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Compared with other reinforcement materials, glass fiber has advantages, as follows: low price, high mechanical properties, anti-oxygenic properties, thermal properties, fatigue properties [2,3], etc.
Fig.1 Mechanical properties vs. coupling agent content for 30%GF/PA66 treated by A1100+A+B Fig.2 The curve of tensile strength and strain-at-break of GF/PA66 vary with GF content Mechanical Properties.
Besides, other factors also have a important role in GF/PA66 composites, such as aspect ratio, diameter and length of fiber, surface roughness of fiber, chemical composition of fiber, etc.
Thermal Properties.
Glass fiber content can affect the mechanical and thermal properties: SGF in PA66 can improve the tensile strength, bending strength, heat-resisting temperature, but reduce the impact strength and strain-at-break. 30~40% glass fiber in PA66 matrix are better as to the mechanical and thermal properties.

Whether the inclusions are brittle or ductile, they differ greatly from the matrix material in the mechanical properties such as hardness, elongation, and yield stress.
According to the existing theoretical results, there are four factors affecting the formation of internal cracks of heavy forgings in the forging process i) internal temperature field in the ingot, ii) deformation, iii) rate of deformation, i.e. rate of strain and iv) stress conditions for the forging, i.e. the stress field inside the heavy forgings.
Of the four factors described above, the first three are easy to observe, measure and control whilst for the internal stress conditions of the forgings are not.
Since the chemical compositions of the brittle inclusions are different from those of the ductile inclusions, they have much different physical properties.
Stress intensity factors for ring-shaped crack surrounded by spherical inclusions.

Introduction In order to understand the chemical, physical and mechanical properties of a material, information about the structure, and hence the organisation of atoms in the material is required.
However, it has poor mechanical properties making it brittle, easily crushed, and unreliable for implant applications [2].
The aim of this research is to combine HAp with another compound to form a composite material with improved mechanical properties.
Table 1 Critical factors that need to be controlled during the precipitation process to produce a pure HAp material.
Excluding these regions prevents the intensity from the graphite affecting the HAp structure parameters.

The effects of CNTs content on the thermal properties and mechanical properties were mainly investigated.
Varying the combinations and architectures of these materials affects the material properties on the nanoscales and macroscales.
Influence of CNTs on the mechanical properties of the PP was studied.
The effects of CNTs content on mechanical properties of composites are listed in Table 1.
Table 1: Effects of CNTs content on mechanical properties of composites CNTS content [%] Tensile strength [Mpa] Elongation at break [%] 0 18.61 13.00 1 28.59 14.50 3 34.71 27.00 5 23.25 16.00 The improvement in the tensile properties arises from several factors.

Aspect ratio of crack is one of key factors of fatigue strength prediction in engineering design and civil structures using fracture mechanics.
Introduction While it is very important to detect crack size and shape in civil engineering, it is hard to measure their precise shapes and/or mechanical factors.
Using their geometry approximations, we can evaluate various properties of fatigue phenomena.
Keer, ‘Stress intensity factors for cracks of arbitrary shape near an interfacial boundary’, Engineering Fracture Mechanics, 1987, 21, (1), 27-41
Takase, ‘Stress concentration factors for round and flat test specimens with notches’, International Journal of Fatigue, 1995, 17, (3), 163-178.

And its drip molding is compaction, high mechanical property; little machining, long mould life and can make complex configuration, environment protection, energy conservation, high efficiency.
Interaction: Choose two factors to analysis their interaction effects, make the interaction table.
Three problems could be solved by Orthogonal Experiments: (1)　Analyze the relationship between the factors and the index, and find how the factors affecting the index
(2)　Analyze the primary factor and secondary factor affecting the index, find out the primary factor in many quotes influencing index, namely taking the main contradiction
(3)　Seek for the combination of the factors for the optimized index.

The strength of soil is one of the important soil mechanical properties.
SWCC of an unsaturated silty sand Essentially, the difference between the unsaturated soil and saturated soil is the existing of matrix suction, which is the critical index controlling the shear strength of unsaturated soil, affecting the mechanical properties of unsaturated soil directly.
As a result, the SWCC is crucially important to the mechanical properties of unsaturated soil.
Table 1 shows the basic physical properties of soils.
The decreasing of suction effect area and (a) moisture content30% (b) moisture content 20% Fig.5 Microcosmic structure of the soil samples the increasing of suction formation of two growth and decline factors affect the shear strength of unsaturated silty sand.

The adsorption parameters affecting microspheres adsorption quantity, such as the concentration of spiropyran solution and adsorption temperature, were studied in detail.
In dispersion polymerization, dispersion medium is one of the key factors to affect polymer microspheres monodispersity, which directly affects the occurrence of phase transition [7].
The photochromic properties of photochromic microspheres.
After the photochromic microspheres were irradiated with xenon lamp for 10min, they still had good photochromic properties.
On the contrary, after samples were irradiated with xenon lamp, the sample 2 exhibited better photochromic properties.

In addition, it is not easy to perform consistent tests under different loads nor compare the results due to impacts brought by geometric properties of specimen.
Aspects of fatigue crack initiation and propagation behavior that vary depending on different experimental factors were examined.
This material is mainly used frame and suspension arm of automobile, because of its good press processing and welding properties.
The chemical compositions and mechanical properties of experimental materials are presented in Table 1 and Table 2.
All in all, we could confirm that the experimental factors used in this test had a significant influence in the initiation and propagation behavior of fatigue crack, while those factors had a minor impact on the macro crack propagation path.

SiO2) to increase mechanical and durability properties, Nano Titanium Oxide (n.
Graphene compactness reduces the water permeability without affecting its breathability due to an excellent vapor permeability.
Study of mechanical properties and early-stage deformation properties of graphene-modified cement-based materials.
Hydrogen bond networks in graphene oxide composite paper: structure and mechanical properties.
Membrane fouling in algal separation processes: a review of influencing factors and mechanisms.