|
a length of micro-cavity in axial direction |
b length of micro-cavity in circumferential direction |
|
C10, C01, d Mooney–Rivlin coefficients |
Drod rod diameter |
|
E equivalent Young’s modulus |
Eseal Young’s modulus of the seal |
|
F cavitation factor |
Fsum sum of the pressure differences |
|
h film thickness |
h0 initial film thickness |
|
hp depth of the micro-cavity |
hr rod surface height |
|
hT average truncated film thickness |
hw wear depth |
| Δh micro deformation of the sealing lip surface |
H hardness |
|
I1, I2 deviatoric strain invariants |
J parameter relating to the elastic deformation gradient |
|
k wear modulus |
K wear coefficient |
|
L side length of texture |
Lx length of the simulation space in axial direction |
|
Ly length of the simulation space in circumferential direction |
p static contact pressure |
|
pa ambient pressure |
pc asperity contact pressure |
|
pcav cavitation pressure |
pf fluid pressure |
|
pn normal contact pressure |
ps sealed pressure |
| Δp pressure difference |
averge asperity contact pressure |
|
rc radius of circular micro-cavity |
rs wear distance rate |
|
rt wear time rate |
R asperity radius of the seal |
|
S relative sliding distance |
u rod speed |
|
V material wear volume |
W normal load |
|
strain energy density |
x coordinate in x-axis direction |
|
y coordinate in y-axis direction |
η asperity density of the seal |
|
γ ratio of the axial length of micro-cavity to the circumferential length |
μ fluid viscosity |
|
μ0 fluid viscosity under the ambient pressure |
σ seal surface roughness |
|
σs equivalent standard deviation of surface roughness |
ϕx, ϕy pressure flow factors |
|
ϕs.c.x shear flow factor |
Φ fluid pressure or density of the cavitation region |
|
υseal Poisson’s ratio of the seal |
|