The Experts below are selected from a list of 108276 Experts worldwide ranked by ideXlab platform
W J Zong - One of the best experts on this subject based on the ideXlab platform.
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tool rake angle selection in micro machining of 45 vol sicp 2024al based on its brittle Plastic Properties
Journal of Manufacturing Processes, 2019Co-Authors: Sujuan Wang, W J ZongAbstract:Abstract The influence of brittle and Plastic Properties of 45% volume fraction silicon carbide particle reinforced aluminum matrix composites (45 vol.% SiCp/2024Al) on machining are first taken into account in this work. Considering the coexistence of brittle and Plastic Properties, a novel micro-machining process is specially proposed for this material to suppress the shedding of SiC particles with a polycrystalline diamond tool, which requires a suitable negative rake angle. As expected, the unwanted materials accumulate ahead of tool cutting edge to form the chips and are finally removed under the compressive stress. In this case, the SiC particles are frequently pressed into the machined surface, so the number of shedding particles reduces considerably. As a result, the finished surface roughness is improved, and the tool wear is also suppressed effectively. However, a larger negative rake angle induces an excessive cutting force but decreases the stability of machine system, which in return speeds up tool wear and produces a higher surface roughness Sa. Turning experiments show that the smallest surface roughness Sa is achieved when tool rake angle is −30°. Moreover, the wear volume of the −30° rake angle tool is only 1/22 times the 0° rake angle tool.
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Tool rake angle selection in micro-machining of 45 vol.%SiCp/2024Al based on its brittle-Plastic Properties
Journal of Manufacturing Processes, 2018Co-Authors: S J Wang, W J ZongAbstract:Abstract The influence of brittle and Plastic Properties of 45% volume fraction silicon carbide particle reinforced aluminum matrix composites (45 vol.% SiCp/2024Al) on machining are first taken into account in this work. Considering the coexistence of brittle and Plastic Properties, a novel micro-machining process is specially proposed for this material to suppress the shedding of SiC particles with a polycrystalline diamond tool, which requires a suitable negative rake angle. As expected, the unwanted materials accumulate ahead of tool cutting edge to form the chips and are finally removed under the compressive stress. In this case, the SiC particles are frequently pressed into the machined surface, so the number of shedding particles reduces considerably. As a result, the finished surface roughness is improved, and the tool wear is also suppressed effectively. However, a larger negative rake angle induces an excessive cutting force but decreases the stability of machine system, which in return speeds up tool wear and produces a higher surface roughness Sa. Turning experiments show that the smallest surface roughness Sa is achieved when tool rake angle is −30°. Moreover, the wear volume of the −30° rake angle tool is only 1/22 times the 0° rake angle tool.
T A Venkatesh - One of the best experts on this subject based on the ideXlab platform.
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Determination of the Elastic and Plastic Properties of Transversely Isotropic Thin Films on Substrates by Sharp Indentation
MRS Advances, 2018Co-Authors: Zheng Zhi, T A VenkateshAbstract:ABSTRACTA combination of dimensional analysis and finite element modeling was invoked to characterize the indentation behavior of transversely isotropic thin films on substrate materials. Through indentation simulations of over 13,500 combinations of Properties for the thin film system, functional relationships that connect the indentation responses of the thin films with the elastic and Plastic Properties of the thin films were obtained. The forward algorithms that predict the indentation response characteristics from known material Properties and the reverse algorithms that predict the material Properties from known indentation responses were verified to be very accurate. Thus, the viability of using the indentation method to determine the elastic and Plastic Properties of transversely isotropic thin films on substrate materials was demonstrated.
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On the relationships between hardness and the elastic and Plastic Properties of isotropic power-law hardening materials
Philosophical Magazine, 2013Co-Authors: Hongzhi Lan, T A VenkateshAbstract:A comprehensive understanding of the relationship between the hardness and the elastic and Plastic Properties for a wide range of materials is obtained by analysing the hardness characteristics (that are predicted by experimentally verified indentation analyses) of over 9000 distinct combinations of material Properties that represent isotropic, homogeneous, power-law hardening metallic materials. Finite element analysis has been used to develop the indentation algorithms that provide the relationships between the elastic and Plastic Properties of the indented material and its indentation hardness. Based on computational analysis and virtual testing, the following observations are made. The hardness (H) of a material tends to increase with an increase in the elastic modulus (E), yield strength (σy) and the strain-hardening exponent (n). Several materials with different combinations of elastic and Plastic Properties can exhibit identical true hardness (for a particular indenter geometry/apex angle). In gene...
