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Manufacture of Custom Contoured Seat Cushions Using Computer-Aided Design Computer-Aided Manufacturing (CAD/CAM) Technique Sekou Singarea School of Mechanical Engineering, Dongguan University of Technology, Dongguan, China Corresponding author: asingarese@gmail.com Keywords: Rehabilitation Engineering; Custom Contoured Cushion; Pressure Ulcer Prevention; CAD/CAM Abstract.
Such pressure sores disrupt every aspect of a person's life—affecting health, employment, education, and social interaction.
References [1] Kosiak M. (1976), A mechanical testing surface: It’s effect on pressure distribution.
Human Factors. 29(5), 563-575
J Rehabil Res, 27(2):135-140 [9] Chow WW: Mechanical properties of gels and other materials with respect to their use in pads transmitting forces to the human body.

Superior mechanical performance makes it widely used in the bridge practical engineering.
Based on the past research, this paper studied the impact factors of constant load, temperature load and live load under different structural systems, in order to analyze the structure performance for different structure system of extra-dosed cable-stayed bridge.
In order to compare the mechanical characteristics of the three structural system, the full-bridge three-dimensional finite element models of the three structural systems were established with the same material, section properties, cable arrangements, load cases and supporting forms, which differ only in the simulation of the different connections among the pylon, girder and pier.
Summary The common forms of the support of the extra-dosed cable-stayed bridge include semi-floating system, pylon-girder consolidation system and rigid-frame system, which have their different mechanical response and their own advantages and disadvantages.
The loading of temperature change does not affect the pylon-girder consolidation system.

The concept of surface integrity includes the assessment of geometrical aspects like shape and dimensions, and physicochemical properties like hardness and corrosion resistance.
It is well known that mechanical properties of machined parts depend directly on microgeometrical and physicochemical surface conditions.
That is to say, a direct relationship between surface integrity -particularly, roughness- and mechanical properties must be found.
Therefore, it could be stated that feeds affect negatively to Ra and UTS.
Indeed, in spite of the influence that surface finish has on UTS there are another physicochemical properties that may have more relevance.

Dynamical characteristics Cutting forces are limiting factor machinability of the material.
The cutting forces affecting mainly the workpiece material, the geometry of the cutting tool and cutting conditions.
It should be noted that the correct design of the range of cutting speed affects the following: higher cutting speed the formation of large-volume chip-greater amount of heat is discharged to a higher volume of material (chips), [10]. [11]. [12].
Pilc, Influence of Cutting Fluids on Cutting Forces when Grinding Bearing Steel, Journal of Machine Manufacturing Design and Manufacturing, The Scientific Society for Mechanical Engineering, Hungary, Volume XLIX.
Martinkovič, Developing processes of property improvement of nickel base superalloys.

The basic physical and mechanical properties of natural subsoil are shown in Table 2.
Basic physical and mechanical properties of natural subsoil.
The properties of improved soil are shown in Table 3.
Properties of lime improved soil.
The value of subgrade elastic deformation directly affects the stabilities of subgrade and track bed, and subgrade elastic deformation reflects in track deformation, which affects running safely and comfortably of high-speed train.

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.

The weld has very low distortion, almost no porosity and very good mechanical properties which has a good prospect to join pieces of materials with poor weldability , such as aluminum alloys and magnesium alloys and so on[1].At present, the study of friction stir welding mainly concentrated on microstructures and the flow mechanism of welded materials[2].
Welding distortion and residual stress in the process of friction stir welding were two important factors that affected the assemblage and property of welded products, and they were still important tasks that needed to be solved in the industry production nowadays.
This programme includes two parts: select appropriate welding parameters (Tab.1) and thermally physical parameters (Tab.2) at first, simulate the temperature field for joints and obtain a temperature field agreed with reality; then load the temperature results on the structure models as thermal force, select suitable thermodynamic properties of materials to forecast and analyse the stress field of joints.
Mechanical behavior in local post weld heat treatment ( Report I) viscoelastic plastic FEM analysis of local PWHT [J] .Trans JWRI, 1998, 27( 1) : 83- 88

The present modified SIMA process was discussed as an alternative thermo-mechanical processing for preparing the alloys with fine grained structure for semi solid processing.
The fine solid spheroids, not necessarily one grain per a spheroid, ensure the better rheological properties by lowering the flow resistance of semi-solid.
Effect of RAP Temperature For semi-solid processing, the insufficient amount of liquid deteriorates the rheological properties of semi-solid, and contrarily its solid-like behavior is lost by excessive liquid fraction [7].
Σε = 0), the 620°C 630°C 635°C 250°C 200°C recrystallized grain size was not affected by the RAP temperature (Fig. 5a) and remained as ∼200 µm at all RAP temperatures (Fig. 6).
However, the multi-forging temperature did not affect the recrystallized grain size.

Dielectric properties of Pure and Strontium doped Nano-Hydroxyapatite Kashmira P.
It is also important to study that how trace elements affect the crystal structure of HAp and its properties.
Strontium increases bone formation and reduces bone re-sorption, thus leading to again in bone mass and improved bone mechanical properties [8].
The electrical properties of HAp have also attracted the attention of many biologist and material scientist [9] because the knowledge of the electrical properties is expected to be a great aid in understanding the cellular phenomena in bone and the developing of bone prostheses [10,11].
All samples show maximum loss factor at the same frequency of 20 kHz.

Such a processing of pure metals and alloys usually results in well-developed deformation structures, involving nanocrystalline (NC) structures, and could accompanied by enhancement of their strength, as also of a number (balance) of physical and mechanical properties [18-21].
Microalloying of aluminum alloys with rare earth or transition metals was discovered as an effective method to control their microstructure and properties [24].
Two main factors caused formation of such a structure.
Thus, factors determining aluminum alloys corrosion behavior, are commonly divided on structural and phase ones.
The effect of cryorolling was conditioned by synergy effect of factors mentioned above.