Ciclo: XXXVIII
Curriculum: Veicoli terrestri e sistemi di trasporto
Title of the PhD Project: Advanced fatigue models applied to traditional and
additive manufacturing materials, including the effects of plasticity
Supervisor(s) Prof. Ciro Santus, Prof. Bernardo Disma Monelli
Abstract of the PhD project: Classical ductile and traditional materials may undergo
cyclic plasticity under fatigue loadings in the presence of notches, thus a reliable description of the hardening behaviour of the material is necessary to model the cyclic plastic behaviour. The aim of the PhD project regarding the “traditional” materials is the combination of a proper hardening rule and advanced fatigue models, such as critical plane criteria and the theory of critical distances, to accurately describe the experimental fatigue results. On the other hand, the new additive manufacturing technologies allow the production of complex geometries by reducing the waste of material, but the obtained specimens generally present internal defects and considerable surface roughness. The aim of the PhD project regarding additive manufacturing materials is the development of a model that includes the effect of internal defects, the effect of surface roughness and the effect of geometrical notches, thus leading to a correct interpretation of the experimental fatigue results.
Publications
Romanelli, Lorenzo - Author details - Scopus
Orcid: 0000-0001-6484-5051
Articles published in international peer-reviewed journals indexed in Scopus
*indicates corresponding author
+indicates equally contributed to the work
1. Santus C., Romanelli L., Grossi T., Neri P., Romoli L., Lutey A.H.A., Pedranz M.,
Benedetti M., Torsional-loaded notched specimen fatigue strength prediction
based on mode I and mode III critical distances and fracture surface investigations
with a 3D optical profilometer. Int J Fatigue 2022;161:106913. http:
//dx.doi.org/10.1016/j.ijfatigue.2022.106913.
2. Santus C., Grossi T., Romanelli L., Pedranz M., Benedetti M. A computationally fast
and accurate procedure for the identification of the Chaboche isotropic-kinematic
hardening model parameters based on strain-controlled cycles and asymptotic
ratcheting rate. Int J Plast 2023;160:103503. http://dx.doi.org/10.1016/j.ijplas.
2022.103503.
3. Santus C., Romanelli L.*, Grossi T., Bertini L., Neri P., Bone L.L., Chiesi F., Tognarelli L.
Investigation of chaboche and Bouc–Wen parameters of quenched and tempered
steel and comparison of model predictive capabilities. Appl Sci 2023;13(5):2961.
http://dx.doi.org/10.3390/app13052961.
4. Santus C., Romanelli L.*, Grossi T., Bertini L., Bone L.L., Chiesi F., Tognarelli L.
Elastic–plastic analysis of high load ratio fatigue tests on a shot-peened quenched
and tempered steel, combining the Chaboche model and the Theory of Critical
Distances. Int J Fatigue 2023;174:107713. http://dx.doi.org/10.1016/j.ijfatigue.
2023.107713.
5. Santus, C.; Romanelli, L.*; Burchianti, A.; Inoue, T. Resonant Fatigue Tests on
Drill Pipe Connections with Different Geometries and Sizes. Applied Sciences 2023,
13, 8006. https://doi.org/10.3390/app13148006.
6. Macoretta, G.; Romanelli, L.*; Santus, C.; Romoli, L.; Lutey, A.H.A.; Uriati, F.;
Nicoletto, G.; Raghavendra, S.; Benedetti, M.; 555 Monelli, B.D. Modelling of the
surface morphology and size effects on fatigue strength of L-PBF Inconel 718 by
comparing 556 different testing specimens. International Journal of Fatigue 2024,
181, 108120. https://doi.org/10.1016/j.ijfatigue.2023.108120.
7. Santus C., Romanelli L.*, Grossi T., Neri P. Determination of Chaboche and Bouc-Wen
parameters for quenched and tempered steel. J Theoret Appl Mech 2024;507–19. http://dx.doi.org/10.15632/jtam-pl/188526.
8. Santus C., Romanelli L.*, Bertini L., Burchianti A., Inoue T. Resonant fatigue testson
polished drill pipe specimens. Machines 2024;12(5):314.http://dx.doi.org/10.3390/machines12050314.
9. Romanelli L., Santus C., Macoretta G., Barsanti M., Monelli BD., Senegaglia I., Lutey,
A.H.A, Rajaei H., Menapace C., Benedetti M. A TCD-based statistical method to assess
the impact of surface roughness and pores on the fatigue strength of LPBF Inconel 718
specimens. Int J Fatigue 2025;194:108821. http://dx.doi.org/10.1016/j.ijfatigue.2025.108821.
