
Vincenzo CrupiUniversity of Messina | UNIME · Dipartimento di Ingegneria
Vincenzo Crupi
PhD
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122
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Introduction
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November 2015 - December 2015
Publications
Publications (122)
The European Union guidelines require innovative solutions for reducing emissions in the maritime transport. Some investigations have been also conducted to underline the advantages of the electrification of the maritime transports, especially for medium-short range boats in comparison with traditional diesel power drives. This study is based on a...
The advancement in additive manufacturing has significantly expanded the use of lattice structures in many engineering fields. Titanium diamond lattice structures, produced by a direct metal laser sintering process, were experimentally investigated. Two cell sizes were selected at five different relative densities. Morphological analysis was conduc...
The increasingly stringent requirements—in terms of limiting pollutants and the constant need to make maritime transport safer—generated the necessity to foresee different solutions that are original. According to the European Maritime Safety Agency, the total number of reported marine casualties and incidents is 21.173 over the period 2014–2021, w...
The analysis of magnetic signature and the consequent identification of mitigation strategies are crucial issues in naval applications. The possibility to evaluate the magnetic signature of some essential components and structures during the design phase, represents an interesting opportunity to enhance ship design in terms of stealth capabilities....
Green composites have gained increasing attention in recent years as a sustainable alternative to traditional materials used in marine structures. These composites are made from biodegradable and renewable materials, making them environmentally friendly and reducing the subsequent carbon footprint. This review aims to provide a comprehensive overvi...
The study aims to develop an integrating risk-based formulation and cost-benefit analysis for identifying an optimal ship hull structural design solution where the steel cargo holds aluminium honeycomb sandwich panels to replace inner side shells. The risk of progressive structural failure includes hazards related to environmental pollution due to...
The ship hull structure is composed of plates and stiffened panels. Estimating the maximum load-carrying capacity, or the ultimate strength, of these structural components is fundamental. One of the main challenges nowadays is the implementation of new materials and technologies to enhance the structural integrity, economy, safety and environmental...
The present study makes a consistent attempt to evaluate promising additive manufacturing (AM) processes and materials for marine structural applications, paving the way for the development of additively manufactured lightweight composites. The main objective is to analyse the structural performances of fibre-reinforced plastics (FRP) produced by A...
Lightweight foam sandwich structures have excellent energy absorption capacity, combined with good mechanical properties and low density. The main goal of this study is to test the application of an innovative hybrid sandwich protective device in an offshore wind turbine (OWT). The results are useful for offshore structure applications. Different l...
Combination of lightweight and sustainable marine structures represents a crucial step to accomplish weight reduction and improve structural response. A key point when considering the reliability of innovative structural solutions, which should not be neglected, is represented by large-scale experimental investigations and not only by small-scale s...
The need of lowering the weight of ships makes it crucial to have superstructures made of aluminum alloy and the ship hull made of steel. Within this context, the connection between the two different metals becomes crucial as different metals are hardly weldable using traditional techniques. Thus Structural Transition Joints are extremely important...
In the last years, the idea of implementing greener and sustainable solutions merged with the basic principles of life cycle assessment concept has turned to be of paramount importance for the boatbuilding industry. In this framework, construction technologies based on wood such as strip-planking represent possible solutions, as they allow the use...
Integration of lightweight and sustainable solutions in marine structures design is essential to achieve weight reduction goals and improve structural response. A key step to assess the reliability of innovative structural solutions is represented by large-scale experimental investigation. The current paper deals with the analysis of a lightweight...
Integrating innovative solutions for ship design has always been a great challenge for the maritime sector due to complex design and construction processes. With this scenario in mind, the objective of this study was to develop a procedure to evaluate the potential benefits arising from the integration of innovative light-weight structures in ship...
This scientific study aims to validate the applicability of a micromechanical model for predicting the static shear strength of hybrid interfaces that are pressure-reinforced and bonded with anaerobic adhesives. To identify the parameters for the micromechanical model, a systematic experimental test plan involving high-strength steel butt specimens...
Welded joints are widely used in many sectors and represent the main joining technique also in the marine industry. The welded joints are sites of high stress concentrations and are subject to severe conditions for the marine environment. The design of marine welded joints has to consider the effects from wave loads, ship motions and loading/unload...
Quantitative thermographic methodology (QTM), which takes energy dissipation as a fatigue indicator, has been successfully applied to predict the fatigue life of materials and welded joints under constant amplitude loading. This study advances the QTM approach for predicting the fatigue life under variable amplitude loading in both low and high cyc...
