A5102794956- Laser Material Processing Techniques
- Laser-induced spectroscopy and plasma
- Surface Treatment and Residual Stress
- Diamond and Carbon-based Materials Research
- High-Temperature Coating Behaviors
- High-Velocity Impact and Material Behavior
- High-pressure geophysics and materials
- Laser-Plasma Interactions and Diagnostics
- Ion-surface interactions and analysis
- Planetary Science and Exploration
- Metal and Thin Film Mechanics
- Energetic Materials and Combustion
- Ocular and Laser Science Research
- Astro and Planetary Science
- Space Satellite Systems and Control
- Advanced Surface Polishing Techniques
- Advanced materials and composites
- Mechanical Behavior of Composites
- Fluid Dynamics and Heat Transfer
- Laser-Ablation Synthesis of Nanoparticles
- High Entropy Alloys Studies
- Welding Techniques and Residual Stresses
- Structural Response to Dynamic Loads
- Traumatic Ocular and Foreign Body Injuries
- Electromagnetic Launch and Propulsion Technology
École Nationale Supérieure de Mécanique et d'Aérotechnique
2011-2024
Centre National de la Recherche Scientifique
2009-2024
Institut Pprime
2013-2024
Université de Poitiers
2010-2018
Centre des Matériaux
2004-2012
ParisTech
2009-2012
École nationale supérieure de techniques avancées Bretagne
2011-2012
École nationale supérieure d'arts et métiers
2009-2012
CEA DAM Île-de-France
2009-2012
École Nationale Supérieure des Mines de Paris
2007-2012
This paper proposes a state-of-the-art laser adhesion test. It consists of testing material interfaces with laser-driven shock wave. Since the first demonstration in 1980s by Vossen, many studies and developments have been done. presents recent experiments on basic physics involved. Results show ability technique to perform quantitative test for wide range materials configurations. Edge effect principle ultra-short wave give perspectives new applications multi-layer combination material....
When a metal is shocked above its melting pressure or melted on release, the tensile stresses generated upon reflection of compressive pulse from free surface are induced into liquid state. Instead well-known spallation process observed in solid targets, cavitation expected material, and fragments ejected surface. Their size, velocity, temperature distributions issues increasing interest, as well their impact other nearby materials, but data limited subject. Here, we present an experimental...
Spallation induced by a laser driven shock has been studied for two decades on time scales of nanosecond order. The evolution technologies now opens access to sources whose pulse duration is under the picosecond, corresponding characteristic times numerous microscopic phenomena. In this ultra-short irradiation regime, spallation experiments have performed with time-resolved measurements free surface. These measurements, complemented post-test observations, compared numerical simulations...
The conditions of laser-driven shock wave loading lead to the study dynamic fracture in an unusual range stress and strain rates: 20–200 GPa more than 107 s−1. A cumulative damage criterion for spallation process has been included a one-dimensional finite difference hydrodynamic code. Numerical studies show effect different parameters: laser-pulse duration, peak induced pressure related incident intensity, target thickness. simulation results are agreement with shock-laser experiments on...
This paper deals with an adhesion test of coatings using laser-driven shock waves. Physical aspects concerning laser–matter interaction, wave propagation and interface fracture strength are described. comprehensive approach two numerical codes (HUGO SHYLAC) allows the determination mechanisms responsible for coating debonding a quantitative evaluation strength. From this description, protocol is also designed. To diagnose debonding, it based on analysis experimental rear free surface...
Spall damage in solid materials has been one of the most widely studied shock-induced phenomena for several decades, both applied and basic scientific motivations. Comparatively, very little data can be found yet about spallation liquid metals. In a recent paper, we have reported an exploratory investigation spall tin samples melted upon laser shocks high intensities. Here, present further experimental results obtained over lower pressure range, where focus on transition from ductile...
Laser driven shocks can lead to the dynamic failure, called spallation, of materials which undergo a tension at crossing two rarefaction waves. We present here numerical and experimental study ductile material scabbing with particular laser shock conditions (very short durations very high induced pressure levels). A cumulative damage criterion is implemented into both codes shylac radioss■. Experiments have been carried out by irradiation thin foils pure aluminum, copper, iron pulses three...
Dynamic fragmentation of shock-loaded metals is an issue considerable importance for both basic science and a variety technological applications, such as inertial confinement fusion, which involves high energy laser irradiation thin metallic shells. In this context, we present experimental numerical study debris ejection in targets (aluminum, gold, iron) where mainly governed by spall fracture occurring upon tensile loading due to wave interactions inside the sample. Experimental results...
First absolute equation of state measurements obtained for iron with laser driven shock waves are presented. The velocity and the free surface compressed have been simultaneously measured by using a VISAR diagnostic, step targets. pressure range 1–8 Mbar has investigated, which is directly relevant to planetary physics. experiments performed at Laboratoire pour l’Utilisation des Lasers Intenses Ecole Polytechnique.
Spallation of materials induced by laser driven shock waves is generally produced under uniaxial (one-dimensional (1D)) deformation irradiating a spot diameter much greater than the sample thickness. Here, two-dimensional (2D) effects are introduced in wave propagation drastically reducing loaded spot. Experiments performed on aluminium samples detect effect lateral propagation, both recovered and time-resolved VISAR measurements. Damage zones localized completely differently from that...
High power pulsed electrical discharges into liquids are investigated for new industrial applications based on the efficiency of controlled shock waves. We present here experimental data obtained by combination detailed high speed imaging equipments. It allows visualization very first instants plasma discharge formation, and then pulsations gaseous bubble with an accurate timing events. The time history expansion/compression this leads to estimation energy effectively transferred water...
Abstract The aim of this study was to compare three adhesion tests carried out on plasma-sprayed copper coatings aluminium substrates. first test, the bond pull designated EN 582 or ASTM C633, involves a uniaxial static stress and is commonly used in coating industry. second LASAT (LASer Adhesion Test), recently developed technique based spallation phenomenon due laser induced shock waves. In delamination results from at coating/substrate interface tensile stress. last bulge blister...
Research Article| May 01, 2006 Investigating impact demagnetization through laser impacts and SQUID microscopy Jérôme Gattacceca; Gattacceca 1CEREGE, CNRS/Université Aix-Marseille 3, France Search for other works by this author on: GSW Google Scholar Michel Boustie; Boustie 2Laboratoire de Combustion et Détonique, CNRS/ENSMA, Poitiers, Benjamin P. Weiss; Weiss 3Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts02139, USA Pierre Rochette; Rochette...
Dynamic fragmentation in liquid metals is an issue of increasing interest shock physics, both for basic and applied scientific motivations. In a recent paper, we have reported exploratory study spall tin samples melted upon laser-driven shocks. The need further experiments analyses to answer some questions raised by that work had been pointed out. Thus, present here complementary results, including specific recovery tests as well high speed transverse shadowgraphy visualize the expanding...
The propagation of laser-induced shock waves in a transparent epoxy sample is investigated by optical shadowgraphy. are generated focused laser (3 ns pulse duration—1.2 to 3.4 TW cm−2) producing pressure from 44 98.9 GPa. It observed that the wave and release created reverberation at rear face both followed dark zone pictures. This corresponds creation tensile resulting crossing on loading axis coming edge impact area (2D effects). After experiment, residual stresses targets identified...