Since joining University of Michigan in 2013, Dr. Dong has developed a number of new graduate/undergraduate courses. These are:
NA 513: Defect Assessment (offered every other year): Defect Assessment or Engineering-Critical-Assessment (ECA or FFS) has become a powerful tool for providing quantitative evaluation of an in-service structure or component’s fitness for continued operation when a flaw or damage is detected. The product of an ECA assessment can be used to support a decision to run as is or implement proper remediation and/or monitoring techniques. ECA has also be increasingly used to support quality acceptance criteria during construction by demonstrating fitness for purpose of any material grade deviation, fabrication and construction related imperfections, as well as quality inspection requirements. This course discusses basic mechanics principles associated with modern defect assessment methodologies (e.g., BS 7910 and API 579 RP-1/ASME FFS-1) for applications in engineering structures in general and marine structures in particular.
NA 514: Fatigue of Structures (offered every other year): This course intends to prepare students with fundamental concepts of fatigue damage and failure in engineering structures and contemporary design and analysis procedures. Major limitations in existing design and analysis procedures practiced by industry and research community will be discussed. A particular emphasis will be placed upon fatigue behavior of as-manufactured components (e.g., welded structures) and recent developments in finite element based fatigue design and evaluation procedures. The fundamental concept and basic calculation procedures associated with mesh-insensitive structural stress method and master S-N curve approach will be discussed. Recommended fatigue testing procedure and data interpretation method will be illustrated. Fatigue-resistant joint design principles will be discussed along with real-world examples
NA 599-60: Residual Stresses and Distortions in Modern Manufacturing (offered on demand): This course starts with an introduction of some of the challenges in manufacture of modern metallic structures to meet increasingly stringent structural performance and manufacturing/life-cycle cost requirements. Residual stresses and distortions caused by modern manufacturing processes, such as thermal forming, cutting, welding (including recent developments in friction stir welding and computer-controlled rapid metal deposition or “3D printing”) have become increasingly a concern both for dimensional accuracy control in modular construction and for ensuring construction quality as well as structural integrity. This new course will introduce a series of novel first-principle based approaches to solving residual stress and distortion problems associated with these manufacturing processes. Then, basic finite element modeling procedures will be illustrated for solving a selected set of residual stress and distortion problems that are of direct relevant to engineering applications today, including evaluation of some proven mitigation techniques. Then, effects of residual stresses and distortions on structural strength, fatigue and unstable fracture will also be discussed.
NA 461: Marine Structure Construction (offered yearly): Construction of modern marine structures faces a number of challenges, e.g., small production volume (often one of kind), structural size and complexity, as well as increasingly stringent dimensional accuracy and structural integrity requirements. This course starts with a brief introduction of challenges of marine structure production in today’s global marketplace and the group technology concept as applied in modern shipbuilding. The emphasis is then placed upon the mechanics of metal fabrication processes and design for construction methodologies. Relevant metal fabrication processes and effects on mechanical performance of materials and components as well as dimensional accuracy will be analyzed using first-principle based models. Recent developments in distortion and accuracy control and underlying principles will also be discussed: (1) Challenges in modern marine structures construction and major drivers; (2) Interim product definitions and design attributes for maximizing repetitiveness; (3) Thermo-mechanical effects of major metal manufacturing processes on dimensional accuracy.
Dr. Dong’s current research activities are focused upon the following topical areas:
REPRESENTATIVE RESEARCH SPONSORS
Dr. Dong’s teaching and research interests include advanced design and analysis methodologies for engineering structures with an emphasis on welded structures and novel computational modeling techniques for manufacturing processes. He has developed numerous unique computational procedures that have been adopted by major manufacturing industries and National/International Codes & Standards. These include the mesh-insensitive structural stress method for fatigue design and life evaluation of welded structures adopted by 2007 ASME Div 2 International Code, the Joint 2007 ASME FFS-1/API 579 RP-1 Fitness for Service Code. Dr. Dong has published about 200 papers in peer-reviewed archive journals and major conference proceedings, giving over two dozens of Plenary/Keynote Lectures at major international conferences.
Representative National & International Awards:
Representative Plenary/Keynote Lectures at Major International Conferences
Editorship for Archive Journals
1. Mei, J., & Dong, P. (2017). Modeling of path-dependent multi-axial fatigue damage in aluminum alloys. International Journal of Fatigue, 95, 252-263.