Surveillance of hardly accessible areas is one of the most attractive perspectives for Unmanned Aerial Vehicles (UAV) application. Drones destined to ecosystems and environment surveillance must guarantee reliable flights, resistance to the specific environment, protection for the on-board devices and lightweight properties to be easily handled and...
In the next decades, Robotic Additive Manufacturing (RAM) will certainly represent a disruptive technology which will drastically change the traditional way of designing, manufacturing and supplying components. While many industrial sectors are successfully leveraging the Additive Manufacturing (AM) potential in order to develop and manufacture mor...
Weight reduction and materials sustainability are becoming of primary importance for marine structures. A solution to both issues could lie in the application of all-metal sandwich structures. The study suggests the substitution of common marine structures with aluminium honeycomb sandwich structures (AHS), as a green and lightweight alternative, t...
The aim of this research was the development and application of the following structural strain approaches for predicting the low-cycle fatigue life of AA 5083 welded joints: Finite Element equivalent structural strain approach and Digital Image Correlation equivalent structural strain approach. The first one was already applied for the low-cycle f...
The current paper is intended to provide an overview on the current state of the art for sandwich structures marine applications to support their wider application and identify the key issues to develop. A summary of current rules and standards on marine sandwich constructions is reported. The main critical points concerning design and qualificatio...
Experimental tests were carried out to assess the fatigue strength of four types of welded joints, made of AH36 steel and used for ship structures. The joints differ for the presence of weld defects and for the thickness value. Fatigue tests were carried out applying axial cyclic loads at a frequency of 20 Hz and at a stress ratio R = 0.5. The temp...
Offshore and oil & gas industries have shown the interest toward the use of dissimilar metals, so there is the problem of their joining. The aim of this research activity was to analyze the fatigue behaviour of Ti6Al4V/Inconel 625 (Nickel alloy 625) welded joint, obtained by laser welding. The investigated joint was obtained including intermediate...
Aluminium foam sandwich structures have excellent energy absorption capacity, combined with good mechanical properties and low density. Some of the authors of this paper proposed an innovative Metallic Foam Shell protective device against flying ballast impact damage in railway axles. A closed-cell aluminium foam was chosen for the Metallic Foam Sh...
The aim of the present investigation was to assess the behaviour of strip-planked parts by comparing wooden specimens glued using two different bio-based adhesives with wooden specimens glued using a conventional epoxy resin generally used in boatbuilding. Experimental tests in accordance with UNI EN standards were performed in order to evaluate me...
The AA 5083 aluminium alloy is widely used in high speed marine vehicles. The aim of this scientific work was to develop and validate a procedure, starting only from hardness measurements, to predict the elastic-plastic behavior of AA 5083 welded joints under static loading using non-linear FEA analyses. The hardness measurements allowed identifyin...
One of the most important design strategies for increasing the speed and/or efficiency of marine vehicles is that of weight reduction. This can be achieved by optimising structural design via judicious distribution of the most apt materials and via the application of innovative lightweight structures. Sandwich structures are ideal candidates for st...
Innovative thin-walled structures, bio-inspired by the microstructure of Morpho wings, were proposed as energy absorbing devices in this study. A finite element model, experimentally validated, was used to investigate the crush responses and deformation modes of 18 multi-layered tubes with different geometrical configurations. The crashworthiness p...
Materials and structures for marine applications are often required to combine high mechanical performance with lightness, but traditional solutions are not always adequate to the scope. The application of biomimetic science could provide innovative and efficient solutions, whose research is the aim of the present paper. In the current work, bamboo...
Although anaerobic adhesives are extensively used in addition to mechanical tightening in flanged couplings, interference fits, and threaded connections, their constitutive behaviour still needs to be investigated. According to the micromechanical model proposed by Dragoni and Mauri [Proc. of the IMECHE Part L J. of Mat.: Des. and Appl. 2002; 216:...
Aluminium honeycomb sandwich panels are an interesting lightweight structural solution for several applications such as marine structures, aerospace, automotive and aeronautics.
In many of these applications, in-service conditions produce fatigue loadings: as a result, safer use of aluminium honeycomb sandwich structures requires a deep knowledge o...
A procedure to simulate the non-linear behavior of explosion welded joints used for shipbuilding applications, starting only from hardness measurements, was developed. The explosion welded joints consist of three different materials: ASTM A516 structural steel, AA5086 aluminum alloy and an intermediate layer of pure aluminum. Three point bending te...
