Mitch Boustie - Academia.edu (original) (raw)
Papers by Mitch Boustie
HAL (Le Centre pour la Communication Scientifique Directe), Aug 28, 2022
Proceedings of SPIE - The International Society for Optical Engineering, 2008
International Congress on Applications of Lasers & Electro-Optics
This paper presents the study of basalt under shock induced by laser in water confinement regime.... more This paper presents the study of basalt under shock induced by laser in water confinement regime. A model is developed to reproduce rear free surface velocity measured by Velocimetry interferometer for any reflector. Computation is in agreement with experiments. Material properties of basalt could be used for works aiming to correlate residual effects in material with pressure levels induced by water confined laser-matter interaction.This paper presents the study of basalt under shock induced by laser in water confinement regime. A model is developed to reproduce rear free surface velocity measured by Velocimetry interferometer for any reflector. Computation is in agreement with experiments. Material properties of basalt could be used for works aiming to correlate residual effects in material with pressure levels induced by water confined laser-matter interaction.
of spallation by sub-picosecond laser driven shocks
High performance epoxies are more and more used for structural applications, namely for naval and... more High performance epoxies are more and more used for structural applications, namely for naval and offshore structures as well as for aeronautical and aerospace structures. It is well known today that internal residual stresses are developed during the curing of thermosetting materials. However, several defects like cracks and bubbles inside of the matte r might arise, especially with increasing thickness. These defects may provoke serious damages within the concerned structure in service, especially unde r dynamic solicitations. In order to offer a better quality control, pulsed lasers have recently been used in non destructive inspection and characterization of composites [[1]]. This work focuses on internal gradients of properties generat ed during the curing and their consequences on the dynamical behavior of the epoxy matrix LY 556 . To do this, couplings induced by the curing between the chemistry, the thermal and the mechanics of the matrix in progress are presented and are ta...
International Congress on Applications of Lasers & Electro-Optics, 2008
This paper presents a new technique using laser induced spallation to deposit coatings. Experimen... more This paper presents a new technique using laser induced spallation to deposit coatings. Experiments show that spall parameters (thickness and flight velocity) can be measured. Spall(Aluminum)-target substrate(Copper) interface observation evidences local thermal mechanism which responsible for adhesion. This technique offers a new perspective to study highly dynamic process of deposition.This paper presents a new technique using laser induced spallation to deposit coatings. Experiments show that spall parameters (thickness and flight velocity) can be measured. Spall(Aluminum)-target substrate(Copper) interface observation evidences local thermal mechanism which responsible for adhesion. This technique offers a new perspective to study highly dynamic process of deposition.
AIP Conference Proceedings, 1996
Thick 450 mum piezoelectric VF2/VF3 copolymer and thin 25 mum PVDF gages have been used to measur... more Thick 450 mum piezoelectric VF2/VF3 copolymer and thin 25 mum PVDF gages have been used to measure the induced pressure history at the back face of aluminum and copper targets irradiated by infra-red laser pulses† of 2.5 ns with intensities up to 7.1011 W/cm2. The measured pressures in the gages infer pressures up to 200 kbar on the front face
AIP Conference Proceedings, 1998
We have extended the SRI ductile fracture model (DFRACT) for spall behavior of aluminum and coppe... more We have extended the SRI ductile fracture model (DFRACT) for spall behavior of aluminum and copper. The temperature computation procedure, thermal strength reduction function, work hardening, and Bauschinger effects from the Steinberg model were added. The threshold stress for void growth in the DFRACT model was equated to the stress for general yielding in the Carroll-Holt model for porous materials.
Matériaux & Techniques, 2015
The Review of scientific instruments, 2014
High power pulsed electrical discharges into liquids are investigated for new industrial applicat... more High power pulsed electrical discharges into liquids are investigated for new industrial applications based on the efficiency of controlled shock waves. We present here new experimental data obtained by combination of detailed high speed imaging equipments. It allows the visualization of the very first instants of plasma discharge formation, and then the pulsations of the gaseous bubble with an accurate timing of events. The time history of the expansion/compression of this bubble leads to an estimation of the energy effectively transferred to water during the discharge. Finally, the consecutive shock generation driven by this pulsating bubble is optically monitored by shadowgraphs and schlieren setup. These data provide essential information about the geometrical pattern and chronometry associated with the shock wave generation and propagation.
