Acceleration of contact detection between arbitrarily shaped polyhedra based on multi-cover methods in three dimensional discontinuous deformation analysis

2020 ◽  
Vol 132 ◽  
pp. 104387
Author(s):  
Xi Wang ◽  
Wei Wu ◽  
Hehua Zhu ◽  
Jeen-Shang Lin ◽  
Hong Zhang
Keyword(s):  
Three Dimensional ◽  
Discontinuous Deformation Analysis ◽  
Deformation Analysis ◽  
Contact Detection ◽  
Discontinuous Deformation

NEW CONTACT-DEFINITION ALGORITHM USING INSCRIBED SPHERES FOR 3D DISCONTINUOUS DEFORMATION ANALYSIS

2011 ◽  
Vol 08 (02) ◽  
pp. 171-191 ◽  
Author(s):  
TAE-YOUNG AHN ◽  
JAE-JOON SONG
Keyword(s):  
Three Dimensional ◽  
Discontinuous Deformation Analysis ◽  
Deformation Analysis ◽  
Small Displacement ◽  
Contact Detection ◽  
Equilibrium Equations ◽  
Suggested Algorithm ◽  
Sphere Size ◽  
Discontinuous Deformation ◽  
Definition Of

The speed and stability of three-dimensional (3D) discontinuous deformation analysis (DDA) are strongly dependent on the efficiency and correctness of contact detection and the definition algorithm, which affects the simultaneous equilibrium equations solved in every open–close iteration (OCI) retry. In particular, the definition of vertex-to-vertex contacts in a tangled zone may abruptly change the entrance planes, even in the case of very small displacement of the objects. This study proposes a new contact-definition algorithm using an inscribed sphere virtually installed in every contacting vertex. The suggested algorithm generates virtual entrance planes in the case of a vertex-to-vertex contact, and controls the accuracy of the contact definition process by adjusting the sphere size. Verification tests of the proposed algorithm indicate an increase in the efficiency and stability of 3D DDA.

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