The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
M. Zenasni - One of the best experts on this subject based on the ideXlab platform.
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thermomechanical modelling of the tool workmaterial Interface in machining and its implementation using the abaqus vuinter subroutine
International Journal of Mechanical Sciences, 2014Co-Authors: Samir Atlati, Badis Haddag, Mohammed Nouari, M. ZenasniAbstract:Abstract In this paper the complex thermomechanical behaviour at the tool–workmaterial Interface in machining has been analysed. The contact behaviour is formulated in the frame of a Lagrangian Finite Element approach. The thermomechanical laws governing the tool–workmaterial Interface in machining have been implemented via the VUINTER subroutine of ABAQUS/Explicit FE code. Using this Interface, Velocity dependent heat partition coefficient of the frictional heat has been implemented. Numerical results (calculated heat flux transmitted into the tool and cutting force) have been compared to experimental ones for different cutting conditions, which are in good agreement. It is shown that different couples of the heat partition and heat transfer coefficients can give the same heat flux transmitted in the tool. In addition, with the new developed VUINTER subroutine, it is possible to implement any mathematical model governing the friction and heat exchange for simulations of complex contact behaviours.
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Thermomechanical modelling of the tool–workmaterial Interface in machining and its implementation using the \ABAQUS\ \VUINTER\ subroutine
International Journal of Mechanical Sciences, 2014Co-Authors: Samir Atlati, Badis Haddag, Mohammed Nouari, M. ZenasniAbstract:In this paper the complex thermomechanical behaviour at the tool–workmaterial Interface in machining has been analysed. The contact behaviour is formulated in the frame of a Lagrangian Finite Element approach. The thermomechanical laws governing the tool–workmaterial Interface in machining have been implemented via the \VUINTER\ subroutine of ABAQUS/Explicit \FE\ code. Using this Interface, Velocity dependent heat partition coefficient of the frictional heat has been implemented. Numerical results (calculated heat flux transmitted into the tool and cutting force) have been compared to experimental ones for different cutting conditions, which are in good agreement. It is shown that different couples of the heat partition and heat transfer coefficients can give the same heat flux transmitted in the tool. In addition, with the new developed \VUINTER\ subroutine, it is possible to implement any mathematical model governing the friction and heat exchange for simulations of complex contact behaviours.
Samir Atlati - One of the best experts on this subject based on the ideXlab platform.
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thermomechanical modelling of the tool workmaterial Interface in machining and its implementation using the abaqus vuinter subroutine
International Journal of Mechanical Sciences, 2014Co-Authors: Samir Atlati, Badis Haddag, Mohammed Nouari, M. ZenasniAbstract:Abstract In this paper the complex thermomechanical behaviour at the tool–workmaterial Interface in machining has been analysed. The contact behaviour is formulated in the frame of a Lagrangian Finite Element approach. The thermomechanical laws governing the tool–workmaterial Interface in machining have been implemented via the VUINTER subroutine of ABAQUS/Explicit FE code. Using this Interface, Velocity dependent heat partition coefficient of the frictional heat has been implemented. Numerical results (calculated heat flux transmitted into the tool and cutting force) have been compared to experimental ones for different cutting conditions, which are in good agreement. It is shown that different couples of the heat partition and heat transfer coefficients can give the same heat flux transmitted in the tool. In addition, with the new developed VUINTER subroutine, it is possible to implement any mathematical model governing the friction and heat exchange for simulations of complex contact behaviours.
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Thermomechanical modelling of the tool–workmaterial Interface in machining and its implementation using the \ABAQUS\ \VUINTER\ subroutine
International Journal of Mechanical Sciences, 2014Co-Authors: Samir Atlati, Badis Haddag, Mohammed Nouari, M. ZenasniAbstract:In this paper the complex thermomechanical behaviour at the tool–workmaterial Interface in machining has been analysed. The contact behaviour is formulated in the frame of a Lagrangian Finite Element approach. The thermomechanical laws governing the tool–workmaterial Interface in machining have been implemented via the \VUINTER\ subroutine of ABAQUS/Explicit \FE\ code. Using this Interface, Velocity dependent heat partition coefficient of the frictional heat has been implemented. Numerical results (calculated heat flux transmitted into the tool and cutting force) have been compared to experimental ones for different cutting conditions, which are in good agreement. It is shown that different couples of the heat partition and heat transfer coefficients can give the same heat flux transmitted in the tool. In addition, with the new developed \VUINTER\ subroutine, it is possible to implement any mathematical model governing the friction and heat exchange for simulations of complex contact behaviours.