Lasers in Synthesis, Characterization, and Processing of Diamond, 1998
Two types of carbon materials after the powerful laser influence were studied. First - low grade ... more Two types of carbon materials after the powerful laser influence were studied. First - low grade pyrolitic graphite, second - 10 micron film of the amorphous line- chain carbon. The film was prepared by the method of Ar ion assisted deposition of carbon plasma. The samples were irradiated by a 1.06 micro wavelength Nd laser in vacuum 0.3 Pa. The
Debonding of coatings on a substrate is currently achieved by the so-called laser spallation tech... more Debonding of coatings on a substrate is currently achieved by the so-called laser spallation technique. Here, we give an interpretation of the debonding by laser shock based on the impedance mismatch between the substrate and the coating rather than on the spallation process. An analysis in the (pressure-particle velocity) plane coupled with (space-time) diagrams provides the stress history at the
AIP Conference Proceedings, 2012
ABSTRACT Laser driven shocks allow to investigate materials behavior at very high strain rate (10... more ABSTRACT Laser driven shocks allow to investigate materials behavior at very high strain rate (10^7s-1) and presents a great interest for research applications. Microscopic simulations of ultra-short laser driven shock on micrometric Tantalum single-crystals have been performed by using the CEA-DAM Classical Molecular Dynamics code. This method, complementary to continuum models, provides an analysis the microscopic processes related to damage (ductile pore nucleation and growth) which occurs during spallation. This results are compared to spallation experiments data (VISAR signals, micro-tomography) obtained with the LULI100TW femtosecond laser in order to validate the MD behavior. Moreover, in the framework of a multi-scale approach, we show the possibility to use MD simulation to fit macroscopic damage models. This method is illustrated with an application to the parameters determination of the Kanel criterion. This also shows the high strain rates involved during damage process, around 10^9s-1, allow to approach the inter-atomic theoretical cohesion stress threshold.
AIP Conference Proceedings, 2008
When a shock-loaded target is melted on compression or on release, the tensile stresses generated... more When a shock-loaded target is melted on compression or on release, the tensile stresses generated upon reflection of the pressure pulse from a free surface are induced in a liquid state. Instead of the well-known spallation process occurring in solid targets, cavitation takes place in the melted material and liquid fragments are ejected from the free surface. Although increasing interest
Surface Engineering, 1994
Surface and Coatings Technology, 2001
This paper presents a set of laser shock debonding experiments performed using two kinds of targe... more This paper presents a set of laser shock debonding experiments performed using two kinds of targets constituted of a Ni-base substrate covered with coatings of platinum several micrometers thick. By applying laser shocks of increasing amplitude with different pulse durations between 600 ps and 3 ns, the decohesion of the coatings was observed above a threshold intensity. Depending on the
HAL (Le Centre pour la Communication Scientifique Directe), Aug 28, 2022
Proceedings of SPIE - The International Society for Optical Engineering, 2008
International Congress on Applications of Lasers & Electro-Optics
This paper presents the study of basalt under shock induced by laser in water confinement regime.... more This paper presents the study of basalt under shock induced by laser in water confinement regime. A model is developed to reproduce rear free surface velocity measured by Velocimetry interferometer for any reflector. Computation is in agreement with experiments. Material properties of basalt could be used for works aiming to correlate residual effects in material with pressure levels induced by water confined laser-matter interaction.This paper presents the study of basalt under shock induced by laser in water confinement regime. A model is developed to reproduce rear free surface velocity measured by Velocimetry interferometer for any reflector. Computation is in agreement with experiments. Material properties of basalt could be used for works aiming to correlate residual effects in material with pressure levels induced by water confined laser-matter interaction.
of spallation by sub-picosecond laser driven shocks
High performance epoxies are more and more used for structural applications, namely for naval and... more High performance epoxies are more and more used for structural applications, namely for naval and offshore structures as well as for aeronautical and aerospace structures. It is well known today that internal residual stresses are developed during the curing of thermosetting materials. However, several defects like cracks and bubbles inside of the matte r might arise, especially with increasing thickness. These defects may provoke serious damages within the concerned structure in service, especially unde r dynamic solicitations. In order to offer a better quality control, pulsed lasers have recently been used in non destructive inspection and characterization of composites [[1]]. This work focuses on internal gradients of properties generat ed during the curing and their consequences on the dynamical behavior of the epoxy matrix LY 556 . To do this, couplings induced by the curing between the chemistry, the thermal and the mechanics of the matrix in progress are presented and are ta...
International Congress on Applications of Lasers & Electro-Optics, 2008
This paper presents a new technique using laser induced spallation to deposit coatings. Experimen... more This paper presents a new technique using laser induced spallation to deposit coatings. Experiments show that spall parameters (thickness and flight velocity) can be measured. Spall(Aluminum)-target substrate(Copper) interface observation evidences local thermal mechanism which responsible for adhesion. This technique offers a new perspective to study highly dynamic process of deposition.This paper presents a new technique using laser induced spallation to deposit coatings. Experiments show that spall parameters (thickness and flight velocity) can be measured. Spall(Aluminum)-target substrate(Copper) interface observation evidences local thermal mechanism which responsible for adhesion. This technique offers a new perspective to study highly dynamic process of deposition.
