Francesco Iacoviello | University of Cassino and Southern Latium (original) (raw)

Francesco Iacoviello

Francesco Iacoviello was born in 1966 in Rome; in 1989 he obtained the Laurea degree “cum laude” in Nuclear Engineering at the University of Rome “La Sapienza”. From 1992 to 2000 he was assistant Professor at University of Cassino. Between 1994 and 1998 he worked in the “Corrosion Fragilisation par l’Hydrogen” Laboratory (Ecole Centrale, Paris, France) and in 1997 he obtained the PhD degree in “Corrosion-Metallurgy” at Ecole Centrale Paris (France). Associated Professor from 2000 to 2005, since 2005 he is full professor of Metallurgy at the Faculty of Engineering of the University of Cassino.
Since 1997, he is the director of the Solids and Structure Mechanics Laboratory and from 2006 and 2009 he was the director of the PhD School of Engineering at University of Cassino. Since 2012, he is the responsible of the pedagogical activities of the Industrial Engineering courses at the University of Cassino.
His main research fields concern the analysis of fatigue crack propagation resistance and damaging micromechanisms of stainless steels, ductile cast irons, Al and Ti alloys, the investigation of stainless steels hydrogen embrittlement mechanisms and the analysis of stainless steels localized corrosion micromechanisms.
He is author of more than 200 papers published in international journals, conferences proceedings and books chapters and 1 patent.
Referee for many international journals (e.g., Corrosion Science, International J. of fatigue …), since 2007 he is chief editor of “Frattura ed Integrità Strutturale”, the official journal of “Italian Group of Fracture” (http://www.gruppofrattura.it).
Since 2009, he is President of the Italian Group of Fracture.
Since 2012, he is member of the ESIS ExCo (European Society of Structural Integrity).
Since 2013, he is member of the Director of ICF and member of the ExCo (International Congress on Fracture)
Since 2013, he is member of the Editorial Board of Theoretical and Applied Fracture Mechanics.
Since 2014, he is member of the Editorial Board of Scienza e Ricerche.
Since 2014, he is Vice-President of ESIS (European Society of Structural Integrity)
He organized and co-organized many national and international events (e.g., Italian Group of Fracture National meetings, Crack tip stress field workshops, Crack Paths 2013 etc.)
Guest editor in “Fatigue & Fracture of Engineering Materials & Structures” (36-1, 2013)
Guest editor in “International Journal of Fatigue” (46, 2013)
Guest editor in “Fatigue & Fracture of Engineering Materials & Structures” (36-9, 2013)
Since 2016, he is editorial responsible of “Procedia Structural Integrity”, ISSN 2452-3216.
Guest Editor of “International Journal of Fatigue”, 89 (2016).
Guest Editor di “Procedia Structural Integrity”, 1 (2016). ISSN 2452-3216.
Guest Editor di “Procedia Structural Integrity”, 2 (2016). ISSN 2452-3216.
Guest Editor di “International Journal of Fatigue”, 89 (2016).
Guest Editor di “Fatigue & Fracture of Engineering Materials & Structures”, 39(8) (2016).
Since 2016, he is member of the editorial board of “Fatigue & Fracture of Engineering Materials & Structures”.
Since 2016, he is member of the editorial board of “Integritet i vek konstrukcija – Structural Integrity and Life”.
In 2017 he was awarded with the “Constantine Tipper” Silver medal of the International Congress on Fracture.
Since 2017, he is Vice-President of ICF (International Congress on Fracture).
Phone: +39.07762993681
Address: via G. Di Biasio 43, 03043 Cassino (FR), Italy

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Papers by Francesco Iacoviello

Engineering Failure Analysis, 2017

Procedia Structural Integrity, 2017

Ductile irons offer a wide range of mechanical properties at a lower cost than the older malleabl... more Ductile irons offer a wide range of mechanical properties at a lower cost than the older malleable iron. These properties mainly depend on the shape characteristics of the metal matrix microstructure and on the graphite elements morphology; these geometrical features are currently evaluated by the experts visual inspection. This work provides an automatic procedure for a reliable standard estimation of the material microstructure morphology based on a novel image segmentation technique. The procedure has been successfully tested on specimens of different kinds of ductile irons of a typical production.

