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On hot air chamber, folding endurance is highly affected by heat ageing more than the other mechanical properties.
The increment of chamber temperature gave more elasticity properties, that made the hinges area soften.
From Fig. 5 and 6, the result shown that the temperature rank first (most affecting factor) in humidity and hot air environment as compared with other factors.
The next most affecting factor os breaking time, followed by motor speed and relative humidity.
These affecting factors are related to the folding numbers obtained in this experiment.

A research shall be conducted on the casting structure and mechanical properties at room temperature of this magnesium alloys and the effect of main alloying rare earth elements of Y, Gd and Nd is researched through analysis on the test data of mechanical properties.
The automotive drive system operating at high temperature and engine parts require the magnesium alloy to have good comprehensive mechanical properties at room temperature and stable mechanical properties at high temperature for long time.
In meanwhile, its mechanical properties are also guaranteed.
However, it is seen from Table 2 that Gd has an effect on the mechanical properties of alloy system but it is difficult to see the effect of Nd on the mechanical properties of alloy system since the design range of mass fraction of Nd added is small.
In meanwhile, after the casting second phase is discomposed, there is a large number of uniform and dispersed spot phases to precipitate which are an important factors of strengthening.

The Composites are difficult machining materials which widely used in aerospace industry due to their excellent mechanical properties.
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.
The machinability of fiber reinforce plastics is strongly influenced by the type of fiber embedded in the composites and its properties.
tool Fixture Dynamometer Work tabel Strain gauge Acquisition card computer Cutting speed Fig.3 Schematic diagram of the experiment Table 1 Assignment of the levels to the factors Level 1 2 3 Revolution (rpm) 10000 14000 18000 Width of cut (mm) 1 3 5 Feed rate (mm/z) 0.01 0.02 0.03 Results and discussion The values of the milling force from the recorded data were show in table 2.

It is essential to identify the hazardous and harmful factors in CCPP, and carry out effective safety risk assessment [1].
Risk factors can cause casualties to human or unexpected property damage.
Research results at home and abroad show that creep, oxidation and corrosion are the major factors affecting the life of units for continuous load-operation units, while thermal-mechanical fatigue and corrosion are the main factors affecting the life of units for peaking load-operation units.
These factors can lead to boiler Water Pipe Bursting Accident, so the probability of the accident and the degree of risk is higher, fault tree analysis method is used to analyze the accident.
The hazardous and harmful factors in process are identified.

Engineering ceramic are special hard and brittle materials, their surface properties are very sensitive to the state of the surface stress, the compressive residual stress can be improved part strength and surface properties in a certain extent, especially can increase breaking strength, tensile residual stress in the opposite role.
Many factors affect the residual stress in the ceramic grinding process, summed up in: ① grinding parameters like grinding depth ap, wheel speed Vs workpiece feed speed Vw. ② wheel like abrasive type, particle size, concentration, binders, trimming mode. ③ grinded material like hardness, brittleness, grain size, porosity. by test of grinding parameters, grinding wheel type, material and other main effect factors on grinding residual stress in engineering ceramics surface , results were carried obtained: (1) Al2O3 ceramics is grinded with diamond grinding wheel, when the grinding depth ap is less than 50μm, residual compressive stress increases with increasing grinding depth.
under repeatedly polishing, big residual stress interaction depth can produce good specimen strength and surface properties.
In the various affecting factors formation of residual stress, grinding temperature are the main factors of the influence of surface residual stress values and the role of depth, thermal stress caused by grinding temperature make the residual stress values and the role of depth change, thereby reducing the ceramic parts breaking strength.
Conclusions Residual compressive stress can produce better mechanical strength and surface properties, and the residual tensile stress in the opposite. the choice of parameters in the grinding process effect on the residual stress,the influence of grinding depth ap on residual stress is maximum, since the grinding temperature has a great influence on the residual stress, so reducing grinding temperature is conducive to produce a beneficial compressive residual stress on the surface properties.

