Papers by Michel Arrigoni
HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific r... more HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. Blast waves propagation and their mitigation Steven Kerampran, M. Arrigoni, Paul Locking
HAL (Le Centre pour la Communication Scientifique Directe), Aug 28, 2022
Proceedings of the 32nd International Symposium on Ballistics, May 9, 2022
Increasing performance of an armament system often leads to increasing the maximal pressure insid... more 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 interior ballistics might not be appropriate anymore since the models were established when the pressure was moderated. The aim of this paper is to compare the potential candidates for the equation of state of the combustion gases in a high-pressure system, such as telescoped ammunition. Within this study, the following equations of state are studied: ideal gas equation, Noble-Abel equation, Van der Waals equation and virial equation. The study is divided in two: a first study for air as the coefficients needed are easily accessible in the literature and a second study for combustion products stemming from propellant combustion.
International Congress on Applications of Lasers & Electro-Optics
HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific r... more HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. Blast waves propagation and their mitigation Steven Kerampran, M. Arrigoni, Paul Locking
Ce travail présente les étapes vers la fabrication d’un capteur de pression universel possédant u... more Ce travail présente les étapes vers la fabrication d’un capteur de pression universel possédant une large dynamique de mesure comprise entre une fraction de kPa jusqu’à des dizaines de GPa en amplitude et avec une large bande passante allant de quelques fractions de Hz jusqu’à quelques centaines de MHz en fréquence. L’élément principal est une jauge de contrainte de type “Bauer shock gauge” élaborée à partir de difluorure de polyvinylidène (PVDF) disponible sur le marché. Un assemblage comportant cette jauge est utilisé comme un hydrophone flottant. De part sa minceur, cet hydrophone demeure peu intrusif dans l’eau et résiste aux chocs. Il est montré que cet hydrophone est linéaire en amplitude et possède une sensibilité en fréquence modérément variable. Il offre une précision comparable à celle des hydrophones classiques dans leur domaine d’application. Comme inconvénient, le dispositif proposé dépend fortement de l’orientation et ne peut donc être utilisé que dans des expériences ...
European Journal of Mechanics - B/Fluids, 2018
Hydrodynamic ram (HRAM) is a phenomenon that occurs when a high-speed/high energy projectile pene... more 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 of the major threat to aircraft safety. An approach based on bubble dynamics models has been developed by the authors to take this phenomenon into account when designing fuel tanks. In the present work, the authors compare ALE finite element simulations using EUROPLEXUS to a modification of the Keller-Miksis model to account for the confinement effect of the container. In the studied domain, the agreement on the cases simulated is found quite acceptable: 3% and 1% differences respectively in amplitude and period for the bubble dynamic and less than 1% for the impulse transmitted to the structure.
Key Engineering Materials, 2017
During a ballistic impact, the protective material that plays the role of armour has to dissipate... more 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, small scale experiments have been carried out on a three layers sample (Aluminium-Water-PMMA) submitted to shock waves induced by laser impact applied on the Al face. Rapid camera visualizations allow reproducing, at small scale, the effects of projectiles on armours for various monitored impact energies. We observe the formation of bubbles for sufficiently intense impacts due to traction effects in the water caused by the multiple reflections of waves within the sample. The cavitation threshold of water under dynamic loading is then experimentally investigated for two samples: one with 600 μm thick Al / 400 μm of water and 3 mm of PMMA, t...
Matériaux & Techniques, 2012
Dans un contexte de mise en oeuvre croissante des composites dans les secteurs aéronautiques et d... more Dans un contexte de mise en oeuvre croissante des composites dans les secteurs aéronautiques et de la défense, la compréhension de leur comportement sous choc et de l'endommagement induit est un point crucial développé dans cette étude. Des laser impulsionnels intenses sont mis en oeuvre pour la génération d'impacts localisés et calibrés sur ces matériaux complexes, supportés par de nombreux diagnostics en temps réel et post-choc pour l'étude et la quantification de l'endommagement dynamique.
Journal of Fluid Mechanics
This work reveals that the dynamic response of a spherical cap bubble in contact with a rigid wal... more 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: when the contact angle is smaller than $90^{\circ }$ , a classical jet directed towards the wall is observed, whereas if the initial contact angle is larger than $90^{\circ }$ , an annular re-entrant jet parallel to the wall appears. We show that this change of behaviour can be explained using the impulse potential flow theory for small times, which shows the presence of a singularity on the initial acceleration of the contact line when the contact angle is larger than $90^{\circ }$ . Direct numerical simulations show that although viscosity regularises the solution at $t > 0$ , the solution remains singular at $t=0$ . In these circums...
Materiale Plastice, Apr 4, 2022
Results on mechanical properties of Tensylon ® composites at room temperature are presented. Sing... more 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 relaxation period. The characteristic times of relaxation are evaluated and the difference in values of Young modulus before and after the relaxation stage is established. A complex cyclic/relaxation test requires a visco-elasto-plastic model of Tensylon ® , and allows for quantifying it. This model predicts the material behavior in other types of tests: for instance, it predicts strain rate independence of loading to failure in the considered strain rate range. Cyclic tests fulfilled at a fixed (constant) strain rate suggest that Tensylon ® is an elastoplastic material without noticeable viscosity. The proposed model, additively including nonlinear viscoelasticity and plastic flow with strengthening, shows a satisfactory agreement with experimental data. It also agrees that the material is strain-rate-insensitive in the range 10-3 s-1-10-1 s-1 .