Julius M. Gardin - One of the best experts on this subject based on the ideXlab platform.
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Calculation of volume flow rate by the proximal isoVelocity surface area method: Simplified approach using color Doppler zero baseline shift
Journal of the American College of Cardiology, 1993Co-Authors: Toshinori Utsunomiya, Rajen Doshi, Dharmendra Patel, Walter L. Henry, Dat Nguyen, Kapil Mehta, Julius M. GardinAbstract:Objectives. The goal of this study was to develop an accurate, simplified proximal isoVelocity surface area (PISA) method for calculating volume flow rate using lower blue-red Interface Velocity produced by a color Doppler zero baseline shift technique. Background. The Doppler color proximal isoVelocity surface area method has been shown to be accurate for calculating the volume flow rate (Q) across a narrowed orifice by the formula Q = PISA × Blue-red Interface Velocity. A hemispheric model is generally used to calculate proximal isoVelocity surface area (PISA = 2πa2, where a = the radius corresponding to the blue-red Interface Velocity). Although a hemispheric model is simple, requiring measurement of one radius, it may underestimate the actual volume flow rate because, in the general case, the shape of a proximal isoVelocity surface area is hemielliptic. Although a hemielliptic model is generally more accurate for calculating proximal isoVelocity surface area, it is more complex, requiring measurement of two orthogonal radii. Methods. Sixteen in vitro constant flow model studies were performed using planar circular orifices (diameter range 6 to 16 mm). The blue-red Interface Velocity was changed from 3 to 54 cm/s using color Doppler zero baseline shift. Results. 1) With decreasing blue-red Interface Velocity, the size of the proximal isoVelocity surface area was increased, and its shape changed from hemielliptic to hemispheric. 2) With the blue-red Interface Velocity in the range 11 to 15 cm/s, the proximal isoVelocity surface area became nearly hemispheric; however, it was difficult to determine the blue-red Interface radius at a blue-red Interface Velocity
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calculation of volume flow rate by the proximal isoVelocity surface area method simplified approach using color doppler zero baseline shift
Journal of the American College of Cardiology, 1993Co-Authors: Toshinori Utsunomiya, Rajen Doshi, Dharmendra Patel, Walter L. Henry, Dat Nguyen, Kapil Mehta, Julius M. GardinAbstract:Objectives. The goal of this study was to develop an accurate, simplified proximal isoVelocity surface area (PISA) method for calculating volume flow rate using lower blue-red Interface Velocity produced by a color Doppler zero baseline shift technique. Background. The Doppler color proximal isoVelocity surface area method has been shown to be accurate for calculating the volume flow rate (Q) across a narrowed orifice by the formula Q = PISA × Blue-red Interface Velocity. A hemispheric model is generally used to calculate proximal isoVelocity surface area (PISA = 2πa2, where a = the radius corresponding to the blue-red Interface Velocity). Although a hemispheric model is simple, requiring measurement of one radius, it may underestimate the actual volume flow rate because, in the general case, the shape of a proximal isoVelocity surface area is hemielliptic. Although a hemielliptic model is generally more accurate for calculating proximal isoVelocity surface area, it is more complex, requiring measurement of two orthogonal radii. Methods. Sixteen in vitro constant flow model studies were performed using planar circular orifices (diameter range 6 to 16 mm). The blue-red Interface Velocity was changed from 3 to 54 cm/s using color Doppler zero baseline shift. Results. 1) With decreasing blue-red Interface Velocity, the size of the proximal isoVelocity surface area was increased, and its shape changed from hemielliptic to hemispheric. 2) With the blue-red Interface Velocity in the range 11 to 15 cm/s, the proximal isoVelocity surface area became nearly hemispheric; however, it was difficult to determine the blue-red Interface radius at a blue-red Interface Velocity <10 cm/s because of Interface fluctuations. 3) Calculated volume flow rate using the hemispheric proximal isoVelocity surface area model with a single radius was relatively accurate at a blue-red Interface Velocity of 11 to 15 cm/s (mean percent difference from actual volume flow rate was −3.6%). Conclusions. Because the shape of the proximal isoVelocity surface area is nearly hemispheric at a blue-red Interface Velocity of 11 to 15 cm/s, volume flow rate can be accurately calculated in this proximal isoVelocity surface area Interface Velocity range (produced by zero baseline shift) by measuring a single-Interface radius. This approach should be clinically useful for calculating the volume flow rate across stenotic and regurgitant valves and across shunt defects.
