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And optical fiber Bragg grating sensor, due to its improving properties such as small size, light weight, outstanding anti-jamming capability as well as characteristic of wavelength division multiplex and wavelength encoding, can be used to monitor the strain and the damage of the aviation and aerospace structures.
Fig. 1 A specimen and experiment device In this paper, the fatigue properties of the bare optical under static, dynamic and cyclic loads have been tested.
When the optical fiber is buried in the matrix, we reckon that the separation between the wrap and the coating will not affect sensory property.
Hence the mechanical properties of wrap and core of fiber determines whether sensory property of optical fiber is applied.
Blocking materials Static fatigue test The fatigue property of brittle materials is characterized by the subcritical crack growth V, which can be calculated by the stress intensity factor KI: (1) Where A is the constant and n the fatigue life index

This paper presents a discussion on 3 topics that are germane to damage diagnostics in output only systems, namely: 1) the usual assumption of stationarity of the input in the identification 2) the computation of proper scaling factors for the identified modes and 3) the establishment of a map between changes in synthesized flexibility matrices and spatial location of damage.
The approach presented here, therefore, is based on a perturbation to the mass properties.
This section does not offer conclusive statements regarding the accuracy of the formulation presented because to do so requires a study where all the factors that affect the error are considered.
Percent error in modal scaling constant computed with eqs.12 and 13 for a 10-dof shear beam with uniform properties (the perturbation is two equal added masses at dof 6 and 10, the magnitude of the perturbation is variable).
"Sensitivity-based operational mode shape normalization", Mechanical Systems and Signal Proc., Vol.16 (5) pp.757767

Erosion and corrosion predominantly affect the efficiency and life of machinery used in the chemical and mining industries [4].
Improving operational properties and wear resistance of essential machine parts is acute for modern machine engineering.
Among the works devoted to technological methods of improving operational properties the ones aimed at improving stability of cutting processes, materials and coatings should be mentioned at steel [7-9].
Owing to the combination of good mechanical properties and excellent corrosion resistance, steel is widely used in mining machinery [10, 11].
Among the commercially available alloys, steels are well-established candidates for applications where good mechanical properties and high corrosion resistance are demanded.

As chitosan membranes have been found to have excellent film-forming properties and high mechanical strength, they are suitable for haemodialysis, ultrafiltration, reverse osmosis, pervaporation, fuel cell and adsorptive membranes.
Membranes from pure chitosan cannot offer sufficient mechanical stability for application in flow processes.
In the current study, silica and PEG were blended to improve physical and mechanical properties of chitosan membranes in adsorbing copper ion from aqueous solution.
Enhancing hydrophilicity and surface roughness are other possible factors for adsorption improvement by PEG addition.
Therefore, porogens not only plays a key role in information of the porous stucture of the membranes (by phase separation) but also affects the wettability as discussed [7].

Physical property of shrink-fit holder and cutter Fig.1 Structure of shrink-fit holder The material properties of SFH and cutter are in the table 1.
The material properties of SFH and cutter showed in table 1.
Kd is the distributional factor of curve’s slope of ε changed with the d.
Journal of Mechanical Strength. 31(1) (2009)88-94
China Mechanical Engineering. 14(9) (2004) 734-74

A simplified mechanical model in view of concrete component stability problem on fire was established.
To improve the ability of fire resistance of concrete structures, a lot of experimental researches about concrete structures have been carried out at home and abroad, which have provided a solid fire-resistant data base, such as mechanical properties of concrete materials at high temperature, high temperature deformation, high temperature compression strength, high temperature compression deformation, stress - strain curves and other high-temperature properties [2][3].
Obviously, the concrete component high-temperature instability caused by the change of material properties actually is a nonlinear mutation process of inner energy due to the work of the load and temperature.
So the main factor was temperature for K when km was stationary.
So the system balance was affected by fire duration, temperature, load and load characteristic.

However, the study of flexibility and deformation behaviors under various conditions is crucial due to its environmental dependent properties.
Tensile strength and modulus were affected notably.
Elastic and viscoelastic properties of materials were used for comparison purpose.
For UHMWPE, those properties from B.
Lobo : Mechanical and Viscoelastic Properties of UHMWPE for IN-VIVO Product Development, DatapointLabs, Ithaca, New York, USA [3] D.

Cross linked polyethylene (XLPE) are commonly used power cables having high electrical and mechanical properties.
In recent years, various researchers have analyzed the factors affecting the insulation failure of outer shielding layer.
External factors, such as moisture [8] and transportation [9,10] also causes a large potential difference between outer insulation layer and aluminum sheath which in return will cause the insulation failure.
This paper takes the high-voltage XLPE cable as the research object, design experiments to explore the influence of various environmental factors on the white powder generation characteristics of the cable buffer layer, uses the multi-physics coupling simulation software COMSOL to establish the cable model, and analyzes the current density under different concentration of white powder and corrosion time.
Buffer layer failure characteristics, failure mechanism and white powder generation influencing factors, and discuss the failure response methods.

The values of these parameters significantly affect such machining outputs as material removal rate.
A transient thermal analysis assuming a Gaussian distribution heat source with temperature-dependent material properties has been used to investigate the temperature distribution.
The theory is still under research for changes of material properties in micro levels and metallurgical transformation due to the high thermal energy.
The approximate temperature-dependent material properties of En-19 tool steel, which are given to ANSYS modeller, are taken from [18].
For developing the model various important process parameters are taken into account which includes pulse on/off time, material properties, shape and size of heat source and heat energy given as input to the work piece.

The fitting parameters were the coordination number (Ni), the Cu-Cu and Cu-Ti bondlengths (RCu-Cu and RCu-Ti) and the Debye-Waller factors of the Ti atoms.
Sundgren, Structure and properties of TiN coatings, Thin Solid Films 128 (1985) 21-44
VlCek Microstructure and properties of nanocomposite Ti-B-N and TiB-C coatings, Surf.
Le Bourhis, Structural and mechanical properties of IBAD deposited nanocomposite Ti-Ni-N coatings, Surf.
Schell, The structure and the corresponding mechanical properties of magnetron sputtered TiN-Cu nanocomposites, Surf.