The Experts below are selected from a list of 228 Experts worldwide ranked by ideXlab platform
Yusuf Altintas - One of the best experts on this subject based on the ideXlab platform.
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Prediction of micro-milling forces with finite element method
Journal of Materials Processing Technology, 2012Co-Authors: Xiaoliang Jin, Yusuf AltintasAbstract:This paper presents the prediction of micro-milling forces using cutting force coefficients evaluated from the finite element (FE) simulations. First an FE model of orthogonal micro-cutting with a round cutting edge is developed for Brass 260. The simulated cutting forces are compared against the experimental results obtained from turning tests. The cutting force coefficients are identified from a series of FE simulations at a range of cutting edge radii and chip loads. The identified cutting force coefficients are used to simulate micro-milling forces considering the tool trajectory, run-out and the dynamometer dynamics. The same process is also simulated with a Slip-Line Field based model. FE and Slip-Line Field based simulation results are compared against the experimentally measured turning and micro-milling forces. © 2011 Elsevier B.V. All rights reserved.
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Slip Line Field model of micro cutting process with round tool edge effect
Journal of Materials Processing Technology, 2011Co-Authors: Yusuf AltintasAbstract:This paper presents a Slip-Line Field model which considers the stress variation in the material deformation region due to the tool edge radius effect. The Johnson–Cook constitutive model is applied to obtain the shear flow stress and hydrostatic pressure as functions of strain, strain-rate, and temperature in the primary shear zone. The friction parameters between the rake face and chip are identified from cutting tests. The sticking and sliding contact zones between the tool and chip are considered in the secondary shear zone. The total cutting forces are evaluated by integrating the forces along the entire chip-rake face contact zone and the ploughing force caused by the round edge. The proposed model is experimentally verified by a series of cutting force measurements conducted during micro-turning tests. Micro-cutting process is analyzed from a series of Slip-Line Field simulations.
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Slip-Line Field model of micro-cutting process with round tool edge effect
Journal of Materials Processing Technology, 2011Co-Authors: Xiaoliang Jin, Yusuf AltintasAbstract:This paper presents a Slip-Line Field model which considers the stress variation in the material deformation region due to the tool edge radius effect. The Johnson-Cook constitutive model is applied to obtain the shear flow stress and hydrostatic pressure as functions of strain, strain-rate, and temperature in the primary shear zone. The friction parameters between the rake face and chip are identified from cutting tests. The sticking and sliding contact zones between the tool and chip are considered in the secondary shear zone. The total cutting forces are evaluated by integrating the forces along the entire chip-rake face contact zone and the ploughing force caused by the round edge. The proposed model is experimentally verified by a series of cutting force measurements conducted during micro-turning tests. Micro-cutting process is analyzed from a series of Slip-Line Field simulations. © 2010 Elsevier B.V. All rights reserved.
E. Niemi - One of the best experts on this subject based on the ideXlab platform.
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Analysis of the stress concentration factor for a shallow notch by the Slip-Line Field method
International Journal of Fatigue, 1997Co-Authors: M. Zheng, E. NiemiAbstract:The relationships correlating the local stress and strain at the tip of a notch, the nominal stress expressed by the so called Neuber's rule and Moski and Glinka's equivalent energy density method are studied for a shallow notch,using the Slip-Line Field method proposed in plastic mechanics, and an elastic-plastic solution for the area close to the notch. An elastic-perfect plastic material model is also used. It is found that for lower stress amplitude Moski and Glinka's method is with a good accuracy; however, the relative deviations of the actual stress concentration factors calculated by these two methods to the theoretical stress concentration factor are not small, even up to 20% for higher stress amplitude as the size of the plastic zone around the notch approaches the value of the radius of the notch curvature. While the geometric mean of the two expressions mentioned above can be considered as a reasonable expression to correlate the local stress-strain and the nominal stress, and thus the corresponding actual equivalent stress concentration factor can be evaluated, of which the relative deviations to the theoretical stress concentration factor is shown to be
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analysis of the stress concentration factor for a shallow notch by the Slip Line Field method
International Journal of Fatigue, 1997Co-Authors: M. Zheng, E. NiemiAbstract:The relationships correlating the local stress and strain at the tip of a notch, the nominal stress expressed by the so called Neuber's rule and Moski and Glinka's equivalent energy density method are studied for a shallow notch,using the Slip-Line Field method proposed in plastic mechanics, and an elastic-plastic solution for the area close to the notch. An elastic-perfect plastic material model is also used. It is found that for lower stress amplitude Moski and Glinka's method is with a good accuracy; however, the relative deviations of the actual stress concentration factors calculated by these two methods to the theoretical stress concentration factor are not small, even up to 20% for higher stress amplitude as the size of the plastic zone around the notch approaches the value of the radius of the notch curvature. While the geometric mean of the two expressions mentioned above can be considered as a reasonable expression to correlate the local stress-strain and the nominal stress, and thus the corresponding actual equivalent stress concentration factor can be evaluated, of which the relative deviations to the theoretical stress concentration factor is shown to be <5%, if the size of plastic zone close to the notch is not greater than the value of the radius of curvature of the notch.