2. Mei, J., & Dong, P. (2016). A new path-dependent fatigue damage model for non-proportional multi-axial loading. International Journal of Fatigue, 90, 210-221.
3. Xing, S., & Dong, P. (2016). An analytical SCF solution method for joint misalignments and application in fatigue test data interpretation. Marine Structures, 50, 143-161.
4. Xing, S., Dong, P. and Threstha, A., (2016). Analysis of fatigue failure mode transition in load-carrying fillet-welded connections. Marine Structures, 46, pp.102-126.
5. Dong, P., Song, S. and Pei, X., 2016. An IIW residual stress profile estimation scheme for girth welds in pressure vessel and piping components. Welding in the World, 60(2), pp.283-298
6. Song, S., & Dong, P. (2016). Residual stresses at weld repairs and effects of repair geometry. Science and technology of welding and Joining, DOI:10.1080/13621718.2016.1224544
7. Song, S., & Dong, P. (2016). A framework for estimating residual stress profile in seam-welded pipe and vessel components part I: Weld region. International Journal of Pressure Vessels and Piping, 146, 74-86.
8. Song, S., & Dong, P. (2016). A framework for estimating residual stress profile in seam welded pipe and vessel components Part II: Outside of weld region. International Journal of Pressure Vessels and Piping, 146, 65-73.
9. Pei, Xianjun; Dong, Pingsha; Modeling of banded structure in friction stir weld in strain rate–hardening materials of Zener–Hollomon type; 2015/1/29, Journal of Strain Analysis for Engineering Design, April 2015 vol. 50 no. 3 175-189
10. Pingsha Dong, Shaopin Song, Jinmiao Zhang, Myung H. Kim, On residual stress prescriptions for fitness for service assessment of pipe girth welds, International Journal of Pressure Vessels and Piping, Volumes 123–124, November–December 2014, Pages 19-29
11. Song, Shaopin; Dong, Pingsha; Pei, Xianjun; A full-field residual stress estimation scheme for fitness-for-service assessment of pipe girth welds: Part II–A shell theory based implementation; International Journal of Pressure Vessels and Piping, 2015/4/30, 128, 8-17
12. Song, Shaopin; Dong, Pingsha; Pei, Xianjun; A full-field residual stress estimation scheme for fitness-for-service assessment of pipe girth welds: Part I – Identification of Key Parameters, International Journal of Pressure Vessels and Piping, 2015/1/20, Vol. 126-127, 58-70
13. Pingsha Dong, Shaopin Song, Jinmiao Zhang, Analysis of residual stress relief mechanisms in post-weld heat treatment, International Journal of Pressure Vessels and Piping, Volume 122, October 2014, Pages 6-14
14. P. Dong, X. Pei, S. Xing, M.H. Kim, A structural strain method for low-cycle fatigue evaluation of welded components, International Journal of Pressure Vessels and Piping, Volume 119, July 2014, Pages 39-51
15. X. Pei and P. Dong. “Shear localization modelling of friction stir weld formation process.” Science and Technology of Welding and Joining, 2014; 19(5), 416-426.
16. Zhigang Wei and Pingsha Dong, A generalized cycle counting criterion for arbitrary multi-axial fatigue loading conditions, July 2014, The Journal of Strain Analysis for Engineering Design, 49: 325-341
17. Nie C, Dong P. A thermal stress mitigation technique for local postweld heat treatment of welds in pressure vessels. ASME. J. Pressure Vessel Technology. 2015;137(5):051404-051404-9. doi:10.1115/1.4029097
18. Wei, Z. and Dong, P., “A Rapid Path Length Searching Procedure for Multiaxial Fatigue Cycle Counting”, Fatigue and Fracture of Engineering Materials and Structures, 35, pp. 556–571, May, 2012
19. Dong, P. and Hong, J.K., “Fatigue of Tubular Joints: Hot Spot Stress Method Revisited,” ASME Transactions Journal of Offshore Mechanics and Arctic Engineering, August 2012, Vo. 134, No. 3, 1-12.
20. Dong, P., Wei, Z., & Hong, J. K. (2010). A path-dependent cycle counting method for variable-amplitude multi-axial loading. International Journal of Fatigue, 32(4), 720-734 …