Michel Arrigoni

ENSTA Bretagne · IRDL

Composite materials, among them Carbon Fiber Reinforced Polymers (CFRP), have become a key material in structural applications for lightweight structures such as spacecraft and aircraft. CFRP can be found under various quality grades and their mechanical performances increase with their cost and quality grade. In order to limit the costs of the mat...

To improve performances of engineered systems, laminate composite structures are widely used as they offer the best strength‐to‐weight ratio. However, maintenance and recycling of these structures still remain a challenge. One solution could be to disassemble the layers, without damaging them, so that they can be repaired, re‐used or recycled. To d...

Ultra-high molecular weight polyethylene (UHMWPE) composite materials are of interest for various applications because of their mechanical strength. They are obtained by plies pressing and their mechanical characteristics depend on the temperature pressing and heating cycle. In order to assess the out-of-plane cohesion of the resulting material, sp...

Unexploded historical ordnance (UXO) from World War II, that is discovered almost every week close to the French coast, must be destroyed quickly after discovery to ensure the safety of divers and ships. The favored destruction method is countermining, i.e., the use of a high-order detonation conducted by exploding an additional donor charge placed...

Smart flexible materials with piezoresistive property are increasingly used in the field of sensors. When embedded in structures, they would allow for in situ structural health monitoring and damage assessment of impact loading, such as crash, bird strikes and ballistic impacts; however, this could not be achieved without a deep characterization of...

Smart flexible materials with piezoresistive property are increasingly used in sensors field. When embedded in structures, they would allow an in-situ structural health monitoring and damage assessment of impact loading such as crash, bird strikes and ballistic impacts. However, this could not be achieved without a deep characterization of the rela...

We present a series of shock-wave measurements on aluminum based on the use of a simultaneous Photon Doppler Velocimetry (PDV) and triature velocity interferometer system for any reflector. Our dual setup can accurately measure shock velocities, especially in the low-speed range (<100 m s ⁻¹ ) and fast dynamics (<10 ns) where measurements are criti...

Composite materials are increasingly inescapable in engineered systems in various industrial fields, given their high strength to weight ratio for increasing autonomy, reducing energy consumption and enhancing mechanical strength of high added value products. However, their out-of-plane resistance could be improved by multimaterial assembly for str...

The complexities associated with the response of carbon fiber composites to different loading cases and methods of improving it without increasing their cost are still being researched. Herein, by an experimental approach, the ply‐level hybridization technique for tailoring the composite response is explored, and two different types of unidirection...

Composite materials are increasingly inescapable in engineered systems in various industrial fields, given their high strength to weight ratio for increasing autonomy, reducing energy consumption and enhancing mechanical strength of high added value products. However, their out-of-plane resistance could be improved by multimaterial assembly for str...

Unexploded historical ordnance (UXO) from World War II, that is discovered almost every week close to the French coast, must be destroyed quickly after discovery to ensure the safety of divers and ships. The favored destruction method is countermining, i.e., the use of a high-order detonation conducted by exploding an additional donor charge placed...

Laser Shock Peening (LSP) is a surface treatment technique for metallic materials. It induces plastic deformation at the surface of up to around 1 mm in depth. This process introduces residual stresses that lead to strain hardening, and potentially improvements in fatigue, stress corrosion cracking (SCC) and general corrosion behaviour in many, but...

This work reveals that the dynamic response of a spherical cap bubble in contact with a rigid wall depends on the effective contact angle at the instant prior to collapse. This parameter allows us to discriminate between two regimes in which the mechanisms of interaction between the collapsing bubble and its surrounding medium differ significantly:...

Dans le secteur des transports, de l'énergie ou bien de la défense, les structures peuvent être confrontées à diverses sollicitations dynamiques comme des impacts, des chutes ou encore des effets de souffle. Ces structures nécessitent un contrôle régulier ou approfondie après avoir été soumises à une sollicitation forte, pour assurer la pérennité d...

Increasing performance of an armament system often leads to increasing the maximal pressure inside the chamber or increasing the compacity of the system. Telescoped ammunition and the associated weapon (40 CTAS) developed by CTA International is a solution that combines both improvements. With the increase of maximal pressure, the equations of inte...

Results on mechanical properties of Tensylon� composites at room temperature are presented. Single-ply and two-ply samples, obtained from the ply-precursor sheet (of two orthogonal layers) have been subjected to: load till failure in traction, at different strain rates (below 10-1 s-1) and cycles of successive loading and unloading and 5 min stress...

