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Does anyone have any idea how to model crack propagation using a damage model and reducing elements stiffness to zero?
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Hi,
The crack propogation analysis can be made using Finite elements using 2 models
1) Discrete Crack Model
2) Smeared Crack Model
In Discrete crack model u specify a crack propogation criterion in terms of starin energy release rates at the nodes of the elements. u presume that there is propogation of cracks all along the boundaries of elements between nodes.The main aspect from FE point of view is that how do u distribute ur stresses once a crack is formed.This again depends on the kind of materila behaviour.
In smeared crack model u assume that the failure is smeared over the entire element. This is advantageous to use when u have an adaptive FE -remeshing algorithm combined with the crack model. This gives good results for a suffciently refined mesh. The poropogation criterion being defined in terms of energy levels in the element.
Hope this helps
regds
Raj
The crack propogation analysis can be made using Finite elements using 2 models
1) Discrete Crack Model
2) Smeared Crack Model
In Discrete crack model u specify a crack propogation criterion in terms of starin energy release rates at the nodes of the elements. u presume that there is propogation of cracks all along the boundaries of elements between nodes.The main aspect from FE point of view is that how do u distribute ur stresses once a crack is formed.This again depends on the kind of materila behaviour.
In smeared crack model u assume that the failure is smeared over the entire element. This is advantageous to use when u have an adaptive FE -remeshing algorithm combined with the crack model. This gives good results for a suffciently refined mesh. The poropogation criterion being defined in terms of energy levels in the element.
Hope this helps
regds
Raj
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