Search results

Parallel to this, a first suitable FE-modelling of the analysed coatings is presented, with the aim of studying frictional properties and mechanical load of hard thin films.
The material properties for ABS, PA6 GF 30, high-speed steel and the implemented thin coatings are shown in Table 2.
Since the mechanical properties of titanium nitride are comparable to the ones of the investigated hard thin layers, this ratio is considered as valid for them too with a certain approximation.
In order to calculate the µplastic-PVD values for the investigated coatings, it is possible to focus on the frictional properties of high-speed steel.
Wenke, Determination of the fatigue properties of multilayer PVD coatings on various substrates based on the impact test and its FEM simulation, Thin solid films, 308/309 (1997) 315-322

However, Permeability is known as a characteristic of concrete which can be considered as an important factor in concrete durability, because the problems relevant to concrete durability are closely related to the concrete permeability.
Permeability is an essential and important index for concrete durability, which measures the difficult degree of a gas, liquid or ion permeate, proliferate and move in concrete with specific viscosity under a pressure gradient, affected by pressure, chemical potential or electric field.
Experimental Method （1）Experimental method of concrete mechanical property [3].
There are lots of factors influence concrete impermeability and gas-proof, especially water cement ratio.
Summary Concrete impermeability grade and gas-proof property improve with the increasing of strength grade, and concrete gas-proof property improves with the increasing of impermeability grade.

., blade tip erosion, and thermal fatigue cracks) to components, especially those under severe thermo-mechanical and corrosive conditions are unavoidable.
Laser cladding technology has revealed as a multi-purpose tool with numerous applications in surface engineering, such as repairing damaged molds used in enhancing service life in marine engine valves and turbine blades [1], improving wear behavior [2] or mechanical and electrochemical properties of mild steel [3], and is an advantageous process for selective improvement of the corrosion resistance of In718 superalloy.
The thermo-physical properties of In718 were allowed to vary with temperature and phase state of the material during the simulation.
Effect of Marangoni force On the surface of the melt pool, there exists gradient of surface tension due to large temperature gradient. as one factor of driving fluid flow, this gradient of surface tension may affect the flow pattern of molten metal in melt pool.
Li, Mechanical and electrochemical properties of multiple-layer diode laser cladding of 316L stainless steel, Appl.

Natural gas purification to remove carbon dioxide (CO2) using efficient separation technology is essential due to its corrosive properties which will damage the pipeline and consequently affect the entire processing environment.
The hard polyamide segments give mechanical strength and the flexible polyether segments provide high permeability caused by the ether linkage that supplies higher chain mobility [9].
The use of a low concentration of CNT as an inorganic filler can substantially increase the mechanical strength of polymeric materials [11].
[3] Robeson, L.M.J.J.o.m.s., Correlation of separation factor versus permeability for polymeric membranes. 1991. 62(2): p. 165-185
[11] Coleman, J.N., et al., Improving the mechanical properties of single-walled carbon nanotube sheets by intercalation of polymeric adhesives.

Several studies have verified that moisture can modify the mechanical properties of some reinforced polymers [11-17].
The purpose of the present work was to examine the influence of water absorption on the mechanical properties of carbon fiber reinforced polymers.
Two kinds of test were performed in the dried samples in order to determine the influence of the water absorption cycles on the mechanical properties following the ASTM D 638-90 and D 5045-96.
Mechanical properties are dramatically affected by the water absorption cycles.
Newman: Composite materials technology processes and properties (1990), p. 237 [10] D.C.

The joints processed at 1000 °C using Nb interlayer were poor in mechanical properties due to the presence of FeNb intermetallics.
Mechanical properties of DCJs processed using 4-MPa bonding pressure at 875 °C for different bonding time interval.
Fu, Microstructure and mechanical properties of bio-inspired Ti/Al/Al-Cf multi-layered composites, Adv.
Yang, Joining of graphite to copper with Nb interlayer: microstructure and mechanical properties, Adv.
Wu, Microstructure and mechanical properties of sputter deposited Ni/Ni3Al multilayer films at elevated temperature, Appl.

