Abstract
Erosion is a serious concern for machinery dealing with particle-laden fluids. For protection against erosion, coatings are usually recommended. Laboratory experiments are conducted to evaluate the erosion rates of these coatings. Alternatively, one could consider the use of modeling and simulation to predict the erosion rates. Although several models are available in literature for bulk materials, there is limited work reported in this direction for coatings. In present work, several models from literature were evaluated for their ability to predict the slurry erosion of coatings. A model based upon contact-fracture theory (CFT), proposed in present work, was also evaluated. Another variant of this model considered the effect of splat size. It was observed that none of the existing models evaluated in the present work could predict the erosion rates of the coatings. The proposed CFT model was able to predict the erosion rates with reasonable accuracy, whereas another variant of this model based upon splat size was observed to be inappropriate for predicting erosion rates of coatings. Possible reasons for the observed disparity are discussed.
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Abbreviations
- A(h):
-
Area function
- C, D :
-
Constants
- E :
-
Young’s modulus (Pa)
- E * :
-
Equivalent Young’s modulus (Pa)
- E r,m :
-
Erosion rate (mm3/s) or (g/g)
- H :
-
Hardness (Pa)
- I 1, I 2 :
-
Constants
- K c :
-
Fracture toughness of target material (Pa√m)
- K w :
-
Coefficient depending upon material parameters
- P :
-
Impact force (N)
- Q :
-
Volume loss (m3)
- R p :
-
Radius of erodent particle (m)
- U KE :
-
Kinetic energy (Nm)
- V :
-
Impact velocity of erodent (m/s)
- W ind :
-
Work of indentation (Nm)
- a :
-
Radius of contact/plastic zone (m)
- b :
-
Depth of plastic zone (m)
- c lat :
-
Length of lateral crack (m)
- d :
-
Diameter of erodent particle (m)
- e :
-
Constant
- f :
-
Coefficient of friction
- h :
-
Indentation depth (m)
- m :
-
Mass of erodent (Kg)
- m′:
-
Constant
- \(\dot{m}_{a}\) :
-
Mass flux rate (Kg/s)
- n :
-
Exponent of cross-sectional area cut by particle
- p o :
-
Maximum pressure (Pa)
- r :
-
Radius of crater (m)
- r y :
-
Radius of plastically deformed zone (m)
- t :
-
Thickness of coating (m)
- z :
-
Axial distance normal to contact zone (m)
- α :
-
Angle of jet exit (deg)
- ε c :
-
Critical strain
- ε t :
-
Ductility
- θ :
-
Impact angle (deg)
- ν :
-
Poisson’s ratio
- μ :
-
Constant
- σ r,σ y :
-
Radial and yield stress (Pa)
- Ψ :
-
Angle representing the variation in plastically deformed zone
- n:
-
Normal direction
- t:
-
Tangential direction
- p:
-
Particle
- T:
-
Target
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Acknowledgments
Authors thankfully acknowledge the financial assistance provided by Council of Scientific and Industrial Research (CSIR), India, under project title ‘Development of Slurry Erosion Resistant Coatings for Hydroturbines’ [File no.: 22(0604)/12/EMR-II].
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Grewal, H.S., Singh, H. & Agrawal, A. A Phenomenological Model for Slurry Erosion Prediction of Thermal Spray Coatings. Tribol Lett 56, 119–132 (2014). https://doi.org/10.1007/s11249-014-0391-3
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DOI: https://doi.org/10.1007/s11249-014-0391-3