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As a result, industrial and agricultural production and water for living are affected.
It can reflect the weight of different evaluation factors on the quality of groundwater, extrude maximum pollution factor and reflect objective conditions of groundwater quality.
Explanation percent of extracted factors is general required to exceed 85% [5].
Therefore, the first three factors were extracted to as the main factors.
Nickel is used for mechanical plating to protect the underlying metal from corrosion depending on its anticorrosion and antioxidant properties.

The measurements mechanical properties showed that the tensile strength of the polymer alloy was improved with styrene content.
The synergistic effect of PS and PDCPD also played a part in enhancing the mechanical properties of polymer alloy.
And the mechanical properties of IPNs may exceed the corresponding component polymers because the entanglement in IPNs cannot be separated permanently.
The report focused on the affect factors of the frontal polymerization, and did not study on the structure and mechanical properties of the polymer.
Mechanical Properties.

Since the fatigue crack propagation process from initial size till final fracture is affected by lots of random factors, it is difficult to evaluate the fatigue reliability.
Since the fatigue crack propagation process from initial size till final fracture are affected by lots of random factors, such as uncertainty of material resistance, randomness of service loading and difference in specimen geometry, it is difficult to analyze and compute the fatigue reliability.
Let initial crack size be , the crack size at time can be derived through integrating from Eq.1 as (3) and the maximum stress intensity factor (4) Whenever the maximum stress intensity factor exceeds fracture toughness of material , fracture failure occurs.
As a mechanical property of material, fracture toughness also has stochastic characteristic.
Accordingly, the multiplying and power factor can be randomized and JC method is also applicable for spectrum loading.

Moreover, the factors that affect center tower stiffness are determined.
This will lead to excessive girder deflection, affecting the usability of structure, and tower body to bear shear and bending moment.
With regard to multilane, lateral reduction factor is 0.55.
Four major factors must be considered, they are vertical displacement of girder, horizontal displacement and main cable anti-slides safety coefficient at the top of center tower, along with the maximum bending moment at the root of center tower.
While the maximum bending moment at the root of center tower have a trend of increasing, developing toward a direction that is adverse to structural mechanical property.

Ruan1,2,d 1School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China 2Zhenjiang V-Zenith Laser Technology Co.
In order to enhance mechanical property and restrain crack growth of 6061-T6 aluminum alloy, laser shot peening (LSP) was employed to induce compressive residual stress and plastic deformation on the surface of metal.
LSP process involves many factors, if every influencing factor estimated experimentally, it will be time consuming and costs a lot.
The analysis of fatigue crack growth properties after LSP is on the basis of residual stress field, the procedure consists of two steps: simulation of residual stress field induced by LSP and numerical analysis of fatigue crack growth performance.
According to fracture mechanics, fatigue crack growth rate, which is mainly affected by the elastic modulus (E), stress intensity factor threshold value () and fracture toughness, is an important parameter to determine fatigue behavior of specimens.

Taking some deep buried immerse tunnel as the background, the paper discussed the deformation characteristics of gravel bed by physical model experiments to get the settlement and compression modulus, appraised the impact of factors over deformable characteristic.
The test load is applied step by step according to the design load by the loading system, and data such as gravel top settlement, pile stress, gravel pressure data etc are recorded by measurement system to calculate compression modulus, resilient modulus of the gravel bed, and to evaluate the impact of various factors on mechanical properties of the gravel bed.
Reasonable gravel non-uniformity coefficient and curvature coefficient are beneficial to improve the gravel modulus, but a continuous gradation will reduce the gravel porosity, and affect its capacity to accept silt; B2 particle size shows the best mechanical properties, compression modulus of 8.55MPa, high porosity, which were used as final selected gradation.
Gravel crushing will affect the performance and durability of the foundation and bring the project risk.
When selecting gravel gradation, it should also consider the compression modulus, porosity, particle size and other factors

Experimental Study of Tensile Preloading Influence on the Mechanical Behaviour of Pseudo-Ductile Hybrid Composite under High-Velocity Impact Nikita A.
Tensile or compressive preloading affects not only the amount of energy absorbed by the composite but also changes the deformation and fracture pattern.
Preload is one of the important factors affecting the mechanical behaviour of FRPs under the impact.
Valente, et al., Hybrid composites based on aramid and basalt woven fabrics: Impact damage modes and residual flexural properties, Mater. and Des. 49 (2013) 290-302
Zhikharev, Effect of tensile preloading on the ballistic properties of GFRP, Composites Part B. 169 (2019) 524-531

Introduction Safety and weight have become increasingly important factors affecting consumer choice in automobile markets.
Most studies have focused on the mechanical properties of the formed part, numerical simulations, and the design of mold-cooling systems.
The forming process of hot-stamped parts and the optimization of thereof has also been described[10–12], and the thermodynamic properties of the workpiece during hot stamping has been analyzed along with the characteristics of the formed part[13–15].
During hot stamping, the primary factors affecting the forming force are the initial forming temperature, forming speed, heat transfer coefficients of the mold and sheet metal, part shape, and thickness of the sheet-metal workpiece.
During hot stamping, the temperature of the workpiece should be as uniform as possible to achieve uniform mechanical properties of the workpiece as it deforms.

The testing shows that the pre-stress not only improves comprehensively the load-carrying properties of composite wall, but its fracture mechanism and mechanical model are the same as that of the non-pre-stressed composite wall, so that the same design approach can be used.
Introduction The aims of this test are: to explore the pre-stress’s influences on the emergence and development of cracks and their fracture morphology and deformational characteristics under the eccentric load of composite wall’s out-of-plane, by the static test of the four walls that consist of two different pre-stressed composite brick wall models of two-layer vertical pre-stress; to analyze of the influence factors of bearing capacity; to verify the methods of calculating proposed by relevant institutes [5].
All this can effectively prove the advantage of prestress. 4.2 Analyses of factors and laws that affect the eccentric compression performance of composite wall’s out of plane In addition to the several influencing factors proposed in literature [4] [5], the analysis of Table 3 shows that prestress is also an important factor.
In short, the destruction mechanism and mechanical model of composite frame are identical to that of non-prestressed composite wall, see details in literature [4].
    (3) The stiffness of loaded beam, strength of material, structural column’s spacing, columns and ring beam’s cross-section, reinforcement, the upper structure and downstream load and the size of the openings etc. are equally the factors influencing the mechanical behavior of prestressed composite wall, and have the same influence pattern

As result of recent developments, these materials can be produced with various electrical, thermal and mechanical properties according to their intended purpose [1-5].
It is important to assess the effects of the various environmental degradation factors on the tracking and erosion performance of the material in use.
EXPERIMENTAL RESULTS 1- VIRGIN TESTED SAMPLES: The virgin tested samples were evaluated in the fog chamber to provide reference data for comparison with samples, which were subjected to the various degradation factors.
Organic materials degraded by environmental factors could either enhance leakage current and accelerate tracking or cause erosion failure.
Hence, inorganic fillers are incorporated into the polymer materials to enhance mechanical and electrical properties in addition to minimizing the effects of tracking and/or erosion.