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Polyvinylidene fluoride (PVDF) is one of the popular membrane materials due to its outstanding properties including thermal stability, chemical resistance and excellent mechanical strength and has been widely used for MD [2].
Usually, the functional groups give the chemical reaction properties of the compound.
This suggests that excessive formic acid treatment could damage the mechanical property of the PVDF membrane.
It is known that the reaction on a regular basis occurs at the surface of the membrane and the surface area is one of the major factors to determine the membrane distillation efficiency [9].
Wang, Interplay of the factors affecting water flux and salt rejection in membrane distillation, Water, 12 (2020) 2841-2875

The superior properties of GP have encouraged researchers to do further investigation on its performance.
Corrosion is a process which a physicochemical reaction between the material and its environment and brought to changes in the properties of the material. [1].
It has the properties superior than OPC and a most suitable substitute for existing OPC concrete.
Geopolymeric materials which derived from coal ash (Class F and/or Class C) can exhibit superior chemical and mechanical properties.
There are two main factors which could destroy the passivating condition in OPC concrete; carbonation process, acid and chloride attack. 2.

Main factors of the slagging 1)The coal quality[2]. (1) Fusibility of coal ash.
It is one of the main factors that determine whether slagging or not.
The specific steps of judging slagging by the fuzzy comprehensive evaluation model: Firstly, select the factor set of evaluation object that affect slagging, following factors are considered in the judgment: t2 of the ash softening temperature, SiO2/AL2O3 of silica/alumina ratio, B/A of alkali/acid ratio, G of silicon ratio, diameter of dimensionless inscribed circle, temperature of dimensionless furnace and local atmosphere conditions, in total of seven factors, so X={X1, X2, Xn-1, Xn}={t2，SiO2/AL2O3，B/A，G，ψd，ψt，ats}.
Mechanical and Electrical Information, 2013, 21: 39+41 [4] Li Wenyan.
North of China Electricity Power University(Bei Jing), 2003 [5] Zhang Zhongxiao, The study of coal properties and boiler slagging[D], Tsinghua University (Bei Jing), 1998

Appropriate reasonable cutting parameters is one of the important factors to improve the product quality and the efficiency.Based on dynamic simulation optimization function of cutting parameter database through the definitions on the acquisition data standardization, the coefficient of cutting force using Dynacut dynamic test and identification experiment, and through the simulation and optimization and final of Opticut Simucut actual cutting parameters of process validation entry in the database.
Introduction CNC cutting parameter selection of the appropriate or not will affect the product quality, productivity, processing cost, etc.In order to provide more optimal cutting parameters and abroad have done a lot of research with Germany, the United States, Sweden, the UK, Japan and other 12 countries set up more than 30 metal cutting database;China chengdu tool research institute, NanHang university, Beijing institute of technology, BeiHang university, established some universal and special metal cutting database system [1].According to the research status at home and abroad, most of the cutting database is the combination of entity, specific consideration of dynamic factors which influence the stability of machining cutting database is very few.
The Tool Information.Cutting tool is used for cutting tools in mechanical manufacturing, information source tools manufacturer's manual and the enterprise homemade manuals, etc., attributes include: tool category name, cutting tool structure and vendors, cutter, blade model, geometry parameters (diameter, number of teeth and helix Angle, the tip diameter, rake Angle, Angle, etc.), cutting tool material, clamping, etc.
The Workpiece Material Information.Metal parts is the main object of numerical control processing, such as all kinds of steel, aluminum alloy used in military enterprise accounts for a high proportion, high strength steel, titanium alloy, magnesium alloy, high temperature alloy also have a certain proportion, and the physical properties of the workpiece material will be focused on in the process of machining.In the dynamic simulation optimization of workpiece material identification of milling force coefficient correctly or not directly influences the accuracy of the simulation results.Cutting force coefficient considering the properties of cutting tool and workpiece material, cutting tool geometry, card loading condition such as main factors.Comprehensive consideration of the complexity of the model and the calculation precision, the average cutting force coefficient model [3].Experiments show that for the precision of the conventional material average coefficient of cutting force model
China Mechanical Engineering（2005）,pp.1146-1150