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On the uniqueness and sensitivity issues in determining the elastic and Plastic Properties of power-law hardening materials through sharp and spherical indentation
Philosophical Magazine, 2007Co-Authors: Hongzhi Lan, T A VenkateshAbstract:A systematic study of the uniqueness, reversibility and sensitivity issues associated with seven indentation-based methods of property extraction demonstrates that: (i) The indentation algorithms generally identify the elastic and Plastic Properties of materials uniquely for most materials. (ii) The indentation forward algorithms (wherein the indention responses are determined from the elastic and Plastic Properties of the indented materials) and the reverse algorithms (wherein the elastic and the Plastic Properties of materials are extracted from the indentation responses) are distinct for each indentation method and are internally consistent in that the differences in the elastic and Plastic Properties determined through the reverse analysis and the ‘true’ material Properties are generally small for a large number of materials, for each of the seven methods. (iii) While the differences in the indentation response parameters predicted by each of the seven indentation methods (for a particular material) c...
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Determination of the elastic and Plastic Properties of materials through instrumented indentation with reduced sensitivity
Acta Materialia, 2007Co-Authors: Hongzhi Lan, T A VenkateshAbstract:By considering the complete loading and unloading response characteristics of multiple sharp indentations with differing indenter apex angles, a new approach has been developed to extract the elastic and Plastic Properties of materials. Considerable reduction in the sensitivity characteristics of all the indentation parameters invoked in the reverse analysis for the identification of the elastic and Plastic Properties of the indented material is realized. The reduction in sensitivity obtained using the present approach is attributed to an optimization process that identifies the material Properties that best describe all the available information from multiple indentations. A comprehensive comparison of several multiple indentation methods for a large number of material combinations illustrates that the triple indentation method that does not utilize representative stresses and the quadruple indentation method that invokes representative stresses provide the least sensitivity in the determination of elastic and Plastic Properties.
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On the sensitivity characteristics in the determination of the elastic and Plastic Properties of materials through multiple indentation
Journal of Materials Research, 2007Co-Authors: Hongzhi Lan, T A VenkateshAbstract:A comprehensive study of the sensitivity characteristics associated with the determination of the elasto-Plastic Properties of a large number of materials using several combinations of dual, triple, and quadruple sharp indentation, and spherical indentation illustrates that: (i) The lowest sensitivity to the determination of Plastic Properties is observed for the indenter combination that corresponds either to the largest difference in the corresponding representative stresses or the largest difference in the indenter apex angles. (ii) The triple or quadruple sharp indenter combinations considered in the present study do not show a significant improvement in the sensitivity characteristics when compared to that of the dual sharp indentation. (iii) In the determination of Plastic Properties through spherical indentation where two representative stresses are invoked, the highest and the lowest sensitivity, respectively, are observed for the combinations in which the differences in the representative stresses are the lowest and the highest. The sensitivity is further reduced if a large number of representative stresses are considered for the reverse analysis.
V. Lepingle - One of the best experts on this subject based on the ideXlab platform.
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Influence of visco-elasto-Plastic Properties of magnetite on the elastic modulus: Multicyclic indentation and theoretical studies
Materials Chemistry and Physics, 2010Co-Authors: D. Chicot, F. Roudet, A. Zaoui, G. Louis, V. LepingleAbstract:International audienceIn the present work, we study the indentation behaviour of the magnetite coexisting with hematite in a natural dual-phase crystal. In particular we show the influence of cycling indentation conditions on the elastic modulus measurement in relation to the visco-elasto-Plastic Properties of the material. Elastic Properties of Fe3O4 are investigated using Oliver and Pharr's technique, which is based on depth-sensing indentation (DSI) analysis. Depending on the visco-elasto-Plastic Properties of the material, the indentation test conditions (monotonic, cyclic, loading and unloading rates, dwell time at peak load, ...) can modify the shape of the load–depth curve and, subsequently, the results. Molecular dynamics simulation based on shell model potential, is used to determine elastic quantities including elastic modulus, bulk modulus and Young modulus
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Influence of visco-elasto-Plastic Properties of magnetite on the elastic modulus: Multicyclic indentation and theoretical studies
Materials Chemistry and Physics, 2009Co-Authors: D. Chicot, F. Roudet, A. Zaoui, G. Louis, V. LepingleAbstract:Abstract In the present work, we study the indentation behaviour of the magnetite coexisting with hematite in a natural dual-phase crystal. In particular we show the influence of cycling indentation conditions on the elastic modulus measurement in relation to the visco-elasto-Plastic Properties of the material. Elastic Properties of Fe3O4 are investigated using Oliver and Pharr's technique, which is based on depth-sensing indentation (DSI) analysis. Depending on the visco-elasto-Plastic Properties of the material, the indentation test conditions (monotonic, cyclic, loading and unloading rates, dwell time at peak load, …) can modify the shape of the load–depth curve and, subsequently, the results. Molecular dynamics simulation based on shell model potential, is used to determine elastic quantities including elastic modulus, bulk modulus and Young modulus.
