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Powder metallurgy is a new method for mass production of precision components with appropriate mechanical properties, but in this kind of materials (PM parts) with special microstructures (pores act as local stress risers), fracture due to fatigue is expected as an important destructive factor.
Fatigue is a complex phenomenon influenced by numerous factors.
The resistance against fatigue failure, in common with all other properties of such materials, improves as the porosity is reduced [5-7].
Therefore, fatigue crack growth is governed by local mechanical properties in the region of crack tip [11].
The effect of homogeneity/heterogeneity on fatigue properties is subjected to different opinions.

,Ltd of CTCE Group,Hefei 230023 ,China 2School of Mechanical and Materials Engineering, Jiujiang University, Jiujiang 332005 a fj9699@126.com, bliyonhi168@163.com Keywords: Clad bridge plates; Orthotropic; Stainless Steel ;Welding process; Optimization.
Abstract: Clad plates welding of stainless steel welding on interlayer between grass roots and the transition layer is a key technology.Structure and properties of welded joints is very uneven,and there have often welding repair cracks.
The form of V-type and CO2 welding gas arc welding process are used.There have a larger gap ,large welding field strength and too slow to affectting the duration because of the site group.
Weld of clad bridge plates Process Optimization of Welding Preliminary studies have shown that there have many factors affecting welding quality of composite bridge plates and this is a very necessary to welding quality assurance.
Improve the quality of manufacturing cells 1) The cutting material need specification, and heat treatment must be completed,;there need subsequent heat treatment if necessary and control the accuracy of production unit. 2) There has a right cutting-groove technology and subsequent heat treatment in order to eliminate stress and improve material properties. 3) Transportation, installation, assembly and other process specifications shall be developed , and it will eliminate roughness, control gap and reduce the stress concentration. 4) The design innovation riveting bolts。

. % of FGRC has similar mechanical properties as reference cement paste.
However, using suitable methods may reduce or even eliminate a negative impact on the mechanical properties of concrete.
But still it is not clear how much of these grains FGRC contains and whether the results are not affected by other factors.
• Initial mechanical tests indicate that cement paste with 30 wt. % of FGRC has similar mechanical properties compared with reference cement paste
Lidmila et al., Mechanical properties of recycled binder/micro-filler cement-based material, Advanced Materials Research 1054 (2014) 234–237

The crystallization properties, thermal stability, flame retardant properties, mechanical properties and mechanism of flame retardant PET and fibers were studied.
The degree of orientation and crystalline are the important factors on the strength of the fiber.
The orientation factors increase slightly with the addition of the flame retardant increase.
This work describes a straightforward and systematic approach to prepare flame retardant PET fibers with superior mechanical properties.
Structure and properties of phosphorus flame retardant copolymer.

The ability to exist due to the various factors affecting the reliability of uncertainty, such as load, material properties, such as variation calculated differences of the imperfections of the model, production quality, but these factors are random, and therefore the completion of the engineering structures predetermined function only with a probability measure.
Without uncertainties include probabilistic uncertainty analysis probabilistic model of uncertainty, the uncertainty of the physical and mechanical model, the cross-section resistance of the basic assumptions of the formula and calculation model inaccuracies and human neglect and material properties, geometric parameters error.
Because these attributes are not visible during the query, which in the initial stage to estimate these properties.
Influencing Factors of Probabilistic Model Changes in the real world are being affected by a number of factors, including deterministic and random.
From the background, purpose and means of modeling, the main factor is to determine the random factors can be ignored, or simply random factors can appear to the average effect, you will be able to establish a deterministic model.

The morphology of final coating products was observed with scanning electron microscopy, while the mechanical properties and water content were measured with crushing strength and water stability tests.
Mechanical Properties.
Results and Discussions SEM and Mechanical Properties Multilayer coating on NPK 16-16-16 fertilizer with polyurethane will affect product traits, such as hardness and hygroscopicity.
Other mechanical properties testing like hardness, as described in fig.1, are vital since the interaction between some plasticizers in polymers can significantly affect product characteristics such as hydrophilicity, size, and molecular structure [12][13].
An advanced test to observe the increase of mechanical properties of the sample is the water stability test as shown in fig.2.

The tool material should possess mechanical properties such as high wear resistance, good elastic and fatigue strength.
For MRR, three factors were significant- work material (79%), tool geometry (10.86%) and grit size (5.50%).
They concluded that spindle speed and feed rate were the most significant factors which affect edge chipping.
The model shows that static load, grit and concentration of abrasive, rotation speed of tool, feed rate and work material properties affect the material removal rate in rotary ultrasonic machining.
Tool materials must have an optimal combination of mechanical properties because these properties affect the productivity of the process.

By adopting the combination of orthogonal test and comprehensive score method, optimized design of injection molding technology, adopts the comprehensive evaluation method, the quality of the original data standardization, and linear combination calculation, obtained the optimum technological parameters combination and the significant factors affecting quality index.
In this experiment, the influence factors such as filling time, mechanical property and forming quality were analyzed by orthogonal test.
Kuang Y[3] has adopted orthogonal test method in this experiment to analyze influence factors, such as the filling time, mechanical properties and molding quality in the process of the interjection molding of polypropylene.
Since factors B, C, D, E and F did not have significant influence on quality, they were considered as adjustable factors.
Mechanical Engineer,2016(08):151-153

MODELLING OF NITROGEN DEPOSITION PRESSURE EFFECT ON GRAIN SIZE DEVELOPMENT AND MECHANICAL PROPERTIES OF NANOCRYSTALLINE TERNARY NITRIDE COATINGS R.
In deposition of complex ternary nitride coatings, the nitrogen deposition pressure plays an important role in structural evolution of the coatings leading to development of different mechanical properties.
Despite these extensive studies, quantitative models related to the effect of nitrogen deposition pressure on microstructure and mechanical properties of the coatings are still lacking.
As reported in recent studies by the authors [9-11], with increasing nitrogen deposition pressure, the deposition rate and composition of the coatings change, which in turn affect the microstructural development and mechanical properties of the coatings.
The number and kinetic energy of the depositing atoms/molecules have been considered as major factors determining the adatom mobility and formation of the nucleated clusters, which in turn determine the microstructure and surface morphology of the films.

Microstructure and Properties of Niobium Microalloyed Pipeline Steel in CSP and Steel Pipe Produced by ERW GAO Jixiang1,a* , LI Liejun1,b, WEI Shaojun2,c 1.School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, 510640, China 2.Panyu chukong Steel pipe Co.
By analyzing the effect of ERW on mechanical properties of steel pipe, as well as changes of mechanical properties of steel plate and steel pipe,it could provide guidance for setting steel reasonable performance indicators.
The mechanical properties of plate and steel pipe of φ323.9×9.5mm X65 produced by EWR were statistical.
Special emphasis was, strength properties had a great relationship with pipe forming and expanding process.Under the conditions of forming different aspect ratio and the different expansion ratios ,the strength properties were not the same, so the role of various factors must be taken into account.
Study on Microstructure and Properties of Ultra High-strength Weathering Steel Produced by TSCR [D].​​, South China University of Technology, 2012