Dear all, I am trying to simulate or get the shape of Dugdale plastic Zone for a growing crack near the vicinity of the crack tip. I am able to get enough information about static crack but I fail to apply the same for dynamic or non static cracks please help me in regarding this.
Dugdale model is based on the mechanical properties of materials, in its simple form is if formulated in term of the yield stress, it is similar to a non hardening material elastoplastic behavior, when using a cohesive element based on the Dugdale model the stress in the cohesive element is equal to the yield stress of the material (or at least the yield stress of the zone near the tip of your crack (the process zone)) and that for a finit value of the applied load, the openning of the crack at its tip or along the cohesive zone varie till it reachs a critical value Delta_c which is a material parameter, then the element fails (and a new crack of a certain length appear). this model works well for the case of quasi-static crack propagation. this famous simple but robuste model is well used in Fracture mechanics both analytical and numerical, it has been widly develepped since Dugdale release it. In order to use it in the case of Dynamic problem you have to use a newly developed Dugdale models, you can refer to the studies of Mikhailov about time dependant cohesive model http://www.iaeng.org/publication/WCE2013/WCE2013_pp226-231.pdf
This thesis may be helpfull:
http://bura.brunel.ac.uk/bitstream/2438/8556/1/FulltextThesis.pdf
- Badges
- Science topic