Session: MSNDC-03-01 Contact and Interface Dynamics

Paper Number: 67417

Start Time: August 17, 01:00 PM

67417 - Reduced Isogeometric Analysis Models for Impact Simulations 

Detailed impact simulations in flexible multibody systems are usually based on isoparametric finite element models. For modeling the dynamics of an impact, a precise representation of the geometry is essential. However, isoparametric finite elements involve the discretization of the geometry.

This work tests the isogeometric analysis (IGA) as an alternative approach in flexible multibody systems. The IGA enables the exact representation of the geometry by using non-uniform rational basis splines (NURBS) as element shape functions. In the context of an efficient impact simulation a model reduction and a possible inclusion of the floating frame of reference formulation is beneficial. The degrees of freedom of the flexible bodies are reduced using component mode synthesis to save computation time in the multibody simulation. For the precise description of deformations and stresses in the contact area as well as elastodynamic effects, a large number of global shape functions is required.

As a first testing example, the impact of two elastic spheres is simulated. The second test example consists of a multibody multicontact problem including wave propagation in a long elastic rod. In both test cases, a reduced isogeometric finite element model and a full isoparametric finite element model are compared with a reference solution.

Presenting Author: Tobias Rückwald Institute of Mechanics and Ocean Engineering - Hamburg University of Technology

Authors:

Tobias Rückwald Hamburg University of Technology
Alexander Held Hamburg University of Technology
Robert Seifried Hamburg University of Technology