Improvement of open-close iteration in DDA

Research output: Contribution to conferencePaper

6 Citations (Scopus)

Abstract

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
Pages185-191
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

Other

Other11th International Conference on Analysis of Discontinuous Deformation, ICADD 2013
CountryJapan
CityFukuoka
Period13-08-2713-08-29

Fingerprint

Digital differential analyzers
Iteration
Contact
Stress concentration
Stiffness
Cycle
Interval
Converge

All Science Journal Classification (ASJC) codes

  • Modelling and Simulation

Cite this

Wu, J. H., & Lin, H. M. (2013). Improvement of open-close iteration in DDA. 185-191. Paper presented at 11th International Conference on Analysis of Discontinuous Deformation, ICADD 2013, Fukuoka, Japan.
Wu, J. H. ; Lin, H. M. / Improvement of open-close iteration in DDA. Paper presented at 11th International Conference on Analysis of Discontinuous Deformation, ICADD 2013, Fukuoka, Japan.7 p.
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abstract = "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.",
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Wu, JH & Lin, HM 2013, 'Improvement of open-close iteration in DDA', Paper presented at 11th International Conference on Analysis of Discontinuous Deformation, ICADD 2013, Fukuoka, Japan, 13-08-27 - 13-08-29 pp. 185-191.

Improvement of open-close iteration in DDA. / Wu, J. H.; Lin, H. M.

2013. 185-191 Paper presented at 11th International Conference on Analysis of Discontinuous Deformation, ICADD 2013, Fukuoka, Japan.

Research output: Contribution to conferencePaper

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N2 - 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.

AB - 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.

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Wu JH, Lin HM. Improvement of open-close iteration in DDA. 2013. Paper presented at 11th International Conference on Analysis of Discontinuous Deformation, ICADD 2013, Fukuoka, Japan.