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Rate Sensitive Continuum Damage Models and Mesh Dependence in Finite Element Analyses

Goran Ljustina (Institutionen för tillämpad mekanik, Material- och beräkningsmekanik) ; Martin Fagerström (Institutionen för tillämpad mekanik, Material- och beräkningsmekanik) ; Ragnar Larsson (Institutionen för tillämpad mekanik, Material- och beräkningsmekanik)
Scientific World Journal (1537-744X). Vol. 2014 (2014),
[Artikel, refereegranskad vetenskaplig]

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 continuumdamagemodel, where the damage variable is affecting thematerial response continuously during the deformation. Both the plasticity and the damagemodels are rate dependent, and the damage evolutions for bothmodels 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.



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Denna post skapades 2014-11-04. Senast ändrad 2016-02-01.
CPL Pubid: 205238

 

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Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Material- och beräkningsmekanik (2005-2017)

Ämnesområden

Materialvetenskap
Produktion
Hållbar utveckling
Fastkroppsmekanik
Farkostteknik

Chalmers infrastruktur