Search results

Introduction and state of the art Titanium alloys present many interesting mechanical properties (such as very high strength to weight ratio, high toughness, biocompatibility and good corrosion resistance) that promote the use of these materials not only in the aerospace industry, but also for bio-medical applications and for the chemical and oil & gas industries.
Furthermore, the mechanical properties of the as-received materials can be considered quite homogeneous along the bar diameter, since the material is annealed and since a micrographic analysis has shown that the microstructure is substantially uniform across the cross section of the bars (Fig. °1).
In Table 2 the properties of the tested inserts are listed.
Temperature curve for the three inserts Results and discussion In this section the effects of the investigated factors are analysed and critically discussed.
In a way similar to what already shown with the aid of Table 5, the statistical significance of the factors has been tested with F-tests.

At present, Mg-Gd-Y-Zn-Zr alloys with significant mechanical properties due to the existence of long period ordered phase (LPSO phase) in their microstructure have become the focus of rare earth magnesium alloys because of their remarkable mechanical properties [5-8].
It can be seen from the characteristics of the flow stress curve shown in Fig. 2 that the factors affecting the rheological behavior of the compression-torsion deformation are temperature, strain rate and strain.
Zhang, The intrinsic effect of long period stacking ordered phases on mechanical properties in Mg-RE based alloys, J.
Zhang, The intrinsic effect of long period stacking ordered phases on mechanical properties in Mg-RE based alloys, J.
Yuan, Microstructure development and tensile mechanical properties of Mg-Zn-RE-Zr magnesium alloy, Mater.

The Newton iterative algorithm is applied to calculate the modified formula, and the mechanical fatigue life of piston pin seat is obtained.
It endures cyclic heat and mechanical loads at work.
The investigations previous indicated that heat load was the major factor to cause ablation and heat crack of the piston head, and mechanical load was easy to bring crack at piston pin seat.
Although the overall structure is at the elastic state, the stress concentration point has developed into plastic state, and the existence of the plastic strain makes the stress-strain properties relatively complex.
Especially for low cycle fatigue and few high cycle fatigues [1], the plastic strain becomes the main factor to affect the fatigue life.

In this study the damping property of the R-Rubber composites were tested in the dynamic mechanical analysis (DMA).
But even a tiny amount will affect the quality.
However it decreases the tensile strength yet and the viscoelastic properties of rubber are invalid just as the filler [7].
The dynamic mechanical properties of various binary R-Rubber/AO2246 systems were investigated by DMA, so as to illustrate the possibility of expanding the application of textile reclaimed rubber to other fields.
A possible explanation is that the formation of intermolecular hydrogen bonding due to the right amount of AO2246 crystallizing contributes to improve the mechanical properties of R-Rubber/AO2246 blends, especially the strength and toughness.

Within a certain scope, increasing ignition timing angle appropriately can improve property of combustion.
All these results can help to optimize the parameters that affect the combustion, and provide certain reference for the further study blast-furnace gas engine.
And it is based on the following assumption: (1) the gas injected into the cylinder is ideal; (2) the pressure and the temperature of the environment keep unchanged; (3) the initial conditions of each cycle are the same; (4) there are no leakage and disaffirmation factors; (5) the mixture is even in the process of combustion [4].
Basic equation The operation process in the cylinder is rather complicated, including physical, chemical, mechanical elements and so on.
Within a certain scope, increasing ignition timing angle appropriately can improve property of combustion.

And low temperature toughness, the low temperature resistance to brittle failure of the ability to affect the safety of the most important factor in service.
Therefore, LPG storage tanks at low temperature toughness of welded joints of tank safety as one of the important factors.
The chemical composition and mechanical properties of experimental steel.
And the mechanical properties is shown in Table 2.
For example, the cause of fracture, fracture properties, fracture mode, fracture mechanisms, fracture toughness, stress fracture process and crack propagation rate, etc.

The shock stress wave however is a typical nonlinear wave, several hundreds of MPa in amplitude, much stronger than the thermoelastic stress wave, and has a strong impact on materials structure and properties far beyond the heat-affected zone.
Significant enhancements of mechanical and tribological properties have been observed, not only on the treated surface and sub-surface layer but also at depths of hundreds of micrometers.
Pogrebnjak et al. then studied extensively the structure and properties of the materials modified by this technique [3-7].
The temperature and stress fields are the main factors that determine the state and properties of the beam-affected zone.
According to the above simulation, the significant enhancements of the mechanical and tribological properties observed at depths of hundreds of micrometers are clearly due to the shock thermal stress impact.

The long-term corrosion resistances for the carbon steels have been investigated under high temperature pressurized water atmosphere, in the conjunction with the analysis of nondestructive properties by the ultrasonic wave.
The mechanical properties of carbon steel suffered from the corrosion cycle were investigated by a tensile test, attaching an acoustic emission sensor on the test sample.
The wall thining of carbon steel pipe was greatly caused by the flow-accerlerated corrosion (FAC) in the environmental atmosphere exposed to the flowing water or the wet steam. [4] The majority of R & D research for the corrosion damages of carbon steels was mainly focused on the evaluation of mechanical properties in the various operating environments.
Especially, the effect of corrosion cycle on the mechanical properties of carbon steels was examined, in the conjunction with the analysis of corrosion damages by the ultrasonic wave and the acoustic emission techniques.
In order to investigate the mechanical properties of carbon steels suffered from cyclic corrosion tests, the tensile test was conducted at the room temperature.

Because of its special material properties, the processing efficiency is low and the processing cost is higher.
In addition to material properties of the drill bit, the structure and geometric parameters size of drill bit are the key factors to affect the performance of twist drill [2].
China Mechanical Engineering Vol.11 (2000), p.292 (In Chinese) [7] Y.D.Chen, H.D.Jiang.
Mechanical Engineer Vol.12 (2007), p.147 (In Chinese) [9] G.L.Ma, Q.X.Cao.
Journal of Henan Mechanical and Electrical Engineering College Vol.10 (2002), p.39 (In Chinese)

Using the material density, the adhesive selection and the foam agent modification as main factors, and the cushioning properties as index, the molding process was optimized.
Meanwhile the mechanical properties were also investigated.
Sunflower stalk pith cushioning materials of biomass materials have been pre-treated for more than 24 hours and then for buffering properties and bending strength test.The above process can be illustrated as Figure 1 as follow.
In ensuring the cushioning properties of materials under the premise of the specimen density is 0.10g/cm3, MOR is 12.56Mpa.
The biomass obtained cushioning packaging material with good cushioning properties.