I meccanismi di danneggiamento nelle ghise sferoidali sono influenzati dalla matrice della micros... more I meccanismi di danneggiamento nelle ghise sferoidali sono influenzati dalla matrice della microstruttura e dalla presenza degli elementi di grafite. In questo lavoro sono stati investigati i meccanismi di danneggiamento in quattro ghise sferoidali ferrito-perlitiche sottoposte a sollecitazione di trazione mediante analisi delle superfici laterali dei provini al microscopio elettronico a scansione effettuate durante lo svolgimento della prova medesima (prove di trazione in situ). L'analisi di immagine quantitativa dell'evoluzione del danneggiamento ha permesso di quantificare l'evoluzione del processo, evidenziando l'importanza della microstruttura e l'importanza del ruolo svolto dagli elementi di grafite. L'importanza del distacco degli elementi di grafite dalla matrice metallica (debonding), spesso indicato come il principale o l'unico meccanismo di danneggiamento che coinvolge gli elementi di grafite, è confermata solo parzialmente.

ABSTRACT L&#39;analisi dei micromeccanismi di danneggiamento nelle ghise sferoidali si è ... more ABSTRACT L&#39;analisi dei micromeccanismi di danneggiamento nelle ghise sferoidali si è prevalentemente focalizzata sulle ghise sferoidali a matrice ferritica. In letteratura si è solitamente concentrata l&#39;attenzione sulla nucleazione di vuoti in corrispondenza degli sferoidi di grafite e sulla crescita di questi vuoti fino alla rottura catastrofica. Recentemente è stato verificato sperimentalmente che il ruolo svolto dagli sferoidi di grafite nelle ghise sferoidali a matrice ferritica è più complesso e che non può essere confinato al solo &quot;debonding&quot; dello sferoide dalla matrice ferritica. In questo lavoro vengono analizzati i micromeccanismi di danneggiamento a trazione in una ghisa sferoidale con matrice completamente perlitica mediante prove di trazione effettuate su microprovini ed osservazione al microscopio elettronico a scansione (SEM) della superficie laterale durante lo svolgimento della prova meccanica (prove &quot;in situ&quot;). Durante lo svolgimento della prova si è focalizzata l&#39;attenzione sia sul ruolo svolto dagli sferoidi di grafite che sull&#39;evoluzione del danneggiamento della matrice perlitica.

ABSTRACT La zincatura a caldo discontinua è una delle metodologie più diffuse per l’applicazione ... more ABSTRACT La zincatura a caldo discontinua è una delle metodologie più diffuse per l’applicazione di un rivestimento in grado di proteggere l’acciaio dalla corrosione generalizzata. L’efficacia di tale protezione è tuttavia influenzata dal livello di danneggiamento conseguente deformazioni plastiche di elevata entità sia di tipo statico che di tipo ciclico. Lo scopo di questo lavoro è quello di analizzare le proprietà meccaniche di laminati in acciaio zincato a caldo mediante prove di flessione cicliche eseguite con una procedura non standardizzata. Sono state analizzate due differenti tipologie di rivestimento: una prima, ottenuta con procedimento classico, ed una seconda ottenuta con un bagno di lega Zinco-Alluminio al 5% wt. Per ognuna di esse è stata ottenuta la risposta meccanica in termini di “deformazione angolare – coppia applicata” e lo stato di danneggiamento è stato analizzato mediante osservazione al microscopio ottico delle sezioni longitudinali, definendo come parametro di danno la densità di cricca, espressa in numero di cricche per unità di lunghezza di arco deformato. I risultati hanno permesso di determinare l’attitudine dei due rivestimenti alle lavorazioni plastiche a freddo ed il loro utilizzo in applicazioni soggette a carichi dinamici.

ABSTRACT Hot-dip galvanizing is one of the most used methods to apply zinc-based coatings on stee... more ABSTRACT Hot-dip galvanizing is one of the most used methods to apply zinc-based coatings on steels, in order to provide sacrificial protection against corrosion over all the steel surface. The efficiency of the protection is affected by the coating mechanical response to loading: cracking and coatings delamination during forming and/or during service could decrease the corrosion resistance and could allow the contact between the environment and the substrate (the steel). In this work, fatigue damaging mechanisms of hot dip zinc coated steel plates were investigated by means of a non-standard fatigue bending test performed considering high strain levels. Fatigue damaging micromechanisms were investigated by means of LOM (light optical microscope) analysis of metallurgically prepared longitudinal section of tested specimens, considering different applied cycle numbers (from 1 up to 1000).

