Improvement of open-close iteration in DDA

Research output: Contribution to conferencePaperpeer-review

10 Citations (Scopus)


This paper corrects Open-Close Iteration for the convergence of block contacts in DDA. In conventional open-close iteration, each contact pattern converges at Time Step n when the contact pattern at Iteration i is the same as the one at previous iteration of i - 1. When the number of iteration equals to 6, but the contact pattern is not converged, the time interval decreases, and a new iteration cycle is performed. At the Iteration 1 of the new iteration cycle, the previous contact pattern is defined as that at Iteration 5 in the old iteration cycle, which may be different from the contact pattern at the end of Step n - 1. As the number of block in DDA increases, the contacts are difficult to converge. The time interval changes significantly and unexpectedly when calculating the stress distribution of a blocky assembly. Therefore, we improved the open-close iteration that the contact information at the end of previous step, Step n - 1, is reloaded as the previous iteration when the iteration is 1 in the new iteration cycle. With the new open-close iteration algorithm, the time interval for the blocky assembly calculations can be expected. This is the first step to investigate the appropriate time interval or contact spring stiffness for DDA in the future.

Original languageEnglish
Number of pages7
Publication statusPublished - 2013 Oct 1
Event11th International Conference on Analysis of Discontinuous Deformation, ICADD 2013 - Fukuoka, Japan
Duration: 2013 Aug 272013 Aug 29


Other11th International Conference on Analysis of Discontinuous Deformation, ICADD 2013

All Science Journal Classification (ASJC) codes

  • Modelling and Simulation


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