Details
| Original language | English |
|---|---|
| Article number | E4016011 |
| Journal | International Journal of Geomechanics |
| Volume | 17 |
| Issue number | 5 |
| Publication status | Published - 1 May 2017 |
| Externally published | Yes |
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.
Keywords
- Coefficients of restitution, Collision modeling, Contact parameter, Discontinuous deformation analysis, Rockfall
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)
- Soil Science
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In: International Journal of Geomechanics, Vol. 17, No. 5, E4016011, 01.05.2017.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Method for estimating normal contact parameters in collision modeling using discontinuous deformation analysis
AU - Zhu, Hehua
AU - Wu, Wei
AU - Zhuang, Xiaoying
AU - Cai, Yongchang
AU - Rabczuk, Timon
N1 - Funding information: 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).
PY - 2017/5/1
Y1 - 2017/5/1
N2 - 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.
AB - 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.
KW - Coefficients of restitution
KW - Collision modeling
KW - Contact parameter
KW - Discontinuous deformation analysis
KW - Rockfall
UR - http://www.scopus.com/inward/record.url?scp=85016469229&partnerID=8YFLogxK
U2 - 10.1061/(asce)gm.1943-5622.0000745
DO - 10.1061/(asce)gm.1943-5622.0000745
M3 - Article
AN - SCOPUS:85016469229
VL - 17
JO - International Journal of Geomechanics
JF - International Journal of Geomechanics
SN - 1532-3641
IS - 5
M1 - E4016011
ER -