Oka Wear Model
The Oka or Impact Wear contact model extends any Base Model to give an estimation of erosion depth for Geometry surfaces due to particle impacts.
This model originates from the work by Oka and Yoshida (Oka and Yoshida,
2005). Erosive wear occurs when particles impact equipment surfaces. This
type of wear can be modeled using the widely adopted Oka wear model (Oka and Yoshida,
2004), which predicts the volume of removed material due to particle impact
as a function of the particle size, impact velocity, and impact angle. This model takes
only two inputs - the Vickers hardness of the worn material and an empirical wear
constant. The results are provided in terms of wear depth on Geometry mesh elements
similar to the Archard Wear model.
The wear depth is determined as follows:
Where dw is the wear depth, α is the
particle impact angle, g(α) is the impact angle dependence of normalized
erosion, E(α) is the wear volume per unit mass, mp is the mass
of the particle and A is the Geometry element area.
The wear volume per unit mass is defined as:
Where W is the materials wear constant, v is
the particles impact velocity, Hv is the Vickers hardness of worn
material, D is the particle diameter and k1 is an experimentally derived
coefficient.
The impact angle dependence of normalized erosion is defined as:
Where
captures the normalized erosion due to repeated
deformation and
captures the cutting behavior of the impact.
Using this model in EDEM requires the additional input
of the material’s Vickers hardness, Hv(GPa), the material’s Wear
Constant, WOka.
Interaction | Configurable Parameters | Position |
---|---|---|
Particle to Geometry | Assign a wear constant, the Vickers Hardness value for each Equipment Material-Particle interaction and Scaling Factor (if Deformation enabled). | Last |
EDEM also provides the option to deform the Geometry according to the
quantitative results given by the Impact Wear model.
In the Oka Wear Model Parameter values dialog box:
- Select the Enable Deformationcheck box to enable Geometry deformation.
- If you select Enable Deformation, you must specify the Scaling Factor which allows the deformation results to be scaled as desired.
Material | WOka | Vickers Hardness (GPa) |
---|---|---|
Carbon Steel | 3 | 0.54 - 1.18 |
Stainless Steel | 10 | 1.770 |
Aluminum | 1000 | 0.36 |