CESS Seminar Series - Probabilistic modeling of fatigue resistance for welded joints
Event details
| Date | 01.04.2022 |
| Hour | 12:15 › 13:00 |
| Speaker | Prof. Davide Leonetti, Eindhoven University of Technology |
| Location | |
| Category | Conferences - Seminars |
| Event Language | English |
Abstract
The design of civil infrastructures subjected to fatigue loading should satisfy a predetermined safety level, usually expressed in terms of structural reliability. A sound probabilistic model of the fatigue resistance is required for this purpose. A better, i.e. more reliable, modeling of the fatigue resistance allows reducing the uncertainty, especially those related to the threshold, which has economic implications for bridge infrastructures.
This presentation concerns the probabilistic modeling for the fatigue resistance for welded joints in bridges using fatigue resistance curves and based on a fracture mechanics derivation. The fatigue resistance curves relate the load level, i.e. the stress range, to the number of cycles to failure, whereas fracture mechanics enables modeling the macrostructural fatigue damage consisting of the stable cycle-by-cycle propagation of cracks. Two types of cyclic loading are considered: (1) constant amplitude (CA) loading, which is applied in the majority of laboratory tests carried out in the past to characterize the fatigue strength of the material and of structural components and (2) variable amplitude (VA) loading, the type of loading that structural components in bridges experience in service where the threshold phenomena are relevant.
Biography
Davide Leonetti was born on 16-12-1989 in Caserta, Italy. He studied Mechanical Engineering for Design and Production at the “Federico II” University of Naples. In 2015 he graduated within the RaMeG (Railway Mechanics Group) on a thesis about the strength analysis of railway switch maneuvering systems for high-speed railway turnouts for train speeds up to 350km/h.
He got his Ph.D. at Eindhoven University of Technology with a study on the formulation and the use of advanced probabilistic fatigue resistance models for welded joints using both stress-life curves and linear elastic fracture mechanics.
Since 2020 he is employed at Eindhoven University of Technology as an assistant professor in Steel Structures and Structural Health Monitoring. His current research projects concern further investigation of fatigue crack initiation and growth in steel bridges as well as the use of Artificial intelligence for inspection and structural health monitoring of civil infrastructures.
The design of civil infrastructures subjected to fatigue loading should satisfy a predetermined safety level, usually expressed in terms of structural reliability. A sound probabilistic model of the fatigue resistance is required for this purpose. A better, i.e. more reliable, modeling of the fatigue resistance allows reducing the uncertainty, especially those related to the threshold, which has economic implications for bridge infrastructures.
This presentation concerns the probabilistic modeling for the fatigue resistance for welded joints in bridges using fatigue resistance curves and based on a fracture mechanics derivation. The fatigue resistance curves relate the load level, i.e. the stress range, to the number of cycles to failure, whereas fracture mechanics enables modeling the macrostructural fatigue damage consisting of the stable cycle-by-cycle propagation of cracks. Two types of cyclic loading are considered: (1) constant amplitude (CA) loading, which is applied in the majority of laboratory tests carried out in the past to characterize the fatigue strength of the material and of structural components and (2) variable amplitude (VA) loading, the type of loading that structural components in bridges experience in service where the threshold phenomena are relevant.
Biography
Davide Leonetti was born on 16-12-1989 in Caserta, Italy. He studied Mechanical Engineering for Design and Production at the “Federico II” University of Naples. In 2015 he graduated within the RaMeG (Railway Mechanics Group) on a thesis about the strength analysis of railway switch maneuvering systems for high-speed railway turnouts for train speeds up to 350km/h.
He got his Ph.D. at Eindhoven University of Technology with a study on the formulation and the use of advanced probabilistic fatigue resistance models for welded joints using both stress-life curves and linear elastic fracture mechanics.
Since 2020 he is employed at Eindhoven University of Technology as an assistant professor in Steel Structures and Structural Health Monitoring. His current research projects concern further investigation of fatigue crack initiation and growth in steel bridges as well as the use of Artificial intelligence for inspection and structural health monitoring of civil infrastructures.
Practical information
- Informed public
- Free
Organizer
- Prof. Brice Lecampion (GEL) and Prof. Alexandre Alahi (VITA)
Contact
- Prof. Alain Nussbaumer (RESSLab)