The Experts below are selected from a list of 125034 Experts worldwide ranked by ideXlab platform
Michal Kuciej - One of the best experts on this subject based on the ideXlab platform.
-
The Thermal Problem of Friction for Two Plane-Parallel Strips
Numerical Heat Transfer Part A: Applications, 2012Co-Authors: Aleksander Yevtushenko, Michal KuciejAbstract:The analytical solution is obtained to a Thermal Problem of friction for a tribosystem consisting of two plane-parallel strips. It is assumed that the relative sliding speed is constant, and the Thermal contact between the strips is imperfect. The possibility of using the obtained solution to the study of temperature during braking was shown. The evolution of the contact temperature and its spatial distribution in materials of frictional pair such as metal-ceramic—cast iron was investigated.
-
The Thermal Problem of friction for a three-element tribosystem with composite strip
International Journal of Heat and Mass Transfer, 2011Co-Authors: Aleksander Yevtushenko, Michal KuciejAbstract:Abstract The distribution of a non-stationary temperature field in a three-element tribosystem has been studied. It is assumed that the heat is generated by friction during uniform sliding on the surface of contact of the homogeneous top semi-space and a composite strip deposited on a semi-infinite foundation. The Thermal contact of a top semi-space and a composite strip is imperfect, i.e. the jump of the temperatures takes place on the contact surface. The analytical solution of a Thermal Problem of friction for such a tribosytem has been found by means of Laplace integral transform method. The influence of the geometrical sizes of components of a composite and their physical properties on temperature in tribosystem has been investigated.
-
The Thermal Problem of friction during braking for a three-element tribosystem with a composite pad
International Communications in Heat and Mass Transfer, 2011Co-Authors: Michal KuciejAbstract:Abstract The analytical solution to a Thermal Problem of friction during braking with constant retardation for a three-element system (a foundation/strip/semi-space) is obtained. The solution allows to find the evolution and distribution of transient temperature in the caliper/pad/disk tribosystem. Unlike known solutions for three-element tribosystem, this one is obtained on the assumption that material of the pad (strip) is the periodic composite. The every unit cell of the composite contains four sub-cells with rectangular cross-section and with different thermo-physical properties. It is assumed, that intensity of the heat generation on the contact surface is equal to power of friction and through this surface the heat transfer takes place. The influence of the geometrical dimensions and thermo-physical properties of composite sub-cells on the maximum temperature in the system has been investigated.
-
Thermal Problem of friction when the plane-parallel layer-base tribosystem brakes
Journal of Friction and Wear, 2010Co-Authors: Aleksander Yevtushenko, Michal KuciejAbstract:The boundary Problem of heat conductivity in the plane-parallel layer and semi-infinite base tribosystem is solved analytically. The layer slides over the base surface with speed that recedes linearly in time. The Thermal contact is nonfull and the bodies exchange heat with the environment by convection. The effect of the heat exchange and Thermal conductivity factors on the temperature distribution in the cermet layer-cast-iron base tribocouple is analyzed.
A Molinari - One of the best experts on this subject based on the ideXlab platform.
-
a new friction law for sticking and sliding contacts in machining
Tribology International, 2011Co-Authors: Slim Bahi, Abdelhadi Moufki, Mohammed Nouari, El M Mansori, A MolinariAbstract:Abstract In this paper, a thermomechanical modelling of the material flow is developed, and the tool–chip contact length and the sliding–sticking zones are characterised analytically. Furthermore, the finite element method is used to solve the non-linear Thermal Problem in the chip. The effect of cutting conditions and material behaviour on the sliding–sticking zones and on the temperature distribution and local friction along the tool–chip interface is evaluated. It has been found that the sliding–sticking zones strongly control the local conditions of stress, velocity and temperature. A qualitative comparison between the proposed model and experimental results is provided.
Mohammed Nouari - One of the best experts on this subject based on the ideXlab platform.
-
A thermomechanical analysis of sticking-sliding zones at the tool-chip interface in dry high-speed machining of aluminium alloy A2024–T351: A hybrid Analytical-Fe model
2017Co-Authors: Mohammed Nouari, Abdelhadi Moufki, Yao Venunye AvevorAbstract:In high speed dry machining of aluminium alloy (A2024-T351), the tribological conditions at the tool-chip interface strongly affect the thermomechanical process of chip formation, the tool wear and the surface integrity. In order to contribute to the understanding of the effect of friction conditions, a hybrid Analytical-FE model is presented. The transient nonlinear Thermal Problem in the tool-chip-workpiece system is solved by using a Petrov-Galerkin finite element model. To illustrate the model results, the relationship between the local friction coefficient, in the sliding zone, and the apparent friction coefficient, which takes into account the whole tool-chip contact, is presented.
