The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Due to their favourable mechanical properties and low density in comparison to metallic materials, carbon fibre reinforced plastics (CFRPs) have found substantial use in the manufacturing of aircraft parts. One of the drawbacks, however, which hampers more widespread applications, is the poor resistance of the composites to solid and liquid particle erosion. Protective metallic coatings can increase...
Solid particle erosion of steel is a function of abrasive particle properties, target material, erodent velocity, abrasive feed rate, impact angle and the environment. Steel microstructure, which directly influences its hardness and ductility, plays an important role in determining the erosion rate. In this study, the effect of microstructure on the erosion of AISI 1018 (pearlite+ferrite) and AISI...
Previous theoretical studies indicate that the material removal mechanism and the likelihood of particle embedding in solid particle erosion processes strongly depend on instantaneous particle orientation at impact. The present study utilized pulsed laser shadowgraphy to measure the size, shape, and instantaneous orientation distributions of particles within a micro-abrasive jet at various pressures,...
Erosion of surfaces is an on-going industrial problem wherever solid particles are conveyed. The literature reveals very limited data reported for elbow erosion. Almost all data that is available only relates to the elbow extrados, or else provides an overall mass loss of surface material with no information on erosion distribution. A detailed surface map of erosion depth in a standard elbow (90°...
This article introduces a method to mitigate the effects of erosion on the throttle value of managed pressure drilling, a practice that is vital for drilling safety and efficiency. A discrete phase model (DPM) and a semi-empirical material removal model are adopted to predict mass loss and erosion distribution. The corresponding experiment is performed in order to validate the model, and our hypothesized...
Using an Eulerian–Lagrangian approach, numerical erosion modeling of a 90° sharp bend in water–sand slurry flow is performed. The numerical results are validated with experimental data in the literature [1]. Two different sand types, 25µm sharp silica sand and 256µm rounded quartz are used. The carrier fluid velocity is varied from 15.2m/s to 26.2m/s. The total mass loss and local wall thickness loss...
This research work provides information about the influence of Ti2AlC MAX phase coatings on the erosion resistance of Ti6242 alloy. Flat specimens were coated with a 20µm Ti2AlC film using an industrial size magnetron sputtering coater and annealed at 800°C for 1h in vacuum for the formation of the MAX phase. The erosion resistance of the specimens was tested using high-velocity particles at room...
The damage caused by sand erosion is an inevitable problem encountered in the oil and gas transportation system. The elbow is one of most vulnerable fittings of pipelines. For gas flow in elbows, it has been proved that incident solid particles will rebound randomly when they initially impact the wall, and then impact the wall once again with a certain probability, resulting in second collision erosion...
The slurry particle concentration effect on the erosion rate of tool components is a critical factor in the design and maintenance of industrial equipment. The relationship between slurry particle concentration and erosion rate was tested and evaluated at a jet impingement test facility using glass spheres impacting acrylonitrile butadiene styrene (ABS) coupons. Particle concentration ranged from...
Particle embedment may occur in erosion testing, abrasive jet machining, blast cleaning and other industrial processes in which high speed impact of particles on relatively ductile targets occurs. It may strongly affect erosion rates, and lead to undesirable changes in surface roughness. Three-dimensional smoothed particle hydrodynamics (SPH) simulations were used to simulate particle embedment when...
The present work examines the abrasive and the erosive wear performance of WC–12Co microwave clads. Cladding of micrometric and nanometric WC–12Co powders was carried out on austenitic stainless steel substrate using microwave hybrid heating technique. The micrometric clads exhibited the presence of skeleton structured carbides uniformly distributed in the metallic matrix. On the other hand, presence...
The state-of-the-art of the thermal barrier coatings (TBCs), used to protect hot path components from combustion gases, is represented by yttria (partially) stabilized zirconia (YPSZ). Combustion and cooling technology improvements in combination with higher turbine inlet temperature imply that the standard YSZ approaches have certain limitations due to sintering and phase transformations at elevated...
How composites reinforced with plain-weave polybenzoxazole (PBO) fibers were eroded by solid particles was investigated. By evaluating the erosion rates of plain polymers and these composites at various impact angles (α=15–90°), we confirmed that the polymers and their composites were ductile. The relationship between erosion behavior and fabric orientation from an energy perspective was studied,...
Fine particles originating from a mixture of erodent particles or being the residues of broken particles, might retain on the surface of an eroded material by electrostatic field. This results in the presence of a fine third body between an attacking original erodent particle and a material surface during collision that leads to higher and more localised stresses. Hardmetal, alumina, zirconia, Al...
Most previous models of solid particle erosion have assumed the abrasives to be rigid, as opposed to deforming, and have largely ignored the effect of particle fracture and fragmentation. However, since particle fracture dissipates kinetic energy and may lead to secondary impact, it can affect the resulting erosion rate and associated mechanisms. In this paper, double pulsed laser shadowgraphy was...
The accompanying paper presented and verified a numerical model to predict the fracture of silicon carbide particles impacting Al 6061-T6 aluminum alloy. In this work, further experiments under conditions that were less likely to cause fragmentation, and for a smaller particle size, confirmed the model׳s predictive capabilities. The model and double pulsed laser shadowgraphy were then used to study...
Solid particle erosion in elbows is a prominent problem encountered in hydrocarbon transportation pipelines, especially for dry gas and gas–mist flows. There is great difference in flow conditions between model experiments and engineering. A set of similarity criteria is proposed to analyze the corresponding relationship between engineering conditions and that in laboratory tests. The similarity criteria...
WC–Co–Cr thermal spray coatings are possible replacements for hard chrome plating on aircraft landing gear because of their superior wear resistance and environmentally friendly properties. In this study, four HVOF spray WC–10Co–4Cr coatings were deposited. During deposition, WC (tungsten carbide) particles were mixed into the coating. These included two types of single particle size distributions...
Slurries conveyed in conduits generate erosion caused by particle impacts on the walls. Those impacts result from the average velocity and the turbulence of the carrying liquid. We investigate the erosion and relevant flow features, when the dilute slurry passes from the inner to the outer annulus through four equally spaced rectangular apertures on the periphery of the tube dividing these two conduits...
In this work, a new structural hybrid fabric reinforced polyetherimide composite was prepared using a solution impregnation method. The effects of fabric orientation, i.e., the angle between the projected line of the impact path of the solid particle on the specimen surface and the axis of the polybenzoxazole (PBO) fibers, and weft density on the erosion behavior of the prepared hybrid composites...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.