UF	external work caused by the change of the potential energy of the liquid
UF(a)	the UF when r = a
Ua	energy absorbed by the enclosed air
Ua(a)	the Ua when r = a
Uef	elastic strain energy stored in the blistering thin film
Uef(a)	the Uef when r = a
Ud	energy released on the delamination region
G	energy release rate
K	proportional coefficient
S	area of the circular delamination region
a	radius of the circular delamination region
R 0	radius of the hole in the rigid substrate
R	inner radius of the container
H 1	initial height of the air in left container
H	height of the liquid added to the right container each time
h 1,i	height of liquid in the left container after step i of loading operation
h 2,i	height of liquid in the right container after step i of loading operation
ρ	density of the liquid in the container
g	acceleration of gravity
P	pressure of gas
V	volume of gas
N	number of gas molecules per unit volume
K	Boltzmann constant
T	temperature of gas
V 0	initial volume of the air in left container
Vn	volume of the air in left container after the step n of loading operation
r	radial coordinate
w	transversal displacement
u	radial displacement
h	thickness of the membrane
θ	slope angle of the deflected membrane
σr	radial stress
σt	circumferential stress
er	radial strain
et	circumferential strain
E	Young’s modulus of elasticity
$\nu$	Poisson’s ratio
x	dimensionless form of r
Q	dimensionless form of q
W	dimensionless form of w
U	dimensionless form of u
Sr	dimensionless form of σr
St	dimensionless form of σt
bi, ci, di	coefficients of Sr, St and W