STRESSES DUE TO INTERFERENCE (PRESS OR SHRINK) FITS
SI/Metric Units
INPUT DATA
Title
Outside diameter of outer member, d
o
m
Contact surface diameter, d
c
m
Inside diameter of inner member, d
i
m
Modulus of elasticity of outer member, E
o
10
9
N/m
2
Poisson's ratio of outer member, υ
o
;
Modulus of elasticity of inner member, E
i
10
9
N/m
2
Poisson's ratio of inner member, υ
i
;
Total interference, δ
m
RESULTS
PRESSURE
Values
Units
♦ Pressure at contact surface, p
c
12.6141
10
6
N/m
2
STRESSES
Lamé's equation
Birnie's equation
Units
♦ Stress on surface at d
o
, σ
o
16.1719
16.1719
10
6
N/m
2
♦ Stress on surface at d
c
for outer member, σ
co
28.7859
32.5702
10
6
N/m
2
♦ Stress on surface at d
c
for inner member, σ
ci
-12.6141
-8.8298
10
6
N/m
2
♦ Stress on surface at d
i
, σ
i
-25.2281
-25.2281
10
6
N/m
2