Lecture Notes in Computational Vision and Biomechanics, 2014

ABSTRACT Ductile cast irons offer and interesting combination of overall mechanical properties an... more ABSTRACT Ductile cast irons offer and interesting combination of overall mechanical properties and technological peculiarities, allowing to obtain a high castability (peculiar of cast irons) with good tensile strength and toughness values (peculiar of steels). This result is due to their chemical composition that allows to obtain graphite elements in nodular shape directly from the melt. Ductile cast iron mechanical properties are strongly influenced both by the matrix microstructure and by the graphite nodules. The role of these elements cannot be merely ascribed to a simple matrixgraphite “debonding” damaging mechanism, but, according to previously published results, this role is more complex. In this work, customized image processing procedures were optimized to analyze the evolution of the damaging micromechanisms in a fatigue loaded ferritic ductile cast iron, focusing the graphite elements.

Fundamentals, Methods and Applications, 2012

ABSTRACT Hot-dip galvanizing is one of the most used methods to apply zinc-based coatings on stee... more ABSTRACT Hot-dip galvanizing is one of the most used methods to apply zinc-based coatings on steels, in order to provide sacrificial protection against corrosion over all the steel surface. In the last years new alloying elements on the Zn bath are studied to optimize properties oriented to new market requirements. In this work a new approach is proposed in order to quantify the main morphological properties of an ZnTiFe phase rich in Ti, present only in coatings produced by baths containing Ti. No quantitative studies have been yet carried out on intermetallic phases formation as consequence of Ti addition in the Zn bath. The innovative approach for ZnTi-based coatings has been applied to five different dipping times, thus allowing to evaluate the kinetic of formation.

Fundamentals, Methods and Applications, 2012

ABSTRACT Due to the peculiar graphite elements shape, ductile cast irons (DCIs) are able to combi... more ABSTRACT Due to the peculiar graphite elements shape, ductile cast irons (DCIs) are able to combine the high castability of gray irons with the toughness of steels. This result is obtained by means of a chemical composition control and not by means of an extended, and expensive, annealing treatment of white irons (that is necessary to obtain malleable irons). Focusing ferritic DCIs, different damaging micromechanisms should be investigated considering both ferritic matrix and the role played by graphite nodules: according to the observed micromechanisms, it is evident that graphite nodules role can’t be summarized with a simple “debonding”, usually considered as the only effective in numerical simulations. In this work, damaging micromechanisms in fatigue loaded ferritic DCI specimens were investigated by means of scanning electron microscope (SEM) during the fatigue test (“in situ” tests). Focusing graphite nodules, customized image processing procedures were optimized in order to quantify the evolution of damaging micromechanisms with the loading cycles number.

Lecture Notes in Computational Vision and Biomechanics, 2013

Frattura ed Integrità Strutturale, 2014

Engineering Failure Analysis, 2017

Procedia Structural Integrity, 2017

Lecture Notes in Computational Vision and Biomechanics, 2014

Fundamentals, Methods and Applications, 2012

ABSTRACT Hot-dip galvanizing is one of the most used methods to apply zinc-based coatings on stee... more ABSTRACT Hot-dip galvanizing is one of the most used methods to apply zinc-based coatings on steels, in order to provide sacrificial protection against corrosion over all the steel surface. In the last years new alloying elements on the Zn bath are studied to optimize properties oriented to new market requirements. In this work a new approach is proposed in order to quantify the main morphological properties of an ZnTiFe phase rich in Ti, present only in coatings produced by baths containing Ti. No quantitative studies have been yet carried out on intermetallic phases formation as consequence of Ti addition in the Zn bath. The innovative approach for ZnTi-based coatings has been applied to five different dipping times, thus allowing to evaluate the kinetic of formation.

Fundamentals, Methods and Applications, 2012

Lecture Notes in Computational Vision and Biomechanics, 2013

Frattura ed Integrità Strutturale, 2014

Atti del Convegno IGF9 , Jun 1993

Innovation Stainless Steel 1993 International Conference, Oct 1993

3rd international metallurgical symposium, May 1994

Idrogeno e metalli, May 1994

Fourth International Conference on Duplex Stainless Steels, Nov 1994

Third World Congress on Computational Mechanics, 1994

The fifth International Symposium on equipment for Structural Analysis, Mechanical testing and Technology Transfer, Sep 1994

