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The environmental factors (mechanical, climatic, chemical, biological and radiometric) certainly have a significant effect on the physical and chemical properties of POF, which obviously affects optical transmission performance of POF leading to the changes of lifetime of POF system [7].
Some other mechanical properties can also influence attenuation.
Compared to uses in communication and decoration, the requirements of mechanical properties and fiber diameter must be higher.
Results and Analysis The basic mechanical properties with Instron-4411 tester shown in Table 1 were mean initial modulus, mean deformation at break and tensile strength with corresponding coefficient of variation CVσ. 95% confidence interval of initial modulus, deformation at break and tensile strength were found in Fig. 2-3, respectively.
Table 1 Properties of POFs with Instron-4411 tester.

Shear bond strength depends on various factors including the adhesive properties of the bonding materials, the attachment at the different interphases like the tooth to composite interphase and the composite to bracket interphase, as well as the polymerization of the composite bonding material.
Bond strength determines the amount of force delivered and also affects the treatment duration (2).
The meshed geometry is applied with different material properties for cartical, cancellous, dentine, bracket and resin.
Fig 5 Meshed geometry of the problem with Bracket 2.2 Material Properties The material properties of bone were assigned based on two different procedures: 1) All bone elements were either assigned a Young’s modulus of 14,700 MPa and a Poisson’s ratio of 0.3, thereby representing a homogeneous distribution of bone properties. 2) Different Young’s moduli were assigned to each element individually, based on the morphology of the bone obtained from the CT scans.
The bond strength of bracket -adhesive - enamel system in orthodontic bonding varies and depends on factors such as the type of adhesive, bracket base design, enamel morphology, appliance force systems and the clinician's technique.

Experimental factors take spindle speed, feed rate, cutting depth.
（a）Chipping of the substrate （b）Chipping of the coating （c）Tipping of the tool Fig. 3 SEM micrograph of the removal of mechanical loss of the CVD tool The removal of mechanical loss.
Oxidative wear can affect the tool life, thus reduce the service life of cutting tools.
The removal of mechanical loss and adhesion wear along with the whole process of tool wear.
[9] Hu Zhaoyou: Study on precise complex cutting tool cutting properties of TiN coating (Hanjiang tool factory coating Center)

With the intention of researching suspension's effect on the self-excited vibration of tire, according to the characters of polygonal wear, the twist beam suspension of car PassatB5 was simplified to proper mechanical model in the method of FEA.
The model of polygonal wear is three-dimensional problem; here we consider that the lateral vibration is the main factor in the whole systems.
Assumed Conditions of Modeling The suspension-tire system is so complicated that many affecting factors will cause the simplifying and accuracy of the model.
(3) Ignoring the affecting of instantaneous tire wear to the characters of tire in the mathematical modeling.
Equivalent Mechanical Model of Twist Beam Suspension Twist beam back suspension is the main object in our research, the geometric model of this back suspension has been showed by Figure 1.

The structure of polyureas was characterized and thermal properties were measured by TGA and DSC.
Introduction In the last years, polyurea is one of the most versatile polymer material for their good mechanical properties, utilized in a variety of industrial parts, building materials, adhesives and coatings[1-3].
This fast reactivity leads to the fact that curing of polyureas is not affected by moisture or temperature.
We discussed the main factors to the polyurea properties including formula and reaction conditions.
Thermal properties of these polyurea are shown in Table 1.

Study on High-Frequency Fatigue Properties of PVD AlTiN Coating of Cutting Tool N.C.
Many researches focus on the fatigue properties of coating of cutting tool [5-6], but few researches consider the influence of the high-frequency impact.
The failure mechanism and high frequency fatigue properties of coating under impact have been analyzed.
The research results show that the expansion of radial and lateral crack are determined by indenter radius R, the normal force F, coating and substrate adhesion and mechanical properties of the substrate.
(3)The adhesion strength of coating with the substrate may influence the high-frequency fatigue properties.

First of all we study the properties of a traditional lime mortar, as a reference.
Methods Specimen preparation and rheological properties.
We conclude that the mechanical strength is not particularly affected for its possible use as coating in restoration or rehabilitation interventions.
The results achieved from this research with the aim of getting mortars sufficiently permeable to water vapor but more impermeable to moisture and other climatic factors are promising.
García, Properties, characterization and preparation of halogenated aromatic polyamides.

The transformation of the structure during dynamic alloying leads to a change of the composition and mechanical properties of the matrix material.
Changes in the properties of aluminum alloys occurs at concentration 0.001 – 0.1 % of alloying elements.
Structural elements (channel elements) formed in the matrix material (Al 99.7 %) after dynamic alloying with a stream of SiC powder particles The appearance of new structural elements should affect the mechanical properties of the obtained material.
The Effect of Dynamic Alloying on the Change of Mechanical Properties of Aluminum and its Alloy.
The change in mechanical properties is indirect evidence of a change in the physical properties of the material.

Mechanical properties testing: Mechanical evaluations including hardness, flexural, dynamic mechanical, and creep analyses were performed as following details.
This stage used a five formulations response design which allows for two factors evaluating effects of multiple fillers with a maximum of 20 wt% filler content.
Table 2 The investigations of thermal properties and composite morphology.
Park, Experimental study on the thermal and mechanical properties of MWCNT/polymer and Cu/polymer composites, Appl.
Soares, The effect of dynamic vulcanization on the mechanical, dynamic mechanical and fatigue properties of TPV based on polypropylene and ground tire rubber, Polym.

However, with the present microfabrication techniques, process induced variations of geometrical features and of some material properties are inevitable and this is reflected in undesired variability of the device performance.
Among the causes of such variations there can be enumerated the process temperature variations that can induce surface stresses and affect the lithographic steps, non-uniform application of photo resist, non-uniform distribution of process gases, variation of the diffusion and concentration of the reactant in wet etching, chemical contamination of the wafers, imprecise mask alignment, material properties variations.
During this manufacturing step, due to the high temperatures involved, the material properties (such as Young's modulus) can be affected and present variations.
One simulation loop in a Monte Carlo simulation represents one manufactured device that has a particular set of geometric parameters and material properties.
The lengths of the parallel flexure beams (LBL and UBL) are the following most influential factors and they have a negative sensitivity, which means that an increase of the flexure beams' length would decrease the value of the natural frequency, hence it would reduce the stiffness of the structure.