Abstract
Optimization of the cold spray process is extremely challenging due to the involvement of a large number of process parameters as well as material properties. Modern approaches for modeling the cold spray process have relied largely on numerical simulations. In this paper, we shall present a simplified mathematical model which will be benchmarked against experimental and numerical measurements available in the literature and demonstrate that the model shows reasonable agreement with real-world observations. We will present a parametric study using this model and identify the factors that strongly affect the cold spray process, which can be used for identifying and optimizing the process parameters and the material properties.
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Abbreviations
- \(\varepsilon\) :
-
Plastic strain
- \(\varepsilon_{\text{f}}\) :
-
Final strain
- k :
-
Strength coefficient
- σ :
-
Stress
- n :
-
Strain hardening exponent
- U se :
-
Strain energy
- U re :
-
Rebound energy
- e :
-
Coefficient of restitution
- e r :
-
Recoil coefficient
- m p :
-
Particle mass
- v p :
-
Particle velocity
- v cr :
-
Critical velocity
- σ yp :
-
Effective yield stress
- E p :
-
Elastic modulus of the particle
- E s :
-
Elastic modulus of the substrate
- E* :
-
Effective elastic modulus
- Δγ :
-
Difference in interface energy between the colliding bodies
- μ s :
-
Poisson’s ratio of the substrate
- μ p :
-
Poisson’s ratio of the particle
- ρ p :
-
Particle density
- d p :
-
Particle diameter
- a :
-
Contact radius
- R p :
-
Radius of the particle
- R s :
-
Radius of the substrate
- R :
-
Effective radius on elastic collision
- F :
-
Applied force on the substrate
- r :
-
Radius of the spherical cap
- h :
-
Height of the spherical cap
- C d :
-
Particle drag coefficient
- C 2 :
-
Fitting parameter
- R g :
-
Gas constant
- L d :
-
Nozzle divergent length
- P 0 :
-
Inlet pressure/gas stagnation pressure
- T 0 :
-
Inlet temperature/gas stagnation temperature
- A :
-
Yield stress
- B :
-
Hardening constant
- C :
-
Strain rate constant
- m :
-
Thermal softening exponent
- \(\dot{\varepsilon }\) :
-
Strain rate
- \(\dot{\varepsilon }_{0}\) :
-
Normalizing reference strain rate
- T* :
-
Normalized reference temperature
- T m :
-
Melting temperature
- T r :
-
Reference temperature
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Acknowledgments
This work is funded through Faculty Research and Innovation Award (FRIA) grant, for which the authors are grateful to Indian Institute of Technology Ropar, Rupnagar (India).
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Palodhi, L., Singh, H. On the Dependence of Critical Velocity on the Material Properties During Cold Spray Process. J Therm Spray Tech 29, 1863–1875 (2020). https://doi.org/10.1007/s11666-020-01105-7
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DOI: https://doi.org/10.1007/s11666-020-01105-7