Corrosion sous contrainte, Fatigue-Corrosion, Jun 1995

Nové materiàlya technologie, Sep 1995

Hydrogen and surface technology

Convegno IGF12 , Jun 1996

Localized Damage III Computer-Aided Assessment and Control, 1994

Hydrogen effects on material behaviour, 1994

Treccani - XXI Secolo, 2010

Acta Fracturae, Jul 1, 2013

Pseudo-elastic (PE) materials are an important class of metallic alloy which exhibit unique featu... more Pseudo-elastic (PE) materials are an important class of metallic alloy which exhibit unique features
with respect to common engineering metals. Because of these unique properties, PEs are able to recover their
original shape after high values of mechanical deformations, by removing the mechanical load (PE). From the
microstructural point of view shape memory and pseudo-elastic effects are due to a reversible solid state
microstructural diffusionless transitions from austenite to martensite, which can be activated by mechanical
and/or thermal loads. Copper-based shape memory alloys are preferred for their good memory properties and
low cost of production.
This paper describes the main crack initiation and its propagation in an tensile test in order to evaluate crack
path and its behaviour at low and at high values of deformation. Both grain boundary chemical properties and
X-ray diffraction will be discussed in order to correlate structural transition involved in an Cu-Zn-Al alloy
characterized by a PE behaviour.

Acta Fracturae, Jul 1, 2013

Versatility and higher performances at lower cost if compared to these of steels with analogous ... more Versatility and higher performances at lower cost if compared to these of steels with analogous
performances are the main advantages of Ductile Cast Irons (DCIs).
In the last years, the research group of Metallurgy of the Università di Cassino e del Lazio Meridionale deeply
investigated the damaging micromechanisms in ferritic pearlitic and austempered DCIs by means of tensile
and fatigue tests, mainly performing scanning electron microscope (SEM) or Digital Microscope (DM)
observations of specimens lateral surfaces during the tests (“in situ” tests).
In this work, graphite nodules mechanical behaviour is investigated by means of nano indentation tests and
results are compared with the damaging micromechanisms observed in ferritic DCIs.

Acta Fracturae, Jul 1, 2013

"Some Cu-Zn-Al alloy is able to exhibit an important feature: the Pseudo-Elastic behavior, commo... more "Some Cu-Zn-Al alloy is able to exhibit an important feature: the Pseudo-Elastic behavior,
commonly defined as PE alloy. The PE effect is the result of a non-diffusion microstructure changing
characterized by a good reversibility at environmental temperature. Furthermore, the copper-based shape
memory alloys are preferred for their good memory properties and low cost of production.
In this work, fatigue crack propagation and microstructural fracture micromechanisms are analyzed in order to
identify microstructure influence on fatigue behavior of Cu-Zn-Al PE alloy."

Acta Fracturae, Jul 1, 2013

The purpose of this paper is to study the phase transformation induced by the cold rolling of a C... more The purpose of this paper is to study the phase transformation induced by the cold rolling of a Cu-
Zn-Al alloy fabricated in our laboratories. Flat specimens were made from the alloy. They were subsequently
heat treated at 850°C/20 min, quenched in water at 100°C, treated at 320°C/30 min, quenched in water at
100°C, cooled in air up to room temperature.
To correlate the microstructure variations with the entity of the imposed deformation, the samples were cold
rolled selectively (each 2.5%) up to 15% of deformation. On each cold rolled sample, the microstructures were
investigated by LOM and XRD. The deformation has contributed to β3 (L21) ordering of the structure and to
occur the martensitic transformation. The martensite obtained is the M18R type.
This result shows that the parameter which most influences the type of obtainable martensite is determined by
the order of the parent phase. During testing it was found that the martensite enucleates in appreciable
quantities even at a level of deformation of 2.5% of the specimen. An increase of the martensite up to a
deformation of 15% was observed. It has not been possible to continue beyond this level of deformation, due
to the presence of transgranular cracks.

Acta Fracturae, Jul 1, 2013

Generally speaking the rockfall protection net wires are Zinc or Zn-Al coated. This provides to t... more Generally speaking the rockfall protection net wires are Zinc or Zn-Al coated. This provides to the
net a durable protection against corrosion. Due to their function, the rockfall protection nets can be damaged
over time, and must be replaced. The aim of this work is to investigate the damage that the wire undergoes
when subjected to “U” bending, in order to obtain a significant stress. Furthermore it has been analyzed the
behavior of a Zn-high Al coating in comparison with the coatings normally used.

Acta Fracturae, Jul 1, 2013

Ductile cast irons (DCI) mechanical properties are strongly influenced both by the matrix and by ... more Ductile cast irons (DCI) mechanical properties are strongly influenced both by the matrix and by
the graphite elements morphological peculiarities. These elements cannot be merely considered as “microvoids
embedded in a metal matrix”, but their presence implies a modification of the damaging micromechanisms,
depending on the metal matrix microstructure. In this work, a ferritic DCI has been considered. Tensile tests
have been performed on notched tensile specimen: quantitative image analysis approach has been applied in
order to analyze the possibility to consider the graphite nodules as indicators of the damaging level evolution.

