1. Chris Wowk MANE 6970 Master’s Project
Effects of Analysis Method, Cover Plate Thickness, and Bolt Preload on the Behavior of Bolted Flanges of Different Sizes Status Report 1
Chris Wowk
MANE 6970
Master’s Project

2. Status 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

3. Preliminary FEA Analyses
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

4. Contact Diameter Algorithm for Comparison to Analytic Solutions
𝐷 𝑐𝑜𝑛𝑡𝑎𝑐𝑡 = 𝐶𝐹𝑜𝑟𝑐 𝑒 𝑛 ∗ 𝑟 𝑛 𝐶𝐹𝑜𝑟𝑐 𝑒 𝑛
Contact Forces and Location Extracted from Path
Paths Along Bolt Center and in Between Bolts will be average

5. Flange Separation
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

6. Schedule Going Forward
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

7. References 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 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