Powder metallurgical Mo-Cu alloys exhibit excellent physical property, high thermal and electrical conductivity, low and alterable thermal expansion coefficient, etc.
The mechanical properties of these alloys are affected by the composition, strain history and the microstructure resulting from the thermo-mechanical treatment imparted before the final use[6].
The Zener-Hollomon parameter is the strain rate factor which is compensated by temperature.

There are two main demanded properties of these steels, namely a good resistance against both the creep and the high temperature oxidation.
ACT is a low-cycle thermal-mechanical fatigue procedure executed on a Gleeble physical simulator.
To check ability of ACT for testing material creep properties the parallel CCT and ACT tests were performed on the samples machined of trial dissimilar weld joint of steels F and FB2 assigned for industrial production of welded turbine rotor and their results were compared.
The results of ACT tests can be given as the creep strength factor (FACT) and converted to the lifetime at the test temperature and normalized stress (100 MPa), as calculated on the principle of accumulated energy to fracture.
The width of the heat affected zones ranges from 3.1 to 3.5 mm on both sides of the weldment.

A great variety of techniques are nowadays used to spray coatings with different functionality and properties for the purpose of surface enhancement.
Introduction A wide class of material science problems and engineering applications rely on enhancing surface properties of various engineering components.
Another way of enhancing the surface properties is achieved through applying thermo-mechanical surface treatments such as shot peening, laser shock peening, water-jet peening, cavitation peening, deep rolling, ultrasound impact treatment, low plasticity burnishing and grit blasting.
For samples with lateral dimension much bigger then overall thickness, taken to be a factor of 10 or larger, edge effects do not affect the uniform-in-plane stress state in the central part of the samples and the plane stress condition is fulfilled with greater accuracy.
Stress Measurements in 0.25 mm Thick WC Coatings WC-Co metal matrix composite coatings are widely used in industrial applications requiring superior mechanical properties, low friction coefficient, high wear resistance, toughness and chemical stability within a range of temperatures.

The superplastic flow in tetragonal zirconia polycrystals stabilised 3mol% Y2O3 (3YTZP) is strongly affected by the dopant cations, which segregate at the grain boundary.
Introduction Because of excellent mechanical properties tetragonal ZrO2 stabilised 3mol% Y2O3 (3Y-TZP) [1] is a promising structural material, but at room temperature this ceramics is hard and brittle (similarly as other ceramics) and hence difficult for mechanical treatment.
It causes that pores are created in the ceramics and mechanical properties of obtained elements make worse.
The bulk Db and grain boundary Dgb diffusion coefficients were calculated respectively from regions 1 and 2 using the equations (1,2) from diffusion theory for instantaneous source boundary condition (thin layer of deposited tracer) [12,13]:1 2 ln 4 −       ∂ ∂ −= x c tDb (1) where: t - annealing time, x- depth, 3/5 5/6 2/1 ln 31.1 −     ∂ ∂ −      = x c t D sD b gbd (2) where: s - segregation factor (=1 for self-diffusion) d - the grain boundary width (= 1nm) A plot of lnc vs. the square of the depth yields a straight line corresponding to region 1 as shown in Fig.2a.
Parameters of Arrhenius equations from Fig.3 dopant - Al2O3 SiO2 MgO spinel GeO2 TiO2 D0b [m2/s] 5x10-8 0.3 4.3x103 2,2x10-5 0.5 7.8x10-4 6.4x10-11 D0gb [m2/s] 2.1x102 6.5x102 1,2x109 0.1 3.6x104 0.5 1.1x106 Qb [J/mol] 312 530 668 394 540 453 212 Qgb [J/mol] 534 526 721 397 582 435 643 where: D0b and D0gb are preexponential factors respectively to bulk and grain boundary diffusion, Qb and Qgb are activation energies respectively to bulk and grain boundary diffusion.