Luca Di Stasio

Luca Di Stasio
King Abdullah University of Science and Technology | KAUST · Division of Physical Sciences and Engineering (PSE)

Doctor of Philosophy
Postdoctoral Research Fellow at King Abdullah University of Science and Technology (KAUST)

About

25
Publications
42,684
Reads
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13
Citations
Introduction
I am a Professional Engineer (Italian License, 2013). I completed a Ph.D. in Polymeric Composite Materials at Luleå University of Technology (2019) and a Ph.D. in Materials Science at Université de Lorraine (2019). I earned a M.Sc. in Space Engineering from Politecnico di Milano (2013); a M.Sc. in Mechanical Engineering from Drexel University (2012); a B.Sc. in Aerospace Engineering from Politecnico di Milano (2010). To know more about me visit http://www.lucadistasioengineering.com.
Additional affiliations
January 2018 - December 2019
Luleå University of Technology
Position
  • Researcher
Description
  • Project: Mechanics of extreme thin composite layers for aerospace applications. Working language: English, Swedish.
October 2015 - December 2017
University of Lorraine
Position
  • Researcher
Description
  • Project: Mechanics of extreme thin composite layers for aerospace applications. Working language: French, English.
January 2014 - July 2015
Zurich learning center
Position
  • Tutor
Description
  • I worked as a teacher of extracurricular activities of tutoring for high school and undergraduate students. Subjects: Mathematics, Physics, Statistics, Econometrics, Java programming. Working language: German, English.
Education
December 2015 - December 2019
Université de Lorraine
Field of study
  • Materials Science
December 2015 - December 2019
Luleå University of Technology
Field of study
  • Polymeric Composite Materials
November 2013 - November 2013
Politecnico di Milano
Field of study
  • Industrial Engineering

