masterThesis
Contribuição ao estudo de treliças não lineares considerando efeitos térmicos
Fecha
2016-03-11Registro en:
CAVALCANTE, João Paulo de Barros. Contribuição ao estudo de treliças não lineares considerando efeitos térmicos. 2016. 39128f. Dissertação (Mestrado em Engenharia Civil) - Centro de Tecnologia, Universidade Federal do Rio Grande do Norte, Natal, 2016.
Autor
Cavalcante, João Paulo de Barros
Resumen
This work presents the numerical analysis of nonlinear trusses summited to
thermomechanical actions with Finite Element Method (FEM). The proposed
formulation is so-called positional FEM and it is based on the minimum potential energy
theorem written according to nodal positions, instead of displacements. The study
herein presented considers the effects of geometric and material nonlinearities.
Related to dynamic problems, a comparison between different time integration
algorithms is performed. The formulation is extended to impact problems between
trusses and rigid wall, where the nodal positions are constrained considering nullpenetration
condition. In addition, it is presented a thermodynamically consistent formulation, based on the first and second law of thermodynamics and the Helmholtz free-energy for analyzing dynamic problems of truss structures with thermoelastic and thermoplastic behavior. The numerical results of the proposed formulation are compared with examples found in the literature.