10. Romanelli L.*, Santus C., Senegaglia I., Tamburrino F., Controzzi M., Corrado A., Perini M.,
Kumar D., De Biasi R., Benedetti M. Lightweight design of polymeric thin-walled components:
Latticization and elastic–plastic homogenization. J Mater Res Technol 2025;36:2977–93. http://dx.doi.org/10.1016/j.jmrt.2025.03.137.
11. Romanelli L.*, Santus C., Senegaglia I., Tamburrino F., Controzzi M., Corrado A., Perini M.,
Kumar D., De Biasi R., Benedetti M. Towards Standardization of Tensile Testing for Strut-Based
Lattices Using Compensated Beam Modeling and Strain-Energy-Based Optimization
. Materials & Design 2025; 258, 114696. https://doi.org/10.1016/j.matdes.2025.114696.
12. Romanelli L.*, Santus C., Neri P., Murchio S., Benedetti M., Dereli E., Greiner M., Mittelstedt C.
Elastic–plastic homogenization of additively manufactured F2CCZ cells. Int J of Mech Sciences
2025; 305, 110763. https://doi.org/10.1016/j.ijmecsci.2025.110763.
Articles under review in international peer-reviewed journals indexed in Scopus
1. De Biasi R., Romanelli L.*, Santus C., Perini M., Berto F., Benedetti M. Fatigue life prediction of Multi Jet Fusion-manufactured Polyamide12 lattice structures using the Average Strain Energy Density method, Under review in International Journal of fatigue
2. Borracci P.+, Menel D.+, Romanelli L.+, De Biasi R., Napoleoni F., Senegaglia I., Santus C., Controzzi M., Benedetti M. Field-driven lattice design of a lightweight, personalized prosthetic socket. Under review in IEEE Transactions on Neural Systems & Rehabilitation Engineering
Proceedings indexed in Scopus
1. Inoue T., Sakurai N., Santus C. Romanelli L., Bhukya S. Fatigue Strength Evaluation of a Variety of Drill Pipes for Challenging Drilling in 7000 m Water Depths, IODP Expedition JTRACK. SPE - International Association of Drilling Contractors Drilling Conference Proceedings. https://doi.org/10.2118/223731-MS
Conferences as speaker or invited speaker
1. International Conference on Plasticity Damage and Fracture 2023, 3-9 January
2023, Barcelo Bavaro Resort, Punta Cana (Dominican Republic), Invited speech
2. 52nd AIAS conference (Associazione Italiana Analisi delle Sollecitazioni), 6-9
September 2023, Genova (Italy)
3. 2nd WECM (Workshop on Experimental and Computational Mechanics), 20-22
September 2023, Pisa (Italy)
4. 53rd AIAS conference (Associazione Italiana Analisi delle Sollecitazioni), 4-7
September 2024, Napoli (Italy)
5. Invited Lecture “Modelling of the fatigue strength of metal parts, obtained with both
Traditional and additive manufacturing technologies, taking into consideration the plasticity
and the effects of pores, surface roughness and notches” at IMT of Lucca by Prof. Marco Paggi,
24 October 2024, Lucca (Italy)
6. 5th International Symposium on Fatigue Design and Material Defects, 14-16 May 2025,
Trento (Italy)
7. Materials Today conference 2025, 23-26 June 2025, Sitges (Spain)
8. 54th AIAS conference (Associazione Italiana Analisi delle Sollecitazioni), 3-6
September 2025, Florence (Italy)
9. 5th International Conference on Simulation for Additive Manufacturing, 9-11
September 2025, Pavia (Italy)
10. 28th International Conference on Fracture and Structural Integrity, 15-18
September 2025, Catania (Italy) & Online
Awards
1. Best Paper award in experimental solid mechanics (2nd WECM (Workshop on
Experimental and Computational Mechanics), 20-22 Settembre 2023, Pisa)
Academic experiences
1. Post-graduate scholarship at the University of Pisa (April –November 2022) on the FE modelling of notched components with residual stresses
2. PhD visiting researcher at the Technical University of Darmstadt (Febbraio-Maggio 2025) on the elastic-plastic homogenization of beam-based lattice cells. Supervisor: Prof. Christian Mittelstedt
Patents
1. Santus C., Bertini L., Beghini M., Romanelli L., Burchianti A. Resonance bending fatigue test bench with position of the controlled tracking supports. application number: 812023000157164. The patent has been granted by UIBM (Ufficio Italiano Brevetti e Marchi) and it is under review for European patent Office (EPO).
Teaching experience
1. Winner of a scholarship of 60 hours for tutoring students at the 1st year of the BSc. in
aerospace engineering with mechanical drawing
2. Co-supervisor of 3 thesis for the BSc. in mechanical engineering
3. Co-supervisor of 1 thesis for the MSc. in mechanical engineering