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Friction and wear of the guideway is an important factor which affects its precision, the parameter which affects friction and wear performance is no single.
So improving the precision of the guideway has a critical effect to the requirement of the machine tool precision[1].There are a lot of factors which impact guideway precision and its retaining ability, Li Guo-wei[2] has studied the influence of different structure shapes of the guideway to theirs precision.
But these studies which analyzed the influence factors to guideway precision were mainly from macroscopic, have not been able to explain the influence that the guideway itself to its precision radically.
In fact, the geometrical topography is the basement to study contact models and friction problems, which has big influences on the contact properties of the joint surface and the state of friction and wear in the process of contacting.
To study the contact properties of the joint surface is to study the contact properties of the rigid smooth plane and the rough surface.

Predecessors have made a lot of work in experimental study on the creep properties of plastic geogrid which is in high temperature condition , but to the reinforced earth structure in cold regions, the reinforcing material is in the negative temperature conditions in winter, the limit temperature is below -20 ˚C and in summer soil temperature may reach more than +20˚C, how to clarify the change of the creep characteristics of the plastic geogrid under freezing and thawing cycle and how to calculate the design value require experimental study to explore.
From the outside of standard distance, the distance between gauge line and the clamp should be 25 mm, in order to avoid clamping affecting deformation.
Because of the freezing and thawing cycle affecting the creep properties of the plastic geogrid,when the creep has been stable under normal temperature, it will increase in warming phase and will decrease in cooling phase during the freezing and thawing cycle.
Therefore,to the extrapolated value of the long-term creep strain εle,it should be divided by the impact factor of freezing and thawing cycle DR to correct
Experimental Study on Creep Properties of Plastic Geogrid under Low Temperature.

CBN Slipstone Super-accurate Grinding Theoretical Analysis and Application J.F.Chen, J.H.Cui, F.Li Mechanical and Electrical Institute, Zhongyuan University of Technology, Henan, Zhengzhou 450007, China Keyword: super-accurate grinding, CBN, carding laura, slipstone characteristics Abstract: In this paper, the principle and impact factors for super-accurate grinding are analyzed and discussed.
The factors to affect the super-accurate grinding are discussed.
The properties of abrasive influence directly the machining accuracy of mechanical product and surface roughness.
CBN Grinding Fig.9 Metamorphic Layer Conclusions (1) In this paper, the principle and impact factors for super-accurate grinding are systematically analyzed and discussed
(3) Utilizing the principle and impact factors for super-accurate grinding, we design and manufacture a super-accurate grinder to grind the carding Laura slot surface

This is a highly complex process given the large number of variables and factors involved in it, thus, when one of these is ignored and/or left out of control, process errors and distortions usually occur.
This design studied the factors ‘effects in 16 runs, including 2 central points per block, with the aim of finding the best working area of the risers and the optimal values of the parameters studied under specific conditions.
To better study the influence and interactions of this variables, a design of experiments of the type: Central Composite Design (22) + Star has been selected to be used, which will study the effects of the factors in 16 runs, including 2 central points per block.
This type of steel is also widely used in the mechanical industry for its properties, being a type of steel of medium carbon content and non-alloy.
Farnsworth, Identification of critical factors affecting shrinkage porosity in permanent mold casting using numerical simulations based on design of experiments.

The manufacturing process is a significant influencing factor on the mechanical properties of fiber-reinforced cement-based composites.
Introduction Fiber-reinforced cement-based composites are currently considered to be an important class of construction materials for various applications due to their superior mechanical properties and their flexibility in design capabilities as construction materials [1].
In a composite, the micromechanical parameters that affect the fiber-bridging behavior include the component properties such as the fiber length, diameter, elastic modulus, strength, volume fraction, matrix strength, and elastic modulus, as well as the interfacial properties such as the frictional bond strength, chemical bond strength, and slip hardening effect [3].
In addition to the micromechanical parameters, the manufacturing process also affects the composite properties.
The application of extrusion molding to fiber-reinforced cement-based materials enhances their mechanical properties such as strength and elastic modulus.

Notably, the position of the phreatic surface strongly affects stability, and longer dry beach lengths are generally associated with improved the factors of safety [19].
The primary objective is to develop a numerical model to assess how geometric and geotechnical factors particularly slope angle and sludge height affect the factor of safety, thereby informing the design of stable and sustainable retention structures.
Geotechnical properties of both foundation soils and dike materials were derived from in-situ and laboratory investigations. 2.
The progressive increase in sludge height over time allowed consideration of the evolution of its mechanical properties at different filling stages (Table 7).
In conclusion, dikes constructed from this material (with properties summarized in Table 6) and designed with slopes of 2/1 or gentler are stable against sliding prior to filling operations.

Furthermore, the main factors influencing the critical depth of cut apI are experimentally discussed.
To get a clear understanding of the forming process, the forming principle and main factors influencing the cutting-direction burr are discussed.
Fig.1 Forms of cutting-direction burr in metal cutting The main factors affecting the cutting-direction burr formation include the physical mechanical property of the work material, the end shape of the workpiece, cutting parameters and cutting tool geometry etc.
The main factors affecting the cutting-direction burr formation are cutting parameters, the shape of end of workpiece, cutting tool geometry and workpiece material etc. 3.
Wang: Proceedings of Scientific Research (Mechanical Industry Press, China 1991).

Compared with PA6， the copolymer alloy shows obviously low water absorption and slightly reducing mechanical property after absorption， while the loss of mechanical property is lower.
This paper depends on in situ polymerization of NBR activated prepolymer cation to prepare PA6/ABS alloy, thus improving the dispersion and compatibility of both alloy, and accomplishing good mechanical and water resisting properties.
Analysis characterization Mechanical property test: Measure the stretching property of blends with LJ-1000 mechanical testing machine in accordance with GB/T1040-92/IF.
Results and discussion Water Resistance and Mechanical Property Analysis of PA6/ABS Alloy.Research nylon 6 synthe sized in different systems and water absorption and mechanical property of alloy.
Fig.8 SEM micrographs of impact fractured surfaces of PA6/ABS blends a) PA6/ABS = 100/10 ; b) PA6/ABS/HTBN= 100/10/5 The morphological structure of PA/ABS blends is affected by the blending method, technological conditions and many other factors.

The interest in the use of these alloys is since they combine a very low density, lower than the Ti6Al4V alloy typically used in these applications, and exceptional mechanical properties at high temperatures.
Titanium aluminides can be described as Ti-(42÷49)Al-(0.1÷10)X, with X standing for alloying elements such as Nb, Cr, V, Ta, Mo, Zr, W, Si, C, and B, added to improve their mechanical properties [10,11].
Lubrication strategy is also a factor heavily affecting the wear mechanism and tool life because it reduces mechanical wear such as the abrasion on the tool rake face [32, 33, 35, 40, 44].
Surface integrity The integrity of the machined surface is the result of several factors associated with the milling process of titanium aluminides such as technological parameters, geometry and wear of the tool, as well as the properties and microstructural changes of the workpiece material.
According to the reviewed papers, surface roughness shows dependence on the process parameters, among which cutting depth was the most significant factor affecting it, followed by feed rate and cutting speed [41, 44].

The final forging quality effected by different perform structures of blade body are analyzed in details through comparing some key factors such as formability, deformation uniformity, loss of heat before deformation.
The numerical values of equivalent strain are affected by curvature of the cavity.
During the range of plasticity, large deformation degree is contributed torefine the internal organization of metal and improve forging mechanical properties.
Non-homogeneous deformation often leads to duplex grain structure and worsens the forging mechanical properties.
Low temperature will seriously affect the metal flow and forming quality of forging.