Marcus D Knudson - One of the best experts on this subject based on the ideXlab platform.
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lagrangian technique to calculate window Interface Velocity from shock Velocity measurements application for quartz windows
Journal of Applied Physics, 2017Co-Authors: C A Mccoy, Marcus D KnudsonAbstract:Measurement of the window Interface Velocity is a common technique for investigating the dynamic response materials at high strain rates. However, these measurements are limited in pressure to the range where the window remains transparent. The most common window material for this application is lithium fluoride, which under single shock compression becomes opaque at ∼200 GPa. To date, no other window material has been identified for use at higher pressures. Here, we present a Lagrangian technique to calculate the Interface Velocity from a continuously measured shock Velocity, with application to quartz. The quartz shock front becomes reflective upon melt, at ∼100 GPa, enabling the use of Velocity interferometry to continuously measure the shock Velocity. This technique overlaps with the range of pressures accessible with LiF windows and extends the region where wave profile measurements are possible to pressures in excess of 2000 GPa. We show through simulated data that the technique accurately reproduce...
Badis Haddag - One of the best experts on this subject based on the ideXlab platform.
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thermomechanical modelling of the tool workmaterial Interface in machining and its implementation using the abaqus vuinter subroutine
International Journal of Mechanical Sciences, 2014Co-Authors: Samir Atlati, Badis Haddag, Mohammed Nouari, M. ZenasniAbstract:Abstract In this paper the complex thermomechanical behaviour at the tool–workmaterial Interface in machining has been analysed. The contact behaviour is formulated in the frame of a Lagrangian Finite Element approach. The thermomechanical laws governing the tool–workmaterial Interface in machining have been implemented via the VUINTER subroutine of ABAQUS/Explicit FE code. Using this Interface, Velocity dependent heat partition coefficient of the frictional heat has been implemented. Numerical results (calculated heat flux transmitted into the tool and cutting force) have been compared to experimental ones for different cutting conditions, which are in good agreement. It is shown that different couples of the heat partition and heat transfer coefficients can give the same heat flux transmitted in the tool. In addition, with the new developed VUINTER subroutine, it is possible to implement any mathematical model governing the friction and heat exchange for simulations of complex contact behaviours.
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Thermomechanical modelling of the tool–workmaterial Interface in machining and its implementation using the \ABAQUS\ \VUINTER\ subroutine
International Journal of Mechanical Sciences, 2014Co-Authors: Samir Atlati, Badis Haddag, Mohammed Nouari, M. ZenasniAbstract:In this paper the complex thermomechanical behaviour at the tool–workmaterial Interface in machining has been analysed. The contact behaviour is formulated in the frame of a Lagrangian Finite Element approach. The thermomechanical laws governing the tool–workmaterial Interface in machining have been implemented via the \VUINTER\ subroutine of ABAQUS/Explicit \FE\ code. Using this Interface, Velocity dependent heat partition coefficient of the frictional heat has been implemented. Numerical results (calculated heat flux transmitted into the tool and cutting force) have been compared to experimental ones for different cutting conditions, which are in good agreement. It is shown that different couples of the heat partition and heat transfer coefficients can give the same heat flux transmitted in the tool. In addition, with the new developed \VUINTER\ subroutine, it is possible to implement any mathematical model governing the friction and heat exchange for simulations of complex contact behaviours.