The Experts below are selected from a list of 72087 Experts worldwide ranked by ideXlab platform
V. Fontanari - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of the stress–strain Curve of metallic materials by spherical indentation
International Journal of Solids and Structures, 2006Co-Authors: M. Beghini, L. Bertini, V. FontanariAbstract:AbstractA method for deducing the stress–strain uniaxial properties of metallic materials from instrumented spherical indentation is presented along with an experimental verification.An extensive finite element parametric analysis of the spherical indentation was performed in order to generate a database of load vs. depth of penetration Curves for classes of materials selected in order to represent the metals commonly employed in structural applications. The stress–strain Curves of the materials were represented with three parameters: the Young modulus for the elastic regime, the stress of proportionality limit and the strain-hardening coefficient for the elastic–plastic regime.The indentation Curves simulated by the finite element analyses were fitted in order to obtain a continuous function which can produce accurate load vs. depth Curves for any combination of the constitutive elastic–plastic parameters. On the basis of this continuous function, an optimization algorithm was then employed to deduce the material elastic–plastic parameters and the related stress–strain Curve when the measured load vs. depth Curve is available by an instrumented spherical indentation test.The proposed method was verified by comparing the predicted stress–strain Curves with those directly measured for several metallic alloys having different mechanical properties.This result confirms the possibility to deduce the complete stress–strain Curve of a metal alloy with good accuracy by a properly conducted instrumented spherical indentation test and a suitable interpretation technique of the measured quantities
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Evaluation of the Stress-Strain Curve of metallic materials by spherical indentation
International Journal of Solids and Structures, 2005Co-Authors: M. Beghini, L. Bertini, V. FontanariAbstract:Abstract A method for deducing the stress–strain uniaxial properties of metallic materials from instrumented spherical indentation is presented along with an experimental verification. An extensive finite element parametric analysis of the spherical indentation was performed in order to generate a database of load vs. depth of penetration Curves for classes of materials selected in order to represent the metals commonly employed in structural applications. The stress–strain Curves of the materials were represented with three parameters: the Young modulus for the elastic regime, the stress of proportionality limit and the strain-hardening coefficient for the elastic–plastic regime. The indentation Curves simulated by the finite element analyses were fitted in order to obtain a continuous function which can produce accurate load vs. depth Curves for any combination of the constitutive elastic–plastic parameters. On the basis of this continuous function, an optimization algorithm was then employed to deduce the material elastic–plastic parameters and the related stress–strain Curve when the measured load vs. depth Curve is available by an instrumented spherical indentation test. The proposed method was verified by comparing the predicted stress–strain Curves with those directly measured for several metallic alloys having different mechanical properties. This result confirms the possibility to deduce the complete stress–strain Curve of a metal alloy with good accuracy by a properly conducted instrumented spherical indentation test and a suitable interpretation technique of the measured quantities.
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on the possibility to obtain the stress strain Curve for a strain hardening material by spherical indentation
Journal of Computer Applications in Technology, 2002Co-Authors: M. Beghini, L. Bertini, V. FontanariAbstract:A numerical approach aimed at evaluation the Stress-Strain Curve for metallic materials starting from the results of instrumented spherical indentation tests is presented. The spherical indentation for materials having different σ-e Curves was modelled by means of a parametric finite-elements analysis. It was studied as the shape of the indentation crater evolves with the load and it was verified that it depends on the strain-hardening and yield stress of the material. By means of an elaboration of these results, an iterative procedure was set up, which allows the σ-e Curve to be obtained with satisfactory accuracy for a large class of materials. The procedure was tested by interpreting a simulated indentation test on a typical structural steel, thus confirming its validity and accuracy.