AIP Conference Proceedings, 1996
Thick 450 mum piezoelectric VF2/VF3 copolymer and thin 25 mum PVDF gages have been used to measur... more Thick 450 mum piezoelectric VF2/VF3 copolymer and thin 25 mum PVDF gages have been used to measure the induced pressure history at the back face of aluminum and copper targets irradiated by infra-red laser pulses† of 2.5 ns with intensities up to 7.1011 W/cm2. The measured pressures in the gages infer pressures up to 200 kbar on the front face
AIP Conference Proceedings, 1998
We have extended the SRI ductile fracture model (DFRACT) for spall behavior of aluminum and coppe... more We have extended the SRI ductile fracture model (DFRACT) for spall behavior of aluminum and copper. The temperature computation procedure, thermal strength reduction function, work hardening, and Bauschinger effects from the Steinberg model were added. The threshold stress for void growth in the DFRACT model was equated to the stress for general yielding in the Carroll-Holt model for porous materials.
Matériaux & Techniques, 2015
The Review of scientific instruments, 2014
High power pulsed electrical discharges into liquids are investigated for new industrial applicat... more High power pulsed electrical discharges into liquids are investigated for new industrial applications based on the efficiency of controlled shock waves. We present here new experimental data obtained by combination of detailed high speed imaging equipments. It allows the visualization of the very first instants of plasma discharge formation, and then the pulsations of the gaseous bubble with an accurate timing of events. The time history of the expansion/compression of this bubble leads to an estimation of the energy effectively transferred to water during the discharge. Finally, the consecutive shock generation driven by this pulsating bubble is optically monitored by shadowgraphs and schlieren setup. These data provide essential information about the geometrical pattern and chronometry associated with the shock wave generation and propagation.
Lasers in Synthesis, Characterization, and Processing of Diamond, 1998
Two types of carbon materials after the powerful laser influence were studied. First - low grade ... more Two types of carbon materials after the powerful laser influence were studied. First - low grade pyrolitic graphite, second - 10 micron film of the amorphous line- chain carbon. The film was prepared by the method of Ar ion assisted deposition of carbon plasma. The samples were irradiated by a 1.06 micro wavelength Nd laser in vacuum 0.3 Pa. The
Debonding of coatings on a substrate is currently achieved by the so-called laser spallation tech... more Debonding of coatings on a substrate is currently achieved by the so-called laser spallation technique. Here, we give an interpretation of the debonding by laser shock based on the impedance mismatch between the substrate and the coating rather than on the spallation process. An analysis in the (pressure-particle velocity) plane coupled with (space-time) diagrams provides the stress history at the
AIP Conference Proceedings, 2012
ABSTRACT Laser driven shocks allow to investigate materials behavior at very high strain rate (10... more ABSTRACT Laser driven shocks allow to investigate materials behavior at very high strain rate (10^7s-1) and presents a great interest for research applications. Microscopic simulations of ultra-short laser driven shock on micrometric Tantalum single-crystals have been performed by using the CEA-DAM Classical Molecular Dynamics code. This method, complementary to continuum models, provides an analysis the microscopic processes related to damage (ductile pore nucleation and growth) which occurs during spallation. This results are compared to spallation experiments data (VISAR signals, micro-tomography) obtained with the LULI100TW femtosecond laser in order to validate the MD behavior. Moreover, in the framework of a multi-scale approach, we show the possibility to use MD simulation to fit macroscopic damage models. This method is illustrated with an application to the parameters determination of the Kanel criterion. This also shows the high strain rates involved during damage process, around 10^9s-1, allow to approach the inter-atomic theoretical cohesion stress threshold.
AIP Conference Proceedings, 2008
When a shock-loaded target is melted on compression or on release, the tensile stresses generated... more When a shock-loaded target is melted on compression or on release, the tensile stresses generated upon reflection of the pressure pulse from a free surface are induced in a liquid state. Instead of the well-known spallation process occurring in solid targets, cavitation takes place in the melted material and liquid fragments are ejected from the free surface. Although increasing interest
Surface Engineering, 1994
Surface and Coatings Technology, 2001
This paper presents a set of laser shock debonding experiments performed using two kinds of targe... more This paper presents a set of laser shock debonding experiments performed using two kinds of targets constituted of a Ni-base substrate covered with coatings of platinum several micrometers thick. By applying laser shocks of increasing amplitude with different pulse durations between 600 ps and 3 ns, the decohesion of the coatings was observed above a threshold intensity. Depending on the