The Effect of Partial Pressure of Nitrogen on Coating Properties The difference between nitrogen partial pressure and other influencing factors is that it is one of the constituents of nitrogen-based coatings.
Due to the fact that it can change the composition of nitrogen in nitrogen-based coatings, the influence of nitrogen partial pressure affects their phase composition and tissue properties.
However, it is vital to find the process parameters for a coating preparation by combining various influencing factors, researchers need to optimize them through computer simulations or experiments.
Lee, Effect of cathode arc current and bias voltage on the mechanical properties of CrAlSiN thin films, Surf.
Qiu, Effect of arc current on microstructure and mechanical properties of Cr coatings deposited by multi-arc ion plating, Rare Met.

The cyclic temperature and the external load are the key factors which influence the strength of the welded joint specimens, while the cyclic period has a minor effect in thermal cycling conditions.
As illustrate in Fig. 2, the thermal cycling process cause decrease of the tensile properties in all the four test groups.
It can be concluded that the cyclic temperature and the external load are the most important factors influencing the strength of the joint specimens in thermal cycling conditions.
Moreover, all the welded joint specimens fracture at its heat affected zone (HAZ) during the tensile tests.
The following conclusions have been derived: 1) The tensile strength of the 5A06 welded joint decrease under combined mechanical and thermal cycling conditions. 2) The cyclic temperature and the external load are the key factors influencing the strength of the welded joint specimens in thermal cycling conditions, while the cyclic period has a minor influence on the strength. 3) The micro-voids nucleation and growth around the particles at HAZ is the micro-mechanism cause the strength deterioration under thermal cycling conditions.

Effect of Mineral Composite Fillers on Properties of Man-made Plywood Hongxia Shaoa, Qingguo Tangb, Jinsheng Liang and Yan Ding Institute of Power Source and Ecomaterials Science, Hebei University of Technology, Tianjin, China ashxyao123@163.com, bqingguo_tang@163.com Keywords: plywood, urea formaldehyde resin, attapulgite, free formaldehyde, bonding strength Abstract.
Attapulgite mineral powder as raw material, through surface modification and composite of various mineral processing, the effect of modifier dosage, composite powder filler ratio on the mechanical properties and formaldehyde emission of the plywood which is bonded by filled urea-formaldehyde resin were investigated.
Cem [4] studied the influence of borax pentahydrate on the properties of the Urea-formaldehyde.
Results and Discussion 3.1 Changes of synthetic adhesive viscosity The changes of synthetic adhesive will affect its solidification property.
Effects of flour, talcum powder, kaplin, attapulgite, different modified attapulgite, modified composite mineral filler and other powder filler on the properties of the plywood are shown in Table 1.

Introduction High-strength low-alloy steel (HSLA) is a type of alloy steel that provide better mechanical properties and/or greater resistance to atmospheric corrosion than conventional carbon steel.
These types of steel vary from other steels in that they are made to meet specific mechanical properties rather than a specific chemical composition.
The tensile and impact properties of HSLA steels are affected by many factors, such as the element composition, element content, microstructure, manufacturing process, test method, experimental temperature and so on [3~5].
Among which, the experimental temperature is a very significant factor, because that the steels represent various property changes at different temperature.
Fig.1 The mechanical properties of the specimens tested at different temperature (a) Yield strength and tensile strength, (b) Elongation and reduction of area From Fig.1a, it can be observed that the yield strength of the specimens tested among the temperature range of 300°C and 400°Cwere higher than that tested at room temperature.

Al-Si-Cu alloy is seldom use in its untreated state due to its relatively poor mechanical properties.
Mechanical properties are principally controlled by the cast structure; therefore structural factors in Al-Si are more important for study.
A number of factors define the metallurgical structure in Al-Si castings and that determines the properties.
Heat treatment is one of the major factors used to enhance the mechanical properties of heat-treatable Al-Si alloys, through an optimization of both solution and aging heat treatments.
Effect of Different Heat Treatment on Mechanical Properties Mechanical properties of Al-Si alloys are strongly dependent upon an appropriate heat treatment technology.