthesis stability and abrasion rate determines the survival rate and affect the quality of life of the patients.
In recent years, hip prosthesis design not just stick to the morphological, but more focus on bone-implant contact ways, osteointegration, wear rate and other factors.

Surface chemistry is, in many cases, determined by the nature of the bulk material used, which depends on the mechanical properties required for the application.
All of these properties make them suitable for dental implant material.
Although no other metal can withstand the fluctuating oral conditions like gold, other alternatives alloys with suitable mechanical and chemical properties are available on the markets which are close enough to the ideal dental materials.
Ti and its alloys, so far, have proved to be the most befitting materials for biomedical applications due to their particular characteristics such as better mechanical properties, excellent biocompatibility and superior corrosion behaviour [25].
Moreover, this alloys are materials of choice in biomedical devices due to their superior properties and performance especially biocompatibility and corrosion behaviour.

Titanium Skull Prosthesis Multi-Point Forming Medical titanium sheet of material properties and characteristics of plate directly impact on shaping the process of plate deformation law, while multi-point forming press device parameters as well as the availability of the blank holder will restrict the stamping forming quality.
Mathematical model of the skull prosthesis Medical material properties of titanium alloy and sheet features.
Properties of the materials parameters on the forming properties have a greater impact, while also directly affects the characteristics of plate shaping in the process of plate deformation law.
China Mechanical Engineering, 2008, 19(13): 1610-1620
China Mechanical Engineering, 2008, 19(6): 748-750.