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Most of present studies on strength properties of PPTA paper-based materials just consider one single factor, lacking of overall system factors analysis.
The factors, hot pressing temperature(X1), hot pressing pressure(X2), proportion of PPTA short-cut fiber(X3) and beating degree of PPTA-pulp(X4) were selected as experimental factors and the strength properties(tensile index (YT), wet tensile index (YW)) as the response values.The factors and levels were shown in Table 1.
Table1 Analytical factors and levels for RSM Factors Level Low (-1) Zero (0) Up (1) Hot pressing temperature X1[℃] 125 155 185 Hot pressing pressure X2[ MPa] 0.5 1.5 2.5 Proportion of PPTA short-cut fiber X3[%] 15 45 75 Beating degree of PPTA-pulp X4 [°SR] 25 36 47 Results and discussion The regression equations of the strength properties of PPTA paper According to the experimental design, 29 times experiments of 4 factors and 3 levels were carried out, the design and results of RSM experiment were shown in Table 2.
Studies have shown that PPTA paper’s mechanical properties can be improved by hot-pressing process [10].
Properties of new printed circuit board base materials [J].

The content of magnesium-based intermetallic phases, their morphology and distribution throughout the matrix affect the mechanical properties of the aged alloy as well.
The presence of gas porosity adversely affect mechanical properties of the cast components.
It was shown that solution temperature has a strong affect on tensile properties of solution treated A380.
But, all the strength-enhancing factors negatively affect the elongation, of which the samples treated at 200˚C was comparatively lower than that of the as-cast ones.
The content of magnesium based intermetallic phase, their morphology and distribution throughout the matrix affected the mechanical properties as well.

Mechanical Properties of HPC and Numerical Simulation of Mine Shaft under 3D Load Hui Cao1, a, Lin-lin Jiang2,b 1 Beijing Polytechnic College.
The mechanical properties of high-strength concrete was studied in the laboratory, and obtained a high strength concrete uniaxial compressive strength changes with curing period, found that low temperature curing C100 Poisson's ratio of concrete is 0.24, and elastic modulus reached about 52.5GPa.
Mechanical Properties of High-strength Concrete Test Preparation of High Strength Concrete.
Many factors affect the elastic modulus of concrete, all affect the strength of almost all the factors affect the elastic modulus.
Numerical Study of Mechanical Properties of Concrete by the Shaft Separate Reinforced Concrete Model.

Creep Stress Analyses Affected by Load Properties on P91 Pipe with Local Wall Thinning under High Temperature XUE Jilina ZHOU Changyub PENG Jianc School of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing 210009, China aemail:jilinxue@126.com; bemail:changyu_zhou@163.com; cemail:joepengjian@163.com Keywords: High Temperature; Stress Analyses; Creep; Local Wall Thinning; Load Properties; Finite Element Analyses (FEA) Abstract.
Then, the stress and strain of pipes with local wall thinning affected by load properties were discussed.
The results indicate that creep stress and creep strain increase with load properties.
In this paper, creep stress and creep strain affected by load properties have been analysed, which include three groups: monotonic internal pressure, monotonic moment and both internal pressure and moment.
Here, maximum loading factor is applied, i.e. k=1.

Building materials is of various kinds, and its properties varied, it can generally be divided into: physical properties, mechanical properties, chemical properties, durability, etc.
The materials in different parts of a building are affected by a variety of different external factors effect.
Some building materials also have additional properties except for those basic properties which are to realize building function, for example, some coating can release formaldehyde which is harmful to human.
Additional properties make material use restricted, and then affect the market price.
In order to better analysis and determine the factors of building materials price changes, it is necessary to understand the main properties of building materials and master the material quality evaluation index.

Before the forecast, it is necessary to determine main factors of controlling prominent from multiple and complex factors.
Analysis of Effect Factors Currently, there are a variety of coal and gas outburst mechanism hypothesis, but degrees recognized higher as: coal and gas outburst is the result of the combined effects of the physical and mechanical properties of the ground stress, gas and coal [3,4].
Methane Diffusion initial velocity is related to coal gas content, the pore structure and surface properties.
Coal consistence coefficient reflects the physical and mechanical properties, and is one of the important parameters affecting the coal and gas outburst.
In actual production, the main factors are consistent with above result.

Effects of Solution Temperature on Microstructure and Tensile Properties of Casting Duplex Stainless Steel Hongliang Xianga, Dong Liub, and Fushan Hec School of Mechanical Engineering of Fuzhou University, Fuzhou 350108 PR.
Austenitic grain size and morphology are the most important factors on tensile property.
When using different solution temperature, not only the morphology, size of phase could change, but also two-phase ratios and distribution of alloy elements in the phases could alter, which ultimately affect the mechanical properties [4, 5].
Austenite grain size and morphology are main factors affecting the tensile strength.
Mechanical properties of engineering materials, edited by Machinery Industry Press (2003) (In Chinese)

The results of studies of selected properties of grain products, affecting the intensity of the wear of materials of the handling facilities in the port grain elevator have been presented in the article, as well.
These include factors related to: - the type and properties of transported cargo, - method and procedure for sending cargo, - the impact of climatic and environmental factors on system components.
The authors pay attention primarily to the lack of standardization of methods for testing the mechanical properties of cereal grains.
Laskowski (editors): Mechanical Properties of Granular Agro-Materials and Food Powders for Industrial Practice.
Horabik: Characterization of mechanical properties of particulate solids for storage and handling. 1-145, (2005)

The Impact of Mineral Fillers on the Mechanical and the Thermal Properties of Polyester Khaled.
Their effects on the mechanical and the thermal properties were investigated.
Mechanical properties are often the critical factors in selecting a polyester resin for a specific application.
The mechanical properties of polyester as well as their structure are reported to be highly affected by the processing conditions [2,3].
Mechanical Properties Testing The mechanical properties evaluated here are: compressive, tensile, and flexural strengths as well as the tensile modulus of elasticity and the hardness.

The result of the statistical correlation matrix revealed that penetration rate and bit wear rate are dominant factors affecting the prediction of specific energy having high coefficient of correlation.
A comprehensive understanding on the mechanical and physical properties of the rock is required for successful drilling operation [3].
The concept of specific energy has been introduced by Teale [4] as the energy required to excavate unit volume of rock, this can be used as an index of rock mechanical properties of rock mass.
The factors affecting specific energy when drilling blast - hole in quarries are area of drilled hole, penetration rate, rotational speed, pull down weight on the bit, depth/length of drill string, and formation properties.
Considering the simultaneous effects of various factors relating to rock materials in drilling process, test of the effect of one factor on penetrability of rock samples may be encountered with many errors as suggested by Hoseinie et al [9].