-
A thermomechanical analysis of sticking-sliding zones at the tool-chip interface in dry high-speed machining of aluminium alloy A2024–T351: A hybrid Analytical-Fe model
2017Co-Authors: Mohammed Nouari, Abdelhadi Moufki, Yao Venunye AvevorAbstract:In high speed dry machining of aluminium alloy (A2024-T351), the tribological conditions at the tool-chip interface strongly affect the thermomechanical process of chip formation, the tool wear and the surface integrity. In order to contribute to the understanding of the effect of friction conditions, a hybrid Analytical-FE model is presented. The transient nonlinear Thermal Problem in the tool-chip-workpiece system is solved by using a Petrov-Galerkin finite element model. To illustrate the model results, the relationship between the local friction coefficient, in the sliding zone, and the apparent friction coefficient, which takes into account the whole tool-chip contact, is presented.
-
a new friction law for sticking and sliding contacts in machining
Tribology International, 2011Co-Authors: Slim Bahi, Abdelhadi Moufki, Mohammed Nouari, El M Mansori, A MolinariAbstract:Abstract In this paper, a thermomechanical modelling of the material flow is developed, and the tool–chip contact length and the sliding–sticking zones are characterised analytically. Furthermore, the finite element method is used to solve the non-linear Thermal Problem in the chip. The effect of cutting conditions and material behaviour on the sliding–sticking zones and on the temperature distribution and local friction along the tool–chip interface is evaluated. It has been found that the sliding–sticking zones strongly control the local conditions of stress, velocity and temperature. A qualitative comparison between the proposed model and experimental results is provided.
Abdelhadi Moufki - One of the best experts on this subject based on the ideXlab platform.
-
A thermomechanical analysis of sticking-sliding zones at the tool-chip interface in dry high-speed machining of aluminium alloy A2024–T351: A hybrid Analytical-Fe model
2017Co-Authors: Mohammed Nouari, Abdelhadi Moufki, Yao Venunye AvevorAbstract:In high speed dry machining of aluminium alloy (A2024-T351), the tribological conditions at the tool-chip interface strongly affect the thermomechanical process of chip formation, the tool wear and the surface integrity. In order to contribute to the understanding of the effect of friction conditions, a hybrid Analytical-FE model is presented. The transient nonlinear Thermal Problem in the tool-chip-workpiece system is solved by using a Petrov-Galerkin finite element model. To illustrate the model results, the relationship between the local friction coefficient, in the sliding zone, and the apparent friction coefficient, which takes into account the whole tool-chip contact, is presented.
-
A thermomechanical analysis of sticking-sliding zones at the tool-chip interface in dry high-speed machining of aluminium alloy A2024–T351: A hybrid Analytical-Fe model
2017Co-Authors: Mohammed Nouari, Abdelhadi Moufki, Yao Venunye AvevorAbstract:In high speed dry machining of aluminium alloy (A2024-T351), the tribological conditions at the tool-chip interface strongly affect the thermomechanical process of chip formation, the tool wear and the surface integrity. In order to contribute to the understanding of the effect of friction conditions, a hybrid Analytical-FE model is presented. The transient nonlinear Thermal Problem in the tool-chip-workpiece system is solved by using a Petrov-Galerkin finite element model. To illustrate the model results, the relationship between the local friction coefficient, in the sliding zone, and the apparent friction coefficient, which takes into account the whole tool-chip contact, is presented.
-
a new friction law for sticking and sliding contacts in machining
Tribology International, 2011Co-Authors: Slim Bahi, Abdelhadi Moufki, Mohammed Nouari, El M Mansori, A MolinariAbstract:Abstract In this paper, a thermomechanical modelling of the material flow is developed, and the tool–chip contact length and the sliding–sticking zones are characterised analytically. Furthermore, the finite element method is used to solve the non-linear Thermal Problem in the chip. The effect of cutting conditions and material behaviour on the sliding–sticking zones and on the temperature distribution and local friction along the tool–chip interface is evaluated. It has been found that the sliding–sticking zones strongly control the local conditions of stress, velocity and temperature. A qualitative comparison between the proposed model and experimental results is provided.
Mark D. Brandyberry - One of the best experts on this subject based on the ideXlab platform.
-
Thermal Problem solution using a surrogate model clustering technique
Computer Methods in Applied Mechanics and Engineering, 2007Co-Authors: Mark D. BrandyberryAbstract:The Thermal Problem defined for the validation challenge workshop involves a simple one-dimensional slab geometry with a defined heat flux at the front face, adiabatic conditions at the rear face, and a provided baseline predictive simulation model to be used to simulate the time-dependent heatup of the slab. This paper will discuss a clustering methodology using a surrogate heat transfer algorithm that allows propagation of the uncertainties in the model parameters using a very limited series of full simulations. This clustering methodology can be used when the predictive model to be run is very expensive, and only a few simulation runs are possible. A series of time-dependent statistical comparisons designed to validate the model against experimental data provided in the Problem formulation will also be presented, and limitations of the approach discussed. The purpose of this paper is to represent methods of propagation of uncertainty with limited computer runs, validation with uncertain data, and decision-making under uncertainty. The final results of the analysis indicate that the there is approximately 95% confidence that the regulatory criteria under consideration would be failed given the high level of physical data provided.