Publications

Publications (25)
Article
We consider crack tip deformations under plane stress conditions of a Neo-Hookean sheet reinforced by Neo-Hookean fibers, whose orientation and elastic properties are described by discrete and continuous spatial distributions. The mechanical behavior of the composite is described in terms of the first and fourth invariant of the right Cauchy-Green...
Article
Full-text available
The growth of fiber/matrix interface cracks (debonds) located on consecutive fibers along the through-the-thickness (vertical) direction is studied in glass fiber-epoxy UD composites. Debonds could appear, along the vertical direction, on the same or on opposite sides of their respective fibers. Determining which configuration is the most energetic...
Article
Models of Representative Volume Elements of cross-ply laminates with different geometric configurations and damage states are studied. Debond growth is characterized by the estimation of the Mode I and Mode II Energy Release Rate using the Virtual Crack Closure Technique. It is found that the presence of the [Formula: see text] interface and the th...
Thesis
Full-text available
At the end of the second decade of the XXI century, the transportation industry at large faces several challenges that will shape its evolution in the next decade and beyond. The first such challenge is the increasing public awareness and governmental action on climate change, which are increasing the pressure on the industrial sectors responsible...
Article
The bi-material interface arc crack has been the focus of interest in the composite community, where it is usually referred to as the fiber-matrix interface crack. In this work, we investigate the convergence properties of the Virtual Crack Closure Technique (VCCT) when applied to the evaluation of the Mode I, Mode II and total Energy Release Rate...
Preprint
Full-text available
Models of Representative Volume Elements (RVEs) of cross-ply laminates with different geometric configurations and damage states are studied. Debond growth is characterized by the estimation of the Mode I and Mode II Energy Release Rate (ERR) using the Virtual Crack Closure Technique (VCCT). It is found that the presence of the 0° /90° interface an...
Preprint
Full-text available
The effects of crack shielding, finite thickness of the composite and fiber content on fiber/matrix debond growth in thin unidirectional composites are investigated analyzing Representative Volume Elements (RVEs) of different ordered microstructures. Debond growth is characterized by estimation of the Energy Release Rates (ERRs) in Mode I and Mode...
Preprint
Full-text available
The bi-material interface arc crack has been the focus of interest in the composite community, where it is usually referred to as the fiber-matrix interface crack. In this work, we investigate the convergence properties of the Virtual Crack Closure Technique (VCCT) when applied to the evaluation of the Mode I, Mode II and total Energy Release Rate...
Article
The effects of crack shielding, finite thickness of the composite and fiber content on fiber/matrix debond growth in thin unidirectional composites are investigated analyzing Representative Volume Elements (RVEs) of different ordered microstructures. Debond growth is characterized by estimation of the Energy Release Rates (ERRs) in Mode I and Mode...
Presentation
Full-text available
In recent years, much work has been devoted to the characterization of so-called thin-ply laminates, in which the central 90° ply can today achieve a thickness of the order of 4-5 fiber diameters thanks to the spread-tow technology [1]. Due to the several beneficial properties observed in this class of composites, designers are currently evaluating...
Presentation
Full-text available
The adoption of the spread tow technology [1] at the industrial level in recent years has allowed the diffusion in the composite market of a novel type of material, the thin and ultra-thin ply laminates. A number of experimental and theoretical investigations over the years have shown the benefits stemming from the new laminate design. Among these,...
Conference Paper
Full-text available
The growth of fiber/matrix interface cracks (debonds) located on consecutive fibers along the through-the-thickness direction is studied in glass fiber-epoxy UD composites. Two different families of Representative Volume Elements (RVEs) are developed: the first implements the classic condition of coupling of the vertical displacements to model a un...
Presentation
Full-text available
Research on scaling laws of damage in materials and structures has absorbed the attention of the Fracture Mechanics community since the inception of the field itself. The attractiveness of such relationships resides in their simplicity and predictive power, which would allow a more cost-effective design of structures. Building on early works in dim...
Presentation
Full-text available
The design of the course T7005T-Aerospace Materials is analyzed according to the pedagogical principles of constructive alignment [1, 2]. It is found that a design issue exists, particularly in the section of the course devoted to damage in composite materials. This view is supported by the feedback gathered from students who attended the course in...
Presentation
Full-text available
LTU’s Learning Management System (a.k.a LMS) Canvas, – should be considered as a core system since the majority of teachers and students at LTU using Canvas to support the learning process. The participant should aim to gain knowledge on designing learning environments in Canvas, based on acquired knowledge from the different topics in the Qualifyi...
Preprint
Full-text available
The design of the course T7005T-Aerospace Materials is analyzed according to the pedagogical principles of constructive alignment [1, 2]. It is found that a design issue exists, particularly in the section of the course devoted to damage in composite materials. This view is supported by the feedback gathered from students who attended the course in...
Presentation
Full-text available
A few manufacturers in the world, among them NTPT (USA-CH), Oxeon (SE), Chomarat (FR), Hexcel (USA) and Technomax (JP), offer today ultra-thin fiber reinforced composite plies with thicknesses of around 2-4 times the reinforcement’s diameter. Values of the ratio of thickness to reinforcement diameter as small as those found in thin plies test the...
Conference Paper
Full-text available
The Energy Release Rate (ERR) and the contact zone size for a fiber/matrix interface debond are studied for a thin-ply glass fiber/epoxy laminate. The main objective is to analyze the effect on the debonding process of the presence of a traction free specimen surface or an adjacent material, in the form of a stiffer UD ply or by considering it as p...
Poster
Full-text available
L’industrie aéronautique du XXIe siècle se trouve à faire face à des sollicitations toujours plus pressantes par la société au sens large qui demande, d’un côté, la réduction drastique de son impact environnemental et, d’autre côté, l’extension de l’accessibilité à ces moyens de transport aux classes démographiques moins aisée. Ces demandes se trad...
Presentation
Full-text available
Introduit il y a environ 20 ans, la technologie dite en anglais spread tow technology a permis la production au niveau industriel des composites stratifiés avec couches extrêmement minces. Les producteurs de ce type de composite, comme North Thin Ply Technology en Suisse et Oxeon en Suède, sont aujourd’hui capables d’offrir des plis pré-imprégnés a...
Presentation
Full-text available
Introduced around 20 years ago, the so-called spread tow technology has allowed the production on industrial scale of extremely thin fiber-reinforced prepreg plies. The few manufacturers of this kind of composite material, such as North Thin Ply Technology in Switzerland and Oxeon in Sweden, are nowadays capable of providing prepregs with thickness...
Poster
Full-text available
Introduced around 20 years ago, the so-called spread tow technology has allowed the production on the industrial scale of extremely thin fiber-reinforced prepreg plies. The few manufacturers of this kind of composite material, such as North Thin Ply Technology in Switzerland and Oxeon in Sweden, are nowadays capable of providing prepregs with thick...
Presentation
Full-text available
Introduced around 20 years ago, the so-called spread tow technology has allowed the production on the industrial scale of extremely thin fiber-reinforced prepreg plies. The few manufacturers of this kind of composite material, such as North Thin Ply Technology in Switzerland and Oxeon in Sweden, are nowadays capable of providing prepregs with thick...
Thesis
Full-text available
Delamination onset and propagation represent one of the most safety-critical failure modes in structures made of FRP laminates. Due to the widespread use of laminated composites in primary and secondary structures, the assessment of fracture behaviour of FRP and the development of reliable analytical and numerical formulations for damage prediction...
Research Proposal
Full-text available
The development of accurate models and simulations is becoming increasingly important in fault detection and prevention techniques applied to a wide variety of engineered systems. The recent advances in measurement devices technology has provided the designer an incredible amount of data related to acoustic, thermal and optic behaviour of the mater...

