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The analysis has been supported by the microstructural studies, thermal analysis and micro-hardness testing performed on the affected main rotor bearing parts.
Upon first observation, it was observed that two of four bearings installed in the main rotor hub assembly had been badly affected with symptoms of fire and mechanical damage.
The performance of ball-bearing also depends on other external factors.
In addition, corrosion of any of the component of ball bearing can significantly affect its integrity.
Mechanical properties were assessed using micro-hardness tester on Vickers scale.

The tensile properties of these samples have been evaluated and the results presented.
The influence of each factor on the tensile properties of braided fabrics has also been analysed and discussed.
The tensile and bending properties of braided reinforced composite rods have been evaluated and the results obtained presented and discussed.
One of the most serious problems affecting concrete is corrosion of the steel armours.
The samples are being produced with more rovings so that the mechanical properties of the material could be improved.

This process is affected by parameters such as : pressure path, geometrical parameters of punch and die, friction between punch and sheet, etc.
HDD is affected by many parameters which include: pressure path, geometrical parameters of punch and die, friction between punch and sheet, etc.
For acquiring mechanical properties, tensile tests were carried out using DIN 50114 standard specifications.
To reduce the calculation time, a speed factor of 100 was used in the simulation [3].
‘‘Development of hydro mechanical deep drawing”.

The density affects most of the physical and mechanical properties of wood composite panels [11–13].
Panel density has been shown to have a considerable impact on flexural properties of wood-based composites [14].
The properties of tested PB composites are as follow: Rm = 0.43 MPa, E = 2.45 GPa.
An interaction (statistically significant) between the studied factors was found.
Bridges, A quantitative study of some factors affecting the abrasiveness of particle board, Forest Prod.

The Composites are difficult machining materials which widely used in aerospace industry due to their excellent mechanical properties.
The thrust force and torque affect the tool life and delamination mostly.
Introduction Composite materials such as fibre-reinforced plastics(CFRP) are extensively used in aerospace, automotive and civil applications due to their excellent mechanical properties.
These properties made them especially attractive for aerospace and civil applications.
Table 1 Assignment of the levels to the factors Level 1 2 3 4 5 Revolution (rpm) 10000 12000 14000 16000 18000 Feed speed (mm/min) 50 80 120 Fig. 4 Schematic diagram of the experiment Results and Discussion The value of the thrust force and the torque from the recorded data were show in Table 2.

This type of distress usually results from the action of moisture leading to the degradation of the mechanical properties of the asphalt mixture and appears in the surface with varied forms such as rutting, cracking, or stripping.
Several factors, including material properties, mixture properties, quality of construction, and traffic and environmental conditions influence the rate of moisture damage in asphalt pavement [1].
Evaluate the effects of air voids and in presence of water on dynamic properties that affect and control moisture susceptibility of asphalt mixtures. 2.
It indicates that the air void content clearly affect the dynamic property in the asphalt mixture.
Harvey, Field investigation of factors associated with moisture damage in asphalt pavement, 10th International conference on asphalt pavement (ISAP), Quebec, Canada, (2006), 691-700

There are a wide range of ceramic coatings that can be applied to metal components in order to enhance their functional properties.
Hardness and porosity are the two main factors that are properties of the above requirements.
Previous literatures show that there are a lot of factors affecting the desired characteristics.
The levels of factors are selected as three based on Taguchi design.
Pang, Structure characterization and mechanical properties of crystalline alumina coatings on stainless steel fabricated via sol-gel technology and fibre laser processing, J.

Stress intensity factors (SIF) presented in the paper were calculated numerically.
Upper and lower balls are immersed in lubricating oil (table 1 presents base properties of lubricating oil).
The upper ball is the silicon nitride test specimen with a pre-existing ring crack (table 2 presents silicon nitride properties).
Base lubricating oil properties Trade name T-9 Producer Nynas AB Properties: Kinematic viscosity (temp. 40°C) 9,13 [mm2/s] Kinematic viscosity (temp. 100°C) 2,3 [mm2/s] Sulfur content 0,01 % Flash point temperature 146°C Table 2.
Stolarski, Factors affecting the wear of ceramic balls, Wear 172 (1994) 191-196

Motivated by high fracture incidence of this particular component, an extensive research program to evaluate the fabrication and maintenance weld repair effects on the structural integrity, mechanical properties and microstructural changes has been developed.
The mechanical properties obtained from smooth flat samples, in accordance with ASTM E 8M, were: 745.97 MPa for yielding stress (0.2% offset); 843.35 MPa for ultimate strength; 655.17 MPa for rupture stress; 9.80% for elongation (in 25 mm length), 0.88 for yielding stress/ultimate strength ratio and 65 HRA hardness in the "asreceived" condition.
Fig. 5 and Table 3 present the principal geometric factors that compose a butt-weld joint, measured by image analysis tool.
The AISI 4130 steel has good mechanical properties, but low elongation and endurance limit when subjected to bending fatigue in the "as-received" condition (not heat-treated). 2.
E., Stress Concentration Design Factors, fifth ed., John Wiley & Sons Incorporation, New York, 1966, 155p [10] Lancaster, J.

To investigate errors caused by gravity, it is essential to figure out the most influential factor.
Introduction The accuracy of a heavy-duty CNC machine tool is determined primarily by the geometric properties of machine tools.
Geometric accuracy is one of the critical factors in determining the machining quality.
And then, further research on the compensation of the key factors can be carried on.
Journal of Mechanical Engineering, 2012(7): 171-179.