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Effects of Analysis Method, Bolt Pre-Stress, and Cover Plate
Thickness on the Behavior of Bolted Flanges of Different
SizesStatus Report 3
Chris WowkMANE 6970
Master’s Project
All Analyses Completed Technical Content Sections Populated Comments Incorporated
To Go Finalize Appendices Abstract Acknowledgements
Status
Waters and Schneider’s (1969) method for analyzing cover plate/flange joints extended to determine flange separation
Analytical Solution
Cases RunNPS Size
Cover Thickness
Bolt Pre-Stress 0Pressure
Load25% Yield
80% Yield
0Pressure
Load25% Yield
80% Yield
0Pressure
Load25% Yield
80% Yield
0Pressure
Load25% Yield
80% Yield
Radial Beam Theory
Solid Element FEA
Shell Element FEA
Radial Beam Theory
Appendix Y Equations
Solid Element FEA
Shell Element FEA
Radial Beam Theory
Appendix Y Equations
Solid Element FEA
Shell Element FEA
Radial Beam Theory
Solid Element FEA
Shell Element FEA
Joint Separation Along Length
Radial Location of Contact
Stress In Center of Cover
Maximum Joint Separation
AnalysisMethod
t1 0.5*t1 2*t1
4"
t2
16"
Shell/Beam FEA predicts much lower joint separations (all cases)
Joint Separation decreases as cover thickness increases
Greater separation for larger size flange at low preloads. Approaches similar limit as smaller joint as preload increases
Joint SeparationResults
Great agreement between analysis methods for 4 NPS joint
Contact location cannot be normalized to compare different sized joints
Normalized Location of Contact
RBT and Appendix Y equations appear to approach a limit
FEA solutions show increase at high preloads
Stress decreases as cover thicknesses increases
Stress In Center of Cover
ASME Boiler and Pressure Vessel Code, Section VIII – Rules for Construction of Pressure Vessels, 2013 Edition, Appendix Y.
Galai, H and Bouzid, A.H, “Analytical Modeling of Flat Face Flanges with Metal-to-Metal Contact Beyond the Bolt Circle,” Journal of Pressure Vessel Technology, Vol 132, 2010.
Schneider, R.W, “Flat Face Flanges with Metal-to-Metal Contact Beyond the Bolt Circle,” Transactions of the ASME, Vol 90, 1968, pgs 82-88.
Waters, E.O and Schneider, R.W, “Axisymmetric, Nonidentical, Flat Face Flanges with Metal-to-Metal Contact Beyond the Bolt Circle,” Journal of Engineering for Industry, Vol 91, 1969, pgs 615-622.
References