Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: contact

Sortuj według:

Ogranicz wyniki do:

Three-dimensional flat shell-to-shell coupling: numerical challenges

100%

Guo K., Haikal G.

Curved and Layered Structures

2017

tom 4

nr 1

299-313

The node-to-surface formulation is widely used in contact simulations with finite elements because it is relatively easy to implement using different types of element discretizations. This approach, however, has a number of well-known drawbacks, including locking due to over-constraint when this formulation is used as a twopass method. Most studies on the node-to-surface contact formulation, however, have been conducted using solid elements and little has been done to investigate the effectiveness of this approach for beam or shell elements. In this paper we show that locking can also be observed with the node-to-surface contact formulation when applied to plate and flat shell elements even with a singlepass implementation with distinct master/slave designations, which is the standard solution to locking with solid elements. In our study, we use the quadrilateral four node flat shell element for thin (Kirchhoff-Love) plate and thick (Reissner-Mindlin) plate theory, both in their standard forms and with improved formulations such as the linked interpolation [1] and the Discrete Kirchhoff [2] elements for thick and thin plates, respectively. The Lagrange multiplier method is used to enforce the node-to-surface constraints for all elements. The results show clear locking when compared to those obtained using a conforming mesh configuration.

A general on-the-fly algorithm for modifying the kinematic tree hierarchy

75%

Stępień J., Polański A., Wojciechowski K.

International Journal of Applied Mathematics and Computer Science

2012

tom 22

nr 2

423-435

When conducting a dynamic simulation of a multibody mechanical system, the model definition may need to be altered during the simulation course due to, e.g., changes in the way the system interacts with external objects. In this paper, we propose a general procedure for modifying simulation models of articulated figures, particularly useful when dealing with systems in time-varying contact with the environment. The proposed algorithm adjusts model connectivity, geometry and current state, producing its equivalent ready to be used by the simulation procedure. Furthermore, we also provide a simple usage scenario-a passive planar biped walker.

Ograniczanie wyników

1 Curved and Layered Structures

1 International Journal of Applied Mathematics and Computer Science

1 Guo K.

1 Haikal G.

1 Polański A.

1 Stępień J.

1 Wojciechowski K.

1 2017

1 2012

Wyniki wyszukiwania

Three-dimensional flat shell-to-shell coupling: numerical challenges

A general on-the-fly algorithm for modifying the kinematic tree hierarchy