With the model, the law that illustrates the influence of sheet properties on the deformation procedure of drawing panels is get, and the criterion for selection of panel material is provided for production.
In contrast with shallow drawing, depth of drawing is greater than 20mm or the total deformation is above 15% in deep drawing, and factors which impact the formability of deep drawing parts mainly are hardening exponent n, planar anisotropy r and yield strength σs of blank.
The material of parts is ST14 cold-rolled sheet steel and its properties are illustrated in table 1 [7].
（a）Shallow drawing part （b）Deep drawing part （c）Bulging-deep drawing part Fig. 1 Typical drawing parts Table 1 Mechanical properties of sheet ST14 Thickness t ［mm］ Young’s Modulus E ［GPa］ Poisson Ratio ν Yield Strength σs ［MPa］ Elongation δ［%］ 1.00 207.00 0.28 162.00 52.10 FEM Model.
Besides mentioned above, the curved surfaces that describe the relation between forming safety margin and blank properties approximate largely under different yield strength σs.

Effects of High Yield Ratio on Material Properties of Pipeline Steel TingZhen Yao Materials Processing Engineering Key Subject of Xi'an Shiyou University Xi’an, Shanxi, 710065, China tzhyao@xsyu.edu.cn Keywords: Yield Ratio, X80 Pipeline Steel, True Yield Ratio, Static Toughness; Abstract.
Introduction Yield ratio is an important parameter of material properties, which is the ratio of yield strength to tensile strength.
It is related to the uniform deformation capacity and critical crack of material, the carrying capacity of pipelines and other factors.
The properties of X80 pipeline steel has been analyzed on the real yield ratio and static toughness.
Table1 Mechanical Test Result of Five Materials No.

Especially, a crack phenomenon like hot tearing involves an interaction between stress and metallurgical properties.
In this paper, we studied the relationship between hot tearing and thermal stress considering metallurgical properties.
Macro stress is associated with mechanical constrains as like rigid core and mold.
The new hot tearing predictor is expressed by the linear combination of the stress factors and metallurgical factors as follows )()( mfCsfCH m s += (1) Where f(s) and f(m) are the functions of stress and metallurgical variables, respectively.
Table 1 The ratings of resistance to hot cracking and influence properties on the ratings α (µm/m· k) Composition (Wt %) Material Ratings Liquid Temp.

Most of the properties of these parts are extremely high that they are not always easy to process using conventional techniques.
Parameters affecting the quality of micro holes which can save money and time have also been focused [4]. 2.
As the aim of the work is to produce micro features of high quality, the materials are so selected that their related properties are high.
Properties of copper are Melting point: 10850C, Density: 8.93g/cm3, Electrical conductivity: 5.96X107S/m and Hardness: 35HB.
J, Parameters affecting the quality of electrical discharge machining process, Advances in production engineering and management, 5(2010)4, 245-252 ISSN 1854-6250

During the process of it based on molding in barrel technology, one of the main factors influencing to whether UHMW-PE pipe can be successfully molded or not is whether the melting process of raw material is adequate and appropriate or not.
For its excellent physical mechanical properties, UHMW-PE can have been found wide application in many aspects of our national economy, it is the most excellent pipe material with wear-resistance and resistance to chemical corrosion especially for transportation of the granule or powder state of materiel, plasm, a mixture of solid and liquid, there are very wide application fields to pipe of pure UHMW-PE[1～2].
Although the latter can produce pipe in a row, but some additives must be added in modeling process to change flowability of UHMW-PE melt, which will cause the molecular weight of UHNWPE pipe to be decreased after UHMW-PE pipe having been molded, thus will lower excellent service properties of UHNWPE pipe.
Whether the melting process of raw material is adequate and appropriate or not is one of the main factors which determine whether the molding process of UHMW-PE pipe can be successful or not.
The Features of UHMW-PE and application in Machinery, Mechanical Engineering Materials [J],2001(8): pp43-46. 2.

The factors with influence on water absorbency performance including molar ratio of AM to AA, neutralization degree, content of crosslinker and initiator were investigated.
Because of its properties of absorbing water and insolubling in water, hydrogels can be applied to various fields, such as daily necessities and cosmetics, medical supplies, building materials, etc [4, 5].
It was difficult to apply widely because of poor mechanical properties and shortcomings of instability.
To prepare hydrogel with good water absorbency and mechanical properties high content acrylamide is introduced into cross link network in this paper.
In Table 1, the orthogonal experiment was designed on four factors and three levels.