M. Zheng - One of the best experts on this subject based on the ideXlab platform.
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Analysis of the stress concentration factor for a shallow notch by the Slip-Line Field method
International Journal of Fatigue, 1997Co-Authors: M. Zheng, E. NiemiAbstract:The relationships correlating the local stress and strain at the tip of a notch, the nominal stress expressed by the so called Neuber's rule and Moski and Glinka's equivalent energy density method are studied for a shallow notch,using the Slip-Line Field method proposed in plastic mechanics, and an elastic-plastic solution for the area close to the notch. An elastic-perfect plastic material model is also used. It is found that for lower stress amplitude Moski and Glinka's method is with a good accuracy; however, the relative deviations of the actual stress concentration factors calculated by these two methods to the theoretical stress concentration factor are not small, even up to 20% for higher stress amplitude as the size of the plastic zone around the notch approaches the value of the radius of the notch curvature. While the geometric mean of the two expressions mentioned above can be considered as a reasonable expression to correlate the local stress-strain and the nominal stress, and thus the corresponding actual equivalent stress concentration factor can be evaluated, of which the relative deviations to the theoretical stress concentration factor is shown to be
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analysis of the stress concentration factor for a shallow notch by the Slip Line Field method
International Journal of Fatigue, 1997Co-Authors: M. Zheng, E. NiemiAbstract:The relationships correlating the local stress and strain at the tip of a notch, the nominal stress expressed by the so called Neuber's rule and Moski and Glinka's equivalent energy density method are studied for a shallow notch,using the Slip-Line Field method proposed in plastic mechanics, and an elastic-plastic solution for the area close to the notch. An elastic-perfect plastic material model is also used. It is found that for lower stress amplitude Moski and Glinka's method is with a good accuracy; however, the relative deviations of the actual stress concentration factors calculated by these two methods to the theoretical stress concentration factor are not small, even up to 20% for higher stress amplitude as the size of the plastic zone around the notch approaches the value of the radius of the notch curvature. While the geometric mean of the two expressions mentioned above can be considered as a reasonable expression to correlate the local stress-strain and the nominal stress, and thus the corresponding actual equivalent stress concentration factor can be evaluated, of which the relative deviations to the theoretical stress concentration factor is shown to be <5%, if the size of plastic zone close to the notch is not greater than the value of the radius of curvature of the notch.
Xiaoliang Jin - One of the best experts on this subject based on the ideXlab platform.
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Prediction of micro-milling forces with finite element method
Journal of Materials Processing Technology, 2012Co-Authors: Xiaoliang Jin, Yusuf AltintasAbstract:This paper presents the prediction of micro-milling forces using cutting force coefficients evaluated from the finite element (FE) simulations. First an FE model of orthogonal micro-cutting with a round cutting edge is developed for Brass 260. The simulated cutting forces are compared against the experimental results obtained from turning tests. The cutting force coefficients are identified from a series of FE simulations at a range of cutting edge radii and chip loads. The identified cutting force coefficients are used to simulate micro-milling forces considering the tool trajectory, run-out and the dynamometer dynamics. The same process is also simulated with a Slip-Line Field based model. FE and Slip-Line Field based simulation results are compared against the experimentally measured turning and micro-milling forces. © 2011 Elsevier B.V. All rights reserved.
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Slip-Line Field model of micro-cutting process with round tool edge effect
Journal of Materials Processing Technology, 2011Co-Authors: Xiaoliang Jin, Yusuf AltintasAbstract:This paper presents a Slip-Line Field model which considers the stress variation in the material deformation region due to the tool edge radius effect. The Johnson-Cook constitutive model is applied to obtain the shear flow stress and hydrostatic pressure as functions of strain, strain-rate, and temperature in the primary shear zone. The friction parameters between the rake face and chip are identified from cutting tests. The sticking and sliding contact zones between the tool and chip are considered in the secondary shear zone. The total cutting forces are evaluated by integrating the forces along the entire chip-rake face contact zone and the ploughing force caused by the round edge. The proposed model is experimentally verified by a series of cutting force measurements conducted during micro-turning tests. Micro-cutting process is analyzed from a series of Slip-Line Field simulations. © 2010 Elsevier B.V. All rights reserved.
C K Biswas - One of the best experts on this subject based on the ideXlab platform.
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an analysis of strain in chip breaking using Slip Line Field theory with adhesion friction at chip tool interface
Journal of Materials Processing Technology, 2005Co-Authors: B S Chawla, C K BiswasAbstract:Abstract A Slip-Line Field model for orthogonal cutting with step-type chip breaker assuming adhesion friction at chip/tool interface is developed using Kudo's basic Slip-Line Field. An alternative method is suggested for estimation of breaking strain in the chip. The model proposed predicts that with decrease in distance of chip breaker from the cutting edge of the tool, the breaking strain and shear strain in the secondary deformation zone increase while the total plastic strain decreases. The breaking of the chip is found to be solely dependent on the breaking strain, and not on ‘material damage’ or the specific cutting energy. The chip radius of curvature, cutting ratio, range of position of chip breaker for effective chip breaking are computed. The calculated results are found to be in general agreement with experimental measurements.
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An analysis of strain in chip breaking using Slip-Line Field theory with adhesion friction at chip/tool interface
Journal of Materials Processing Technology, 2005Co-Authors: B S Chawla, C K BiswasAbstract:Abstract A Slip-Line Field model for orthogonal cutting with step-type chip breaker assuming adhesion friction at chip/tool interface is developed using Kudo's basic Slip-Line Field. An alternative method is suggested for estimation of breaking strain in the chip. The model proposed predicts that with decrease in distance of chip breaker from the cutting edge of the tool, the breaking strain and shear strain in the secondary deformation zone increase while the total plastic strain decreases. The breaking of the chip is found to be solely dependent on the breaking strain, and not on ‘material damage’ or the specific cutting energy. The chip radius of curvature, cutting ratio, range of position of chip breaker for effective chip breaking are computed. The calculated results are found to be in general agreement with experimental measurements.
