Chris Wowk
MANE 6970
Master’s Project





4” NPS Flange/Cover ABAQUS Model
Developed
Multiple Preload & Cover Thickness Models
Successfully Run
Mesh Optimized for Contact Recognition
Post-processing Algorithms for Determining
Average Contact Diameter and Flange
Separation Developed
Analytical Flange Behavior Models in Process
◦ Results will determine actual DOE FEA runs
Von Mises Stress
Spec Thicknesses & 2 lbf Preload
100x Deformation
1/8 (45° Segment) ABAQUS Model
(8 bolts)
Contact Pressure
Only at OD of
Cover/Flange
𝐷𝑐𝑜𝑛𝑡𝑎𝑐𝑡 =
𝐶𝐹𝑜𝑟𝑐𝑒𝑛 ∗ 𝑟𝑛
𝐶𝐹𝑜𝑟𝑐𝑒𝑛
Contact Forces and Location
Extracted from Path
Paths Along Bolt Center and in
Between Bolts will be average




Algorithm for Deterring
Flange Separation Along the
Radius Developed and
Working
Results Agree with Theory
COPEN can also be used
should
Flange separation
calculation method for
analytic models still needs
development
Flange Separation vs Bolt Preload
(Spec Thickness Flanges)
0.005
0.004
0.003
0.002
0.001
0
-0.001
0
0.2
1 lbf
0.4
WP
0.6
25YS
0.8
80YS
1
COPEN






3/12 – First Progress Report Presentation
3/19 – Preliminary Background/Introduction
and Theory/Methodology Section Complete
4/2 – All Analysis Complete. Second Progress
Report
4/16 – Final Report Draft
4/30 – Prelim Final Report
5/14 – Final Report



ASME Boiler and Pressure Vessel Code
Galai, Hichem, and Bouzid, A.H, Analytical Modeling of Flat
Face Flanges with Metal to Metal Contact Beyond the Bolt
Circle, Journal of Pressure Vessel Technology, ASME, Vol 132.
December 2010
Schneider, R. W, and Waters, E. O, The Background of ASME
Code Case 1828: A Simplifying Model of Analyzing Part B
Flanges, Journal of Pressure Vessel Technology, ASME, Vol.
100, No. 2, May 1978