The goal of the work presented in a two-companion paper is to pave the way for reliably assessing the risks of damage to buildings on the shore, induced by the detonation of unexploded historical ordnance (UXO) of large weights in variable shallow water environments with a water depth less than 50 m. The risk assessment is quantified through the se...

Exploring the mysteries of the universe, transporting people over longer distances in the safest way, providing energy to a growing global population, and facing environmental changes are among the major challenges that will face humanity in the coming decades: Satellite observations have become essential in monitoring the ecological health of the...

In various domains of material processing, such as surface cleaning and surface treatment, cavitation phenomenon may become an alternative to traditional methods if this phenomenon is well understood. Due to experimental and mathematical difficulties in theoretical models, it is still a challenge to accurately measure the physical mechanism of the...

High explosive hydro forming (HEHF) is a suitable technique for large metal plate forming. Manufacturing stages of such a part requires an adapted design of explosive charge configurations to define the mechanical loading exerted on the part. This mechanical loading remains challenging to be experimentally determined but necessary for predictive nu...

During hollow part casting, ceramic cores interact with molten metal injected in the part mould. For convenience this interaction can be, as a first step, investigated using a fluid presenting a similar viscosity (water) impacting a motionless simplified core geometry (cylinder). In the present study, this type of confined fluid/structure interacti...

The authors present the characterization of the behavior of a Carbon Fiber Reinforced Polymer (CFRP) under dynamic loading. The study deals with thin shields representative of the shields employed for satellite protection. The process was divided into two steps. First, experiments over a wide scale of strain rates were performed, including planar p...

Quality control on adhesively bonded aluminum plates is a crucial step for the lifespan of an engineered structure. LASer Adhesion Test (LASAT) is an appropriate solution for testing at local scale and with various amplitude ranges in dynamic conditions at very high strain rate. This method allows determining the laser energy for creating a shock t...

https://www.youtube.com/watch?v=SlpPwFF7Otc

The evaluation of blast effects from malicious or accidental detonation of an explosive device is really challenging especially on large buildings. Indeed, the time and space scales of the explosion together with the chemical reactions and fluid mechanics make the numerical model really difficult to achieve acceptable structural design. Nevertheles...

Societal concerns on security push light weight armor for ballistic protection to remain a topic of interest. Ultra-High Molecular Weight Polyethylene composites (UHMWPE) have shown appreciable performances for ballistic protection, because of their ability to mitigate kinetic energy of projectiles by various mechanisms of dissipation and because o...

Dynamic acoustic imaging of a surface wave propagating at an air–water interface is a complex task that is investigated here at the laboratory scale through an ultrasonic experiment in a shallow water waveguide. Using a double beamforming algorithm between two source–receiver arrays, the authors isolate and identify each multi-reverberated eigenbea...

Full collection, visit also: https://www.hindawi.com/journals/ace/si/624623/

This ADAP 2019 Annual Issue follows and extends the ADAP Special Volume of 2018 and aims at providing a further insight into current trends and recent advancements in design and analysis, experimental testing, and modelling of protective structures.

: Additive methods have become a key technology for the industry of high added value technology. Due to the powdered aspect of the input raw materials, the final product obtained by additive methods has some inherent microscale defects such as porosity and oxides as evidenced by microtomography and microscopic observations. It is then of interest t...

Ultra-High Molecular Weight Polyethylene (UHMWPE) composites are the result of recent developments in material research for ballistic protection due to their ability to absorb the kinetic energy of the bullet by various mechanisms of dissipation, among which an important one is delamination. In order to study this mechanism independently, the laser...

The workshop is aimed to solving problems in areas of Soft Target Protecting and is going to be organized in parallel with Future Forces Forum 2018. This event is a highly recognised international in defence & security field organised biennially in Prague and officially supported by the Czech Ministry of Defence, Armed Forces, Ministry of the Inter...

The dynamic imaging of a gravity wave propagating at the air-water interface is a complex task that requires the sampling of every point at this interface during the gravity wave propagation. Using two source-receiver vertical arrays facing each other in a shallow water environment, we manage to isolate and identify each multi-reverberated eigenbea...

Although the mechanical behavior of various types of laminated wood has been already explored in the literature [1, 2], there is still a lack about static and dynamic testing and modeling approaches of the plywood. This study aims to describe a plywood composed of 10 layers of beech glued together with a melamine-urea-formaldehyde resin. Tests were...

