Load transfer in a composite containing a broken fiber with imperfect bonding

1990 ◽  
Vol 10 (3) ◽  
pp. 161-172 ◽  
Author(s):  
Yi-Chao Chen ◽  
Chung-Yuen Hui
Keyword(s):  
Load Transfer ◽  
Imperfect Bonding

On the Importance of Displacement History in Soft-Body Contact Models

2015 ◽  
Vol 11 (4) ◽  
Author(s):  
Jonathan Fleischmann ◽  
Radu Serban ◽  
Dan Negrut ◽  
Paramsothy Jayakumar
Keyword(s):  
Frictional Contact ◽  
Local Deformation ◽  
Friction Model ◽  
Direct Shear ◽  
Nonpenetration Condition ◽  
Time Step ◽  
Tangential Contact ◽  
Direct Shear Tests ◽  
Contact Models ◽  
Contact Displacement

Two approaches are commonly used for handling frictional contact within the framework of the discrete element method (DEM). One relies on the complementarity method (CM) to enforce a nonpenetration condition and the Coulomb dry-friction model at the interface between two bodies in mutual contact. The second approach, called the penalty method (PM), invokes an elasticity argument to produce a frictional contact force that factors in the local deformation and relative motion of the bodies in contact. We give a brief presentation of a DEM-PM contact model that includes multi-time-step tangential contact displacement history. We show that its implementation in an open-source simulation capability called Chrono is capable of accurately reproducing results from physical tests typical of the field of geomechanics, i.e., direct shear tests on a monodisperse material. Keeping track of the tangential contact displacement history emerges as a key element of the model. We show that identical simulations using contact models that include either no tangential contact displacement history or only single-time-step tangential contact displacement history are unable to accurately model the direct shear test.

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