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It is indicated that surface smoothness is a critical factor to affects the performance of RP & M products.
Many researches and experiments indicate that surface smoothness is the critical factor of rapid prototyping to affect its density, mechanical properties and stability of successive stack layer by layer [2-10].
Experiment Setup There are mainly five factors affect rapid prototyping based on welding, including welding current (I), arc voltage (U), Contact tip to workpiece distance (CTWD) (L), wire feed rate (Vf) and travel speed (V) .
Experiment and Result Experiments design the quadric regression function of this experiment system: (1) There are three factors in this experimental system.
Processings of the Institution of Mechanical Engineers Part B-Journal of Engineering Manufacture 215, pp. 1519-1527

The results show that the major factor affecting reduction of IFT is surfactant concentration accounting for 98.1%.
As a result, it can change the interfacial properties of the fluid-fluid interface.
This equipment connects to camera and computer to measure the change of properties.
Therefore, IFT is not affected by the change of pressure.
The main factors for IFT reduction are surfactant concentration and salinity accounting for 98.1% and 86.3%, respectively.

Shape memory alloys, especially NiTi (nitinol), represent a very good alternative for actuation in equipments with moving dispositive based on very good actuation properties, low mass, small size, safety and user friendliness.
Meanwhile, the recovering period affect the entire financial issue from the individual cost, financial or medical and ending with the entire financial costs of the care provider [1].
An important role in this system is represented by the producing materials of the recovery gearing opting for more lighter, more stronger, resistant to external factors alloys, and last but not least cheaper [2].
Mechanical joint is generally discreetly adjustable for the flexion-extension amplitude and allows the rotation control.
Mechanical system for joint rehabilitation [7] In the case of the mechanical forearm (Fig. 2) there are possible both joint movements so that the patient can be rehabilitated by a passive joint movement.

Fracture Properties of Percussion Tools Piston With a certain type of percussion tools in their normal work of piston happening ruptures, for example.
So it can be preliminary conclusion, that is: Fracture properties of percussion tools piston is the typical fatigue fracture.
The load characteristics is a higher frequency of pulsed wallop, belong to alternating load properties that have the basic conditions of fatigue damage occurred.
Fig.4 Breaking point The Fatigue Fracture of the Factors Affect the Pistons Fatigue fracture of the piston by the following aspects of the reasons: (1) Piston bad load characteristics.
The mechanical parts.

Hence, methods are needed to assess the fatigue resistance of prospective of new materials based on a substantially reduced test matrix of mechanical properties.
It should be noted that this value is still well within the range of small scale yielding for the given mechanical properties.
Because there is no mismatch in elastic properties, the elastic fracture mechanics relations for the mixed-mode stress intensity factors, energy release rate and phase angle are all unchanged.
Hence, in the context of small-scale yielding, mismatches in plastic properties affect only the elastic-plastic behavior in and around the crack tip plastic zone, which in turn affects the plastic dissipation per cycle.
Indeed, applications in welding, soldering and layered manufacturing result in a heat affected zone, where a grading of mechanical properties can exist between layers.

This study aimed to investigate the in vitro mechanical properties of Thai non latex orthodontic elastics and compare these mechanical properties to commercial natural latex orthodontic elastics.
In real practice, elastics are exposed to numerous intraoral factors, e.g., saliva, as well as the movement of the jaws in their normal functions.
In summarize, Thai nonlatex elastics are not comparable to latex elastics regarding mechanical properties.
The mechanical properties among five brands of orthodontic elastics were noticeablydifferent.Thainonlatex elastics had significantly different mechanical properties from natural latex elasticsas reported in previous studies.
In vitro assessment of the mechanical properties of latex and non-latex orthodontic elastics.

The results show that the bamboo plywood and profiled steel sheet can effectively work together, the composite walls possess wonderful seismic properties, and that changes of thickness or corrugation-height of profiled steel sheet make very sharp differences to the properties of the walls.
Experimental results show that they can meet the requirements of mechanical properties of building slab [3, 4].
The ductility factor is calculated as µ=∆max/∆y.
References [1] Huaqiang Yu, Benhua Fei, and etc.: Variation in Tensile Properties and Relationship between Tensile Properties and Air-Dried Density for Moso Bamboo.
Scientia Silvae Sinicae Vol.42 (2006), p.72 [2] Zehui Jiang, Liang Chang, and etc.: Physical and Mechanical Properties of Glued Structural Laminated Bamboo.

Study of Erosion on Metal Materials for High Pressure Pipe Manifolds Zhang Jixin1, a, Fan Jianchun1,b , Zhan Xianjue1,c, Jiang Xin1,d 1College of Mechanical and Transportation Engineering, China University of Petroleum-Beijing;18 Fuxue Road, Changping, Beijing ,China 102249 azjx1163@163.com, bqdhlkz@163.com, c80147462@163.com, d27402357@qq.com Keywords: Erosion; Metal materials; High pressure pipe manifolds; Influencing factors Abstract.
Equipment failure caused by erosion and corrosion on metallic materials Erosion phenomenon encountered in multiple phase flowing is a very complex process that can be affected by many factors including the properties of multiple phase flow and target material, and the metallic materials its relative corrosion and erosion resistance to the service environment [1,2,3].
The erosion wear experiment shows the impact angles, the particle size and the flow velocity are significant factors influence erosion of mental materials.
SEM graphs of test surface condition with different impact angle, velocity of 20m/s Conclusions Results from the study, the impact angles, the particle size and the flow velocity are significant factors influence erosion of mental materials in fracturing operation condition, those influencing factors has significant effect on mass loss rate of mental materials of 30CrMo.
However, the study on corrosion–erosion properties of materials is rather limited.

Alumina, a bioinert material demonstrates exceptional stability in the physiological environment with properties of excellent corrosion and wear resistance.
The success of a porous scaffold depends on its ability to provide a functional balance between mechanical strength, porosity, pore size, interconnectivity of the porous structure, and properties of osteoconductivity [3, 4].
In all cases, properties were correlated with the ammonium mole fraction.
Taboas, Optimal design and fabrication of scaffolds to mimic tissue properties and satisfy biological constraints.
Hench, Factors Affecting the Structure and Properties of Bioactive Foam Scaffolds for Tissue Engineering.

They are based on few parameters dealing with: - the intensity of the expected seismic event; - the elastic properties of both the main structure and the non-structural component; - the position in height of the non-structural components within the main structure.
The other symbols have been already defined and do not change their mechanical meaning.
(12) The properties defined in (9)-(12) completely control the response of the 2DOF system within the linear-elastic range.
Figure 2 deals with the case of a short period structure (T1=0.2 s and T1=0.5 s) and shows that the Fa/maSag ratio is significantly affected by the force reduction factors of the main structure.
Moreover, the force reduction factor plays a less significant role in affecting the dynamic response of the non-structural component and, especially for long period structures (T1=2.0 s), the predictions based on Eurocode 8 are generally too conservative.