Questions

Questions (2)

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Projects

Projects (4)
Archived project
The primary target group of this course is employees and PhD students at Luleå University of Technology. The aim is that the participant will develop fundamental pedagogical proficiency for teaching in Higher Education generally and at LTU specifically. The participants will develop a readiness to constructively take part in discussions among colleagues on the topic of education and improvement in teaching within their own fields. The contributions should be based on scientific grounds and proven experience. Moreover, participants shall begin describing their basic pedagogical standpoints, both in view of their own development but also for purpose of the qualification needed for employment. The course also aims for participants to develop a curiosity on teaching and the basic competence needed for active participation in further opportunities for pedagogical development, i.e: courses, workshops, development projects etc... Finally, the course has the purpose of creating a network for organizational development in general and pedagogical development in particular at LTU.
Archived project
The development of accurate models and simulations is becoming increasingly important in fault detection and prevention techniques applied to a wide variety of engineered systems. The recent advances in measurement devices technology has provided the designer an incredible amount of data related to acoustic, thermal and optic behaviour of the material subject to crack generation and propagation mechanisms. The lack of a reliable model prevents a correct interpretation of these data and makes predictions of future evolution difficult to be performed. In this project, a different approach is considered: the kinematic behaviour is addressed under the assumption that the crack shape can be reconstructed through the application of a suitable and known set of deterministic rules. The aim is to propose an alternative approach to the development of a model for crack propagation by applying the NKS method. The problem firstly addressed is the simulation of mechanisms of crack branching and merging in 2D using a set of simple rules; the features of the resulting pattern is then considered and boundaries shapes, crack diffusion proper-ties, frequencies of branching and merging are studied.
Archived project
Delamination onset and propagation represent one of the most safety-critical failure modes in structures made of FRP laminates. Due to the widespread use of laminated composites in primary and secondary structures, the assessment of fracture behavior of FRP and the development of reliable analytical and numerical formulations for damage prediction are increasingly important themes to be addressed. Experimental procedures for the determination of fracture toughness have been developed for quasi-static conditions; while simulations have mainly dealt with quasi-static conditions for benchmarking and with impacts for prediction, which are difficult to compare with experimental measurement. Nonetheless, most of the applications in which composites are adopted are characterized by dynamic conditions and loading-rate effects. Thus, the study of loading-rate effects on delamination onset and propagation assumes a significant importance, although it has not been addressed much in the past. Loading-rate effects on delamination were addressed in a threefold way in the present work. Experimental observations were carried out on UD specimens under mode I, mode II and mixed mode I-II loading and on specimens with a 0/90◦ interface at the delamination front under mode I loading. For all the different lay-ups and loading conditions, four different velocities have been tested: 1, 50, 250 and 500 [mm/min]. SEM analysis was also carried out on delaminated surfaces under mode I loading both in UD and in the 0/90◦ interface. In the range of velocities analyzed, no dependence seems to be present for mode I, both in the UD and in the 0/90◦ interface, for mode II and for mixed mode I-II; differences are in the order of experimental scatter. A code was developed in Mathematica environment for the analysis and post-processing of frames of delamination propagation gathered during experiments, allowing for the extraction of more information from experiments with the use of simple optical devices. Dynamic numerical simulations were conducted in the FEM software ABAQUS, modeling the experiments performed. For mode I, mode II and mixed mode I-II with UD specimens, 3D models have been developed with hexahedral brick elements and a single layer of cohesive elements. Variations have also been studied: the presence of a cohesive layer with randomly distributed interface strengths has been analyzed for mode I, while the influence of initial lever misalignment has been addressed for mixed mode. For mode I with specimens with 0/90◦ interface, a 3D model has been developed with shell elements and with five layers of cohesive elements and intra-laminar damage modeling with the use of the Hashin criterion. Numerical models show a clear dependence on loading rate for all loading modes and lay-ups, except mode II with UD specimen; the agreement with experiments is good for quasi-static conditions. Initial lever misalignment does not have any significant influence. A simulation has also been performed of the cooling process following curing for the 0/90◦ laminated plate from which specimens were cut. Stress concentrations can be observed due to the mismatch in orientation between plies. Analytical models for DCB (mode I), ENF (mode II) and MMB (mixed mode I-II) specimens have been formulated on the base of the Euler-Bernoulli and Timoshenko beam.