Xi Chen - One of the best experts on this subject based on the ideXlab platform.
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Limit analysis-based approach to determine the material Plastic Properties with conical indentation
Journal of Materials Research, 2006Co-Authors: Nagahisa Ogasawara, Norimasa Chiba, Xi ChenAbstract:Representative strain plays an important role in indentation analysis; by using the representative strain and stress, the normalized indentation load becomes a function of one variable, which facilitates the reverse analysis of obtaining the material Plastic Properties. The accuracy of such function is critical to indentation analysis. Traditionally, polynomial functions are used to fit the function, which does not incorporate correct elastic/Plastic limits and has no physical basis. In this paper, we have proposed a new limit analysis-based functional formulation based on the theoretical solutions of conical/wedge indentation on elastic and rigid Plastic solids. It is found that both limits agree well with numerical results, and the new approach involves no—or at most one—fitting parameter, which can be obtained with much less effort compare with the traditional polynomial approach. Reverse analyses on five different materials have shown that the new and simple limit analysis-based formulation works better than the traditional polynomial fit. The new technique may be used to quickly and effectively measure material Plastic Properties for any conical indenter if the elastic modulus is known a priori.
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measuring the Plastic Properties of bulk materials by single indentation test
Scripta Materialia, 2006Co-Authors: Nagahisa Ogasawara, Norimasa Chiba, Xi ChenAbstract:We propose an improved technique to determine the Plastic Properties of a bulk material from the load–displacement curve from only one conical indentation test. This technique has been successfully applied to measure the Plastic Properties of several power-law materials, as well as to correctly identify different materials with the same load–displacement curves.
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A new approach to measure the elastic–Plastic Properties of bulk materials using spherical indentation
Acta Materialia, 2006Co-Authors: Manhong Zhao, Nagahisa Ogasawara, Norimasa Chiba, Xi ChenAbstract:Abstract Spherical indentation has the potential for measuring the elastic–Plastic Properties of a power-law hardening bulk specimen with just one simple test. In this paper, based on a new definition of representative strain, a set of dimensionless functions that relate the indentation characteristics and material Properties are established by means of extensive finite element analyses. A new numerical algorithm of reverse analysis is proposed to extract the elastic–Plastic Properties of bulk materials from one indentation test. This method is applicable to a wide range of power-law hardening materials. Good agreement is found between the material Properties obtained from the reverse analysis of the new approach and experimental data.
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a new approach to measure the elastic Plastic Properties of bulk materials using spherical indentation
Acta Materialia, 2006Co-Authors: Manhong Zhao, Nagahisa Ogasawara, Norimasa Chiba, Xi ChenAbstract:Abstract Spherical indentation has the potential for measuring the elastic–Plastic Properties of a power-law hardening bulk specimen with just one simple test. In this paper, based on a new definition of representative strain, a set of dimensionless functions that relate the indentation characteristics and material Properties are established by means of extensive finite element analyses. A new numerical algorithm of reverse analysis is proposed to extract the elastic–Plastic Properties of bulk materials from one indentation test. This method is applicable to a wide range of power-law hardening materials. Good agreement is found between the material Properties obtained from the reverse analysis of the new approach and experimental data.
Sujuan Wang - One of the best experts on this subject based on the ideXlab platform.
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tool rake angle selection in micro machining of 45 vol sicp 2024al based on its brittle Plastic Properties
Journal of Manufacturing Processes, 2019Co-Authors: Sujuan Wang, W J ZongAbstract:Abstract The influence of brittle and Plastic Properties of 45% volume fraction silicon carbide particle reinforced aluminum matrix composites (45 vol.% SiCp/2024Al) on machining are first taken into account in this work. Considering the coexistence of brittle and Plastic Properties, a novel micro-machining process is specially proposed for this material to suppress the shedding of SiC particles with a polycrystalline diamond tool, which requires a suitable negative rake angle. As expected, the unwanted materials accumulate ahead of tool cutting edge to form the chips and are finally removed under the compressive stress. In this case, the SiC particles are frequently pressed into the machined surface, so the number of shedding particles reduces considerably. As a result, the finished surface roughness is improved, and the tool wear is also suppressed effectively. However, a larger negative rake angle induces an excessive cutting force but decreases the stability of machine system, which in return speeds up tool wear and produces a higher surface roughness Sa. Turning experiments show that the smallest surface roughness Sa is achieved when tool rake angle is −30°. Moreover, the wear volume of the −30° rake angle tool is only 1/22 times the 0° rake angle tool.
