Rate Sensitive Continuum Damage Models and Mesh Dependence in Finite Element Analyses
The experiences from orthogonal machining simulations show that the Johnson-Cook (JC) dynamic failure model exhibits significant element size dependence. Such mesh dependence is a direct consequence of the utilization of local damage models. The current contribution is an investigation of the extent...
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| Format: | Article |
| Language: | English |
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Wiley
2014-01-01
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| Series: | The Scientific World Journal |
| Online Access: | http://dx.doi.org/10.1155/2014/260571 |
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| author | Goran Ljustina Martin Fagerström Ragnar Larsson |
| author_facet | Goran Ljustina Martin Fagerström Ragnar Larsson |
| author_sort | Goran Ljustina |
| collection | DOAJ |
| description | The experiences from orthogonal machining simulations show that the Johnson-Cook (JC) dynamic failure model exhibits significant element size dependence. Such mesh dependence is a direct consequence of the utilization of local damage models. The current contribution is an investigation of the extent of the possible pathological mesh dependence. A comparison of the resulting JC model behavior combined with two types of damage evolution is considered. The first damage model is the JC dynamic failure model, where the development of the “damage” does not affect the response until the critical state is reached. The second one is a continuum damage model, where the damage variable is affecting the material response continuously during the deformation. Both the plasticity and the damage models are rate dependent, and the damage evolutions for both models are defined as a postprocessing of the effective stress response. The investigation is conducted for a series of 2D shear tests utilizing different FE representations of the plane strain plate with pearlite material properties. The results show for both damage models, using realistic pearlite material parameters, that similar extent of the mesh dependence is obtained and that the possible viscous regularization effects are absent in the current investigation. |
| format | Article |
| id | doaj-art-7b01301004924927824e3a5a0f6634b2 |
| institution | Kabale University |
| issn | 2356-6140 1537-744X |
| language | English |
| publishDate | 2014-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | The Scientific World Journal |
| spelling | doaj-art-7b01301004924927824e3a5a0f6634b22025-02-03T01:31:30ZengWileyThe Scientific World Journal2356-61401537-744X2014-01-01201410.1155/2014/260571260571Rate Sensitive Continuum Damage Models and Mesh Dependence in Finite Element AnalysesGoran Ljustina0Martin Fagerström1Ragnar Larsson2Division of Material and Computational Mechanics, Department of Applied Mechanics, Chalmers University of Technology, 412 96 Gothenburg, SwedenDivision of Material and Computational Mechanics, Department of Applied Mechanics, Chalmers University of Technology, 412 96 Gothenburg, SwedenDivision of Material and Computational Mechanics, Department of Applied Mechanics, Chalmers University of Technology, 412 96 Gothenburg, SwedenThe experiences from orthogonal machining simulations show that the Johnson-Cook (JC) dynamic failure model exhibits significant element size dependence. Such mesh dependence is a direct consequence of the utilization of local damage models. The current contribution is an investigation of the extent of the possible pathological mesh dependence. A comparison of the resulting JC model behavior combined with two types of damage evolution is considered. The first damage model is the JC dynamic failure model, where the development of the “damage” does not affect the response until the critical state is reached. The second one is a continuum damage model, where the damage variable is affecting the material response continuously during the deformation. Both the plasticity and the damage models are rate dependent, and the damage evolutions for both models are defined as a postprocessing of the effective stress response. The investigation is conducted for a series of 2D shear tests utilizing different FE representations of the plane strain plate with pearlite material properties. The results show for both damage models, using realistic pearlite material parameters, that similar extent of the mesh dependence is obtained and that the possible viscous regularization effects are absent in the current investigation.http://dx.doi.org/10.1155/2014/260571 |
| spellingShingle | Goran Ljustina Martin Fagerström Ragnar Larsson Rate Sensitive Continuum Damage Models and Mesh Dependence in Finite Element Analyses The Scientific World Journal |
| title | Rate Sensitive Continuum Damage Models and Mesh Dependence in Finite Element Analyses |
| title_full | Rate Sensitive Continuum Damage Models and Mesh Dependence in Finite Element Analyses |
| title_fullStr | Rate Sensitive Continuum Damage Models and Mesh Dependence in Finite Element Analyses |
| title_full_unstemmed | Rate Sensitive Continuum Damage Models and Mesh Dependence in Finite Element Analyses |
| title_short | Rate Sensitive Continuum Damage Models and Mesh Dependence in Finite Element Analyses |
| title_sort | rate sensitive continuum damage models and mesh dependence in finite element analyses |
| url | http://dx.doi.org/10.1155/2014/260571 |
| work_keys_str_mv | AT goranljustina ratesensitivecontinuumdamagemodelsandmeshdependenceinfiniteelementanalyses AT martinfagerstrom ratesensitivecontinuumdamagemodelsandmeshdependenceinfiniteelementanalyses AT ragnarlarsson ratesensitivecontinuumdamagemodelsandmeshdependenceinfiniteelementanalyses |