Honeycomb sandwich structures have excellent energy absorption capabilities, combined with good mechanical properties and low density. These characteristics make them ideal for the transportation industry, which has a growing interest in reaching higher safety standards. The purpose of the present paper is the introduction of lightweight and more e...
The aim of this research activity is to predict the low-cycle fatigue life of welded joints used for ship structures, applying two methods: the effective notch strain approach and the structural strain approach. The first method was applied performing elastic-plastic finite element analyses (FEA), using different cyclic stress-strain curves for bas...
One of the main focuses in transportation engineering is the application of sandwich materials in order to create safer and efficient vehicles. The main focus of this study was the application of 3D computed tomography for analyzing the responses of sandwich panels with micro lattice core subjected to impact loading. Micro lattice specimens were ma...
Nowadays explosion weld is widely used in marine structures, thanks to its reliability. AL/FE explosive welded joints, used in shipbuilding applications, were investigated in this research activity. Static and fatigue bending tests were carried out on rectangular specimens made of ASTM A516 low carbon steel, clad by explosion welding with A5086 alu...
The aim of this research activity was to study the fatigue behavior of laser welded joints of titanium alloy, in which the welding was performed using a laser source and in the absence of filler material, by means of unconventional full field techniques: Digital Image Correlation (DIC), and Infrared Thermography (IRT). The DIC technique allowed eva...
The design and the assembly of the vehicles subjected to the risk of crushing from falling objects have to consider such danger and provide the operators with suitable safety systems. Generally, falling object protective structures for earth moving machines consist of vertical elements, connected by transversal elements, covered by a roof. The latt...
Today, lightweight and low cost components can be obtained with short fibre reinforced plastics. The recyclable nature of these materials by comparison to thermoset matrixes composites is also clearly appealing.
The aim of this scientific work was the analysis of the micro lattice structures under uniaxial quasi-static compression loading with regard to the effect of unit cell size and strut diameter. A wide range of cubic lattice blocks designed in a CAD software were fabricated using Ti6Al4V (Ti64) metal powder and two different production parameters in...
As a common type of energy absorbers, thin-walled structures have been extensively used in crashworthiness application in many industries. The goal of this research is the optimisation of the crushing parameters of corrugated tubes in terms of the number and shape of corrugations. Six different configurations were experimentally investigated; one r...
This paper focuses on the study of a new energy-based approach for fatigue life prediction of pure copper based on thermographic measurement. The proposed method demonstrates two major improvements. The first improvement is the introduction of a new fatigue indicator by using the intrinsic dissipation instead of the apparent temperature. And the se...
Titanium alloys are increasingly used for structural applications in transportation engineering (aerospace, automotive, railway, marine industry) because of their interesting properties (high mechanical properties to weight ratios, excellent corrosion resistance). In the present research work, the very high cycle fatigue behaviour of Ti–6Al–4V allo...
In the last years, several approaches were developed in literature for predicting the fatigue strength of different kinds of materials. One approach is the Thermographic Method, based on the thermographic technique. This study is devoted to the development of a theoretical approach for modeling of surface and undersurface fatigue crack initiation a...
Two full-field techniques were applied for the study of the base material and welded specimens, made of S690QL steel: digital image correlation and thermographic techniques. Static and fatigue tests were carried out. The thermographic measurements can be used to predict the fatigue, with a great saving in time and effort. Fatigue tests at increasin...
This paper reports the experimental tests, which have been carried out to assess the mechanical properties of Iroko wood laminates used for the construction of a large wooden sailing ship. Three-point bending tests have been carried out on different types of specimens: laminates with 3 layers @ 0° and without scarf joints, laminates with 3 layers @...
Explosion welding is an effective method to join very dissimilar metals, which in the last years is adopted in many field of transportation industry to obtain a good compromise among the involved materials properties. In this work a commercial bar made of ASTM A516 low carbon steel, dad by explosion welding with A5086 aluminum alloy and provided wi...
The paper deals with investigations about mechanical properties of Iroko, a hardwood species used for structures in shipbuilding as glued laminated timber. Experimental tests have been carried out to assess strength, stiffness and density of Iroko in accordance with current EN Standards. All the results obtained by tensile and three-point bending t...
Honeycomb sandwich structures are increasingly used in the automotive, aerospace and shipbuilding industries where fuel savings, increase in load carrying capacity, vehicle safety and decrease in gas emissions are very important aspects. The aim of this study was to develop the theoretical methods, initially proposed by the authors and by other res...
The aim of this research is the investigation of foam-filled honeycomb sandwich panels under in-plane impact loading and the analysis of their crashworthiness. This paper presents a finite element analysis of foam-filled honeycomb sandwiches under in-plane impact loading. Three different aluminium honeycombs filled with three different polyurethane...
