Method for Estimating Normal Contact Parameters in Collision Modeling Using Discontinuous Deformation Analysis
Publication: International Journal of Geomechanics
Volume 17, Issue 5
Abstract
This paper presents a contact parameter estimation method for collision modeling using discontinuous deformation analysis (DDA). Most DDA codes and discrete element method (DEM) codes use the viscoelastic contact model for contact-stress calculation. The contact parameters of the viscoelastic contact model, such as normal stiffness and damping constant, affect the computation results observably. Although the DDA method has been proposed for more than 20 years, the contact parameters in DDA modeling are still difficult to determine. In collision dynamics, the coefficient of restitution (COR) is considered the critical parameter for describing the changes of motion state after collision between two objects. In the proposed method, the normal COR is used for evaluating calculation results of rockfall modeling with three-dimensional DDA. The normal COR of the two-object model is obtained by tests or empirical methods. The relation curve of contact parameters and the normal COR is generated on the basis of a series of numerical computations according to the tests. Then, the reasonable combination of normal stiffness and damping constant can be calculated by matching the normal COR on this curve and used in other similar computations to obtain more practical results. An example based on laboratory tests is reported to validate the method.
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Acknowledgments
The authors gratefully acknowledge support from the Key Programme from Natural Science Foundation of China (Grant 41130751), the Ministry of Science and Technology of China (Grant SLDRCE 14-A-09), the research Programme for Western China Communication (Grant 2011ZB04), the Program for Changjiang Scholars and Innovative Research Team in University (Grant IRT1029), and the Shanghai Chenguang Program (Grant 12CG20).
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Published In
International Journal of Geomechanics
Volume 17 • Issue 5 • May 2017
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Aug 13, 2015
Accepted: May 27, 2016
Published online: Jul 29, 2016
Discussion open until: Dec 29, 2016
Published in print: May 1, 2017
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