Elasto-plastic material parameter identification by inverse methods: Sensitivity matrix calculation

Steven Cooreman; Chantal Bouffioux; David Lecompte; Dimitri Debruyne; Hugo Sol; John Vantomme

Elasto-plastic material parameter identification by inverse methods: Sensitivity matrix calculation

Steven Cooreman, Chantal Bouffioux, David Lecompte, Dimitri Debruyne, Hugo Sol, John Vantomme

Structural and Blast Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

Inverse methods offer a powerful tool for the determination of the elasto-plastic material properties. Contrary to standard tests, these methods can deal with heterogeneous stress and strain-fields which have a larger information contents and hence allow the simultaneous identification of several material parameters. Moreover, it is expected that the obtained material parameters are more accurate, since these heterogeneous deformation fields are much closer to those occurring in real (metal) forming operations. The principle of the inverse method for the identification of material parameters presented in this paper is to compare an experimentally measured strain field to that computed by a Finite Element (FE) model. The material parameters in the FE model are iteratively tuned in such a way that both strain fields match each other as close as possible. One of the building blocks in this identification procedure is the updating algorithm for the material parameters in the FE model. The key problem of this updating algorithm is the determination of the sensitivity matrix, which expresses the sensitivities of the strains with respect to the material parameters. This paper presents an analytical method for the calculation of this sensitivity matrix in case of simple tensile tests.

Original language	English
Title of host publication	Proceedings of the 2006 SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006
Pages	987-1000
Number of pages	14
Publication status	Published - 2006
Event	SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006 - Saint Louis, MO, United States Duration: 4 Jun 2006 → 7 Jun 2006

Publication series

Name	Proceedings of the 2006 SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006
Volume	2

Conference

Conference	SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006
Country/Territory	United States
City	Saint Louis, MO
Period	4/06/06 → 7/06/06

Keywords

Elasto-plastic material properties
FEM
Heterogeneous fields
Inverse methods
Sensitivity matrix

Cite this

Cooreman, S., Bouffioux, C., Lecompte, D., Debruyne, D., Sol, H., & Vantomme, J. (2006). Elasto-plastic material parameter identification by inverse methods: Sensitivity matrix calculation. In Proceedings of the 2006 SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006 (pp. 987-1000). (Proceedings of the 2006 SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006; Vol. 2).

Cooreman, Steven ; Bouffioux, Chantal ; Lecompte, David et al. / Elasto-plastic material parameter identification by inverse methods : Sensitivity matrix calculation. Proceedings of the 2006 SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006. 2006. pp. 987-1000 (Proceedings of the 2006 SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006).

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title = "Elasto-plastic material parameter identification by inverse methods: Sensitivity matrix calculation",

abstract = "Inverse methods offer a powerful tool for the determination of the elasto-plastic material properties. Contrary to standard tests, these methods can deal with heterogeneous stress and strain-fields which have a larger information contents and hence allow the simultaneous identification of several material parameters. Moreover, it is expected that the obtained material parameters are more accurate, since these heterogeneous deformation fields are much closer to those occurring in real (metal) forming operations. The principle of the inverse method for the identification of material parameters presented in this paper is to compare an experimentally measured strain field to that computed by a Finite Element (FE) model. The material parameters in the FE model are iteratively tuned in such a way that both strain fields match each other as close as possible. One of the building blocks in this identification procedure is the updating algorithm for the material parameters in the FE model. The key problem of this updating algorithm is the determination of the sensitivity matrix, which expresses the sensitivities of the strains with respect to the material parameters. This paper presents an analytical method for the calculation of this sensitivity matrix in case of simple tensile tests.",

keywords = "Elasto-plastic material properties, FEM, Heterogeneous fields, Inverse methods, Sensitivity matrix",

author = "Steven Cooreman and Chantal Bouffioux and David Lecompte and Dimitri Debruyne and Hugo Sol and John Vantomme",

year = "2006",

language = "English",

isbn = "091205395X",

series = "Proceedings of the 2006 SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006",

pages = "987--1000",

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note = "SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006 ; Conference date: 04-06-2006 Through 07-06-2006",

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Cooreman, S, Bouffioux, C, Lecompte, D, Debruyne, D, Sol, H & Vantomme, J 2006, Elasto-plastic material parameter identification by inverse methods: Sensitivity matrix calculation. in Proceedings of the 2006 SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006. Proceedings of the 2006 SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006, vol. 2, pp. 987-1000, SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006, Saint Louis, MO, United States, 4/06/06.

Elasto-plastic material parameter identification by inverse methods: Sensitivity matrix calculation. / Cooreman, Steven; Bouffioux, Chantal; Lecompte, David et al.
Proceedings of the 2006 SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006. 2006. p. 987-1000 (Proceedings of the 2006 SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006; Vol. 2).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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AU - Sol, Hugo

AU - Vantomme, John

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AB - Inverse methods offer a powerful tool for the determination of the elasto-plastic material properties. Contrary to standard tests, these methods can deal with heterogeneous stress and strain-fields which have a larger information contents and hence allow the simultaneous identification of several material parameters. Moreover, it is expected that the obtained material parameters are more accurate, since these heterogeneous deformation fields are much closer to those occurring in real (metal) forming operations. The principle of the inverse method for the identification of material parameters presented in this paper is to compare an experimentally measured strain field to that computed by a Finite Element (FE) model. The material parameters in the FE model are iteratively tuned in such a way that both strain fields match each other as close as possible. One of the building blocks in this identification procedure is the updating algorithm for the material parameters in the FE model. The key problem of this updating algorithm is the determination of the sensitivity matrix, which expresses the sensitivities of the strains with respect to the material parameters. This paper presents an analytical method for the calculation of this sensitivity matrix in case of simple tensile tests.

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Cooreman S, Bouffioux C, Lecompte D, Debruyne D, Sol H, Vantomme J. Elasto-plastic material parameter identification by inverse methods: Sensitivity matrix calculation. In Proceedings of the 2006 SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006. 2006. p. 987-1000. (Proceedings of the 2006 SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006).

Elasto-plastic material parameter identification by inverse methods: Sensitivity matrix calculation

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Keywords

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