Leibniz University Hannover, Hannover, Germany
Elyas Ghafoori
Biography
Elyas Ghafoori is a full professor at the chair of “Steel, Composite and Lightweight Construction” at the faculty of Civil Engineering and Geodetic Science in the Leibniz University of Hannover (LUH), Germany. He is the Executive Director of the “Institute for Steel Construction” at the LUH and also a Board Director at the Test Center Supporting Structures in Hannover. Elyas Ghafoori teaches in the area of steel and composite construction and conducts research mainly in the field of steel support structures for wind energy (e.g., on- and offshore wind turbines), robotic/additive manufacturing of optimized lightweight constructions and high-performance structural materials (e.g., FRP composites and structural adhesives, memory steel, and 3D printing).
Conferences
Room |
Date |
Hour |
Subject |
|---|---|---|---|
| Room 8 |
19-11-2025 |
2:30 pm – 3:00 pm |
26 Fatigue strengthening and lifetime extension of steel structures with bonded CFRP and SMA materials |
| Room 6 |
19-11-2025 |
11:45 am – 12:15 pm |
27 Fatigue assessment and simulations of steel produced using wire arc directed energy deposition |
Conferences Details
26 Fatigue strengthening and lifetime extension of steel structures with bonded CFRP and SMA materials
The International Energy Agency estimates that direct CO2 emissions due to crude steel production is approximately 1.4 tons CO2 per ton steel produced. In order to achieve the targets of Net Zero 2050, steel industry has to reduce the greenhouse gas emissions. An effective approach to reach this target is to practice repair or reuse of existing structures to reduce the demand for crude steel production. Application of shape memory alloys (SMAs) and carbon fibre-reinforced polymer (CFRP) materials has shown a great potential for lifetime extension of steel structures. In this work, the principle of fatigue strengthening using SMA and CFRP materials are discussed. Different prestressed bonded and unbonded systems are presented. Finally, a few different applications of fatigue lifetime extension of steel bridges are presented.
27 Fatigue assessment and simulations of steel produced using wire arc directed energy deposition
This work presents the behavior of as-built and machined wire arc additively manufactured (WAAM) steel. Using 3D laser scans of WAAM coupons, finite element (FE) models are developed and validated against experimental results obtained through digital image correlation (DIC). Methods for local stress analysis, accounting for material thickness, predict local stresses with reasonable accuracy and high computational efficiency. These stresses are then used to predict fatigue crack initiation and fatigue life, showing good agreement with experimental results classes, FAT 145 and FAT 135, with endurance limits of 270 MPa and 250 MPa, respectively, are derived for WAAM ER70S-6 steel using the proposed models.
