Prediction of crack propagation direction for holes under quasi-static loading
The simulation of crack propagation relies on accurate computing of stress intensity factors (SIFs) at crack tips. Numerical methods are used to calculate the crack propagation path based on the computation of the crack incremental direction and stress intensity factors KI, KII from the finite eleme...
| Main Authors: | , , |
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| Format: | Conference or Workshop Item |
| Published: |
2007
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/4275/ http://eprints.uthm.edu.my/4275/1/16_CEM23%2DPrediction_Crack_Propagation..Zaleha_UKM_.pdf |
| Summary: | The simulation of crack propagation relies on accurate computing of stress
intensity factors (SIFs) at crack tips. Numerical methods are used to calculate the
crack propagation path based on the computation of the crack incremental
direction and stress intensity factors KI, KII from the finite element response. This
paper evaluates displacement extrapolation technique (DET) for prediction of
stress intensity factors. The DET is used when the singular element is present at
the crack tip and it uses the differential displacements for the adjacent nodes
across the crack to compute the stress intensity factors. The crack path and its
stress intensity factors are calculated in a specialized finite element program,
using small crack increments. At each crack propagation step, the mesh is
automatically redefined based on automatic adaptive strategy that takes into
account the estimation of stress analysis in two-dimension. The crack is free to
propagates without predetermine path direction. Maximum circumferential stress
criterion is used as the direction criterion. Some examples are presented to show
the results of the implementation. |
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