04 AprMechanical Engineering Graduate SeminarDamage tolerant architected interfaces
Damage tolerant architected interfaces
  • Professor Marco Alfano, Hosted by Prof. Lubineau
  • University of Calabria, Italy
  • Thursday, April 04, 2019
  • 12:00 PM - 01:00 PM
  • Building 9, Level 2, Lecture Hall 1
2019-04-04T12:002019-04-04T13:00Asia/RiyadhDamage tolerant architected interfacesGraduate Seminar Damage tolerant architected interfacesBuilding 9, Level 2, Lecture Hall 1Emmanuelle Sougratemmanuelle.sougrat@kaust.edu.sa

‚ÄčAbstract:  Tuning interfacial adhesion is very desirable in many engineering applications, including adhesive bonds in composite materials, advanced biomedical tools, and metamaterials. This task has been classically accomplished through the use of surface preparation techniques. For example, chemical functionalization enables the control of fundamental surface properties such as wetting, contact angle, and adhesion energy. But it is increasingly apparent that the role of mechanics is as much important as surface chemistry. For this reason, a vigorous research effort has been focused on the structural response of patterned interfaces. The author and co-workers at COHMAS-KAUST tailored the interfacial toughness landscape in brittle adhesive bonds using laser irradiation. The results of peel tests indicated that interfacial patterns enable toughening and damage tolerance and turn a brittle response into a more ductile one [1].

A promising additional pathway has been recently put forward by the author, that has shown how modifying the sub-surface regions of the mating components allows tailoring the structural response of the interface [2,3]. Since this topic has been largely overlooked in the existing literature, the central theme of the talk will be the exploration of the considerable additional scope now offered by modern manufacturing technologies. It will be highlighted how sub-surface bulk patterns can control the strength, ductility, and toughness of adhesive interfaces. In particular, a bio-inspired design is deployed into selective laser sintering of polyamide substrates which feature the channels observed in the base plate of the Balanus albicostatus. The substrates are used to fabricate adhesively bonded fracture specimens for subsequent mechanical testing. The discussion will be mainly framed into the context of the author most recent experimental and numerical results, which include fracture testing, high-resolution in-situ imaging and interfacial modeling in the finite element setting [4,5].


Essential References
[1] E. Hernandez, M. Alfano, D. Pulungan, G. Lubineau, Sci Rep, 7, art. no. 16344, 2017.
[2] M. Alfano, C. Morano, L. Bruno, M. Muzzupappa, L. Pagnotta, Proc Str Int, 8, p. 604, 2018.
[3] C. Morano, L. Bruno, L. Pagnotta, M. Alfano, Proc Str Int, 12, p. 561, 2018.
[4] C. Morano, P. Zavattieri, M. Alfano, in preparation.
[5] C. Morano, M. Scagliola, M. Alfano, in preparation.

Biography:  Marco Alfano holds a Faculty Position in Mechanical Engineering at University of Calabria (UNICAL), Italy. Before his appointment, he also served as Post-Doctoral Fellow at KAUST from 2010 to 2012, at the University of Illinois at Urbana-Champaign in 2009 (Fulbright Scholar), at UNICAL from 2007 to 2008. His recent research has been mainly carried out in the broad area of mechanics of materials with particular emphasis on interfacial modeling and experimental analysis. He serves on the editorial board of a few international Journals, including the Journal of Adhesion Science and Technology and the International Journal of Adhesion and Adhesives. He has held visiting positions in renewed academic institutions in Europe, Middle-East and overseas.


MORE INFORMATION

  • Emmanuelle Sougrat
  • emmanuelle.sougrat@kaust.edu.sa
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