Search results

This article analyzed and summarized the dangers and the factors of sour gas corrosion.
Factors influenced hydrogen sulfide stress corrosion cracking Factors influenced hydrogen sulfide stress corrosion cracking includes two sides: environment factors and material factors. 4.1 Environmental factors Environment factors mainly includes: H2S concentration, pH value, temperature and working stress. 1）H2S concentration：The total amount of hydrogen in the alloy increased with the increase of H2S concentration, shorten the time of occurrence of hydrogen sulfide stress cracking.
Besides the factors above, CO2 concentration, Cl- concentration and types of additives, such as types of drilling fluid, types of inhibitor are likely to affect the SSC sensitivity of the material. 4.2 Material factors Material factors mainly includes: hardness, microstructure, chemical composition, cold work and so on. 1) Hardness: Hardness is an important factor of metallic materials’ SSC.
Material factors are basic factors to affecting the hydrogen sulfide stress corrosion cracking.
Table 3 was the properties of sour service drill pipe [13], these drill pipe have a significant breakthrough in the microstructure and hardness performance.

It is pressed for time to expand our study on pelton turbines, especially for the factors affecting silt erosion of inner wall of pelton buckets.
Padhy[7、8] discussed the factors, such as sediment shape, size and concentration and their erosion on buckets.
Shrestha [9] studied solid-liquid two-phase flow’s motional properties in pelton turbines and thecomputational analysis of pelton bucket tip erosion.
From all the discussions laid before, we got the main influencing factors for the silt erosion on inner wall of turbine buckets.
As there exist direct relationship between sediment concentration and size, the two factors work together to determine erosion level.

On the question of fatigue and degradation caused by bending-over-sheaves, the available research [6,7] mainly focus on the effect of tension, diameter ratio of sheave to wire rope and contact conditions of wire rope with sheave on bending fatigue life, the factors that may bring wire rope mechanical damage, such as the fleet angle and angle of wrap and so on, still need further study.
Mechanical Damage of Wire Ropes When wire rope is bending over sheaves, in addition to the fatigue damage caused by bending, mechanical damage will be affected by fleet angle and angle of wrap as the structural specificity of wire ropes, the damage results in degradation of the quality and influence of the fatigue life of wire ropes. 1) Damage caused by fleet angle In general lifting mechanical design specification, the fleet angle is limited when wire rope is running on and off sheaves.
Angle of wrap can also cause damage to wire rope, and the size of angle affect the degree of damage, thus affect the fatigue life of wire ropes.
The damage mechanism of angle of wrap is related to the geometric properties of wire rope.
When the wire rope is bending over sheaves, the wire will be damaged and the shape of wire cross-section will change because of the impact of various factors such as fleet angle and angle of wrap, the contact and extrusion between wires and between the wire surface and the groove surface.

Consequently, it improved physical and mechanical properties of the binderless particleboard produced.
Effect of pretreatment condition on physical and mechanical properties of panels.
The improved MOR, IB and WA values could be related to the above mentioned factors.
Steam explosion pretreatment conditions have a significant influence on the physical and mechanical properties of the binderless panels.
Gothandapani,:Mechanical properties of coir particle board.

The best choice to use the correct properties is that we measure them by ourselves.
A great number of experimental techniques have been developed to determine material properties.
The static elastic properties are determined from the stress-strain curve.
Table 1 shows the material properties of the specimens.
The main factors affecting the use of the measured vibro-acoustic signals which is the noise content have been eliminated by using Z-stem filtering technique.

This range of reduction was selected to optimize the mechanical properties of the hot rolled material.
This non-uniform distribution can lead to the formation of uneven grain structures, which may negatively affect the mechanical properties of the material.
With the increase of the number of passes during hot rolling leads to an increase in the mechanical properties of AZ31 alloy, such as tensile strength and hardness.
Therefore, the number of passes must be carefully controlled to balance the desired mechanical properties with the need to maintain ductility and toughness.
Zhu, The effect of Ca and rare earth elements on the microstructure, mechanical properties and corrosion behavior of AZ91D, Materials Science and Engineering.

It is known that the influence of GBs on mechanical properties becomes considerable when the grain size is below 500 - 1000 nm.
Zhang, Structure and mechanical properties of nanostructured Al–Mg alloys processed by severe plastic deformation, J.
Valiev, Nanostructure and related mechanical properties of an Al-Mg-Si alloy processed by severe plastic deformation, Phil.
Matthews, Mechanical properties of nanocrystalline nickel produced by electrodeposition, Nanostr.
Langdon, Factors influencing the flow and hardness of materials with ultrafine grain sizes, Phil.

The relationship between the mechanical properties of trabecular bone in tension and compression was investigated by several researchers [5, 6, 7, 8] .
Most properties depend strongly on the density of the foam structure and the properties of its material matrix.
The relative density is the most important factor affecting the length of the plateau during compression.
Goldstein, The mechanical properties of trabecular bone: Dependence on anatomic location and function, J.
Leuven, Mechanical properties of bone, ICB Dent (2003)

Factors affecting the FLDs prediction, such as imperfection intensity, initial texture, strain rate sensitivity and crystal elasticity will be taken into account.
The concept of forming limit diagrams (FLDs) was introduced by Keeler and Backofen [11] when conducting a biaxially stretched experiment and they found out that the material properties have great influence on the strain distribution in biaxial stretching test of sheet metal.
Now a common acceptance has been reached that forming limits of sheet metals are influenced by several physical factors, the most important ones of which are material work-hardening, strain rate sensitivity, plastic anisotropy (texture), the evolution of structural damage, in-plane and out-ofplane deformation, and changes of strain path.
[3] Bassani, J.L., Yield characterization of metals with transversely isotropic plastic properties, Int.
[16] Marciniak, Z., Kuczynski, K. and Pokra, T., Influence of the plastic properties of a material on the forming limit diagram for sheet metal in tension, Int.

The modification of structural characteristics influenced the mechanical properties of TRIP steel.
The amount and stability of the retained austenite controls mechanical properties of TRIP steels [5].
The mechanical properties at room temperature were determined by tensile testing.
Mechanical properties of TRIP steel are known to depend strongly on the composition of structure.
- Mechanical properties provide evidence that increased RA volume fraction is an influential factor, which increases the plasticity and supports strengthening in TRIP steel