PSI - Issue 5

Jan Raška et al. / Procedia Structural Integrity 5 (2017) 225–232 Author name / Structural Integrity Procedia 00 (2017) 000 – 000

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2. Crack modeling and CRAC2D element implementation

The substance of the crack modeling, applied on the plate and shell structures (basic FE modeling, without use of XFEM method) , is the separation of the neighboring elements on the crack path. The FE model must be adapted so, that the crack path pass on the element borders. In the reality, the “element separation” consist in the creation of the new node row, coincident with the nodes in the crack path. One of the node row (original or new) is used for the left side border elements, the other node row is used for the right side border elements (see figure 2 and 3). This is the inverse operation of the merging and this operation is easy to do by the help of current commercial FEM pre- postprocessors.

Crack 1

Fig. 2. Crack modeling – preprocessor view.

Fig. 3. CRAC2D implementation – scheme.