Improvement of formulation of identification and solution of the bidimensional impact between structure and rigid wall / Aprimoramento de formulação de identificação e solução do impacto bidimensional entre estrutura e anteparo rígido

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

This work has as main goal the development of a formulation, based on the finite element method (FEM), for the identification and solution of the bidimensional nonlinear impact between reticulated cyclics structures and fixed rigid wall. The dynamic geometrically nonlinear behavior is treated with a positional formulation classified as total Lagrangean with exact kinematics. The time integrator of modified Newmark is used, to describe the dynamic behavior, to assure the stability in the analysis of the impact. An algorithm of identification of the occurrence of the impact was developed, using auxiliary segments that define a region formed for feasible points of impact. The solution of the impact is made with an algorithm of geometric return as curve surface with any approach for the rigid wall, considering situations with and without friction. A comparison between the technique adopted and Lagrange multipliers and penalty is made. Finally, general numerical examples are presented, where a study of convergence was made.

ASSUNTO(S)

método dos elementos finitos impact controle de posições não linearidade geométrica impacto finite element method position control geometric non linearity

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