The application of composite materials for lightweight structures in the transportation engineering requires a better understanding of their impact response. The aim of this paper was the experimental investigation of different types of composites (laminated composites, PVC foam sandwiches, aluminium foam and honeycomb sandwiches, laminated wood) s...
There are many studies in literature on the thermal response of composites during static tests for a prediction of the fatigue limit, but only few studies about the thermal response of steels during static tests, and, as far as the authors are aware, this study is the first one about the application of the Thermographic Method during static tensile...
Currently, the technological progress in the engineering fields requires that the design lifetime of many components exceeds 107 loading cycles. The ultrasonic testing machines allow loading the specimen with 20kHz frequency, allowing reaching gigacycles within a relatively short time, but the high value of frequency produce a high heating of the s...
In this paper, the influence of foam filling of aluminum honeycomb core on its in-plane crushing properties is investigated. An aluminum honeycomb core and a polyurethane foam with densities of 65, 90, and 145 kg/m3 were used to produce foam filled honeycomb panels, and then experimental quasi-static compression tests were performed. Moreover, fini...
Sommario
La leghe di titanio sono sempre più largamente utilizzate nell'industria dei trasporti (aerospaziale, automotive, ferroviario e navale) per le loro interessanti proprietà (l'elevato rapporto resistenza-peso specifico e la loro eccellente resistenza alla corrosione in ambienti ossidanti). Nel presente lavoro di ricerca sono state effettuat...
The welded structures used in the naval field are generally subjected to fluctuating stress over time. In some structural welded details, due to changing loading conditions, significant elastic-plastic deformation can arise, which may lead to the failure of the structure after a relatively low number of cycles. The aim of this scientific work was t...
With the increasing progress of the technological development in the transport industry, the required fatigue life has increased, so it is very important to determine a safe fatigue strength for 109 cycles. Nowadays, the very high cycle fatigue constitutes one of the main fatigue design criteria for applications in transport industry. In this paper...
Experimental tests have been carried out in order to investigate the influence of the heat treatments on the microstructures and mechanical properties of FV520B stainless steel. The fatigue strength of the common and heat-treated FV520B steels was rapidly assessed using the lock-in infrared thermographic methodology. Good agreements were achieved b...
The use of sandwich structures combines low weight with high energy absorbing capacity, so they are
suitable for applications in the transport industry (automotive, aerospace, shipbuilding industry), where
the “lightweight design” philosophy and the safety of vehicles are very important aspects. The goal of
this paper was the analysis of the bendin...
Welded joints in ship structures are subject to several variable loadings which may lead to fracture after a
relatively low number of cycles. This behaviour is not always fully described by high-cycle fatigue
predictions, so low-cycle fatigue has also to be assessed, considering plastic deformation. Local
approaches are applied in these cases and a...
The aim of this scientific work was to investigate the behaviour of cruciform welded joints under static
loading using a full-field technique: Digital Image Correlation. The material curves, relative to different zones (base
material, heat affected zone, weld), were obtained by hardness measurements, which were done by means of a fully
automated ha...
Nowadays, many components and structures are subjected to fatigue loading with a number of cycles higher
than 107. In this scientific work, the behaviour of two kinds of tool steel was investigated in very high cycle
fatigue regime. The fatigue tests were carried out at the frequency of 20 kHz and in fully reversed tensioncompression
mode (R = -1)...
The honeycomb sandwiches are widely used in the transportation engineering for the
realization of lightweight and crashworthy structures. However their application requires
a better understanding of their impact response. Aims of this paper are the numerical
investigation of aluminium honeycomb sandwiches subjected to low-velocity impact tests
and...
The goal of this research was the analysis of edgewise bending response of sandwiches, which consists of aluminium honeycomb sandwich reinforced by outer skins made of glass fiber reinforced epoxy matrix. The test results at different values of support span distances in terms of peak loads and absorbed energy were compared with those obtained by fl...
The use of lightweight aluminium sandwiches in the shipbuilding industry represents an attractive and interesting solution to the increasing environmental demands. The aim of this paper was the comparison of static and low-velocity impact response of two aluminium sandwich typologies: foam and honeycomb sandwiches. The parameters which influence th...
Ship structures are generally subjected to cyclic loads which may result in fatigue failures
particularly at welded joints. In addition to loads induced by waves and structural vibrations,
which contribute to high-cycle fatigue, various structural details are also subjected to a limited
number of high stress cycles caused by changing loading condit...