Notation
CNC	Computerized Numerical Control
PVD	Physical Vapor Deposition
Symbol
σ	The equivalent flow stress
ε	The equivalent plastic strain rate
ε 0	The reference plastic strain rate
T	The absolute temperature
Tr	The ambient temperature
Tm	The melting temperature
A	the yield strength
B	The hardening modulus
C	The strain rate sensitivity coefficient
m	The heat softening coefficient
n	The strain hardening index
V	The material removal rate
vf	The feed speed
d	The cutter diameter
ap	The cutting depth
ae	The cutting width
fz	The feed per tooth
fz	The feed per tooth
z	The number of teeth
W Adhesion wear	The adhesion wear
σn	The positive pressure
vc	The chip slip speed
T	The celsius
Aw	The wear characteristic constant
Bw	The wear characteristic constant
lk	The kth phase
tk	The period k
n	The number of evaluated objects
si	The ith object to be evaluated
m	The number of performance indicators
T	The number of time periods
xj	The jth performance indicator
xij(tk)	The value of the ith evaluated object about the jth indicator at the time tk
Bk	The static evaluation matrix of the kth period
yi(tk)	The static evaluation value of the ith evaluated object in the kth period
Y	The static comprehensive evaluation matrix
η max	The mean maximum gain
η min	The mean minimum gain
$\overline{\eta }$	The average gain
η +	The optimal gain level
η −	The inferior gain level
yi+(tk)	The optimal excitation point of the ith evaluated object at time tk
yi−(tk)	The inferior excitation point of the ith evaluated object at time tk
υi+(tk)	The optimal excitation quantity obtained by the ith evaluated object at time tk
υi−(tk)	The inferior excitation obtained by the ith evaluated object at time tk
zi(tk)	The dynamic comprehensive evaluation value of the ith evaluated object at tk moment
h +	The optimal excitation factor
h −	The inferior excitation factor
r	The proportional relationship between the total amount of the optimal excitation quantity and the total amount of bad incentives
τk	The time factor
zi	The total dynamic comprehensive evaluation value of the ith evaluated object
Ujh	The weight ratio of the jth performance indicator to the hth performance indicator