M. Beghini - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of the stress–strain Curve of metallic materials by spherical indentation
International Journal of Solids and Structures, 2006Co-Authors: M. Beghini, L. Bertini, V. FontanariAbstract:AbstractA method for deducing the stress–strain uniaxial properties of metallic materials from instrumented spherical indentation is presented along with an experimental verification.An extensive finite element parametric analysis of the spherical indentation was performed in order to generate a database of load vs. depth of penetration Curves for classes of materials selected in order to represent the metals commonly employed in structural applications. The stress–strain Curves of the materials were represented with three parameters: the Young modulus for the elastic regime, the stress of proportionality limit and the strain-hardening coefficient for the elastic–plastic regime.The indentation Curves simulated by the finite element analyses were fitted in order to obtain a continuous function which can produce accurate load vs. depth Curves for any combination of the constitutive elastic–plastic parameters. On the basis of this continuous function, an optimization algorithm was then employed to deduce the material elastic–plastic parameters and the related stress–strain Curve when the measured load vs. depth Curve is available by an instrumented spherical indentation test.The proposed method was verified by comparing the predicted stress–strain Curves with those directly measured for several metallic alloys having different mechanical properties.This result confirms the possibility to deduce the complete stress–strain Curve of a metal alloy with good accuracy by a properly conducted instrumented spherical indentation test and a suitable interpretation technique of the measured quantities
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Evaluation of the Stress-Strain Curve of metallic materials by spherical indentation
International Journal of Solids and Structures, 2005Co-Authors: M. Beghini, L. Bertini, V. FontanariAbstract:Abstract A method for deducing the stress–strain uniaxial properties of metallic materials from instrumented spherical indentation is presented along with an experimental verification. An extensive finite element parametric analysis of the spherical indentation was performed in order to generate a database of load vs. depth of penetration Curves for classes of materials selected in order to represent the metals commonly employed in structural applications. The stress–strain Curves of the materials were represented with three parameters: the Young modulus for the elastic regime, the stress of proportionality limit and the strain-hardening coefficient for the elastic–plastic regime. The indentation Curves simulated by the finite element analyses were fitted in order to obtain a continuous function which can produce accurate load vs. depth Curves for any combination of the constitutive elastic–plastic parameters. On the basis of this continuous function, an optimization algorithm was then employed to deduce the material elastic–plastic parameters and the related stress–strain Curve when the measured load vs. depth Curve is available by an instrumented spherical indentation test. The proposed method was verified by comparing the predicted stress–strain Curves with those directly measured for several metallic alloys having different mechanical properties. This result confirms the possibility to deduce the complete stress–strain Curve of a metal alloy with good accuracy by a properly conducted instrumented spherical indentation test and a suitable interpretation technique of the measured quantities.
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on the possibility to obtain the stress strain Curve for a strain hardening material by spherical indentation
Journal of Computer Applications in Technology, 2002Co-Authors: M. Beghini, L. Bertini, V. FontanariAbstract:A numerical approach aimed at evaluation the Stress-Strain Curve for metallic materials starting from the results of instrumented spherical indentation tests is presented. The spherical indentation for materials having different σ-e Curves was modelled by means of a parametric finite-elements analysis. It was studied as the shape of the indentation crater evolves with the load and it was verified that it depends on the strain-hardening and yield stress of the material. By means of an elaboration of these results, an iterative procedure was set up, which allows the σ-e Curve to be obtained with satisfactory accuracy for a large class of materials. The procedure was tested by interpreting a simulated indentation test on a typical structural steel, thus confirming its validity and accuracy.
Philippe Pilvin - One of the best experts on this subject based on the ideXlab platform.
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Experimental evaluation of the Stress-Strain Curve by continuous indentation using different indenter shapes
Materials Science and Engineering: A, 2009Co-Authors: Jean-marc Collin, Gérard Mauvoisin, Olivier Bartier, Rochdi El Abdi, Philippe PilvinAbstract:Experimental applications of the methodology developed for spherical indentation are proposed in this paper. Two quasi-spherical indenters with different shapes were used in order to evaluate the stress–strain Curve of five steels. Although the shape of the indenter was not perfectly spherical, it was shown that models developed for spherical indentation can be used with an adequate correction. The results are in good agreement with those obtained by tensile tests. Moreover, the case of the austenitic alloy (AISI 316L) revealed the importance of sample preparation for the experimental results.