Acta Fracturae, Jul 1, 2013

Ductile cast irons are characterized by an interesting mechanical properties combination (high d... more Ductile cast irons are characterized by an interesting mechanical properties combination (high
ductility, high tensile strength, good wear resistance). Graphite nodules morphological peculiarities and matrix
microstructure (both chemical composition and heat treatment controlled) strongly affect the mechanical
behaviour and the damaging micromechanisms, also considering very simple loading conditions (e.g. tensile test
conditions). Focusing ferritic ductile irons, matrix - graphite nodule debonding is often identified as the main
damaging micromechanism, and numerous studies provided analytical laws to describe growth of a single void,
depending on the void geometries and matrix behaviour. In this work, ferritic DCI damaging micromechanisms
were investigated, under uniaxial tensile tests, considering the triaxiality influence.

CompImage 2012, Sep 5, 2012

Due to the peculiar graphite elements shape, ductile cast irons (DCIs) are able to combine the h... more Due to the peculiar graphite elements shape, ductile cast irons (DCIs) are able to combine the
high castability of gray irons with the toughness of steels. This result is obtained by means of a chemical composition
control and not by means of an extended, and expensive, annealing treatment of white irons (that is
necessary to obtain malleable irons). Focusing ferritic DCIs, different damaging micromechanisms should be
investigated considering both ferritic matrix and the role played by graphite nodules: according to the observed
micromechanisms, it is evident that graphite nodules role can’t be summarized with a simple
“debonding”, usually considered as the only effective in numerical simulations. In this work, damaging
micromechanisms in fatigue loaded ferritic DCI specimens were investigated by means of scanning electron
microscope (SEM) during the fatigue test (“in situ” tests). Focusing graphite nodules, customized image processing
procedures were optimized in order to quantify the evolution of damaging micromechanisms with the
loading cycles number.

CompImage 2012, Sep 5, 2012

Hot-dip galvanizing is one of the most used methods to apply zinc-based coatings on steels, in o... more Hot-dip galvanizing is one of the most used methods to apply zinc-based coatings on steels, in
order to provide sacrificial protection against corrosion over all the steel surface. In the last years new alloying
elements on the Zn bath are studied to optimize properties oriented to new market requirements. In this
work a new approach is proposed in order to quantify the main morphological properties of an ZnTiFe phase
rich in Ti, present only in coatings produced by baths containing Ti. No quantitative studies have been yet
carried out on intermetallic phases formation as consequence of Ti addition in the Zn bath. The innovative
approach for ZnTi-based coatings has been applied to five different dipping times, thus allowing to evaluate
the kinetic of formation.

CompImage 2012, Sep 5, 2012

Tenacità e resistenza a fatica delle leghe metalliche, 2011

Una lancia che si rompe, una colonna fratturata, un serbatorio in pressione che esplode, un alber... more Una lancia che si rompe, una colonna fratturata, un serbatorio in pressione che esplode, un albero motore che si frattura, manufatti caratterizzati da un comportamento soddisfacente a temperatura ambiente che improvvisamente collassano in una fredda notte d’inverno. Tutti eventi catastrofici che, fino all’inizio del secolo scorso, venivano collegati unicamente al superamento di valori critici della sollecitazione unitaria applicata. L’approfondimento dei meccanismi di danneggiamento ha consentito di chiarire il ruolo svolto dalle difettosità del materiale, qualunque sia la loro origine, ovvero presenti già al momento della produzione (ad
esempio ottenute durante la solidificazione) o legate ai processi di lavorazione, oppure ancora, generate durante l’esercizio stesso del manufatto. Lo sviluppo dei difetti diventa quindi parte
integrante della vita stessa del manufatto e quest non visti esclusivamente come punti di intrinseca debolezza del materiale ma anche, e forse soprattutto, come concentratori e modificatori dello stato di sforzo.

In the last decades, damaging micromechanisms in ductile cast irons (DCIs) have been widely inves... more In the last decades, damaging micromechanisms in ductile cast irons (DCIs) have been widely investigated, considering both the matrix microstructure and the loading conditions influence. Considering the graphite nodules, they were initially considered as voids embedded and growing in a ductile metal matrix (especially considering ferritic ductile cast irons). Recent experimental results allowed to identify a more complex role played by the graphite nodules, depending on the matrix microstructure. In this work, damaging micromechanisms in a pearlitic DCI were investigated by means of tensile tests performed on notched specimen, mainly focusing the role played by graphite elements and considering the stress triaxiality influence.