It is important to protect critical infrastructure buildings, such as shopping centres, governmen... more It is important to protect critical infrastructure buildings, such as shopping centres, government buildings and embassies as well as structures of traffic infrastructure (networks and utilities) from being damaged, destroyed or disrupted by deliberate acts of terrorism, criminal activity and malicious behaviour. Normal regulations and building guidelines do not generally take into account these unexpected threats. The introduction of appropriate regulations or guidelines, where deemed necessary, should enhance the resilience of buildings and infrastructures against explosion incidents. In order to protect the built infrastructure, testing methods are required which can answer the question as to whether specific building elements can withstand extraordinary high loading conditions created by an explosive event. The applicable state-of-the-art techniques may include either experimental or numerical methods, or a combination of both. Therefore, the thematic group (TG) on the resistance of structures to explosion effects was formed in order to bring the required expertise, to make it accessible and to find and define harmonised methods and solutions which can be provided to the decision-makers responsible for critical infrastructure protection. The TG described in a first report [JRC87202] the physical phenomena which have to be understood in order to ensure proper testing of the building elements and correct interpretation of the results. In a second step, the differences between the existing standards for testing blast-resistant glazing and windows have been derived, and a basis for fundamental recommendations for the future development of the suite of European Standards has been addressed [JRC94930]. It describes recommendations for improvements of the current test standards. The report at hand takes the findings of the report [JRC94930] into account. It formulates suggestions for the implementation of improvements of existing testing standards for the evaluation of explosive resistance of security glazing products. New and adapted text passages are provided as suggestions for improvements. Thereby the structure and the format of the existing testing standards EN13123-1 and EN13124-1 were taken as the basis. Thus, the original formulations and the suggestions for adaptations are provided in one document. This document presents only the suggestions for the modifications of the shock tube testing procedure. The recommended modifications to the existing standards EN13123-2 and EN13124-2 for arena testing based on the findings of [JRC94930] will be presented in another document
International Journal of Computational Methods and Experimental Measurements, 2016
To reduce the vulnerability of both civilian and military aircraft, it is important to take the h... more 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 structure during HRAM events depends on a coupling model between fluid and structure. Water is generally used as a liquid candidate for experimental observations of HRAM, since it is a safe and affordable solution. However, its characteristics in thermal transfers are far different from the ones of hydrocarbons, and it may influence the bubble behaviour and thus its resulting loading on the tank walls. A good understanding of all these aspects is still needed to enhance the tank designs. Similarities in bubble behaviour between HRAM and underwater explosion situations were observed in recent high-speed tank penetration/water entry experiments. A confined version of the Rayleigh-Plesset equation-which is classically used for bubble dynamics analysis (including underwater explosion)-has been previously proposed to simulate a bubble created by an HRAM event. The work the presented work is a first attempt to the estimation of the influence of thermal effects in HRAM processes, by using the Rayleigh-Plesset equation in confined regime.
The Journal of the Acoustical Society of America, 2019
Dynamic acoustic imaging of a surface wave propagating at an air-water interface is a complex tas... more 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 eigenbeam that interacts with the air-water and bottom interfaces. The waveguide transfer matrix is recorded 100 times per second while a low-amplitude gravity wave is generated by laser-induced breakdown at the middle of the waveguide, just above the water surface. The controlled, and therefore repeatable, breakdown results in a blast wave that interacts with the air-water interface, which creates ripples at the surface that propagate in both directions. The amplitude perturbations of each ultrasonic eigenbeam are measured during the propagation of the gravity-capillary wave. Inversion of the surface deformation is performed from the amplitude variations of the eigenbeams using a diffraction-based sensitivity kernel approach. The accurate ultrasonic imaging of the displacement of the air-water interface is compared to simultaneous measurements with an optical camera, which provides independent validation.
IEEE Journal of Oceanic Engineering, 2022
The goal of the work presented in a two-companion paper is to pave the way for reliably assessing... more 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 seismic magnitude on the Richter scale, induced by the detonation of charges of different weights (between 80and 680-kg TNT-equivalent). This metric is investigated experimentally using a coupled seismo-acoustic approach within the framework of a UXO clearance (countermining) campaign in the Mediterranean Sea. Analysis of real acoustic and seismic data shows that, compared to a charge detonation in water, a similar detonation on the seabed generates seismic signals of lower frequencies and higher amplitudes that propagate in the seabed. The larger the charge weight, the higher the seismic amplitude. Besides the explosion-coast distance, the ...
Sensors, 2021
High explosive hydro forming (HEHF) is a suitable technique for large metal plate forming. Manufa... more 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 numerical simulation in the design of parts to form. Providing that the actual mechanical impulse would allow the neglecting of the modelling of the detonation stage, this considerably increases the computational time. The present work proposes an experimental method for obtaining the exerted mechanical loading by HEHF on the part to form. It relies on the development of low-cost sensor based on a polyvinyliden fluorid (PVDF) gauge. In addition to it, an analytical approach based on shock physics is proposed for the sensor signal interpretation. The method considers the multi-layer aspect of the sensor and its intrusiveness with respect to w...
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Papers by Michel Arrigoni