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Chapter 8 – Combined Loading CL = 2 or more stresses at a given point.
Chapter 8 – Combined Loading
CL = 2 or more stresses at a given point.
8.1 Thin-Walled (r/t > 10) Pressure Vessels:
Assumption: Thin walled so assume stress uniform throughout the wall!
0)2()(20 1 dyrpdytFx
tpr
1 Normal stress in the hoop direction
1 uniform throughout wall!
Circumferential or Hoop Stress:
Assumption: Thin walled so assume stress uniform throughout the wall!
0)()2(0 22 rptrFy
tpr22 Normal stress in the
longitudinal direction
Longitudinal Stress:
Note, this stress = hoop stress/2
tpr22
tpr
1
Summary: Cylindrical Pressure Vessels:
Circumferential or Hoop Stress
Longitudinal Stress
What about Spherical Pressure Vessels?
tpr221
Examples:
Examples:
Elastomer volume = 13.8 in3
(was 16.2 in3)
Wall thickness = .10”
RJM 6/2/04