L. Bertini - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of the stress–strain Curve of metallic materials by spherical indentation
International Journal of Solids and Structures, 2006Co-Authors: M. Beghini, L. Bertini, V. FontanariAbstract:AbstractA method for deducing the stress–strain uniaxial properties of metallic materials from instrumented spherical indentation is presented along with an experimental verification.An extensive finite element parametric analysis of the spherical indentation was performed in order to generate a database of load vs. depth of penetration Curves for classes of materials selected in order to represent the metals commonly employed in structural applications. The stress–strain Curves of the materials were represented with three parameters: the Young modulus for the elastic regime, the stress of proportionality limit and the strain-hardening coefficient for the elastic–plastic regime.The indentation Curves simulated by the finite element analyses were fitted in order to obtain a continuous function which can produce accurate load vs. depth Curves for any combination of the constitutive elastic–plastic parameters. On the basis of this continuous function, an optimization algorithm was then employed to deduce the material elastic–plastic parameters and the related stress–strain Curve when the measured load vs. depth Curve is available by an instrumented spherical indentation test.The proposed method was verified by comparing the predicted stress–strain Curves with those directly measured for several metallic alloys having different mechanical properties.This result confirms the possibility to deduce the complete stress–strain Curve of a metal alloy with good accuracy by a properly conducted instrumented spherical indentation test and a suitable interpretation technique of the measured quantities
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Evaluation of the Stress-Strain Curve of metallic materials by spherical indentation
International Journal of Solids and Structures, 2005Co-Authors: M. Beghini, L. Bertini, V. FontanariAbstract:Abstract A method for deducing the stress–strain uniaxial properties of metallic materials from instrumented spherical indentation is presented along with an experimental verification. An extensive finite element parametric analysis of the spherical indentation was performed in order to generate a database of load vs. depth of penetration Curves for classes of materials selected in order to represent the metals commonly employed in structural applications. The stress–strain Curves of the materials were represented with three parameters: the Young modulus for the elastic regime, the stress of proportionality limit and the strain-hardening coefficient for the elastic–plastic regime. The indentation Curves simulated by the finite element analyses were fitted in order to obtain a continuous function which can produce accurate load vs. depth Curves for any combination of the constitutive elastic–plastic parameters. On the basis of this continuous function, an optimization algorithm was then employed to deduce the material elastic–plastic parameters and the related stress–strain Curve when the measured load vs. depth Curve is available by an instrumented spherical indentation test. The proposed method was verified by comparing the predicted stress–strain Curves with those directly measured for several metallic alloys having different mechanical properties. This result confirms the possibility to deduce the complete stress–strain Curve of a metal alloy with good accuracy by a properly conducted instrumented spherical indentation test and a suitable interpretation technique of the measured quantities.
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on the possibility to obtain the stress strain Curve for a strain hardening material by spherical indentation
Journal of Computer Applications in Technology, 2002Co-Authors: M. Beghini, L. Bertini, V. FontanariAbstract:A numerical approach aimed at evaluation the Stress-Strain Curve for metallic materials starting from the results of instrumented spherical indentation tests is presented. The spherical indentation for materials having different σ-e Curves was modelled by means of a parametric finite-elements analysis. It was studied as the shape of the indentation crater evolves with the load and it was verified that it depends on the strain-hardening and yield stress of the material. By means of an elaboration of these results, an iterative procedure was set up, which allows the σ-e Curve to be obtained with satisfactory accuracy for a large class of materials. The procedure was tested by interpreting a simulated indentation test on a typical structural steel, thus confirming its validity and accuracy.
Jean-marc Collin - One of the best experts on this subject based on the ideXlab platform.
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Experimental evaluation of the Stress-Strain Curve by continuous indentation using different indenter shapes
Materials Science and Engineering: A, 2009Co-Authors: Jean-marc Collin, Gérard Mauvoisin, Olivier Bartier, Rochdi El Abdi, Philippe PilvinAbstract:Experimental applications of the methodology developed for spherical indentation are proposed in this paper. Two quasi-spherical indenters with different shapes were used in order to evaluate the stress–strain Curve of five steels. Although the shape of the indenter was not perfectly spherical, it was shown that models developed for spherical indentation can be used with an adequate correction. The results are in good agreement with those obtained by tensile tests. Moreover, the case of the austenitic alloy (AISI 316L) revealed the importance of sample preparation for the experimental results.