A consistency assessment of coupled cohesive zone models for mixed-mode debonding problems
Due to their simplicity, cohesive zone models (CZMs) are very attractive to describe mixed-mode failure and debonding processes of materials and interfaces. Although a large number of coupled CZMs have been proposed, and despite the extensive related literature, little attention has been devoted t...
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Gruppo Italiano Frattura
2014-07-01
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| Series: | Fracture and Structural Integrity |
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| Online Access: | http://www.gruppofrattura.it/pdf/rivista/numero29/numero_29_art_23.pdf |
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| author | R. Dimitri M. Trullo G. Zavarise L. De Lorenzis |
| author_facet | R. Dimitri M. Trullo G. Zavarise L. De Lorenzis |
| author_sort | R. Dimitri |
| collection | DOAJ |
| description | Due to their simplicity, cohesive zone models (CZMs) are very attractive to describe mixed-mode
failure and debonding processes of materials and interfaces. Although a large number of coupled CZMs have
been proposed, and despite the extensive related literature, little attention has been devoted to ensuring the
consistency of these models for mixed-mode conditions, primarily in a thermodynamical sense. A lack of
consistency may affect the local or global response of a mechanical system. This contribution deals with the
consistency check for some widely used exponential and bilinear mixed-mode CZMs. The coupling effect on
stresses and energy dissipation is first investigated and the path-dependance of the mixed-mode debonding
work of separation is analitically evaluated. Analytical predictions are also compared with results from numerical
implementations, where the interface is described with zero-thickness contact elements. A node-to-segment
strategy is here adopted, which incorporates decohesion and contact within a unified framework. A new
thermodynamically consistent mixed-mode CZ model based on a reformulation of the Xu-Needleman model as
modified by van den Bosch et al. is finally proposed and derived by applying the Coleman and Noll procedure
in accordance with the second law of thermodynamics. The model holds monolithically for loading and
unloading processes, as well as for decohesion and contact, and its performance is demonstrated through
suitable examples. |
| format | Article |
| id | doaj-art-339e303076554839a172bbc9c9620d3f |
| institution | Kabale University |
| issn | 1971-8993 1971-8993 |
| language | English |
| publishDate | 2014-07-01 |
| publisher | Gruppo Italiano Frattura |
| record_format | Article |
| series | Fracture and Structural Integrity |
| spelling | doaj-art-339e303076554839a172bbc9c9620d3f2025-01-03T01:03:17ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89931971-89932014-07-0182926628310.3221/IGF-ESIS.29.23A consistency assessment of coupled cohesive zone models for mixed-mode debonding problemsR. Dimitri0M. Trullo1G. Zavarise2L. De Lorenzis3University of Salento, LecceUniversity of Salento, LecceUniversity of Salento, LecceTechnische Universität Braunschweig, GermanyDue to their simplicity, cohesive zone models (CZMs) are very attractive to describe mixed-mode failure and debonding processes of materials and interfaces. Although a large number of coupled CZMs have been proposed, and despite the extensive related literature, little attention has been devoted to ensuring the consistency of these models for mixed-mode conditions, primarily in a thermodynamical sense. A lack of consistency may affect the local or global response of a mechanical system. This contribution deals with the consistency check for some widely used exponential and bilinear mixed-mode CZMs. The coupling effect on stresses and energy dissipation is first investigated and the path-dependance of the mixed-mode debonding work of separation is analitically evaluated. Analytical predictions are also compared with results from numerical implementations, where the interface is described with zero-thickness contact elements. A node-to-segment strategy is here adopted, which incorporates decohesion and contact within a unified framework. A new thermodynamically consistent mixed-mode CZ model based on a reformulation of the Xu-Needleman model as modified by van den Bosch et al. is finally proposed and derived by applying the Coleman and Noll procedure in accordance with the second law of thermodynamics. The model holds monolithically for loading and unloading processes, as well as for decohesion and contact, and its performance is demonstrated through suitable examples.http://www.gruppofrattura.it/pdf/rivista/numero29/numero_29_art_23.pdfCohesive zone modeling; Contact; Debonding; Thermodynamics. |
| spellingShingle | R. Dimitri M. Trullo G. Zavarise L. De Lorenzis A consistency assessment of coupled cohesive zone models for mixed-mode debonding problems Fracture and Structural Integrity Cohesive zone modeling; Contact; Debonding; Thermodynamics. |
| title | A consistency assessment of coupled cohesive zone models for mixed-mode debonding problems |
| title_full | A consistency assessment of coupled cohesive zone models for mixed-mode debonding problems |
| title_fullStr | A consistency assessment of coupled cohesive zone models for mixed-mode debonding problems |
| title_full_unstemmed | A consistency assessment of coupled cohesive zone models for mixed-mode debonding problems |
| title_short | A consistency assessment of coupled cohesive zone models for mixed-mode debonding problems |
| title_sort | consistency assessment of coupled cohesive zone models for mixed mode debonding problems |
| topic | Cohesive zone modeling; Contact; Debonding; Thermodynamics. |
| url | http://www.gruppofrattura.it/pdf/rivista/numero29/numero_29_art_23.pdf |
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