Ballistic protection is a matter of interest requested by civilian as well as military needs. The last decade has witnessed an increase in the use of light weight and efficient armour systems. These panels may be used for body protection as well as light vehicle protection against small calibres or to enhance the protection level of heavier vehicle...

The objective of this ADAP Special Issue volume is to provide an overview on the current trends and recent advancements in terms of design and analysis, including experiments and modelling, on protective structures. ...

We investigate the development of a sensor for dynamic pressure measurement. The sensor relies on a Bauer shock gauge of 25-μm thin Polyvinylidene fluoride (PVDF) film [AIP Conf. Proc 706:1121–1124, [21]. These gauges unfortunately require some skills to be integrated in an acquisition chain and the obtained results are strongly “experiment depende...

In a context where more and more Improvised Explosive Devices (IED) are found on national territories or theaters of external operations, the fight against IEDs has intensified since 2008, aiming, in particular, at designing reliable blast mitigation systems. Aqueous foams were identified in the 1970s as an efficient protective medium against blast...

underwater noise mitigation by the use of bubble curtains

Glass has been overwhelmingly used for windows and facades in modern constructions, for many practical reasons, including thermal, energy, light and aesthetics. Nevertheless, due to the relatively low tensile strength and mostly brittle behaviour of glass, compared to other traditional materials, as well as to a multitude of interacting structural...

My interview to the France2 news about bubble curtains efficiency for under water noise mitigation

In this paper, out-of-plane compression of criss-cross composite materials, i.e. materials with ply stacking sequence of [0∘/90∘]n, is studied experimentally and analytically. All these composite materials have some common properties, such as 90∘ rotation (around the axis perpendicular to the ply planes) symmetry in macroscopic properties; small pl...

Hydrodynamic ram (HRAM) is a phenomenon that occurs when a high-speed/high energy projectile penetrates a liquid-filled container. The container must adapt to allow the variation of volume of the cavity created, that generates a large loading due to the liquid momentum. This complex fluid–structure interaction phenomenon has been identified as one...

## Proceedings of ICSMESP 2017 - International Conference on Structural and Mechanical Engineering for Security and Prevention 2017, 14-16 June, Prague, CZ ## The determination of the blast protection level of civil engineering buildings components against explosive effects represents a topic of crucial importance, in current practice. However, so...

During a ballistic impact, the protective material that plays the role of armour has to dissipate the kinetic energy in order to limit the projectile penetration in the target. Our aim is to emphasis on the role played by a liquid-filled system on the impact energy mitigation due to cavitation inception and later bubble expansion. To observe this,...

In the event of impacts of high speed/high energy projectiles in liquid-filled tanks, the container may suffer large hydrodynamic loads that could possibly rupture the entire structure. This impact scenario is referred as hydrodynamic ram (HRAM) in the literature. To design an aircraft fuel tank that resists such HRAM events is a particularly diffi...

The dynamic imaging of a gravity wave propagating at the air-water interface is a complex task that requires the sampling of every point at this interface. Using two source-receiver vertical arrays facing each other in a shallow water environment, we manage to isolate and identify each multi-reverberated eigenray that interacts with the air-water i...

SGAMR cover (In. J. Struct. Glass Adv. Mater Res.) https://thescipub.com/sgamr

: This study looks into the dynamic behaviour of Al-base alloy components obtained by selective laser melting (SLM). This technology is an additive manufacturing process nowadays extensively used in high added-value sectors like aerospace and energy production, to obtain complex shape components with high microstructural and mechanical properties....

High speed forming processes such as magnetic pulse forming are gaining interest in the sheet metal industry. Their design and development require specific effort on numerical modelling as well as on the characterization of the high strain-rate mechanical behaviour of metals. Standard dynamic tests (SHPB, plate impact, simple tension…) are limited...

To reduce the vulnerability of both civilian and military aircraft, it is important to take the Hydrodynamic Ram (HRAM) effect into account when designing their fuel tanks. HRAM is especially dangerous for liquid-filled thin walled lightweight structures, that cannot be armoured due to weight penalty reasons. However, the response of the tank struc...

The use of thick carbon fibre reinforced thermosets appears recently for naval and offshore efficient design. However internal residual stresses are developed during the curing of thermosets, as shown by defects like fibre wavinesses, cracks and bubbles, especially with increasing thickness. The understanding of phenomena involved during the curing...